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CRAF 747F range performance?

Posted: Fri Apr 23, 2021 3:26 am
by UA857
Boeing lists the 744Fs range as 4,450 nm. However once on a blue moon, an Atlas Air 744F would be seen on an AMC CRAF contract flight from Travis AFB (SUU) - Frankfurt-Hahn (HHN) nonstop. Do CRAF 747Fs have any extra fuel tanks that increase the range performance or do they just carry less cargo on these missions?

Re: CRAF 747F range performance?

Posted: Fri Apr 23, 2021 3:54 am
by Starlionblue
They would just carry less cargo.

Range as stated by the manufacturer is only a ballpark/guideline/marketing tool. In the real world, range changes for every flight given environmental conditions, en route winds, runway length, payload, drift down considerations over high terrain, and so forth.

Looking at the range/payload graph on page 58 of the 747-400 airport planning doc, you can see that the maximum range is almost 8000nm. https://www.boeing.com/resources/boeing ... /747_4.pdf

Re: CRAF 747F range performance?

Posted: Fri Apr 23, 2021 5:23 am
by UA857
Starlionblue wrote:
They would just carry less cargo.

Range as stated by the manufacturer is only a ballpark/guideline/marketing tool. In the real world, range changes for every flight given environmental conditions, en route winds, runway length, payload, drift down considerations over high terrain, and so forth.

Looking at the range/payload graph on page 58 of the 747-400 airport planning doc, you can see that the maximum range is almost 8000nm. https://www.boeing.com/resources/boeing ... /747_4.pdf


Are they weight restricted then?

Re: CRAF 747F range performance?

Posted: Fri Apr 23, 2021 5:29 am
by Starlionblue
UA857 wrote:
Starlionblue wrote:
They would just carry less cargo.

Range as stated by the manufacturer is only a ballpark/guideline/marketing tool. In the real world, range changes for every flight given environmental conditions, en route winds, runway length, payload, drift down considerations over high terrain, and so forth.

Looking at the range/payload graph on page 58 of the 747-400 airport planning doc, you can see that the maximum range is almost 8000nm. https://www.boeing.com/resources/boeing ... /747_4.pdf


Are they weight restricted then?


There's really no way to tell without more information.

SUU-HHN is 4881nm. Call it 5000 with departure and arrival manoeuvering. Just from the graph in the airport planning doc, they would be slightly restricted. But that's in ISA conditions with nil wind and not runway restricted.

Winds are a huge factor over such distances. 4881 air miles can become 4300 ground miles if the wind is in your favour.

Again, there are many factors to consider. Either way, in most cases the payload is not maxed out so much that you run into MTOW issues.

Re: CRAF 747F range performance?

Posted: Fri Apr 23, 2021 1:55 pm
by GalaxyFlyer
Heck, it could be an empty positioning flight. Using brochure range is not useful, you need a flight planning and flight details.

Re: CRAF 747F range performance?

Posted: Tue Apr 27, 2021 2:43 am
by flyDTW1992
I've worked for two CRAF 747 carriers, in my experience the vast majority of AMC charters aren't anywhere close to topping out weight-wise. Many are closer to half a 744's max payload.