Originally Posted by
bjr_93tz
Being a bit lousy with my money, I mixed up batch of 25% nitro and 10% coolpower MV oil and I must say I was very surprised at the drop in performance. On the 19x11 I dropped from about 7.5K rpm to about 7.2K rpm, I was hitting full power much more often and the plane looked a little tired compared to how it had been running.
I only ran 3 tanks so the mixture could probably be tweaked a bit more, but it also seemed to be a bit thirstier as the tank had less left in it when the timer went off compared to the 30%15% brew. I'm at about 1500ft ASL
I'm happy to experiment a little now, as I'm enjoying the stick time although I don't remember this engine sucking down the fuel like this before. The 600cc tank is nearly disappearing in the same time as the 360cc tank I used to have fitted.
I'd say it's too rich on the reg Brett.
Dropping from 30 to 25 nitro would require the mixture to be leaned and going from 15 to 10 oil, would also require the mixture to be leaned out. Both on the reg and main needle. The reg makes a huge difference to fuel consumption if it's too rich. Much more so than the main needle.
I wouldn't be dropping nitro percentage at 1500ft.
My 185cdi swings a 21 x 10 at 6900 and uses 250cc's per flight.