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Old Aug 24, 2014, 06:51 PM
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highonthai's Avatar
United States, CA, Los Angeles
Joined Aug 2013
193 Posts
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Gee Bee R2 aficionados (Question)

Picked up a used Gee Bee R2 71" fiber glass frame with a dzy 48cc twinn. (Sold by Nitro Planes)
Having completely gone thru it I'm ready to Cg it.
According to the specs that I found online it says that the CG is 105mm or 4.14" from the leading edge at the wing root.
Last night tried it at the suggested spec while inverted and is was way nose heavy, even when I placed a full 12 oz beer can on the tail!
Thats equal to 3/4 of a pound and it still wasn't enough!
The 105mm or 4.14 puts the Cg well over 25%. Have a friend that has flown a few R2's and he says everyone he flown has been below 25%.
Anyone have any experience with one of these R2's?
I could use some information.

Thanks
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Old Aug 25, 2014, 06:40 AM
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TomCrump's Avatar
Traverse City, Michigan
Joined Dec 2005
11,427 Posts
12 fluid ounces does not equal 3/4 of a pound.

The weight of 12 fluid ounces depends on the weight of the fluid inside, not the volume.

Have you weighed your beer can ? It is possible, by sheer coincidence, that it could weigh .75#.

In your attached files, did you read the part where it states that the model is designed to fly on a 1.20 ? In my opinion, your 48cc twin is too much power, and obviously too heavy.
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