Jure's corner

Software "design"

It all started with me having too much free time at my workplace.

So I started researching about homebrew autopilots for model planes, that led me to software that runs avionics onboard the real planes, which ultimately led me to programming practices used to write such software. These two blog posts say most of the things I wanted to write here.

At the end, one thing is clear: designing and writing software must stop being something of artistic value and creative in a sense of expression (which often leads to "broken by design" state) and has to become something that is formally provable to be correct (see also Correctness by construction (1,2)). A good first candidate for this are mission critical systems on which lives depend on - such as airplane avionics. It's good to see that tools for this exist and are freely available. In the light of recent DNS vulnerability, which is there by design, I wonder what would happen if DNS was designed and implemented with such methods.

It was also pleasantly suprised for me to find out that I use some of the methods described in my own work. That's probably why I have free time in the first place

How I see modern Air Traffic Control

A few years ago I started expanding and overlapping my hobbies. Obvious overlap between being a system administrator (and integrator and architect) and flying is Air traffic control or ATC. I joined the virtual flying community and observed the procedures there and visited Slovenia Control and Ljubljana airport with them. I'm also reading AeroSafety world online magazine and am following aviation-safety.net and flightglobal rss feeds. If it is worth anything, I've also watched all AirCrash Investigation tv documentaries and IVTV dvds. I also asked our ATC for their SOP documents but was understandably denied the request as they're internal documents.

The most pressing problem of ATC today is how to increase the capacity of airways to safely carry more planes (=passengers) from point A to point B. Based on the little information I have available, I put together a sysadmin's view on how I think it should be done.

While one obvious answer to that is to build larger planes like A380, this cannot satisfy all needs as not everyone will be flying around in those large planes. We need something else.

What is the main job of ATC today? ATC business is to provide separation between planes to allow safe flying. Of course this separation is just the opposite of squeezing as many planes as possible into the same air way between two points, so the workload and the stress of ATC folks increases. So the question is how to increase the density of airplanes in the sky while decrease the load of the controllers?

Spacing between the planes is largely determined by the delay by which the controller gets the status updates on his screen and the speed he is able to communicate his instructions to the pilot in relation to the speed airplanes fly at, plus all the necessary safety margins. Radars spin only so fast, atc radar picture is composed of information from many radars and it needs a few consequtive updates to calculate airplane vectors ... then processing also takes some time ... At the end it looked painfully slow and sufficiently outdated to me that I thought "this could and should be done better".

I'd say give the freedom to the planes. Don't tie them strictly to corridors from waypoint x to waypoint y. Let them fly as straight as possible from their origin to their destination.

Oh my! The chaos!

Yes. There can be a lot of order in chaos :)

What I would like to see is better integration of TCAS and ADS-B with FMC. Both already "hear" properly equipped airplanes from over 100 miles away, why is then FMC not told about these planes? Next step, when FMC is aware of them, planes should be able to automatically negotiate each their own optimal flight path to prevent not only colisions, but close encounters as well.

When I read about TCAS on wikipedia, I was very suprised to see that TCAS by itself is not aware of the current performance envelope of the airplane nor the terrain over which the plane flies. Thus it is theoretically possible for TCAS to issue a RA of climb when the plane is not capable of climb or to issue a RA of descend when the ground is dangerously close. This clearly shows that there is no proper interaction with TCAS and other airplane systems. In sysadmin speak we say that the unit is not efficiently integrated into the system. I find this interesting, as there is so much time and energy spent in crew coordination procedures, how the PF and PNF share their workload and cross check each other ... and then the instruments are not treated in the same way and are allowed to work one over the other. This is something that clearly needs to be taken care of, the sooner the better.

The other interesting thing I read about TCAS on wikipedia is that it is basically limited to about 1MBit/s of bandwith to communicate with other planes and that this limit is already a problem around some of the bussiest airfields in the world. Whoever designed it that way, I can only hope they left enough flexibility in the packet format to upgrade it painlessly to higer bandwith.

