Weight and Balance

by Ron Thompson in General Tech Discussion 11 years ago

I will be using 93 Octane Premium unleaded fuel in my Rotax 912 ULS (in a Zenith 701) What is the weight/gallon to use in calculating weight and balance.

This calculation is important since my 701 has four 11 gallon tanks.

Re: Weight and Balance

by Roger Lee » 11 years ago

Roger Lee

125 5.12k 4.53k

Normal calculation number is 6 lbs. per gal and I have seen some use 6.3

Quote from another site, but good info:

"If you know the specific gravity (relative density) of a liquid, such as gasoline, you can determine the weight per gallon by multiplying the specific gravity by 8.34 lb/gal (the weight of pure water).

Gasoline has a specific gravity of 0.71 - 0.77. Multiplying those numbers by 8.34 lb/gal and you come up with a range of 5.921 lb/gal - 6.422 lb/gal.

This math works out because specific gravities are normally referenced to water for liquids and air for gases."

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Weight and Balance

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