Archive of the Yahoo! Groups mailing list for the Bug hand-launch glider 2002-2018

From: John Gallagher <gldrgidr@...>
Date: Tuesday, December 6, 2011 12:41 PM
Subject: Re: [BugHLG] Re: AG38 airfoil
The AG3X series require d-tube sheeting to get the performance out of them.  That would be a neat trick for the eliptic shaped leading edge of the bug - you would have to mold it.  The AG38 is very thin (7%).  I believe that the AG36 (8.1%) is closer to the right thickness for a wing without LE sheeting, because of the valleys between the ribs.   John ________________________________ From: Mark Stephen <mark.stephen16@...> To: BugHLG@yahoogroups.com Sent: Monday, December 5, 2011 10:24 PM Subject: [BugHLG] Re: Thanks!   AG38? That might not be such a bad one to try and do a comparison. Don't know just how soon I would be able to get to it, material on it's way for some other builds that are planed, but if I were to hit a stall point for whatever reason... Mark --- In BugHLG@yahoogroups.com, John Gallagher <gldrgidr@...> wrote: > > We are stretching the span, what we need to explore next is a thinned airfoil.  I believe that the S3014 is about 9.5% thick.  Today this is considerred a thick airfoil, especially for a DLG.  Of course the sag between the ribs is thinner than 9.5% so the average thickness is actually less, but I still would like to try thinning the rib airfoil.  It should increase launch height.  The trick is to thin it enough to increase the launch height without thinning it so much that you ruin the thermalling performance.  I'm thinking about 8.7%. >   > John [Non-text portions of this message have been removed]