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Run time equation?

Old 03-17-2002, 11:40 PM
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Default Run time equation?

is there a way too figure out how much fuel per minute you will use while in flight? I know there are variables involved but im talking about an average of half throtlle. Lets say for examples sake how long will a .15 run on a 4 oz. tank????
Old 03-18-2002, 09:01 PM
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Default lets see...

Seems that I heard somewhere that fuel consumption for 2-stroke glows on average is 1 oz / minute per .40 cu in.
So for your example:
.40 cu in / .15 cu in * 4 oz = 10.67 minutes at full throttle

I have no idea how accurate this is for smaller IC engines but it seems to be a fairly reasonable (gu)estimate for the .40 to .91
sized stuff.

Also, did some factoring based on some observed data from from my own engines. The reasonable factor I came up with is 250.
So .15 cu in / 4 oz * 250 = 9.375 minutes at full throttle

But as you already stated, there are so many variables.
Cheers.
James
Old 03-19-2002, 01:48 PM
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Default Run time equation?

Many variables, eg revs, flying style, prop size, mixture setting, engine condition etc

You will also find that some engines are more economical than others, I find my Irvine 46 guzzles fuel (6cc lasts 7-8mins), and is less econimical than a larger OS91 (16cc lasts 25-30mins).

After spending sometime with an engine, you'll get to know it's performance and if you have a computerized radio set, you can dial in timer settings for each model.

Cheers,

Chris

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