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Engine basics => Engine set up tips => Topic started by: Mark Misegadis on July 21, 2009, 11:11:48 AM

Title: 1/2 A fuel - What percentage do you recommend?
Post by: Mark Misegadis on July 21, 2009, 11:11:48 AM

Currently running Cox motors with an AP .061 tossed in for fun. We are running either 18 or 20% Caster with 35% nitro. Sig or Wildcat are the two brands.

The 20% caster seems to leave things a little messier than the 18%. I have read numerous posts with widely varying opinions on the percentage of nitro to use.
We are at 6000 feet so therefore things work a little different here and perhaps this is why for regular sport flying I see lower percentage answers from everyone else in their similar posts.

Cox fuel worked fine back in the day. Does anyone have a figure on what the percentages were for it.

Thanks in advance for your advice.

Mark

Title: Re: 1/2 A fuel - What percentage do you recommend?
Post by: RandySmith on July 21, 2009, 08:32:43 PM

Hi we used
Missle Mist  which was 25%  I would suggest using at least that and maybe stick with the 35% at your 6000 feet

Randy

Title: Re: 1/2 A fuel - What percentage do you recommend?
Post by: Mark Misegadis on July 23, 2009, 09:28:11 AM

Thanks Randy!

Title: Re: 1/2 A fuel - What percentage do you recommend?
Post by: Larry Renger on July 23, 2009, 11:24:00 PM

I like 15% for the Cox reedies and Medallion, 25-30% for the Tee Dees.  For Norvel and AP Wasp, 10% is just fine.  For all, 18% minimum oil, half of it castor.  More oil assures less likelyhood of overheating, but costs fuel consumption (no apparant loss of power).