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  1. C

    pop up wing

    Anyone ever considered using the technique applied to things like tents or washing baskets to make a folding wing that by twisting can be compacted and erected? The rodding would be around the periphery and parafoil 'cells' would give the wing some Thickness etc. I'm picturing something in...
  2. C

    All moving Elevator integrated in flying wing?

    Im posting a very quick sketch of something I dreamed up, that I would be pleased to know has any potential merit? It may be that someone can suggest why it would not work, such as for reasons of being too short coupled in pitch, or that there may be some practical reason why it should be a bad...
  3. C

    Flying Chicken ,great first project?

    Hi THis guy seems to have pulled something off a quite unique design realisation, for which he should be commended as it flies as anticipated (always a bonus) Looks weird but visibility seems to be a bit better than its derivative aircraft (whatever that was) Is this not a perfectly valid...
  4. C

    Flight Dynamics Seasprite/Flightsail by Tom Purcell (1970)

    Hi. Does anyone know if this aircraft ever reached fruition, and what then lead to its demise as a veritable waterborne aircraft configuration? See. Attachment browser: Flight Dynamics Seasprite Sailwing002.jpg by Airboatflyingshp - RC Groups Could this arrangement (lifting fus+ flexwing...
  5. C

    12kg plywood floats for a Pou du Ciel

    Hi. FLOATS: TAHITI ARNOULD's HM293 HYDRO - Flying Flea Can we please discuss the details of this pair of floats, their construction, ie materials grades required, methods, etc etc, which are probably all on the drawings except I cant read all the information (bits in French, pardon!). Can...
  6. C

    A couple of designs that I found from yesteryear

    For those interested in compaction.... The first is a proposal in Mechanix illustrated 1953 for a boxwing turboprop I think, I found in a second hand bookshop. While the second looks like a weight shifted staggered wing tailless biplane circa 1930. Any thoughts, they both seem obscure, the...
  7. C

    FlyNano is it a rehash of a Ligetti Stratos?

    Hi Somewhere on here I read that the Stratos lacked sufficient pitch stability, due to configuration. So this is the same configuration, no? This aircraft is 90 kilos empty, which is a good achievement. But how exactly has this team got one over on the public when Ligetti apparently got things...
  8. C

    Bede BD5 was it a death trap?

    Just saw this : Coors Light Silver Bullet Jet Team / Dual BD-5J Airshow / World's Smallest Jets - YouTube One comment below the video says ''yeah. I believe both of these men died in these aircraft. just about everyone that has flown a BD 5.... or any BD aircraft for that matter, has died''...
  9. C

    How is the wing profile preserved withouth luff lines?

    Heres a rather nice video of a single surface flexwing ULM in Nevada: Ultralight Trike Flying Las Vegas - YouTube Kingpost removed and struts fitted. But... Previously a flexwing relied upon a) tip rods to maintain washout b) luff lines to provide reflex This to maintain longitudinal dihedral...
  10. C

    Number of blades on an Autogyro

    I possibly raised this question before. However I'm interested to know how the number of blades on an autogyro affects the efficiency. A simple teetering head is obviously one good reason for having a 2 bladed rotor, but are there other factors? Obviously one blade is totally possible with a...
  11. C

    Polywagen

    I was browsing Sport Aviation where I found details from 1983 of the Polywagen. A kit of vacuum bagged composite sandwiches. Im asking if ribless wings like these employing sandwich skins on a box spar if there is more information on this kind of construction. It has a gt finish if nothing elseDave
  12. C

    Oversized tailplane (lifting)

    By increasing the size of a tailplane and adding positive camber the Center of Lift comes rearwards. We end up with a flying Flea til the tailplane eventually gets bigger than the mainplane when it turns into a canard. Langleys Aerodrome had the 2 mainplanes of equal proportions giving a center...
  13. C

    Bending of 'angle'

    Lets say I use 'angle' instead of tubing for longerons. How should this section be bent without over-stressing? Would 'mild steel' be more maleable than something harder, lighter, heat-treated, or hardened? My other post (Junkers tube-ends) concerned an idea I had to skin a fus. made from...
  14. C

    Junkers: flattened tube ends and spanwise tubing

    Probably the easiest way of connecting tubes to form a truss, is to belt the end with a hammer (or :) press), and drill a hole. Its similarly straightforward with wing construction to use the said tubes spanwise to carry the +ve and -ve loads. These are methods I think Junkers empoyed in their...
  15. C

    Lite-ply skins in place of GRP

    Hi folks. Excuse me for my absence recently. I heard somewhere (possibly from PFA Engineer here in UK) that an alternative construction technique to GRP/foam (like those used on Rutan Quickie for instance) was to face both sides of flat or 2 axis curved foam surface with lite-ply? Surely this...
  16. C

    Electric powered Gyro any thoughts?

    Given the propensity now for quite reasonable (45mins) flight times for electric powered aircraft like the new EADS Cri Cri is there anything to be said for using this technology in the case of an Autogyro? The rotor energy makes for some helpfull regenerative feedback by being coupled to a...
  17. C

    Martin Jet Pack comes of Age??

    Ok so heres a video showing the virtues but what are the problems? Dave
  18. C

    Breaking News today:Paper plane in Space

    Has anyone considered why this project should cost as much as it did? Operation Paris: Paper plane released into space to take amazing pictures | Metro.co.uk Also what further problems would arise if we simply use hot air instead of Helium? Dave
  19. C

    Bird geometry

    VB off, flaps & everything else on to hover in 30 kts. Sand in the water stirred up by the storm. Yfrog Photo : yfrog.com/msflapsonj Is this information correct guys?? Here we see flaps in action but I dont see 'flaps on?' in the first image? Yfrog Photo : yfrog.com/empresrj Dave
  20. C

    Electric motors in ?funny places on the airframe

    It struck me that another way to interpret the CRi Cri with its twin electric motors is to facilitate electric motor propulsion via Tailplane tip motors? Ok this requires heavy duty cables to this location from the ESC/bats in the nose, but would this kind of thing not be viable? Maybe for a...
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