I have a couple of older Super Tiger .15 yhat came from a combat flyer.  I would like to try them on a smaller stunt trainer but not at combat speed.  Can I run them at their normal rpm but use a low pitch prop to control lap times?  These are great little motors and I would like to use them but my reflexs will not handle the speed.
Bob

I have a couple of older Super Tiger .15 yhat came from a combat flyer.  I would like to try them on a smaller stunt trainer but not at combat speed.  Can I run them at their normal rpm but use a low pitch prop to control lap times?  These are great little motors and I would like to use them but my reflexs will not handle the speed.

I used to use ST.G20/15's in combat and had venturi's made for them with larger intake hole, I also tried drilling them out and several I used like that because those combat engines were used with bladder pressure,they were originally fitted with suction size venturi's. have you tried to run them on suction it may not work too well. The same thing with the ST. G15 goodyear engine (rectangular venturi) that was run on crank pressure I believe. After a few years I changed to using Rossi15's and never looked back.
Reason for this post is you might find you need different venturi's to run on suction. Good luck those were really good engines and easy warm starters.