Even more off topic, but I wish I had enough money and access to the Temp/Humidity Altitude chamber here at work to do some test.

For the tests

I would buy a few OS 91s and a ST 90s and put them in a jig that would measure there thrust inside the chamber.

I would run them at temp ranges from 0-40 deg C (32-104 F). RH% ranges @ 25C: 10-95%. Altitudes ranges 0 ft to 10k ft above sea level. (no idea how high these engines will work in altitudes)

I would also take and mount Thermal Couples in multi locations on the engines to test there temperatures.

I would run 0% - 30% nitro mixes.

Different size and number of blades props.

I would also like to run a long term test to determine durability (might be expensive though, with fuel costs).

Hardest part would be making sure they are running at optimum (not to lean or rich)

I am sure that some tests like this have been done already but I wouldn’t know where to find the data/reviews.