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  1. Jambo

    eVTOL getting close to Type Certificate?

    Workhorse Surefly. Manned, if chained down, and this was in 2018, Im fairly certain they have flown manned and untethered Airbus A3. Its to my knowledge not flown with a human, but for these types of aircraft not really important Kitty Hawk Heaviside if you want the promo type video. All...
  2. Jambo

    Simple pusher pseudo-jet

    You cant just drop that aircraft buried in some psudo jet thread. Start a new thread immediately!
  3. Jambo

    Mystery Bullet Shaped Aircraft

    Well now, apparently it has flown. I cant find the pictures, article only references them https://www.thedrive.com/the-war-zone/30948/potentially-the-most-revolutionary-aircraft-you-have-never-heard-of-has-flown
  4. Jambo

    Mystery Bullet Shaped Aircraft

    Sorry to resurrect and old thread, but some news, with more details https://www.thedrive.com/the-war-zone/28409/the-mysterious-and-potentially-revolutionary-celera-500l-aircraft-may-fly-soon With some interesting cooling data:
  5. Jambo

    Lift Enhancement with Electric Motors

    One of the big areas I feel GA has to benefit from battery tech is to allow blown flaps/wings allowing either higher wing loadings or low stall speeds. Two I know are being constructed: 1. Props in front of the wing blowing over flaps (NASA X-57 Maxwell) 2. Ducted fans integrated in the...
  6. Jambo

    Neglected homebuilt niche?

    ^^^ I think Toobuilder nailed the problem. By the way, have enjoyed the discussion a lot, even if the business arguments left me a little lost. :gig:
  7. Jambo

    Neglected homebuilt niche?

    [/FONT][/COLOR][/LEFT] Sorry about that Okay... so we agree on that principle And frankly, what can Matthew do about that? Nothing. Welcome to the experimental market. Thankfully most people research and try to find out if the builder or the designer was at fault. Rutans...
  8. Jambo

    Neglected homebuilt niche?

    So... if this is wrong let me know Basically, you think the major issue Matthew has to address with this concept is finding design ways to 'force' a builder to not hotrod/overload a design? I don't see, practically, how to 100% do that in an experimental market. The only partial solution is...
  9. Jambo

    Neglected homebuilt niche?

    Again, and to reiterate an above post, when it comes to the experimental market Vans is the yardstick. gtae points out a really important fact about this concept of a 'lighter, optimized, lower powered Vans.' If its only slightly cheaper, which given the price of engines its going to be...
  10. Jambo

    Neglected homebuilt niche?

    True, and maybe that's a fair argument that 'if they want to build, they will build' But I don't think people built the Long-Ez just because they wanted to build. They also wanted something unique.
  11. Jambo

    Neglected homebuilt niche?

    And if those people had more money to spend, would they be driving around those cars? General aviation is almost by definition a LUXURY. For most of the United States, a car is NECESSITY. And I think you see this in the general aviation market. Simply undercutting price doesn't open up large...
  12. Jambo

    Neglected homebuilt niche?

    I think the issue you would run into is the fact that you would be competing against the certified used market. As someone who is a pilot, not primarily a builder, I run into this quandary all the time. I have to value my time as something. Even something as low time to build as 800hrs...
  13. Jambo

    Why battery-powered aircraft will never have significant range

    (1) yes, given pipistrel is already doing this. Although I feel that it is the noise/gas price issue specifically in europe that's driving it. In the USA, I still think ICE has the edge. (2) For a motorglider, hybrid might very well be an ideal powerplant, though haven't done any work on...
  14. Jambo

    Why battery-powered aircraft will never have significant range

    https://www.google.com/amp/s/seekingalpha.com/amp/article/4101993-teslas-first-decade-battery-pack-progress-much-ado-nothing For some pack level energy density from tesla. BLUF 150 to 170 Wh/kg. I'm sort of curious if pack design wieght is linear or fixed i.e. it's always going to weigh...
  15. Jambo

    Why battery-powered aircraft will never have significant range

    For current Li-ion types, yes, I agree. But do note that battery technology isn't really a 'trend' sort of improvement. Its advances in fits and starts with a sudden introduction of new chemical types and lackluster to flat improvements after. Given the titanic amounts of R&D money being...
  16. Jambo

    Why battery-powered aircraft will never have significant range

    What Wh/kg are you using for this? Using the videos numbers, and using your pessimistic 100 Wh/kg, Li-S would be 333Wh/kg, and Li-air would be 1,333 Wh/kg. So I have no idea what numbers your using...
  17. Jambo

    Why battery-powered aircraft will never have significant range

    If anyone wants to watch a video about 'hard' limits in engineering, this is an excellent one about rockets https://www.youtube.com/watch?v=oY3GclS5VUQ&list=FLUhhwmR-846HI4OwqlMocGA&index=131
  18. Jambo

    Why battery-powered aircraft will never have significant range

    Well... I guess I'll have to discuss ;) your opening posts video basically states in the end that the theoretical gains (given basically 3 chemistry generational leaps) is 20 times the amount of energy per unit weight. So really, your claim we are up against 'theoretical' limits isn't really...
  19. Jambo

    Greg Cole's side by side Electric motorglider design-Goshawk

    Nvm, misunderstood the question. I think your right Topaz about the 51% anyways, yes its the skigull, and the whole not needing medical for a motor glider is at 43:10 https://www.youtube.com/watch?v=2OZQ-9Nd76g I always thought that was what Greg Cole was looking for in this design, RV...
  20. Jambo

    Greg Cole's side by side Electric motorglider design-Goshawk

    Wasn't burt rutan trying to do this as well? something about once you have low enough span loading you can register as a glider, thus allowing much higher performance without the need for a medical?
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