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Homebuilt Aircraft & Kit Plane Forum

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  1. L

    Aussie Double Eagle

    Matt, are there reliable PSRU's being used with the BMW ? George (Beissie Qld)
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    Paulownia Elongata?

    RTFM, your correct Hoop pine is the suggested replacement for Spruce in Australia, it may be a little heavier. George
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    Paulownia Elongata?

    I have a sample of Paulownia, it is extremely light, it is classed as a hardwood by US standards, because it have leaves, that always amuses me. It is so far from being a hardwood of what we have in Australia, Ironbark is a hard wood and bloody heavy and used under railway tracks. I can't vouch...
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    Engine debate and choices?

    Referring to Dan Thomas's post. George
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    Engine debate and choices?

    Here! Here! George
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    ASSO Jewel X Plans

    Thanks Ray, I sent Electron an Email, The Asso-X design is something I have studied, however there are aspects of design I wouldn't copy, yet many have. Yes it's light and it will go fast enough, however it's small and IMHO needs to be a little larger. I believe the (personally) the Wing...
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    ASSO Jewel X Plans

    raytol, looking good your HT doesn't appear to have the anhedral, what is your Wing Dihedral? Is your plane bigger than the Asso-x ? George
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    ASSO Jewel X Plans

    A quick look at the Asso 4 Whiskey reminds me of a RV style aircraft. The Asso x is a smaller and a totally different design, I'm still trying to find out why the HT has Anhedral- any suggestions? Mind you many copies of the Asso x have been made and the most recent moved away from the Anhedral...
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    Gross weight increases for 'stretched' aircraft

    RVC, Short coupled is generally considered to be when the Lever Arm is less than 3 times the Wing MAC. The Tail volumes are governed by the Lever arm as Billski suggests, for HT Volume coefficient ranges from 0.43 to 0.5+ for VT 0.045, all these things should be considered. Generally the extra...
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    Problem with static margin and neutral point

    Scheny, 0.7 adds over 64" to my lever arm, way too much. George
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    Problem with static margin and neutral point

    Scheny, 0.7 is high, considering larger Volume coefficient leads to excess weigh and Drag. Orien (Bill Husla Dec'd HBA member) an aircraft designer, who's company is Orien, suggested a Minimum was 0.5, but it depends on the Aircraft size weight etc. The lowest I've seen from Books is 0.43 to...
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    Intro

    VB, I initially wondered why he wanted to be on here - just maybe to give advice, which is always welcome. So a big Welcome Steve. George
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    rectangular spar shear web

    ragflyer, a lot of FOS figures are related to methods used, from high quality controlled temps/ vacuum formed to hand lay-ups by amateurs, which I feel could well fall into the 3 to four category, but sample testing would indicate that. George
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    Free Airfoil Design Software

    I think it's wonderful that Aero-dynamists can design Airfoils for a particular design and it's design goals, but that's beyond the average pilot/ designer and available software. It seems John Roncz doesn't always get it right. Given the type of aircraft we are interested in, I wonder why...
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    rectangular spar shear web

    Without understanding the Elliptical Lift distribution of the Wing, it's hard to understand the strength required along the Span for both Caps and Web. The Web would most likely be the first thing to fail taking the Caps with it, it has a couple of failure modes, however using the Beam Buckling...
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