RE: Enya 120R Tach #'s
During the first couple quarts, I used some high pitch pattern props like 13x13's and 14x12's for airflow because when I was begining to run it in, it was in the 90's outside, I never did tach them. I did tap the muffler for pressure, which helped a lot. I ended up using a very wide blade 16x6 master scimitar because thats what my buddies are using on their Saito 125's on profile fun flys, and thats what I had kicking around. I have a couple 16x6 APC's somewhere, if I can remember to look for them, I'll run it up for a comparison for you. I think on a normal (non fun fly profile) acrobatic plane like an extra or cap or ultimate, this engine would be fantastic with anything from a 15x8, 15x10, 16x6, 16x8. On slicker, faster planes, a 14x10 to 14x14.
This engine has a lot of grunt to it, much more than my old OS 120 Surpass III and at least as much if not a bit more than the Saito 120's.
I may experiment around a bit with adding a head shim or two to the Enya 120R so it can burn more than 10% nitro because right now, it will not do so and remain friendly.