ADS-B is the next interesting piece of equipment that is being introduced into planes. It extends mode-s info with "state vector" so that other airplanes "hear" not only where a certain ADS-B equipped plane is, but also where it is pointed at and how fast it is moving in that direction. This improves situational awarness a lot, but in order to decrease ATC load as I see it, it should also broadcast the plane's intentions of where it wants to be in lets say the next 5, 10 and 30 minutes. That way other airplanes would be able to identify them as potential threat. When two airplanes would find out that they are going to cross, they would enter negotiations on how to avoid eachother while taking into account everybody else, aircraft performance (how they're able to perform the avoid maneuvre), weather and ground situation (in which direction they can avoid). All that fully automatically and long before the TCAS would even issue a traffic warning.

When all this becomes mandatory and the density of the metal (and composites) flying over our heads increase, there will come a situation where two planes will figure out that there is no way to perform avoidance without crossing someone else flight path. That will create a whole storm of negotiations, which can hit time or bandwith bottlenecks just by the nature of complexity of these algorithms. By then I expect swarm algorithms, which are currently being studied in the fields of micro robotics and crowd modeling, will be understood well enough to be ready for implementation into this system. Basically someone needs to say "I will perform such avoidance maneuvre and all others must adopt to me" in a way that is the most efficient for the whole group.

Testing of such system would be very easy to perform in the virtual skies. Design a funcional model of such "next gen TCAS", put them on each virtual plane and then slowly increase the density of flights over a certain area and observe the results. It should be pretty interesting experiment :)

The final question is always "how to implement this?" I'm sorry to say that, but ATC folks will be sweating for some more years. Even if this is mandated by some regulatory agency (which afaik does not exist because of the democracy and free market b*****it), it is going to take years to adopt to the new ways. But the sooner the whole system starts to reorganize, the better for all.

Comments?

Update: after a chat with a few pilots and folks from ATC they explained that systems for this are in development for at least 15 years now and that the problem is not technical but political in nature. Basically, who'se to blame if things go wrong. Bah.

My thoughts on antispam

Everyone knows spam today. There are estimations that it makes more than 90% of all email traffic. Judging by my personal spam collection, spam is on constant increase.

I have always filtered spam out of my inbox by hand. I played with almost all antispam technologies out there today and haven't found any to be perfect. They're either too hardware resource intensive (long list of daily updated regex rules) or too users' time intensive (manual training of statistical filter). Two tecnologies that made me think some more were greylisting and one-time email addresses.

The only way to stop spam is to increase the cost to spam, which basically means to decrease its efficiency. I came up with a concept that does this extremely well, while offering end user perfectly transparent and easy-to-get-rid-of-spam mail expirience.

First of all, this concept cannot be implemented everywhere immediately, because MUA has to be able to make modifications to MTA's alias table in a reliable and trustworthy way. The most obvious places to implement would be webmails and I hope the authors of various mail clients will pick it up too. Also, all mail should be treated as spam by default unless it's delivered to a know alias.This means that a maibox protected with this method is useless for giving out on business cards and such :) Effectively it's a "you cannot write me unless I write you first" mailbox.

Here's how it works:

Imagine having an user at example.com with user@example.com mailbox. This user writes a mail to johndoe@company.com. User's MUA notices that user didn't have any previous communication with johndoe,generates a unique string and replaces user's from address with this uniquestring@example.com in user's mail. It also places this uniquestring in MTA alias table, pointing it to user+johndoe_company_com@example.com mailbox. Finally, it creates a (imap or local pop) folder johndoe_company_com in user's mailbox.
When John Doe replies to user's mail, the reply goes to uniquestring@example.com and end in this folder. Then, when user replies to it, MUA notices that user has already written to johndoe and uses the same uniquestring as from address.

