Dave, I like your thinking on the DK canard. I considered applying the Roncz airfoil since it is 20.5% and doesn't need a change in layup schedule, either. However, the geometry of the hinge gap seems

Jon, Your "safety factor" concept is not a stretch but is right on the mark. Burt Rutan did as you've described on all his designs. The target "no control linkage" aerodynamic trim speed is in the vic

David, You might have fun with this link: http://david.gall.com/files/Airplane/prop-099.xls (If you don't have Excel, click here for the free Microsoft Excel Viewer download page.) David J. Gall

Prop calculator: http://david.gall.com/files/Airplane/prop-099.xls The "free Microsoft Excel Viewer" link in my last note didn't work. Try clicking the link on my home page if you need the viewer: htt

Yes, Keith, please do tell! David J. Gall

Mike, Welcome aboard. Consider Rotax power; the 447 and 503 have each been fitted with good results. There's a plan set available for the conversion, and you're in the prime place (construction stage)

From "Moldless Composite Homebuilt Sandwich Aircraft Construction" 3rd Ed., Sept. 1983, published by Rutan Aircraft Factory and available through Aircraft Spruce & Specialty for about $15: 4.0 Repairs

Paul, Why, yes, please. :-) David J. Gall Florida Q1 Onan under (eternal) construction

He will be missed.... :-(

Pat, you have the cart before the horse. Maneuvering speed is the maximum speed at which full and abrupt control deflection may be applied without inflicting permanent deformation on the aircraft's st

Pat, The theory sounds good, but the relationship between speed and AOA is highly non-linear. In fact, its quadratic. What this means is that at one end of the scale (the slow end), small changes in o

Aren't we forgetting someone in this discussion? There was a plans built LS-1 canard that came out about the same time as the factory version, and it didn't use those expensive spars but just a built-

Definitely!

Hello, Pat! :-) Okay. First, let me concede that given enough LEDs and a sensitive enough instrument, your AOA scenario could be made to work. The calibration might be a nightmare, but I understand yo

Dave, Thanks for the thorough update. I thought I'd been following these issues but I obviously missed a ton of info! One thing that I can add, though: I spoke to some fellows at Sun-N-Fun who are wel

Yes, it was Steve, now that you mention it. Here's the link: http://www.greatplainsas.com/airengine.html for the Great Plains Kohler airboat engine. David J. Gall

Dave (King), While you're shopping, have you looked at the Robin Subaru v-twin? They have a website (www.robinamerica.com), but I've not looked for any vendors. The engine is 650cc with iron liners an

Neil, If the howl is coming from the prop, two possible mechanisms come to mind: 1) The prop is vibrating in-plane in sympathy with the engine's power pulses. 2) The prop is partially stalled and the

Brad, The link you sent didn't work for me; I had to enter your email address, etc., at the home page. I finally got there and ended up at this URL: http://www.gatherround.com/j/AlbumIndex?u=116274&a=

Hawkeye, Do your inlets have divergent ducts, or are they typical flanged holes? David J. Gall