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

From: "raincityflyer" <lewis08@...>
Date: Wednesday, March 21, 2012 3:31 PM
Subject: Re: Carbon Booms - Goodwinds
Make sure you are watching your weights with "retail" CF parts. The OD's may match, but the wall thickness is what kills you. The final version of the Little Nipper (Swyft 2) uses a wrapped spar and is really stiff. I opted to go this route to fight the flex you get in a pultruded spar. This flex takes a lot of height out of your launch as the wings oscillate up and down after release. The arc can be pretty dramatic. Same goes for the boom. The whipping oscillation deprives you of launch height as the tail wags back and forth. Carl designed this plane for a javelin launch with no torsion to the boom. Wing flex was also just a given in those early days. The LB will work with any combination of CF parts, just watch your weight. As they say - "Ounces are made up of grams." Stay light! Chris in Seattle I can vouch for the P100 fitting into the new AG37 wing, so don't be afraid to try it. --- In BugHLG@yahoogroups.com, John Gallagher <gldrgidr@...> wrote: > > A quick search produced Goodwinds and a good price on the P100.  I'd use one for the boom.  1/8" pultruded spars have worked fine for me.  Rick found cf tubes in either Walmarts of  Kmarts that look good. >   > John > > > ________________________________ > From: raincityflyer <lewis08@...> > To: BugHLG@yahoogroups.com > Sent: Wednesday, March 21, 2012 12:41 AM > Subject: [BugHLG] Re: Carbon Booms > > >   > Max - I personally stay away from pultuded tubes. I prefer wrapped tubes around 1/4" or 5-6 mm. There are plenty of kite stores online that sell them for $10-12. A Skyshark P100 will just fit in the AG 37 tip rib. > > Cheers! > Chris in Seattle > > --- In BugHLG@yahoogroups.com, "maxddnj" <maxdd76@> wrote: > > > > This is my second post and I apologize up front if this has been covered before. I did a quick search that returned nothing specific, just various mentions. > > > > What kind of CF Tube are you guys building with for wing spars and booms: Wrapped, Pultruded, Uni-Direction, Braided, etc... ? > > > > And where are you sourcing these types? > > > > Thanks for any information. I look forward to building the original first, then the new design when the group irons out any wrinkles. > > > > Max > > > > > > > [Non-text portions of this message have been removed] >