Then when spyware on johndoe's windows machine picks up user's mail address, it picks up uniquestring@example.com. What happens is that all spam starts coming to a folder created for johndoe. User knows two things: that johndoe's computer is infected by spyware (and can tell johndoe about it) and that he can simply get rid of the spam by telling its MUA to forget this alias for johndoe. All the following spam will be dropped either into user's inbox (or even better, trash by default) or bounced by MTA (unknown user), depending on the whole config.

MUA also has to offer an option to generate such uniquestring (and alias table entry and folder) without writing out a mail, when user wants a contact email to put in a web form, for example. Or to start a mail dialogue with a friend who already has such system implemented.

Some thought should be given to how uniquestring should look like. We don't want spammers to sort them out easily from other email. We want them to mix with other legitimate looking mail addresses and clobber spammers' lists, making them slowly less and less useful. Also they should not offer any method of figuring out users root mailbox addres (or posting to that address should be disabled either by MTA or mail storage agent).

I would be very interested in any shortcomings you can spot in this concept. I plan to roll it out (all manual) on one of my mailboxes, just to see how it works in practice.

Job satisfaction

Not long ago I had an interesting discussion with my coworker about our jobs. As a sysadmin I often get requests from people that know me to help them configure their server, set them up a web page, mail account, etc., for a small fee. Or from some small company that does not have the expetrise to maintain their own server. But I gladly pass all such requests to the coworker, because I can's stand the feeling that any of those people would have the right to bother me at $random time of day because of some irrelevant problem, like spam getting through or somesuch.He offers them his price and then they deceide if they want him to fix their systems or not.

On the other hand, if someone ask me to teach him how to do all the system administration and is willing to learn, I'm more than glad to help. I don't even ask for a price, I just say if he feels like paying me, he can pay whatever he feels is the right price for the knowledge I gave him. But just the satisfaction of teaching someone is more than enough for me. I guess I got this after my father :)

News

Friends started asking me if I stopped writing here. Maybe this does look like a dead blog, but I have no intentions of abandoning it. The thing is, we implemented a very fundamental form of blogs on email.si a few months ago, which turned out to be quite an interesting social experiment. There is something different about writing on a blog you know will be read by thousands of people than writing just to yourself and for yourself, so many of my writings there look more like activism and preachery.
I've been also active on the RC scene with f5j.eu. I'd like to get more writers, but language barrier seems to be a real challenge here. Looks like not may young, english speaking folks are interested in flying model planes over in Hungary or Slovakia ...

Sad state of linux filesystems

Faced with a need for a reliable, well performing file system, a linux admin today is in a bit of a trouble. Ext2 is still in the kernel just for academic purposes, ext3 is "good enough" for majority but uselessly slow for what I want from it, reiser3 is in "don't tuch if it's not b0rken" mode but suffers from BKL use which limit its scalability, xfs and jfs are nowhere near a reliable state and reiser4 is "almost there" but due to Hans arrest, one wonders if it will ever be finished.

The more I think, the more I see there are only two usefull options for me: use Veritas VXFS, which recently became free for "smaller" installs or dump linux altogether and go with ZFS in Solaris 10. Or maybe Nexenta.

One wonders if so much choice really does make sense ... because these days it looks like FS knowhow is too much spread out and not focused on making just one, but really good FS ... As much as I despise RedHat for sticking with just ext3 in their RHEL line, at the end it would seem that was the right longterm choice.

Now if only chunkfs would become a reallity sooner ...

Rants ...

Recently my iBook was stolen (straight from my office, no less) and I took a look around if there's any notebook that I could replace it with. I'm looking for a light and small enough notebook to carry around that can run on its batteries for the longest possible time. I think I'd also like to have the ugliest notebook around (so no one would be tempted to steal it) and if it is in persoalised and unique in some obvious way, even better. Panasonic toughbook comes pretty close to that, but it is waaay too expensive.
But what I wanted to tell you is this. I checked web sites of all major notebook manufacturers and were shocked at how bad they were. I know what I want to buy, so I want the web site to let me input my requirements and then show me the products that match my requiremets best. None were even close to that. Shame.
Then, because I know how to translate my requirements to specific hardware configurations. I expected those web sites to select their models by the hardware. Again, no luck. All they do is offer you a list of their models (name + number) and then you have to dig the small print to get the hw specs. But I don't care about names and model numbers! I want a notebook with such and such configuration and I want a choice based on that.

