Fuelman Quote: "I have a Rossi 50 that thrives on 0% nitro and 10% oil."
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I used to blend my own fuel.
On the Rossi .60 blackhead engines I flew back in the late 70s, I experimented with different oil and nitro mixes. The mixture which worked best was 3% nitro,
5% castor, 10% synthetic (UCON MA731) and 82% methanol. When the oil percentage is varied, this changes the density of the exhaust gas which also changes the sonic velocity in a tuned-pipe. So it was necessary to adjust the length of the pipe with the various fuel mixtures. The blend of 3% nitro and 15% oil provided the best results. This blend actually improved the "boost" from the tuned-pipe. The piped Rossi blackhead was absolutely the best engine for pattern I ever saw...and that includes the engines I saw at the TOC in Vegas. I don't think there has ever been a better engine for "ballistic pattern".
Regards
JC