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  1. autoreply

    FS33 | Clever tail wheel retract

    Pretty clever mechanism, combining steerable, suspended and retractable. I'm not entirely sure how the inner mechanisms looks like, any clues from anyone?
  2. autoreply

    Various gyrocopters, classic aircraft, CW R3350 etc

    https://www.troostwijkauctions.com/nl/aviation-industry/01-32409/ This is where I basically grew up. Sad to see that after Richard's demise his enormous collection/museum is split up. At least 15 of those airframes are airworthy or really close to it. A tiny selection: 2. 1937 Fairchild 24C...
  3. autoreply

    Lecture about the JS3 airframe; from initial design to first flight in 9 months

    https://livestream.com/accounts/19840380/events/7714527/player?width=1280&height=720&enableInfoAndActivity=true&defaultDrawer=&autoPlay=true&mute=false It's a two hour lecture. Absolutely worth it. It gives a good insight on how to develop and design a cutting-edge airframe with a small team in...
  4. autoreply

    Photo report: Deutsche Museum Oberschleisshiem

    Here's the pictures: https://www.dropbox.com/sh/3yhyrp22kdzj7dj/AADOq16ieqPtFjgHzJmusD6Xa?dl=0 You can watch the pictures 1 by one or download everything (top right corner, download, download all). Link will fail in one month. If there is demand I'll extend it a bit. Quite a few hidden gems...
  5. autoreply

    Some quantitative data about fiber volume for hand-laminating and vacuum-bagging

    https://akaflieg-dresden.de/d-b-11/bautagebuch/ Infusion (RT, woven) on the order of 60-62%, my own measurements.
  6. autoreply

    Why battery-powered aircraft will never have significant range

    We've seen more and more discussion on HBA about battery-powered aircraft and hybrids. I've been arguing that it's fundamentally impossible to get range up enough for a practical airframe to be solely powered by batteries, necessitating hybrid aircraft powered by chemical means (piston...
  7. autoreply

    Man-carrying electric blimp

    After seeing this: I got to thinking. Instead of building something like the Aircam, a blimp with electric power is the ultimate STOL craft. Completely quiet and an unobstructed view downwards. Use hydrogen as a lifting gas and you can generate it at home. At about 50 cents per kg of lifting...
  8. autoreply

    Why a high fiber fraction leads to a dis-proportionally higher compressive strength.

    Never realized how significant this effect was (and consequently just used the compressive strength for lower Vf and taken the weight decrease for granted.
  9. autoreply

    Flywhale Amphibian certified as European UL

    http://www.aerokurier.de/luftsport/ultraleicht-lsa/musterzulassung-fuer-flywhale/729192 It's a great amphibian with some interesting (in the positive sense) design choices. If you're considering an amphib IMHO; this is one of the best choices around. http://flywhale.de/home/gallery.html
  10. autoreply

    JMB VL3 released as kit in the US; 175 mph on a stock Rotax

    500 hrs build time, total cost and performance is similar to an RV8 or so, but way lower stall speeds. Good to see a manufacturer release such a kit in the US in a sensible way; get flying planes that are proven, then start selling kits.
  11. autoreply

    Interesting Tyler MacCready interview

    Had never seen this one. Some great lessons on success and running a business by the son of the great Paul MacCready: 2: https://www.youtube.com/watch?v=-J6cTKLv1OE 3: https://www.youtube.com/watch?v=_-s7fQvJEwg
  12. autoreply

    Two-seat "racing" cockpit design.

    Many prospective builders want a second seat, but will rarely use it. Others are fine trading off lugage capacity, range etc for having someone in the 2nd seat. Assuming we don't increase MTOW and thus trade off fuel load or bagage capacity, the penalty of that second seat, both in structural...
  13. autoreply

    Aero Friedrichshafen (April 2017)

    So, who's going? I'm still undecided ATM, 50% I'll be there.
  14. autoreply

    A very affordable EFIS (Talos)

    After the Garmin G5 and the Dynon's something that's truly affordable, 600 bucks plus an iPad or similar for a full-blown basic EFIS. Sounds like a great deal.
  15. autoreply

    Why expensive composites can be cheaper; an in-depth comparison of weights and cost.

    https://www.dropbox.com/s/3d673dtzjrvsze5/A%20weight%20and%20cost%20comparison%20of%20various%20composite%20construction%20methods.pdf?dl=0 Data in the link above. An in-depth discussion with all the factors at play, assumptions and relations would take way more time that is feasible in this...
  16. autoreply

    Fixed pitch for unlimited aerobatics possible?

    After a long night with a fellow pilot, albeit a talented unlimited aerobatic one, we inevitably ended up in the pilot vs engineer discussion. The head ache the next day was due to the booze ;-) The point; how much power/weight ratio would you need more to give up a constant speed prop if you...
  17. autoreply

    Which aluminium alloy for high temperatures

    We are working on a vacuum table with heating capability. Table is 10'X5' with the vacuum bag on top of it. The current bottom plate is some kind of pressed wood (MDF-like), which when heated deforms considerably. We intend to replace this with an aluminium bottom plate. Max service temperature...
  18. autoreply

    Reno 2016, wazzup?

    So Reno is almost over (last day today). Any interesting designs/details? I've noticed Unlimited participation is at an all-time low (neither Dago Red, nor Rare Bear are racing). Speeds in sports and F1 class seem similar to recent years. Participation in F1 is still picking up. So what's new...
  19. autoreply

    Hybrids taking off.

    I stand my position that battery-powered aircraft are never going to work, save a few instances where short range is totally fine. (Motoring home sailplanes; "in the pattern" trainers etc.) It seems that finally, serial hybrids are really taking of with serious parties giving it a serious take...
  20. autoreply

    Great podcast (Michael Greiner)

    201 – Segelflugzeugkonstruktion | omega tau It is in German. Most interesting one though.
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