Gliders > Scale
Slingsby Skylark 2
Alan_Perse:
--- Quote from: "billscottni" ---At smaller scales full size airfoils don't usually work. it's all to do with Reynolds numbers.
As Alan says Chris Wiliams advocates the Quabeck sections even in his 1/3 scale aircraft
--- End quote ---
Ah, you got there before me Bill :D :D
Ron:
Ah yes, Reynolds Numbers.
Wikipedia:
If an airplane wing needs testing, one can make a scaled down model of the wing and test it in a wind tunnel using the same Reynolds number that the actual airplane is subjected to. If for example the scale model has linear dimensions one quarter of full size, the flow velocity of the model would have to be multiplied by a factor of 4 to obtain similar flow behaviour.
Ron
billscottni:
One of our club members is a real airfoil buff. Right in to the whole mathematics of the things, which is how I know it.
If anybody is looking for good, SIMPLE, explanations try:
Understanding Aerofoil Date for RCSoareres, by Denis Oglesby. Available from Traplet
and/or
Understanding Polars without Math by Bill & Bunny Kuhlman available from
B2 Streamlines, http://www.b2streamlines.com/
Ron:
Thanks for that Bill.
I shall certainly look into those books.
B2streamlines also has a good few links to aerofoil plotting apps for Mac. :clap:
Ron
Alan_Perse:
Finally started some construction. I'm starting with the fuselage. According to the RC Model World magazine article on this plan, the Fuselage is supposed to be built on a jig in one piece (e.g. using whole formers not half formers), not sure if you understand what I mean. But there was no information in the article or the plan as to how the formers were to be attached to this jig or how they were to be aligned. So after much head scratching I decided to build the fuselage in two half's.
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