Thinking over this again, I see a large business opportunity here :)

And there's more ...Since Ubuntu caused such a buzz lately, I deceided to use it on my new primary home desktop. And so far it is a general dissapointment. Ok, I expected to hack a kernel to get it running on iRam, but I also expected that would be the most complex tweak I'll have to make. iRam is the most exotic piece of hardware in this machine, everything else is pretty common these days. And guess what:
sound doesn't work properly. It also doesn't shut down properly if I have any nfs shares mounted and doesn't even boot properly if /usr is on non- local file system. It also managed to mix up different versions of nvidia-glx and nvidia kernel module. There are numerous other annoyances that I don't remember right now, but make the whole Ubuntu expirience anoying. Especially when
you look at the kind of people Ubuntu is targeted at - I can't expect my mom to figure out such problems, much less to fix them. She would simply conclude that her pc is broken.
And that is what Ubuntu is - broken.
It will remain broken for as long as they'll be putting out such releases targeted for average folks ... Me on the other hand will go on promoting Debian, because it doesn't promise anything, forces you to learn about the system you're using and because you actually need to spend a week or two untill it all works as you want.

Job offer ...

What do you do when you get an invitation to a selection process for a job from the most desired company to work for? I was very suprised when I got an email from them and also a bit confused as how they found me and why they invited me. It was clear to me from the start that my chances were slim, but I deceided to try it anyway. Just to see how it feels to be questioned by the people who really know things they do. Instead of a long description of what all I went through, this episode of anime Windy tales, apropriately titled "Audition Chronicles", show it best. And yes, my story ended in much the same way as in this anime.

Can't sleep ...

In nights like this, when my biorythm is synced to some place on the other side of our planet and my mind is wandering around, I usually take a nice long night walk in an attempt to follow it.

I go say hello to the crows, continue through the sleeping town to the river, follow it upstream, past the little hill with a church, turn west trough the fields and follow the rails back home. Or I go to the fields past the pharmaceutical factory, across the road to the little patch of trees and back. Or I drive to the nearby airfield and walk by its only runway. Either way it's at least one hour of walking.

So I walk in the muddy fields, trying to follow my mind ... which jumps around like a wild animal ... one moment it's all high and jumpy, full of joy about my recent achievement at my workplace, then next moment it falls down in the mud and drags behind my feet because it got some unpleasant association from that memory ... then notices a rabbit and runs across the fiel ... a rabbit, in this dirty polluted field! Then it stops suddnely and comes back, whining about pollution, ugly people and all bad that's going on around the world ... And then it's back on my shoulder, dreaming about what's still left on this planet to enjoy ...

See, it's not easy to be me. A coworker once said that I'm both a radical technocrat and a romantic hipie ... maybe, but that's just me and my mind.

This time, planned downtime :)

You've probably noticed (I sure did :) how stable this adsl link is. Almost wants me to set up some mrtg to show the percentage of time it's down ...
But this time, I'm going to reorganize my network layout a bit, because I want to test certain firewall product in reallife. Mostly configurability, obviously I can't really test throughput :) So expect some more downtime in the following days.

F5J is happening

In the last three or so years battery & motor technology has matured enough to power RC sailplanes and quickly, F5J was born. Following mostly F3J, it tries to combine soaring skills of the pilot with his knowledge about how to use available battery energy in the most efficient way for the climb. Just check the images from our last meeting ... pure joy.
Now the problem is that almost each country wants to combine soaring & electricity knowledge in their own way. Therefore it's kinda difficult to establish one set of rules that all will follow and that would eventually be recognized by FAI. But I have some ideas about that too ... hope they materialize soon.

