Noob question: Turboprops = turbine time?
05-31-2009, 08:57 PM
#22
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Before someone runs off and starts logging DA-42 as turbo-prop time ("But I saw somewhere on the internet I could do it"), I bow to SunDog's superior wit and retract my earlier statement.
The FAA has a list in AC61-89 which planes are centerline thrust. It gets down to the point the T-37 is, the A-37 isn't.
The FAA has a list in AC61-89 which planes are centerline thrust. It gets down to the point the T-37 is, the A-37 isn't.
05-31-2009, 11:47 PM
#23
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Really? Wow, never knew that. Out of curiosity... how does that work? I mean physically looking at the aircraft, there are clearly two engines on either side of the longitudinal axis so there would be SOME yawing moment if one engine died. Obviously due to the closeness of the engines, it would be small. Is that the only reason why?
I wonder if the AC has been updated recently. They specifically mention the F/A-18A as having the CLT limitation, but not other models. I know that they said that the F-14's engine were far enough apart, but I wonder what the reason for the A-37 is for not having the restriction other than lbs thrust; but then other aircraft certainly have have powerful engines it would seem with more arm between them (A-10?)
USMCFLYR
Last edited by USMCFLYR; 06-03-2009 at 04:51 PM.
06-01-2009, 06:44 AM
#24
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It hasn't been updated for several years. That's what I've heard, that the higher thrust engines on the Dragonfly make it a "normal" twin while the T-37 has the CLT limitation. The suprising one to me is the A-10, just looking at it I'd think it was "normal."
06-03-2009, 10:10 AM
#25
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This is what he said back 10 yrs ago when I was in the airforce (FAC colombian air force) mmmm wish I had graduated instead of quitting ... anyways my 2 cents
DADA
06-17-2009, 03:55 PM
#26
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I am guessing the same for the T-38?
But then, wouldn't something like a citation or even 727 be considered centerline thrust? the rudder is between the engines but there really isn't anything to produce adverse controls since there is no fuselage behind the engines no?
I am have just started ME training so this is really interesting.
But then, wouldn't something like a citation or even 727 be considered centerline thrust? the rudder is between the engines but there really isn't anything to produce adverse controls since there is no fuselage behind the engines no?
I am have just started ME training so this is really interesting.
)Edit: Obviously except when it's the #2 engine...
06-17-2009, 04:55 PM
#27
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06-17-2009, 07:35 PM
#28
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If Vmc is below stall speed at all weights, then it is centerline thrust. If at any weight, Vmc exceeds stall speed, then it is not centerline thrust. The A-37 has significantly higher thrust than the T-37, therefore at low weights Vmc might be higher than stall speed.
Joe
Joe
06-18-2009, 07:16 AM
#29
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A pod would just take a couple of units of trim, not too much.
06-18-2009, 09:56 AM
#30
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I wouldn't call it "adverse yaw" since the yawing moment is not caused by the generation of lift. Was doing a two engine ferry off BOS a few years ago. You have to note it in the remarks and tell the tower before departure. We get handed off to BOS Departure and they say they understand we have an engine shutdown and want to know which one so they'll know which way to turn us. I look over at the F/O, shrug my shoulders, smile and reply, "It's number 2."
A pod would just take a couple of units of trim, not too much.
A pod would just take a couple of units of trim, not too much.
That's a good one to have shut down for sure!!! Wonder if the controller turned a little red after that, or did they even know.
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