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Last bit of help please

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Geoff Smith 119/06/2011 15:24:17
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545 forum posts
88 photos
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)
Tom Wright 219/06/2011 16:57:49
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3908 forum posts
297 photos
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.
Geoff Smith 119/06/2011 17:09:21
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545 forum posts
88 photos
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
Steve W-O19/06/2011 17:14:03
2775 forum posts
310 photos
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
Tom Wright 219/06/2011 17:26:34
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3908 forum posts
297 photos
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

Geoff Smith 119/06/2011 21:27:42
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545 forum posts
88 photos
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
 
Steve W-O20/06/2011 05:23:10
2775 forum posts
310 photos
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
David Gilder20/06/2011 23:35:12
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1854 forum posts
656 photos
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
 
Richard Harris20/06/2011 23:48:36
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2054 forum posts
1892 photos
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
Geoff Smith 121/06/2011 08:01:57
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545 forum posts
88 photos
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
Richard Wood21/06/2011 08:28:48
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1088 forum posts
164 photos
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.
 
 
 

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