PPRuNe Forums - Specific Gravity Question?

PPRuNe Forums (https://www.pprune.org/)

- Private Flying (https://www.pprune.org/private-flying-63/)

- - Specific Gravity Question? (https://www.pprune.org/private-flying/232325-specific-gravity-question.html)

JetMouse

27th June 2006 17:48

Specific Gravity Question?

Hello

I would like a clarification please.

1 USG = 6lbs - does this already take into account a SG of 0.72?

So for my calculations 34 USG = 204 lbs (34*6)

also is it correct to say 1 USG = 3.785 litres and therefore 34 USG = 128.69 litres?

(phew) Thank you in advance...

Gulf Julliet Papa

27th June 2006 21:05

1 USG = 3.78L
3.78L x 0.72SG = 2.7216kg
2.7216kg = 6lbs

or 1USG = 6lbs!

So yes it does take into account the specific gravity

Mariner9

28th June 2006 08:33

[Pedantic mode] Technically, it is incorrect to multipy volume by SG to determine weight. In reality however, the difference is so small for a/c-sized fuel volumes that it makes no practical difference. (quite a difference for VLCC's though :8 )

Assuming 1 USG = 6lb, then the density@15C of the fuel is 0.7201 and the SG@60F is 0.7203

[/Pedantic mode]

All times are GMT. The time now is 10:43.