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  1. L

    BMW 1200 R

    The KR2S is a better option IMHO. The BMW Motor is OK but needs a good PSRU. Just research everything. George
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    SSSC-2 Higher AR and less drag for better soaring ( mini-powered sailplane)

    I would suggest buy Jim Marske's book, calculate the cap loads and go from there. I would also suggest the Carbon Rods have to be held in place to what ever type of WEB you choose to use and this would require a number of +/- 45° Spar wraps. I have seem where the Rods are embedded into timber...
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    Spar cap material

    BB & R, The Carbon Rods now used in many Spars achieve their max strength by having the Carbon TOW under load (tension), as it passes through a Die to remove the excess resin and maintain the Tension. This Tension must be maintained until the resin goes off to keep the Filaments (within the TOW)...
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    Changing cg for heavier firewall forward weight

    S. I run the numbers for the Vision and their all pretty good and I had some good discussion with the designer Steve Rahm when I was in the States, as I have the plans. Steve suggested at 100 hp the Subaru was a bit lethargic on a hot day, make of that as you wish. Also the weight is a little...
  5. L

    Changing cg for heavier firewall forward weight

    On reflection that may have been 200 lbs. George
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    Changing cg for heavier firewall forward weight

    S, I believe the Firewall forward limit is 300 lbs, that's everything from memory. If you can't keep it at that do what Billski suggests. I believe Steve Rahm used a 100hp Subaru engine initially. and the weight was OK. It may have been a EJ, not sure. George
  7. L

    Race 84 is Back!

    I wonder why they stopped making them? George
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    Aerobatic Tandem Two-Seater

    Rad-dude123, Everyone I know is using Riblett mainly for docile stall behavior, I'm using 37A 415, others are using 35A415 as Orion (Designer) apparently liked that one. I believe Billski is using one as well, can't remember which one. Their a modified NACA 6 Series, which is pretty good in...
  9. L

    Planning to construct a good composite curing oven...request some feedback/input

    For smaller heaters to heat Foam for bending I used Fibrous cement sheeting (won't burn) and cooking foil stuck on with silicone. Any variation of that for bigger ovens would do, you don't need thick steel lining, just something for reflecting the heat and something that won't burn for the...
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    Flying wing as cheap and simple option for basic fun flying.

    Rotax 618- Hello from Brissie! The following as I see it. The Tapered Wing is a Tad closer to elliptical than a 'Hershey Bar' wing, therefore a Tad more efficient, However a straight leading edge and a straight trailing should give the least distortion of what the air experiences as it travels...
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    Darrol Stinton's statement on wing AR(aspect ratio) for minimum induced drag

    I agree, stick to 6 to 9 for best AR I prefer 6 to 7 or at most 8, but different aircraft, different missions. Given the Spar Root needs to be the biggest section of the Spar and that thickness results on Chord length, AR is all a balance between competing considerations. Interesting...
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    Flying wing as cheap and simple option for basic fun flying.

    I saw a model demonstrated of a very similar wing construction shape and it was very stable, so I like it. I guess some things are needed to be sorted out. I would be interested to see what happens if it's built. George
  13. L

    Looks like a Mustang?

    Did someone ask what the Airfoil is? TIA George
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    Spar cap material

    TFF, in regards to Tooling- ever hear of Bobbins, their stainless steel inserts where the Glass or Carbon is wrapped while maintaining some tension, some pins would also do but the Bobbins have a hole in them for mounting in structures - if desired. There is probably a number of ways of doing...
  15. L

    The new project aircraft VP 12. Ukraine

    Alex Lovely work, beautiful finish - one thing I was wondering about is the radius of the cockpit area Chine, looks rather sharp but looks can sometimes be deceiving. George
  16. L

    Spar cap material

    TFF, I have considered this myself, in Carbon rods they immerse the Carbon Tow in Resin as it moves to a die under tension, one to remove excess resin and 2 to maintain all the filaments in the desired direction. I would suggest just as much tension to do those two things. A bit of trial and...
  17. L

    Elevator balancing for tube and fabric tail

    Eugene, Simple answer welding aluminium weakens (makes brittle) the area next to the weld and that's were it will fail first, so no way around it, it's the nature of the material and the heat affected area around/ near/ next to the weld. George
  18. L

    Ideal Weight distribution

    Need Help 12, Don't we all need help at some time or other! What I ended up doing was cutting the fuselage drawing up in slices for Surface area calculations, found the circumference between slices (as an average) and added them all up, then I calculated the area between those slices and...
  19. L

    Airfoil Design

    Did you see the test and Mods for the PSRU. I'm keen to see how everything turns out. George
  20. L

    Lowest cost AHRS EFIS/6 pack replacement?

    I love it, getting close to a complete panel display - maybe with touch sensors. George
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