Urvine Q72 - RC Groups
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Feb 01, 2013, 06:38 AM
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Urvine Q72

Hi, can anyone help? What is the bolt/thread size of the 4 caphead bolts that secure the backplate? The thread looks coarse, possibly not metric, their diameter is 3.42mm or 0.135". Thanks
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Feb 01, 2013, 06:43 AM
Oxford Panic
AndyOne's Avatar
The Q72 used UNC threads, I think it was most likely a #6 32 but it could have been #8 32 size.

Feb 01, 2013, 10:38 AM
Registered User
Many thanks for the reply, I've measured the thread with a gauge, the 55* gauge reads 32G - 5/32", and the 60* gauge reads 0.8.
The reason for my question is the plane in your photo, the Panic - I've found some American capheads from a Great Planes Venus that match, as I need longer bolts for the Irvine backplate to allow for the Panic backplate engine mount.
Feb 01, 2013, 10:53 AM
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DarZeelon's Avatar

I sent you a PM (personal message).

Please read it.
Feb 01, 2013, 09:16 PM
Registered User
I TOBOR's Avatar
They are as mentioned above, 6x32

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