Dave M Posted November 20, 2011 Share Posted November 20, 2011 Hi Chaps, I have a Jamara? Discus CS glider that was given to me a while ago (lucky me), but it did not come with any wing joiners. Having looked at various sites on the web, it has 3 joiners, the center one 6 mm, either carbon, aluminium or steel rod, but no info on the other two. Could anyone advise on what the best joiners to use are and the sizes required,ie length and diameter. Or I suppose, where I might get a set. Any / all advice would be welcomed. Thanks, DaveEdited By Dave M on 20/11/2011 11:16:44 Quote Link to comment Share on other sites More sharing options...
Matt Jones Posted November 20, 2011 Share Posted November 20, 2011 I don't know the model / specific size but can share some experience. A few years back two of us bought Purbeck Sailplanes Graffiti's which came with both steel and Carbon joiners. We started with the Carbon ones but after several months of agressive flying both of them developed cracks at the point of the wing / fuselage join. Needless to say they were binned and we used the steel ones from then on. Quote Link to comment Share on other sites More sharing options...
Dave M Posted November 20, 2011 Author Share Posted November 20, 2011 Hi Matt, there seems to be some stories that this model has a similar problem and also excesive flex of the wings. Mind you I won't find out if I can't get some joiners sorted . Dave Quote Link to comment Share on other sites More sharing options...
Vecchio Austriaco Posted November 20, 2011 Share Posted November 20, 2011 There is a solid carbon rod, 6 x 600mm and 2 steel wires (piano wire) 2,6 x 170mm. There are no cracks or whatever problem with the wing joiners. The weak point is the fuselage which is quite brittle and therefore easy to break - a faster landing and you have easily a crack. Cheers VA Quote Link to comment Share on other sites More sharing options...
Dave M Posted November 20, 2011 Author Share Posted November 20, 2011 Hi Vecchio, thank you for your reply, its just the information I needed, and the tip about the weak point is useful as well. I wil look at re-enforcing it around the wing attachment points and the first couple of formers. Thanks again, Dave Quote Link to comment Share on other sites More sharing options...
Former Member Posted November 21, 2011 Share Posted November 21, 2011 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Devon Flyer Posted November 21, 2011 Share Posted November 21, 2011 Posted by Dave M on 20/11/2011 10:51:00:Hi Chaps, I have a Jamara? Discus CS glider that was given to me a while ago You've been keeping that one quiet Dave ! I'll dig me DG1000 out and we can have some combat. Quote Link to comment Share on other sites More sharing options...
Vecchio Austriaco Posted November 21, 2011 Share Posted November 21, 2011 Weight is no problem - I had to put quite a bit of lead into the nose - so if you do the reinforcement it will not lead to a problem. Where was the problem: bottom in the area of the cannopy. So best would be to put some glass fabric into the fuselage before or together at the same time as fitting the servo and the receiver board. Cheers VA Quote Link to comment Share on other sites More sharing options...
Dave M Posted November 22, 2011 Author Share Posted November 22, 2011 Posted by Devon Flyer on 21/11/2011 18:13:10: Posted by Dave M on 20/11/2011 10:51:00: Hi Chaps, I have a Jamara? Discus CS glider that was given to me a while ago You've been keeping that one quiet Dave ! I'll dig me DG1000 out and we can have some combat. yep, it 's been gathering dust, but its important to get these things out so that when the accountant see's it, she doesn't think I've bought myself an early Christmas Prezzie and I miss the chance of another new toy in a few weeks time!! Not too sure about combat tho Edited By Dave M on 22/11/2011 18:22:50 Quote Link to comment Share on other sites More sharing options...
SlopeFlyer Posted November 26, 2011 Share Posted November 26, 2011 My preference would always be for a carbon rod over steel. Steel can be substituted for carbon when extra ballast is required. The main reason is that carbon has excellent energy absorbing properties, on an impact, the rod will break and save your plane. I know I have nosed in from height and done nothing except broke the carbon rod. Carbon is a model saver. Not even mentioning tje lower AUW your plane will have. Quote Link to comment Share on other sites More sharing options...
Dave M Posted November 26, 2011 Author Share Posted November 26, 2011 I have now bought a carbon rod for the main joiner and some piano wire for the two thin locater / incidence pegs, Thanks for all of your replies and advice, Dave Quote Link to comment Share on other sites More sharing options...
Matt Jones Posted November 26, 2011 Share Posted November 26, 2011 Having come close to losing an expensive F3F type machine through failure of a Carbon main joiner it's steel for me every time now. Each to their own Quote Link to comment Share on other sites More sharing options...
SlopeFlyer Posted November 26, 2011 Share Posted November 26, 2011 If the carbon rod is within spec of what you intend to do with the plane, there is no reason why it should break in flight, carbon is excellent except under shear stress(during impact). Of course with carbon you need to ensure there are no cracks or the strength will be substantially reduced, then in flight forces may break it. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.