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

From: "John Gospodarek" <John.Gospodarek@...>
Date: Tuesday, June 3, 2003 9:25 AM
Subject: Re: More questions - wobbly wing
Henry, go out and buy some silicone ($2 to $3). I used it on my latest Bug and it fixed the problem. I would not expect the hot glue to work well because it sets too fast and is too heavy. The extra weight of the ply should not make that much difference, Fly what you got. If you need to, file the F3 notch a little to get the sides closer to the wing. You will be learning to SAL on your first fuse so it does not need to be perfect. The wing angle is not a problem until wou build the second wing and have to match it to the current fuse. I have considered putting the silicone on the wing and covering the fuse so I can make better use of extra wings. Just a idea that has not been tested. Anyway, good luck, and get it in the air. John --- In BugHLG@yahoogroups.com, "dimple_kwok" <henry.kwok@x> wrote: > Sorry for asking all these stupid questions. Every one is saying how > the bug is easy to build but I just can't help encountering problems. > Well, I guess this is my first scratch built... > > Anyhow I am still having problem with "wobbly" wing. I tried to use > hot glue (don't have silicon glue) method and it does help a bit. > Analyse the plan from the mechanical point of view, I guess what is > preventing the wobble about the axis of the wing is F3. Having said > that the depression on the top of F3 is rather shallow, and does > allow about of sliding movement. And as far as I have tried, it is > darn difficult to get the angle of the "notch" right to match that of > the wing... I wonder just how much the fuselage sides contribute to > the stable fixation of the wing, since they are so filmsy. Looking at > my failure there is a 1-2mm gap between the fuselage side top edge > and the wing. I wonder if this contributes to the wobbliness. > > I think ultimately the source of the problem is the dihedral angle of > the wing being slightly off from intended and hence the F3 / fuselage > sides don't quite fit... Too late I can't break the wing panel joint > or can I?? > > John - I presume you have had this problem as well? > > I plan to rebuild the fuselage anyway, since I use the wrong type of > ply (heavy one) for the formers. I am hoping that this time I will > get it right.. Any suggestions to make F3 fit, to make the fuse side > match the wing, and most importantly avoid the wobbly wing syndrome? > > Cheers, and thanks to every one who helped. > > Henry > > --- In BugHLG@yahoogroups.com, "John Gospodarek" > <John.Gospodarek@i...> wrote: > > It can be fitted with GE silicone glue. Put some clear sandwich > wrap > > over your wing and a bead of silicone on the fuse. Mount the wing > > into the silicone and let it dry for a perfect fit. After it is dry > > peal the sandwich wrap off. > >