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

From: "kb11troy" <kb10troy@...>
Date: Wednesday, March 21, 2012 8:17 PM
Subject: Re: Carbon Booms - Goodwinds
I'm getting consistent 90'- 100' launches (measured by a RAM3) on my Bug with the fishing rod boom. Must be working well :) Rick --- In BugHLG@yahoogroups.com, Tim Schuh <tim@...> wrote: > > On 3/21/2012 2:31 PM, raincityflyer wrote: > > > > 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. > > > I agree with Chris. I've used P90 and P100 tubes on my 1.2m and 1.5m > woodie DLG experiments without any issues at all. In fact I used a P100 > on a 2M woodie floater pod and boom with good results. There's plenty > of stiffness and much lightness. For a quick, very informal comparison > here's what I have on hand and within reach. I got all the CF tubes on > sale and I don't think I paid more than a few dollars for any of them. > I know I got a mess of them for less than $20 shipped to my door in Texas. > > All tubes are 36" long. > > Generic fiberglass pushrod tube (I think from a Dave Brown pushrod kit) > OD: 0.300 > ID: 0.241 > W: 22g > > SkyShark II (no other markings and I don't remember) CF tube: > OD: 0.387 > ID 0.345 > W: 17g > > P90 tube: > OD 0.280 > ID .0240 > W:11g > > P100 tube: > OD: 0.285 > ID: 0.240 > W: 13g >