Spoiler arm auto-deployment

[vidarf]

Hi gents!

I've been playing around with my LEGO Mindstorm-set (don't act like you don't envy me!). I've been thinking about the spoiler arm deployment / retraction. On the 737, the spoilers are automatically deployed upon ground contact or in the event of a RTO. Should a go-around be initiated after landing and the spoilers are up, they will automatically be retracted. This is something I want to add to my TQ.
So here's the idea:
http://www.mycockpit.org/photopost/s...php?photo=3899

In short, this solution will automatically raise the spoiler arm from the down detent, and then depoy the spoilers. The secret is a bell-cranck, which is a L-shaped contrapment that transfers horizontal movement into vertical movement (other uses are possible too).

The important thing to achieve here, is that there should be a bit of "play" in the linkage from the servo / motor to the spoiler arm to remove the load of movement.

Any comments, suggestions and improvements are VERY welcome!

[dnoize]

Nice build....we all love LEGO mindstorm....well, i do....

but:

Spoilers only auto deploy after they have been armed (armed detend). That means you allready raised and armed the lever manuallyin case of autobreak.
No auto raise from the down detend for the speed brake lever.

Stef



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[vidarf]

Are you sure? Doesn't the spoilers deploy if a RTO occurs?

[Trevor Hale]

On the Airbus, the Spoilers are armed before take off for an RTO situation,

But in the Boeing.. I have never seen arming the spoilers as part of the pre-takeoff checklist.

Trev

[vidarf]

That's my experience also - not in any of my DVD's or in the two jumpseat-rides I got. I don't know if the spoilers deploy during a RTO, or if the pilots have to do it manually.

[dnoize]

From the Quick Reference Handbook that KLM uses:

Before start:

* AUTOBRAKE........................RTO
* SPEED BRAKE........DOWN DETENT

from Bill Bulfers book:

AUTO BRAKE SELECT SWITCH
-used to select te RTO or the desired deceleration rate of auto braking after landing
-landing mode selection equals total deceleration (thrust reverse plus braking)

also, when armed, flight spoilers come up at wheel spinup on any 2 main wheels.
ground spoilers come up when mechanical squat switch on right gear is compressed.




Stef




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[ivar hestnes]

I took some shots from my QRH to enlighten this. On a RTO takeoff, the speedbrakes is raised manually.

[dnoize]

Are you sure? Doesn't the spoilers deploy if a RTO occurs?

nope...

has to be done manually.....

see my posts for before take off....

and ivars post for the RTO


Stef

[vidarf]

Great, thanks guys! This made the whole idea of mine MUCH more simple! Now I can skip the whole contrapment and use a simple switch to cut power to the motor if the spoiler arm isn't raised and armed.

This right here is the great thing about forums like this: You ALLWAYS find an answer!

Ivar, if you have one of those QRH laying around as a leftover...

[ivar hestnes]

haha, you wish

I actually had one more set, but Svein got that one. Sure he wont sell it