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Old 05-07-2006, 09:53 PM   #11
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I am: Andrew Coholic
Join Date: Sep 2002
Location: Timmins, Northern Ontario
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ANYONE who tells anyone in this hobby, that switching from 15% nitro fuel, to 10 or 5% fuel will "cause major power loss" - is, well, either lying or misinformed. Its an easy test - just run both fuels in the same engine with the same prop/plug combo on the same day and tach them.

If you read my engine reviews in Fly RC, I often test the engines with at least 2 and sometimes 3 fuels (5, 10, 15 and sometimes 30%) and unless you increase the nitro content more than 15% you will see minimal gains (in most of the sport engines we run, ie, untuned general engines like OS, Supertigres, etc).

In many engines switching just 5% (like 5 to 10, or 10 to 15 - up or down) will at best lose or gain a few hundred RPM to (depending upon the prop maybe 400 to 500 rpm). Basically 2 to 4% power difference. Its hardly going to affect your plane's performance unless its flying on the edge of marginal already (in which case a larger engine, not more nitro would be the best fix).

I remember 15 years ago when I started flying regularly and buying more fuel, I used to buy 15% fuel because I thought it would be "better". Now I fly a lot of 5%, and 10% fuel - just because its cheaper, basically as good, and sometimes based more on the recomendations of the manufacturer.

Oh yeah - thats one thing a lot of guys seem to forget. SOme manufacturers (like JEN and MVVS for example) recommend you run 5% because thats how they are set up to run (head design and compression) and trying to squeak a few extra rpms by running more nitro will cause preignition and rough running and in worse cases, damage to the piston & rod.

Just my opinion based on some empirical testing, and running the various fuels in a wide variety of engine brands and displacement sizes.

Andrew Coholic -MAAC #26287L

1/2A to giant scale, IMAC, SAM, R/C sport, turbine jets, Heli's...
if its got a wing or two and an engine - I like it!
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Old 05-08-2006, 06:29 AM   #12
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I am: Ralph B
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Location: StoneyCreek Ontario

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Where can I purchase XP in Southern Ontario?Skycraft has stopped selling it.Can I order it in?
I refuse to join any club that would have me as a member.
Groucho Marx

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