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  1. J

    Wing area questions and a few others

    George, I hate to disagree, but have you looked at the Davis DA-11? DA-11 Specifications Engine: Briggs & Stratton Vanguard 18 HP Empty Weight: 175 lbs. Gross Weight: 375 lbs. Wing Span: 12'9" Chord: 30.1" Wing Area: 32 Sq.Ft. Airfoil: USA 35B Wing Loading: 11.72 Power Loading: 18.01 A.R...
  2. J

    Fin up - Fin down?

    Norman, The tube size is limited by the ready availability of stock size 6082-T6 here. Anything bigger than 4" OD doesn't seem to be available in thin wall. The other advantage of this size is weight. It's fine for the loads from about the 0.8m half span point outwards, so only needs...
  3. J

    Fin up - Fin down?

    An interesting group of pictures. Having been thinking about the high wing option on the drive to work this morning, I realised that the advantage it has of being able to be lifted off in one piece isn't unique to that configuration. There's no reason I cant make a mid-wing design with a lift...
  4. J

    Fin up - Fin down?

    Thanks for the advice, in particular the links to the Lapidar. I'd not seen this design before and really like the idea of being able to make a pair of fins do the dual function of being landing gear as well (I'm working to a very tight empty weight budget). What seems surprising about the...
  5. J

    Looking for a loop hole

    Several people are working on electric power and a few electric powered aircraft are now flying. Brushless motors are getting to be both powerful enough and light enough to be useful and the advent of reasonably affordable lithium polymer batteries has made them just about viable for a...
  6. J

    Flying wing with pitch control canard?

    Thanks Mike. I'm using a reflexed section. Having spent a couple of days running numbers through both DesignFoil and JavaFoil, I settled on the Fauvel section modified to 12% as being about the best for the range of Re etc. The differences between the various reflexed sections I looked at...
  7. J

    Flying wing with pitch control canard?

    Thanks very much for the useful tips guys, very much appreciated. I'm a "conventional" aircraft person and have to admit that this flying wing stuff has been both a steep learning curve and a fight against my natural mistrust of unconventional layouts. My layout is very similar to the...
  8. J

    Flying wing with pitch control canard?

    You're right, Orion, in that there is some similarity in planform with Jim Marske's designs, except that I've opted for a much lower AR, as I'm less interested in good glider performance and more interested in getting the dimensions down to a manageable size, without the added weight of making...
  9. J

    Flying wing with pitch control canard?

    Thanks for the quick response, Orion, much appreciated. I take your point about canard design, but would make the following observation, purely from a theoretical perspective. Let's assume that I've done the sums properly and have a wing that is statically stable when the C of G is within...
  10. J

    Flying wing with pitch control canard?

    Some may have already read of my thoughts on the "balsa strip construction" thread (which drifted off-topic pretty quickly.........). In short, due to the introduction of a new airworthiness deregulated aircraft category here in the UK, I'm looking to build something that meets the rules, but...
  11. J

    Balsa strip construction?

    Thanks for this Jim, I'll admit to not having taken the time, as you have, to examine a long wing version. As you say, the differences are interesting, with the major ones being the better glide performance and very much reduced power requirement. In theory, the reduced power requirement...
  12. J

    Balsa strip construction?

    Jim, I'm afraid that I'm not that Jeremy Harris. My only claim to fame is being the chap that did much of the design work and all of the stress work on the Escapade light aircraft (see www.realityaircraft.com for details). This started life as a joint UK/US project, and much of the initial...
  13. J

    Cri Cri rating - twin or single-engine

    In the UK the Cri Cri is treated as a single, due to the close spacing of the engine, I believe, and so can be flown on an SEP rated licence (no twin rating is required). I'm not sure if the other authorities share the same view though. Jeremy
  14. J

    Balsa strip construction?

    Thanks for the link Jim, looks interesting. Nice to see that they'd hit my target weight of 65kg empty, albeit without an engine, but with a much bigger wing that I'm using (the wing area on my design is only 6.8m², with an AR of just under 6). I've opted to "cheat" with the 1/4 scale, proof...
  15. J

    Balsa strip construction?

    Hi, first off, I'm new here, so please be gentle........... I've already had a hand in designing a kit aircraft using conventional construction, and am now working up a design for an ultralight flying wing. For reasons that have more to do with the new deregulated category rules here than...
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