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747-8I: Payload, Fuel Density, Range And USG  
User currently offlineSKY1 From Spain, joined Apr 2006, 879 posts, RR: 4
Posted (7 years 5 months 3 weeks 2 days 18 hours ago) and read 6324 times:

I was watching the Boeing web site relating to 747-8I Payload Range Capability (page 10) and I'd like to know:

1.- What does mean "Nominal" Fuel Flow[/i] ?
2.- What does mean the "USG" acronym when Boeing talks about Fuel Density 6.7 lb / USG ?
3.- Is there some relation between density and fuel quality?

Thanks in advance  Smile


Time flies! Enjoy life!
5 replies: All unread, jump to last
 
User currently onlineSEPilot From United States of America, joined Dec 2006, 6896 posts, RR: 46
Reply 1, posted (7 years 5 months 3 weeks 2 days 17 hours ago) and read 6298 times:

Quoting SKY1 (Thread starter):
1.- What does mean "Nominal" Fuel Flow[/i] ?

For nominal read average.

Quoting SKY1 (Thread starter):
2.- What does mean the "USG" acronym when Boeing talks about Fuel Density 6.7 lb / USG ?

U. S. gallon

Quoting SKY1 (Thread starter):
3.- Is there some relation between density and fuel quality?

Fuel density varies with temperature; has nothing to do with quality.



The problem with making things foolproof is that fools are so doggone ingenious...Dan Keebler
User currently offlineSKY1 From Spain, joined Apr 2006, 879 posts, RR: 4
Reply 2, posted (7 years 5 months 3 weeks 2 days 15 hours ago) and read 6282 times:

Thank you, SEPilot.

Then, a Fuel Density of 6.7 lb / USG is an average/medium density on an average temperature?



Time flies! Enjoy life!
User currently offlineZeke From Hong Kong, joined Dec 2006, 9027 posts, RR: 75
Reply 3, posted (7 years 5 months 3 weeks 2 days 14 hours ago) and read 6273 times:

Quoting SKY1 (Reply 2):
Then, a Fuel Density of 6.7 lb / USG is an average/medium density on an average temperature?

SG changes with the type of fuel and temp, 6.7 lb / USG works out to an SG of 0.8 kg/l, anywhere between 0.77 and 0.83 can be seen when you purchase fuel.

In asia a SG around 0.78-0.79 kg/l is normal, so with a capacity of 241,619l on the 748i, and SG of 0.78 would give a fuel load of 188462 kg, with a SG of 0.8 it would be 193295 kg, which means a range reduction of 4833 kg, or around 20-30 minutes, or around 200-250 nm less range.



We are addicted to our thoughts. We cannot change anything if we cannot change our thinking – Santosh Kalwar
User currently offlineSCAT15F From United States of America, joined Feb 2007, 402 posts, RR: 0
Reply 4, posted (7 years 5 months 3 weeks 2 days 5 hours ago) and read 6215 times:

I find it strange that maximum structural payload is listed as 295,000 lb for the airport compatibility brochure when everywhere else it is listed as 308,000lb.  Confused

User currently offlineSunriseValley From Canada, joined Jul 2004, 4952 posts, RR: 5
Reply 5, posted (7 years 5 months 2 weeks 6 days 17 hours ago) and read 6076 times:

Quoting SCAT15F (Reply 4):
find it strange that maximum structural payload is listed as 295,000 lb for the airport compatibility brochure when everywhere else it is listed as 308,000lb.

Uum... if you are referring to the freighter it shows in the January 2007 version of the airport compatibility brochure as 295400lb. The passenger version shows as 168300lb. No doubt there were other values for earlier iterations of the 747-8.


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