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Single red TB tube shoots marble at 206 fps!

I shot the Boynton-Butterfly at its maximum extension of 80" (203 Cm).

Using a 15" length of Red Thera-Band tubing, the actual stretch was about 77" or 5.1X.

I measured the pull just below 15 pounds.

Shooting an 80 grain (5.2 gm) marble at 206 fps (62.4M/s) and getting 7.5 fp (10.2 J) with a 15 pound (6.8 K) seems very efficient.

The rubber remained healthy after shooting.

I wonder what double black or double gold tapered bands would do?
 

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Tex-shooter
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All I can say about these very long one is good gravy. -- Tex
 
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