Honeywell B757
Thread Starter
Join Date: Jan 2013
Location: Birmingham
Posts: 153
Likes: 0
Received 0 Likes
on
0 Posts
Honeywell B757
An interesting arrival into BHX this evening.
The Honeywell B757-200(N757HW)test aircraft has just landed.
Anyone have any idea why it is at BHX and what is it currently testing??
The Honeywell B757-200(N757HW)test aircraft has just landed.
Anyone have any idea why it is at BHX and what is it currently testing??
Not quite. It has a stub wing/pylon that has in the past been used to mount various Honeywell engines for flight testing, including the TFE731 and (in the photo) the AS907/HTF7000 series:
Although I don't think it currently has a test engine installed.
Although I don't think it currently has a test engine installed.
Join Date: Sep 2010
Location: earth
Posts: 1,341
Likes: 0
Received 0 Likes
on
0 Posts
As an avionics tech there is nothing more frustrating than a system designed on precedent and theory, test flown a few times then mass produced. I do not know how many times I have had a bonehead engineer on the phone with nothing better to say than "I do not understand why it is doing that"! They use an operator to test and help them wring out the problems with the crap system they designed.
Ok rant over... It pleases me to see Honeywell putting the extra effort into R&D, they have a good reputation. This aircraft is probably primarily used for engine development, you can not completely simulate environmental conditions to test an engine in a test cell.
GE and Boeing both operate a 747 for this purpose, the GENx engine for the 777x is the last I have heard of undergoing test flight.
Ok rant over... It pleases me to see Honeywell putting the extra effort into R&D, they have a good reputation. This aircraft is probably primarily used for engine development, you can not completely simulate environmental conditions to test an engine in a test cell.
GE and Boeing both operate a 747 for this purpose, the GENx engine for the 777x is the last I have heard of undergoing test flight.
N4790P
grounded27
Really? I'm intrigued. In what area?
Of all the (Avionics) manufacturers we deal with Honeywell are by far the worst in just about everything.
Obviously I'm missing something!
they have a good reputation.
Of all the (Avionics) manufacturers we deal with Honeywell are by far the worst in just about everything.
Obviously I'm missing something!
I'm totally amazed at those engine mountings.
Must I assume from the pic above that the top of a 747's bubble is strong enough to take the asymmetric thrust of an extra engine. or will there be some structural work inside?
Why ever would you want to test an engine like that when the empty 747 could manage perfectly well on three engines regardless of whatever's being tested?
Why wouldn't the front, top mounted engine muck about with the tailfin?
Must I assume from the pic above that the top of a 747's bubble is strong enough to take the asymmetric thrust of an extra engine. or will there be some structural work inside?
Why ever would you want to test an engine like that when the empty 747 could manage perfectly well on three engines regardless of whatever's being tested?
Why wouldn't the front, top mounted engine muck about with the tailfin?
GE and Boeing both operate a 747 for this purpose, the GENx engine for the 777x is the last I have heard of undergoing test flight.
GE actually has two 747 test aircraft - one real early 747-100, and a newer 747-400 that they recently refurbished into a flying test bed.
One of the GE 747s is being used for the CFM LEAP engine (737 MAX/A320 NEO), the other will soon start flying with the GE9X engine for the 777X.
Must I assume from the pic above that the top of a 747's bubble is strong enough to take the asymmetric thrust of an extra engine. or will there be some structural work inside?
As C52 said asymmetry may pose an interesting challenge? Particularly with a potentially longer thrust arm with the test engine being mounted fairly far forward.
In the case of the latter, I can't see there being much problem as the GTF is no further outboard than No 2/3 engines, and producing much less thrust.
