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  1. P

    Axel, Polish homebuilt glider.

    Henryk, I'm curious, you posted this picture in another topic here; Geiger Engineering - Elektroantriebssystem Their website claims from 10kW engine (with 13.5kW, full-throttle for take-off/climb) some 55kg of thrust from 130cm prop and 60kg from 140cm. My questions are; Which of the two props...
  2. P

    Environmental threats factors concerns etc for personal aircraft

    Either you use the wrong currency exchange rate or you get your gas at the wrong gas station... When I calculate that back to euro's/L at today's exchange rate, I find that you pay 2.16Euro's per L. The 'advised price' or whatever you want to call it is 1.769E as of today (ANWB). That is...
  3. P

    Smallest possible ultralight for real men 230lbs

    hmm... Have you ever seen that 98% carbon racing bike ? Carbon bike chain, everything carbon. It weighed around 2200 grams for the whole bike. That's two wheels, some steering bar, gears, chain, pedals, frame... And it could hold a 200lbs guy for 10k miles... On the other hand, it's not easy...
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    Smallest possible ultralight for real men 230lbs

    Correct me if I'm wrong, 450/6= 75kg =1g? Is his based on empty weight ? Or MTOW ? is it 450kg for each side ? 150kgMTOW ? Just curious. :)
  5. P

    Why not roadable aircraft

    Well, I actually believe that analogy DOES make some sense... There are a number of 'road-able' birds, say chickens, turkeys, ostriches etc. These birds are adapted for somewhat rough terrain and traveling over ground trails. They're too heavy or not flyable enough. Then there are a great...
  6. P

    Green Flight Challenge?

    kWh = 3.6mln joules. 1L of AVgas = ±30mln joules. Now electricity in a plant isn't made at 100% efficiency, far from. But energy wise, it's the most accurate way to compare. (I think)
  7. P

    Analternate aviation efficiency theory !

    Huh? Less drag then ANY glider cabin ? Better glide -ratio then ANY glider ? What in the world are you up to, or are you kidding us ? //For some reason, my RETURN key doesn't actually translate into new lines of text.
  8. P

    Interesting Bf109

    Besides, the chord at wing attachment seems to be to small too... Looks like the wing on the other side had an attachment point a lot further back. Propaganda ??? Why. OH, and like most of you, I wasn't around back then, but what I've seen from plane crashes, specially warplanes, they don't...
  9. P

    Don't go flying in Italy... unless you're a millionaire...

    Debt, money, it's all made up of air, and not the good kind you can suspend your aircraft in... Real value is represented in tangible things.. Currency is manipulated by anyone and everyone for their own benefit. It's what you price it at.. Basically... Otherwise you'd pay less, or more... More...
  10. P

    Scaled down Westland Whirlwind

    What about using electrics for the second engine.. With one of those folding props... When not in use, the folding prop folds backwards under the pressure and then sit still in the slipstream. If you only need it for take-off and initial climb that should be possible. The only downside to this...
  11. P

    Electra One vs. ElectraFlyer-C

    Now this electric car that won the electric/solar car race in 2009 (according to wiki). Has around 7m2 of solar panels... It says it produces around 1.8kW... That's about twice the surface you have ? Tokai Challenger - Wikipedia, the free encyclopedia
  12. P

    Electra One vs. ElectraFlyer-C

    Well there are newer solar panels that are somewhat foldable and could be applied on wings, and very thin too. So I guess those don't weigh kilo's/m2 but it doesn't add up to the structural integrity, so you end up strengthening your wings even more... (these are very expensive though) I'd say...
  13. P

    The Wave Disc Engine.

    Wave Disc Engine/Generator for Series Hybrids - Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com This one maybe ? EDIT; the picture looks like a badly finished sketchup drawing... Lots of unsoftened edges. Anyways... The function does look a lot like jet engine but a...
  14. P

    Electra One vs. ElectraFlyer-C

    I recently sold one of my old solar panels, about a square meter I guess... Couple of years old and it peaks at about 5-6amps (@12v). The newest ones have more output, but you are not going to power a plane with it... For that matter, sunlight contains somewhere between 0-1400W/m2 of energy...
  15. P

    Designing of my Very Light Airplane concept.

    Yeah, well the plane he built earlier, crashed. http://www.airnieuws.nl/phregister/480/OK-KUL-09.jpg I'm not sure why it crashed, lots of bad Dutch media stories... I Like the canopy, but the rest is too boxy for me. Doesn't give me a very good impression of structural strength, maybe he...
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    Designing of my Very Light Airplane concept.

    Double post.
  17. P

    Designing of my Very Light Airplane concept.

    Okay, so I'm still a bit flabbergasted by the regulations. But the smoke is clearing so to say. Also I came across OK-NUL, made by Dutch artist Joost Conijn, http://www.jelskeboonstra-ontwerp.nl/weblog/wp-content/uploads/2010/06/OKNUL43.jpg He finally registered his airplane in the...
  18. P

    Roadable aircraft

    Between 50 and 100k US$, if you actually want some people (masses) using it. Just think about high performance cars. Sure, many cost over 100k, but very little people actually buying (and using) them. So unless it's supposed to be a rich dude's new toy, I think prices for flying cars need to...
  19. P

    Adapting model aircraft engines for human use

    Hmm... Nice engine, but it has less output then those single cylinder 2 stroke engines. Maybe with a turbo ? Artus V12 Motor
  20. P

    Long Range Aircraft

    Sure you could fly 800 miles in your tiny aircraft, theoretically. But in reality you most likely encounter many weather changes that force you to change plans. Even more so on long distances of course. Apart from that, you might want to travel business class next time... :) It's not like...
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