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

From: John Gallagher <gldrgidr@...>
Date: Thursday, March 1, 2012 1:02 PM
Subject: Re: [BugHLG] Re: Bug Airfoil - Selig/Donovan SD8040
Chris, The drela airfoils get their superior performance because of their use of increased percentage of  leading edge sheeting on both the top and bottom of the airfoil.  The top needs about 50% and the bottom about 30%.  They wouldn't produce the extra performance with the Bug's no sheeting wing structure.    Without the sheeting you are just as well off with a thinned Selig 7014.   John ________________________________ From: raincityflyer <lewis08@...> To: BugHLG@yahoogroups.com Sent: Thursday, March 1, 2012 11:55 AM Subject: [BugHLG] Re: Bug Airfoil - Selig/Donovan SD8040   I've had good luck with Drela's AG 35-38 airfoils as they are flat bottomed and faceted on top for balsa construction and iron-on covering. No worries about airfoil fidelity when you try to get your covering to stick to concave surfaces. Cheers! Chris in Seattle --- In BugHLG@yahoogroups.com, John Gallagher <gldrgidr@...> wrote: > > If you have the original plans you see that the airfoil is the Selig 7014.  This is a very popular airfoil. > My suggistion was to reduce the thickness to  around 8%. >   > John > > > ________________________________ > From: Squid <littlefr2003@...> > To: BugHLG@yahoogroups.com > Sent: Thursday, March 1, 2012 1:22 AM > Subject: [BugHLG] Bug Airfoil - Selig/Donovan SD8040 > > >   > Hi Guys, another question. I have been doing allot of airfoil > comparisons with the current bug airfoil. > So far the closet i have found is Selig/Donovan SD8040 > <http://www.ae.illinois.edu/m-selig/ads/coord_database.html> . Ill try > and upload a picture for you guys to have a look at. Maybe John while > you are asking Carl about the legalities of me changing up his original > design, (which im sure he would be happy to have his design evolve and > be super stoked that there is such a cult following of his design) you > could ask what airfoil he used? > Also are there any suggestions for some variations in the airfoil? > Thanks to every one out there for your input so far. It is all > appreciated and its nice to no this is going out all over the world and > hopefully it will be a good little boost to such a beautiful glider. > Like Samson from Rc groups said "it looks like a piece of candy sitting > next to my other models". > Click here to view the Airfoil > <http://groups.yahoo.com/group/BugHLG/photos/album/520307090/pic/1466294142/view?picmode=&mode=tn&order=ordinal&start=1&count=20&dir=asc> > > [Non-text portions of this message have been removed] > > > > > [Non-text portions of this message have been removed] > [Non-text portions of this message have been removed]