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Post by jotel on Apr 14, 2008 6:32:42 GMT
Hi there,
I recently bought a book about the DC-8 and it says that it was quite common to use inflight thrust reverse to slow the DC-8 down during the descend. They used this practice till the -63 variants cause on the -71,-72,-73 it would cause too much vibrations with the new CFM-engines...
Is that true? After reading that I checked out the HJG Models and I couldn't deploy any Thrustreverse in the air... if this is true, is it somehow possible to add that to the HJG Models/Airfiles?
Regards
Johann
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Post by Dee Waldron - HJG on Apr 14, 2008 8:40:09 GMT
FS doesn't support thrust reverse when the weight is off the wheels (in flight). So its a limitation of the program, not the model.
Dee
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Post by kov on Apr 14, 2008 8:41:38 GMT
Hi Johann,
It should be true. Spoiler deployment in the air was prohibited on the DC-8. As far as i know it was used only on the inner or only on the outer engines (don't know which pair actualy).
Don't think that this will be easy to reproduce in FS because FS doesen't allow reverse deployment in the air.
Regards
Jakov
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Post by jotel on Apr 14, 2008 12:37:14 GMT
mmh I have a TurboProp Aircraft (Wilco A400M) where it is possible to use Inflight Reverse... so really no possibility to implent that in FS2004?
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Post by aerofoto - HJG Admin on Apr 14, 2008 13:16:18 GMT
Quite a few FS specialists have looked at this prospect for us over the past several years, but, as both Dee & "KOV" have already stated .... as far as our DC8's are concerned, FS does not support inflight reverse capability.
Inflight deployment of spoilers on DC8's is an absolute "NO NO". History records a couple of nasty DC8 accidents which resulted from inadvertant deployment of the spoilers in flight.
Inboard engines only .... # 2 and # 3.
Mark C
AKL/NZ
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Post by jotel on Apr 14, 2008 13:28:05 GMT
i see... thx for the info  |
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Post by kov on Apr 14, 2008 13:33:35 GMT
It works for props because reverse works with prop pitch there. So you can trick FS in telling it to move the prop blades past the feather position. You don't have this possiblity with jets.
Regards
Jakov
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Post by adrian19 on Apr 27, 2008 21:33:05 GMT
Hi All,
Concorde had inflight reverse as well on the inboard engine of each pair.
AFAIK the reason that it put only one engine out of each pair into reverse is because of a lack of bleed air at reverse idle, there being only enough from 2 engines for one pair of buckets.
SSTSIM seem to have managed to reproduce this in flight with their Concorde model !!
Regards
.............Adrian W.
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Post by christrott on Apr 29, 2008 4:34:48 GMT
They used the otherwise unused spoiler function to do that. As Concorde does not have spoilers or speedbrakes, that function is available to replicate the effect of the inflight reverse capability. With the DC-8 and most other aircraft that have spoilers, that effect is not necessarily available, although theoretically the spoilers are ground only on the DC-8 so if redesigned, the spoilers could be assigned to the wing fold (as they do with the lift dumpers the Project Fokker aircraft and several other aircraft) and the spoiler assigned to the inflight reverse "effect", but that would require a fairly extensive rebuild of the model to do.
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Post by aerofoto - HJG Admin on Apr 29, 2008 12:37:31 GMT
Thanks for that reclarification Chris !  Precisely what we can't do at this point of time .... I'm afraid !  Mark C BOG/CO |
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