Cut tips 3/8 to 1/2" each and balance. You can also sand a very small amount off the back trailing edge for 1-2 inches from tips. This will provide
a
washout for the tips which is always good for picking those lost RPMs that your uncut portions drag down.
A .40 will turn a 11-7. Way back in time, 10-6 was standard for .29-35 and 11-5 to 11-7 was standard for .40.
If your magnum .40 is rather new, I suggest cutting the tips for a couple hours running time. Then back to your standard.
Example of prop stuff. We used to have races with a standard sport model, .40 sized Super Tigre, 9-7 prop. That model was a bear to land with the 9-7.
For fun place a standard 10-6 on it and it was better. For real flying and fun place a 11-4 on it and it was MUCH better to land, a bit slower, but aerobatics were
(IMO) 10 times better.