Eye candy vs. usefulness ...

Yesterday we had an interesting talk at our weekly meetings of a local web community, regarding flash vs. standard html pages. I won't comment the talk here, but rather mention some thoughts that started floating in my head as a result of the talk.

Like, how I treat visually nice software vs. usefull software.

For example ... in the longstanding Qt vs GTK argument, I was always on the Qt side. That's why I was quite suprised when I installed qcad, it also installed Qt libarry as a dependency. Actually I didn't have Qt on my deskop system ... And no, I'm not using gnome either :) I'm an xfce fan. Xfce is GTK2 ... and wow, all the apps I use every day, are GTK2. Ok, Opera is Qt, but I use the statically compiled version. Why is that so?

Frankly I don't care about desktop consistency, unified look and feel, eye candy and all that stuff. I just want my app to do its basic job and do it fast. That means to be efficient and without all the bloat. I've tried to use kmail, it was buggy as hell and imap never really worked right. I tried to use evolution, it ate half the memory in my box, was really slow and I was using maybe 5% of its functionallity. So every time I came back to sylpheed, which I've been using primarily since version 0.3. Back then, it was even less than a megabyte. And so was Opera in its earliest versions ... the only browser that could fit on a floppy :)

How does this apply to the web pages?

Back in the early days of internet, it was mostly hypertext with an occasional picture here and there. It was meant to deliver information in its most efficient form known to man, written word. Now, if you look at the average site which job is to deliver information, for example any news portal, you (well, at least I) have quite a lot of problems locating a piece of news that is not a top story at the moment ... and usually I give up before I can locate it. That's why many web designers roll their eyes when I try to convince them that no design is the best way to offer information. That person that came up with the knob in Opera that turns off all the css stuff must be a real genius.

Also, another thing regarding user interfaces ... recently my job forced me to think about that too ... This day, stuff like Flickr is regarded as top and functional design, yet when I'm confronted with it, I feel like grandma waiting for instructions from her grandson what to click. On the other hand, stuff like wakaba and kareha that runs many *chan sites enables me to take in the whole functionallitty with one glance and immediately understand what this is, what it is for and how to use it. I'm sure many web designers would just turn away because it's so ugly, but as I said, I don't care. It works and it works damn well.

It is not unusuall that I see more and more where some article is linked from sites like slashdot, there soon appears a link to a 'printer friendly' version in the comments. Why? Because, what is understood as 'printer friendly', is actually more 'eyes friendly' too. Huh, what a discovery. One can more easily focus on the reading without all the blinking colorfull junk around it. Afterall, it's the information that matters and not the distracting coloful junk around it.

Sunny week

This week has been full of Sun all over the news. They officialy released their Niagara cpu as an Ultrasparc T1, released first Solaris builds with their new ZFS filesystem and of top of everything, offered their ide/compiler/tools Studio 11 for free. Looks like Sun is rising back from the ashes ...

Phoenix style :)

So what does all that mean? Right now it's kinda difficult to gather all the information scattered around many sun blogs and other sites ... Right now there are also no thirdparty benchmakrs to actually validate the value of all these new toys ... Because thats what they are to us serverroom geeks, exciting new toys. For example, this Niagara thing. It's a cpu that no one with their right mind would like to have in a desktop machine, but that just about everyone would have to like to have it in their web tier servers. Possibly also in the app tier. Because the thing is designed to run many jobs in parralel, each of them fast enough, not breaking any speed records for a single job, but very likely for the amount of work done in the unit of time.
Then, there's the ZFS. Smart folks at Sun have done an interesting job with it. While the whole industry is built on the disk-as-block-device + volume manager of some sort + filesystem paradigma, they were able to stand back and look at the whole thing from the entirely new perspective. Gone are the blocks, welcome to the objects. Gone are the fscks, welcome to the transactions and always consistent data. Gone is the predefined size of the filesystems, welcome to the dynamically resizing world. And so is gone the need for a volume manager. Other exciting blinking lights and knobs include snapshots and clones (or what is known as "flash copy" in IBM terminology), full checksums of all data, compression and encryption.
The last thing, Studio 11, is what I know the least about. Go ask developers, if they'd like to have optimized compilers for their machines and some tools to analyze performance bottlenecks ... I guess the answer is yes. Actually the compiler is the reason I wanted to get some SGI mips hardware, because I heard that when something compiles cleanly with that compiler, then it's really well written. Ofcourse, the common assumption was that their compiler is just b0rken :)

