CG for thunder tiger sparkey

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.)

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

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

getback on Fri Apr 17, 2015 7:17 pm

If it looks like this that is a nice looking plane ,, https://www.google.com/search?q=thunder+tiger+sparky+400&biw=1067&bih=517&tbm=isch&imgil=50myz83j8ElpLM%253A%253B3iLOdC_Tiw61iM%253Bhttp%25253A%25252F%25252Fwww.rcgroups.com%25252Fforums%25252Fshowthread.php%25253Ft%2525253D513404&source=iu&pf=m&fir=50myz83j8ElpLM%253A%252C3iLOdC_Tiw61iM%252C_&usg=__HFOvpRe8xv_XI0oOZCfYT15oXow%3D&ved=0CEEQyjc&ei=x6ExVb3zBoG3ogSS-YCoCQ#imgrc=50myz83j8ElpLM%253A%3B3iLOdC_Tiw61iM%3Bhttp%253A%252F%252Fimg363.imageshack.us%252Fimg363%252F2812%252Fsparky22yg.jpg%3Bhttp%253A%252F%252Fwww.rcgroups.com%252Fforums%252Fshowthread.php%253Ft%253D513404%3B768%3B576 WOW what a ddress

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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CG for thunder tiger sparkey

CG for thunder tiger sparkey

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Re: CG for thunder tiger sparkey

Re: CG for thunder tiger sparkey