At the small field launches I've been using 13mm A10-3t engines in place of 18mm A8-3 engines. This was first suggested by James Wentworth on a forum post.
It makes perfect sense - really a no brainer. (which probably explains why I didn't think of this years ago)
Right now at Hobby Lobby I can buy three A8-3 engines for $9.99
I can also pick four A10-3t engines for $9.99
Take off 40% with the online coupon its a better buy at $5.99!
$5.99 divided by three A8-3s is $1.99 each.
$5.99 divided by four A10-3ts is $1.49 each.
You do have to use a 5/20 engine mount but when the weights are compared,
The A10-3t engine and 5/20 mount are .43 oz.
The A8-3 engine alone is .57 oz.!
The A10-3t engine with the 5/20 mount is still lighter than the A8-3 by itself!
The graph above and side-by-side comparisons (on right) is a screen shot of the engine comparisons
Sure there are differences, The A10 has a higher initial peak thrust but a lower average thrust with a longer burn. The A10 has more propellant than the A8 engine.
An A10 engine will get any model you would normally fly with an A8 engine in the air - And, save you 50 cents per flight!
And, lighter by .14 oz. could get a few more feet in altitude.
In the future I'll be buying more A10-3t engines in place of the A8-3s.
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