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Fergus Kyle
Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada
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 Posted: Mon Jun 28, 2010 8:38 pm Post subject: Speed Brakes/Spoilers |
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One of us has it right (IMHO). The spoiler cancel switch should be on the throttle. The TriStar was a whiz in cockpit design. There were four different kinds of spoilers on the wing.
The first were big jobs inboard to plop the aircraft onto the tires on touchdown because you could round out, put only five of eight mainwheels on, catch a drift and touch brakes would blow out the tires on the runway – so the full weight was required to save tires – called GROUND SPOILERS. The second were roll augmenters and “speed brakes” in the air but accompanies the biggies when the touchdown was complete, the third types were outboard to balance fuel tank contents on an “active” wing (called ‘direct Lift control’ – don’t ask) and I can’t remember the 4th, but three of the four assisted in roll. The speed brakes could only be selected in air with no flap out – they were then effective bakes.
So, you can call ‘em speed brakes only if they operate to increase drag – that’s how the are engineered into the wing. Just to complicate it, there were mixers which decided if your selection was (a) acceptable and (b) possible.
The crux was on the throttles (4). The oputer ones had outside buttons in parallel, so were called GO AROUND buttons. If Cap’n was flying he used the No1 throttle button, if the F/O was doing it he had the No4 throttle button. When you wanted to abort the approach, you hollered “Go around”, pushed the GA button on your side as you opened the throttles to GA power. The approach was made with some spoiler panels partially extended. The button [1] demanded a proper nose-up pitch, [2] cancelled the extended spoilers instantly which allowed the aircraft to ‘leap’ upward and [3] did a number of complicated things which made aborting an approach magic and instantaneous. No other a/c could do this and it meant (very early in the trade) approaching to 7 feet (wheel height) from the runway and not drop a foot farther – without ever seeing the ground. And 90% of the exercise was aerodynamic – a miracle. Let’s hear it for partial spoilers.
I suspect the throttle is the ideal place to cancel spoilers/speed brakes because you are probably going to want to increase speed or improve lift – and now.
I have to close, I hear matron coming down the hall.
Ferg [quote][b]
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Fergus Kyle
Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada
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| Posted: Wed Jun 30, 2010 11:40 am Post subject: Speed Brakes/Spoilers |
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Sorry, I sent a diatribe to the wrong group. I apologise.
Ferg [quote][b]
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grahamsingleton(at)btinte
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| Posted: Wed Jun 30, 2010 1:12 pm Post subject: Speed Brakes/Spoilers |
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Fergus
no wonder I couldn't find the question! Nevertheless, very interesting stuff and well worth reading.
Graham
From: Fergus Kyle <VE3LVO(at)rac.ca>
To: 5EUROPALIST <europa-list(at)matronics.com>
Sent: Wednesday, 30 June, 2010 20:31:06
Subject: Speed Brakes/Spoilers
Speed Brakes/Spoilers
Sorry, I sent a diatribe to the wrong group. I apologise.
Ferg [quote]http://www.matronics.c==================
[b]
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