Now that reminds me I'm still missing some ultrasparc machines from my collection ...

Crows

Something very interesting has just happened. My workplace is located 5min walking distance from the train station and I usualy cross all the rails on my way. There's also a lot of electrical cables laid above the rails and my path leads me near the point where they all come to the ground.
Today, I found a dead crow there. A beautiful grey and black bird, probably young. I guess it got electrocuted on the wires there. I deceided to have a closer look at it and while I was turning the bird around, the whole flock gathered out of nowhere and started circling above me and yelling at me. They must have been very aware of the loss of one of their members, as they are very social animals. And smart too. Two of them even followed me all the way to the building while constantly yelling at me.

I kinda feel sorry for them ... but I've been through all that too.

I've always been very aware of the larger birds around me, but it's only recently that I started paying more attention to the crows. 15 years ago, they were nowhere to be seen in the cities, but now, they're all over the place. I even have a small roost of a few hundred birds in the trees behind my house. Now, after my Haibane expirience, I'm noticing them everywhere. I'd really like to understand them someday ...

Densha otoko

Not really an anime, but still coming from that land of the rising sun ... But let me begin this story with a movie from the west.

Recently I felt the need to see some live action movie for a change (I maninly watch anime). I checked local cinemas and noticed they have an airplane movie, Stealth. Since the reviews warned not to expect too much from it, I downloaded it and watched it at home. And boy, were the reviews wrong ... this movie is such a piece of crap that it's not worth even the bandwith I wasted downloading it, let alone the cinema ticket.

So I went looking for some interesting live action production from Japan. I heard about Densha Otoko back when the discussion started on 4-ch net culture board. As I was clicking around there again, I noticed torrents for first episodes were already available and some nice people already transladet them too. So I thought, what the heck, lets give it a try. And so I was in for a ride ...

You see, Densha Otoko is a story born on the net. What's interesting is that it's created by a geek (or Otaku, which is rouglhy equivalent in Japan) in a geek community and yet it managed to escape to the general public, which made a big fuss about it. Since then it was adapted to four different mangas, a movie and a tv drama. And the tv drama is what I finished watching previous night.

I'm able to watch most anime in a straight, one night viewing sessions, be it 13 or 26 episodes. However, I was not able to watch more than two episodes of Densha together. It's simply too much. Being able to identify 100% wih the guy, I don't remember any show that would make me squeak in front of the screen like a teenage girl at her favourite boy band concert. Japanese are known masters of exaggeration and this drama is no exception. It's a nice adrenaline rush ride and one I'll be remembering for a long time. The only thing I found lacking is that the ending feels a bit forced and out of place.

Pa je poletel!

Štrk namreč. Se mi je zdelo, da ga že kar predolgo zanemarjam ... no ja, glede na to, kako dobro leti, mi ni zameril :) Gre za popolnoma iz kompozitnih materialov narejen jadralni model s 3.3m razpetine in težo nekaj čez 2.3kg. Leti precej pohlevno in prijetno lenobno, kot se za velik model spodobi. Zaradi gradnje odpadejo "manjša" vzdrževalna dela, kot so raztrganine folije, tu in tam vdrta ali polomljena balsa, itd ..., ki so redni spremljevalec lesenih modelov. LiPo pogon pa mi omogoča, da je model vedno pripravljen na polet.

