Recent content by davidjgall

That's Camber Ratio, George; the height of the maximum point on the camber line with respect to the chord line, expressed as a percentage of the length of the chord line. The Min CR refers to how nearly "uncambered" or how "nearly symmetrical" of an airfoil can be used at the given point of...

Some of the links above do not work correctly. The links to the individual videos are here: Mike Arnold's AR-5 Up Close Alex Strojnik and the AR-5 pt1 - warning! - airplane nuts only! Alex Strojnik and the AR-5 pt2 - warning! - airplane nuts only! Alex Strojnik and the AR-5 pt3 - warning...

It is a reference to propeller efficiency so the power curve of the engine does not play into it. (That would be propulsive efficiency, not propeller efficiency.)

TL;DR. Peter Garrison is the Steven King of aircraft performance and design storytellers.

Hey BoKu, it would be nice to get an update soon since August starts next week. If you need any help we're standing by.

These are the NACA profiles that Riblett used to build his airfoils: 0015, 63-015, 64-015, 65-015, 30-015, 63-A015, 64-A015, 40-A015. So, YES, his airfoils are "very" similar. He also uses the NACA mean lines ("camber lines") which he modifies at the leading edge so, yes, Riblett's airfoils are...

There are many such papers. Most get it wrong. Save your sacrificial brain cells for life's truly important sacrifices, like a really good Scotch....

No Roncz airfoil has ever flown on a Quickie or Quickie derivative (Q2, Q200, Tri-Q, Dragonfly, etc.) I've been trying to get somebody else to be *that* guinea pig for a long time. The Quickie/Q-2 used the GU 25-5(11)8 airfoil on the canard, which was replaced by the NLF(1)-0417MOD airfoil on...

Riblett's airfoils *are* NACA 64-66 series airfoils (actually 63-65 series; and assembled incorrectly) and the NLF airfoils were largely miserable in practice, but I'm with you on the rest of the sentiment. (Due credit to Riblett: he had a legitimate beef with the leading edge treatment of the...

Except Riblett was wrong about how to "assemble the parts."

https://www.homebuiltairplanes.com/forums/threads/ideal-weight-distribution.33772/post-544760

IF ONLY that were operationally true; finally, an explanation for why all my landings were clunkers! jk

Which one? Inboard, mid-span, outboard? I'm fairly certain Greg Cole didn't use just one....

https://www.coroplast.com/

From the kollmanwings website: "For Monarch f and Pioneer 2 plans contact Jim Marske http://www.marskeaircraft.com/"