WWII P-51 Mustang machine gun test bench - photo

WWII P-51 Mustang machine gun test bench.

Fullsize image: https://diqn32j8nouaz.cloudfront.net...g_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...g_test_rig.jpg


Previously:

https://www.homemadetools.net/forum/...399#post122142
https://www.homemadetools.net/forum/...209#post161292
https://www.homemadetools.net/forum/...562#post170269
https://www.homemadetools.net/forum/...806#post175135
https://www.homemadetools.net/forum/...058#post172049

I love the straps to the test bench. Do you think firing the guns is enough to push the plane backwards? I bet that happened at least once before the straps got added.