Zanimajo koga še tehnikalije?

Motor je Mega 16-25-4 s 4.2:1 planetarnim prenosom, ki žene 18.5x12 do 23x12 inč veliko eliso. Krmili jo Kontronikov Jazz 80-6-18, ki napaja tudi Schulzejev sprejemnik in hitecove hs-85 in hs-56 servo motorje. Vir energije pa je 8 litij-polimer akumulatorjev, zvezanih v 4 zaporedno in 2 vzporedno (t.i. 4s2p) vezavo, iz katere lahko za kratek čas vlečem dobrih 50A toka pri cca 14V.

Spet limanje ...

Potem ko sem pošteno ojačal trup pod krili, kjer je začel pokati, res nisem pričakoval, da bo naslednji konkretno popustil nos. Zanimivo pri vsem skupaj je to, da sem že nekaj dni prej čutil, da bo šlo nekaj narobe ... vendar ker si nisem mogel predstavljati polomljenih kril ali česa drugega razbitega, sem šel vseeno leteti. Pa tudi onesposobljen model bi mi prišel prav kot izgovor za nekaj drugih zadev :)

Steamboy

Kakšno razočaranje. Iz nekaj malega, kar sem o filmu slišal, sem pričakoval vsaj nekaj originalnosti. Tako pa ...
Če že delajo politično motirivarne filme, naj jih delajo tako, da te tolčejo po glavi (Arjuna) ali da te ujčkajo (Miyazaki) ... takole nekaj vmes pa zgubijo vso resnost in ostrino ter ne ponujajo nobenega užitka ob gledanju.
Poleg tega je cel film še neprijetno temačen.

Drevje vabi ...

Končno je tudi mene doletela čast parkirati model na vrh drevesa. Prva napaka: že cel dan sem slutil, da se bo zgodilo nekaj zanimivega, vendar nisem točno vedel kaj ... zato sem slutnje ignoriral. Druga napaka: preveč novih sprememb na modelu, od drugačnega težišča, večjega propa, do drugačne razporeditve komand na oddajniku, kar mi je onemogočalo, da bi v krizi pravočasno odreagiral pravilno. Tretja napaka: let s takim modelom na novem, neznanem terenu. Četrta napaka: ko sem videl, da je model za drevesom in ne pred, kot sem domneval, bi moral odviti ven od hriba in pognati motor, ne pa upati, da bom priletel do cilja skozi prostor za drevesom in pred gozdom.
Kot pravijo, vsaka šola nekaj stane. Predvsem se moram naučiti v trenutku presoditi situacijo in se odločiti za bolj varno možnost ...

Runway

"It lies still and quiet and is so simple: a field of asphalt. What is it then, that gives a runway its misterious, almost eerie quality of the unknown? It is the stepping stone to flight. [...] From this place more than one boy has flown to fulfill his dream of looking down on the clouds." So says Richard Bach in one of his short stories. I agree :)

Juuni Kokui - Dvanajst kraljestev

Te dni že drugič gledam to serijo. Fantasy sicer ni moja zvrst, vendar je ta serija izjema. Poleg razvitega in pestrega sveta vsebuje ravno dovolj osebnostnega razvoja likov in njihove introspekcije, da me pritegne. In ko me pritegne, se vživim še v svet in zgodbo. Sledi samo še užitek ob gledanju :) Priporočam.

I have wings again :)

Recently, I started flying again. A certain kind of competition with electric powered gliders is getting popular here and around the world, so I deceided to try myself at it. Here are some photos and a description of my model. So far I have made five flights and the trimming is almost good. It's about time I try catching some thermals.

Amazon wishlist

If you feel like buying me something, look here.

Fansub

Haibane Renmei - my slovenian fansub.

Coral cache

This site sits on a slow box on a relatively slow link, so if you feel like linking to it, please use Coral. Thank you.