Rick, Thanks for the clear explanation, particularly for the first question.
Regarding the wood, I think I will get the spar and the longeron materials from Aircraft Spruce and source the rest locally. Luckily there are two local builders around me, so I can consult them. Until next time...Mihaly On Mon, Jul 25, 2022 at 12:11 PM Rick Human via KRnet <krnet@list.krnet.org> wrote: > Mihaly, with regard to your "newbie" questions let me attempt to give you > answers to what I'm familiar with. > > > > 1. The FAA will only award an "Homebuilt" an airworthiness certificate in > the "Amateur" built category. The "Light Sport" designation is only used > for "factory" built aircraft that have been proven to meet the ASTM > guidelines. Now any aircraft that meets the LSA criteria for gross weight, > stall speed and top speed, etc. can be operated by anyone exercising the > LSA privileges. (Think Cubs, Champs, etc.) > > > > While some will scoff at an LSA KR-2, IMHO it can be done. Yes, keep the > empty weight as low as possible, use the same span as the "Diehl" wings > (24ft) and the original RAF airfoil in the plans. You may also need to use > vortex generators to meet the stall speed. I don't think by going "small" > on the engine output is necessary as you limit the top speed by the > propeller selection. (That's exactly what the Sonex folks do even with the > 120hp Jabirus'). > > > > 3. There are substitutions for spruce that have been successfully used in > the past, douglas fir being the most popular, stronger but heavier. I would > certainly check around your area for spruce availability, but spruce needs > to meet some pretty stringent criteria (including the way it's harvested comes > to mind) to be graded "aircraft". As you suggest you could use Aircraft > spruce in the spars and longerons and something else in the less loaded > areas. > > > > Do your research! > > > > Good luck > > > > Rick Human > > KR-2 N202RH (LSA compliant) > > > > > -- > KRnet mailing list > KRnet@list.krnet.org > https://list.krnet.org/mailman/listinfo/krnet >
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