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CG for thunder tiger sparkey

Cox Engines Forum  :: Models and Modeling :: Building Plans

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CG for thunder tiger sparkey

Post  akjgardner on Thu Apr 16, 2015 6:50 pm

I had a thunder tiger scooter years ago with a norvell .074.I had several hundred flights on it.One day it met its expiration date.I found its electric cousin on ebay.The directions say the CG is 1/4 back from the leading edge.This doesn't seem correct to me as i will have to put a bunch of weight in the nose to balance it.Can anyone here help me with this? thanks a bunch. The inquisitive Joe. (Sorry Mark, I borrowed that from you.)
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Re: CG for thunder tiger sparkey

Post  Ken Cook on Fri Apr 17, 2015 4:31 am

I don't fly r/c but a few of my club members do. I believe I'm familiar with this plane your mentioning. I do recall a conversation between a few that were flying this plane. I believe this plane has elliptical tips? I know they were not satisfied with the stock electric motor and went to a larger 400. This was a few years ago but I recall them saying just like you mentioned in regards to the cg being 2 1/4" back and not 1". I also remember that it seemed like this plane needed a lot of real estate to turn. They had a iron at the field twisting the tips . I don't know if any of this is helpful but it may be a start. Ken
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Re: CG for thunder tiger sparkey

Post  akjgardner on Fri Apr 17, 2015 8:20 am

Thanks Ken. That does help. I think I will convert this one to gas and put a babe bee on it and set the CG 2 and 1/4 back....... Babe Bee .049
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Re: CG for thunder tiger sparkey

Post  getback on Fri Apr 17, 2015 7:17 pm

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Re: CG for thunder tiger sparkey

Post  Surfer_kris on Sat Apr 18, 2015 3:28 am

The CG is fine right on the main spar, as I remember it, that's also where the manual says that it should be (right where the leading edge sheeting ends). I have a Queen Bee (diesel) in mine now and it flies great. Needs a little more downthrust than the stock engine mount gives, that's all.

A babe bee will be a little marginal I think but will probably fly it. A 6x3 at full throttle should be enough if there is no wind...



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