Have a VQ 40- sized Spacewalker assembled.
Have 2 engines to choose from.

Need to know which is more powerful.

An allmost new Irvine 40 ringed engine or an OS 40 FP, also relatively new.

Would be mounted inverted with cowl and remote muffler.

Not looking for airshow aerobatics, just maybe a few loops and rolls.

Need steady medium performance.

Was looking to use a 10/6 3-blade Master Airscrew and spinner.

Any advice fellows?

thanx