Geoff Smith 1 Posted June 19, 2011 Share Posted June 19, 2011 Hiya all. I have posted this request elsewhere but it seems to have been bypassed. I am in the throes of finishing my Webbit and have a couple of questions to help me along. Firstly, on testing the CoG I find that I am going to need 6.5oz of church roof. Is this excessive? Secondly, where the heck do I put it? Clean answers only thank you.Cheers my friends. Geoff Heavy weight Webbit builder (yes, both of us) Quote Link to comment Share on other sites More sharing options...
Tom Wright 2 Posted June 19, 2011 Share Posted June 19, 2011 Hello Geoff. That amount of weight is significant ,although i am sure most builders will say its ok .For test flying i always attach ballast using Velcro under the nose. Cheers Tom. Quote Link to comment Share on other sites More sharing options...
Geoff Smith 1 Posted June 19, 2011 Author Share Posted June 19, 2011 Posted by Tom Wright 2 on 19/06/2011 16:57:49: Hello Geoff. That amount of weight is significant ,although i am sure most builders will say its ok .For test flying i always attach ballast using Velcro under the nose. Cheers Tom. Thanks for this Tom. With the Webbit the only place I think I can get it is in the motor bay, there is not much room in there but I can get a fair bit in there if I shape it. Cheers mate. Geoff Quote Link to comment Share on other sites More sharing options...
Steve W-O Posted June 19, 2011 Share Posted June 19, 2011 I mounted my motor on the front, and the esc in the "engine bay", and the battery vertically May seem a lot of work at this stage, but that is a LOT of lead, a huge percentage of the AUW Quote Link to comment Share on other sites More sharing options...
Tom Wright 2 Posted June 19, 2011 Share Posted June 19, 2011 Geoff. It might be worth considering extending the nose with some lite ply faced balsa block, would not take long to do,IMO 6oz is to much to add but even so the model is probably capable of performing ok with the the extra weight .Edited By Tom Wright 2 on 19/06/2011 17:27:15 Quote Link to comment Share on other sites More sharing options...
Geoff Smith 1 Posted June 19, 2011 Author Share Posted June 19, 2011 Posted by Tom Wright 2 on 19/06/2011 17:26:34: Geoff. It might be worth considering extending the nose with some lite ply faced balsa block, would not take long to do,IMO 6oz is to much to add but even so the model is probably capable of performing ok with the the extra weight . Edited By Tom Wright 2 on 19/06/2011 17:27:15 Thanks for this Tom and Steve. I think I'm in for a rebuild. I am going to follow Steve's suggestion as this looks like the easiest and quickest way out. I'm a bit stuck for time before Greenacres but it will be done, maybe not maidened but definitely picture able. Cheers my friends. Geoff Quote Link to comment Share on other sites More sharing options...
Steve W-O Posted June 20, 2011 Share Posted June 20, 2011 Posted by Geoff Smith 1 on 19/06/2011 21:27:42:Posted by Tom Wright 2 on 19/06/2011 17:26:34: Geoff. It might be worth considering extending the nose with some lite ply faced balsa block, would not take long to do,IMO 6oz is to much to add but even so the model is probably capable of performing ok with the the extra weight . Edited By Tom Wright 2 on 19/06/2011 17:27:15 Thanks for this Tom and Steve. I think I'm in for a rebuild. I am going to follow Steve's suggestion as this looks like the easiest and quickest way out. I'm a bit stuck for time before Greenacres but it will be done, maybe not maidened but definitely picture able. Cheers my friends. Geoff Not too much to do really, I glued a couple of pieces of hardwood between the front former and the fuselage sides, and the cowling was a Robinsons squash bottle which I sprayed blue on the inside, and stuck some white vinyl on the outside, held on with a couple of ss screws. The "windscreen" slides under the cowl, and has a magnet catch at the wing end. The underside of the old engine bay is partially open to allow air out, the small gap around the shaft allowed plenty of air through, motor didn't get more than slightly warm after long runs static Quote Link to comment Share on other sites More sharing options...
David Gilder Posted June 20, 2011 Share Posted June 20, 2011 I have 6oz in my nose Geoff and it flies fine with it!! Its not excessive really!! ust stick it in and go for it!! Dave Quote Link to comment Share on other sites More sharing options...
Richard Harris Posted June 20, 2011 Share Posted June 20, 2011 Geoff, I use a 3000mah 3 cell Lipo in mine, would rather have a bit more duration than add cargo, there is plenty of room. But I did have the battery already so used what I had. Rich Quote Link to comment Share on other sites More sharing options...
Geoff Smith 1 Posted June 21, 2011 Author Share Posted June 21, 2011 Thanks for the replies gentlemen. I am in the throes of moving the motor to the front reinforced former, not very aesthetic I know but it will decrease the amount of ballast I need and give me somewhere to put the ballast I will need. Getting a bit panicky now 'cos tempis fugit and all that. Only got today to finish the alterations and cover the fuselage and do a bit of cosmetic work. Rich, I'm using a 2850mah 3 cell Lipo as well and I think this could be part of my problem, I've got it as far forward as I can so that's where it will have to stay. Cheers all. Geoff Last to finish Webbit Builder No 20 Quote Link to comment Share on other sites More sharing options...
Richard Wood Posted June 21, 2011 Share Posted June 21, 2011 Geoff, Have you got room to use a Rx battery instead of lead? My Webbit has a 2/3AF size 5 cell NiMH velcro'd & strapped to the top of the Lipo mount to help with CG. The ESC BEC is disabled by pulling out the red wire from the plug. Quote Link to comment Share on other sites More sharing options...
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