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  1. Xanadrone

    Which is more efficient - bullet shape or pure teardrop?

    What about a fourth (sub)version of the initial OP question, even if my third one (the Goldschmied shape) remained unanswered: would it be more efficient in drag reduction the modelling of a 3D fuselage shape starting with an airfoil profile known for good L/D ?! Like our revered (ex?)colleague...
  2. Xanadrone

    A really (too?) small & light micro-bipe STOL project (hybrid maybe)

    A simple (and just preliminary) napkin-sketch would be more clarifying than words about its inverted V-tail and landing gear: A few other details: this hybrid version with permanent IC-engines propulsion and e-motors used only for climb / take off is only one of three possible variants, that...
  3. Xanadrone

    Which is more efficient - bullet shape or pure teardrop?

    What about a third variant? - the so-called Goldschmied shape, thought to be somehow... self-propulsive also by the creator of the late (?) Synergy by McGinnis (btw, do you know something new about the fate of his audacious project? -- maybe too audacious, because started directly with a...
  4. Xanadrone

    A really (too?) small & light micro-bipe STOL project (hybrid maybe)

    First of all thanks for your input! I was initially tempted to post this idea in the Motorcycle Of The Air thread, or Flying With 14 HP (only in level flight though), or, or..., but I thought finally that it deserved a separate topic, because it includes some new and combined solutions serving...
  5. Xanadrone

    A really (too?) small & light micro-bipe STOL project (hybrid maybe)

    Just a few words for now: I tried to imagine an even smaller Cri-Cri, in biplane form (Mitja would say... topspeedish-small at just 9 ft. 6 in. long), but also less complex, expensive and time-consuming to build. ...Woud it fly though, despite its span of 16 ft.? And how good? - This would be...
  6. Xanadrone

    lightweight batteries

    Yes, the latest LiFePo4 technology already allows a good "energetic density" at more abordable prices than the Li-Ion ones and without the risk of firecrackers - ex: https://www.ev-power.eu/LiFePO4-special-cells/Lithium-Iron-LiFePO4-Battery-Cell-LFP-3-2V-72AH.html That means 0,230 kWh for 1.75...
  7. Xanadrone

    Roadable aircraft

    You've almost convinced me it's a bargain (@bmcj & @Topaz made me check my bank-account in a hurry ;) - luckilly i had the 529,000 $ left, but with the european-style comma... so it wouldn't be enough for a PAL-V tyre.) A bit more seriously now, I'm sticking even harder to my opinion after...
  8. Xanadrone

    Roadable aircraft

    http://www.autocar.co.uk/car-news/new-cars/world%E2%80%99s-first-production-road-and-air-legal-flying-car-sale-prices-specs-pictures ...is the latest announcement made by the [crazy] :gig: dutch company PAL-V about the imminent (2018) commercialization of their "legal flying car" in the final...
  9. Xanadrone

    Pulling with a Honda CRF150R with optimized prop and ReDrive

    (A short Later Edit, as I can't modify the previous post.) 1) Yes - but only in theory, since the long-term durability is what any VW conversions achieves OVER those revvy engines (addendum needed: this reliability drawback is valid mostly for the motocross hi-tech singles, other motorcycle's...
  10. Xanadrone

    Pulling with a Honda CRF150R with optimized prop and ReDrive

    Interesting motorbike air-conversion approach (I'm talking about the CRF250 variant, the 150 cc being too feable IMO) - and doable I guess, whilst some drawbacks need to be taken in calculation. And I'm not... hypothesising :gig: too much, being involved for decades in stuff related with...
  11. Xanadrone

    Slow delta wings?

    That's right. Though, from this image I don't see a huge thrust line vertical offset of the Delt-Air 250: delta kitten | flight international | skylane | 1962 | 0026 | Flight Archive
  12. Xanadrone

    I was bored last night so I designed a seaplane

    You're welcome, cheapracer - and yep, I thought too that some details are gonna be fixed after the initial general configuration phase (don't forget that the V-stab is also too small, as cluttonfred very well noticed). Anyway, various compromises are needed for seaplanes - in your project, the...
  13. Xanadrone

    I was bored last night so I designed a seaplane

    Telegraphic opinions: + (Plus) - good anti-spray config. - comfy cabin - nice outside visibility, despite the propeller placement - (Minus) - complex drive - smallish H-stab (for the relatively short-coupled formula) - no step on the hull Conclusion: I'd buy/fly one, if it would've had two...
  14. Xanadrone

    $5,500 aircraft?

    ...And quite more expensive in Europe, compared to the U.S. (the prices in euros around here - in the hypertaxated UE I mean - must be multiplied and not divided by the 1,35 factor between the dollar/euro, as would have been normal). Thus, I guess that approx. 7,000 euros would equal in Europe...
  15. Xanadrone

    Design contest results from the OUV, good read for aspiring designers

    Good read indeed, at least as a review of basic aero-design rules/formulas, sooo systematically mentioned by those tidy & logical germans - even if not always respected in their concepts. For ex., the UFO-ONE interesting negative swept-wings taildragger has the mono-wheel way behind the CG...
  16. Xanadrone

    Distributed Electric Propulsion

    I fully agree - Daniel Simon is a monster of creativity, even if his designs are not always targeted on the utilitarian side (btw, I talked with him shortly years ago, when he was junior designer at Audi and he's also a funny guy.) Getting back now to DEP, I also agree that some inputs are...
  17. Xanadrone

    Elytron 2S - the first commercial tiltrotor?

    Elytron 2S: The out-of-the-box tiltrotor concept ...shows a rather interesting concept of tiltrotor VTOL craft (it will be presented at Oshkosh too on the 3th of August), even if it's not totally new. The boxwing "Prandtl" scheme at least it's not new at all, maybe just the smaller rotating...
  18. Xanadrone

    New lightweight 120 hp engine?

    All the actual Moto Morini engines are V-twins with an 87 degrees angle between the cylinders. I've tested one of them (the Scrambler) in june 2009 and they are extremely torquey from low revs, with almost no vibes - although the motorcycle itself had some weird habits with those...
  19. Xanadrone

    CriCri MC-15 in NZ

    Yep, some of the original ZDZ / Falcon ignitions are crappy (me too I had years ago a forced RC-landing with a 60 cc ZDZ because of ignition failure, moving then to MVVS 58cc - a bit more thirsty, but very reliable) - so, good move to Rcexl, Shannon! (well, I guess your engines are not so...
  20. Xanadrone

    Please criticize my microlight multiengine design

    (New post whilst I couldn’t edit properly the previous one): Last month I had a little spare time to reset my direction to “only-land operations” - preferrably on the STOL side -, keeping the (stubborn, I agree) idea of the pilot’s prone position. None of the two versions satisfied me though...
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