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Dennis Johnson
Joined: 10 Jan 2006
Posts: 89
Location: N. Calif.
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 Posted: Mon Jun 16, 2008 5:52 am Post subject: Speedbrakes |
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Hi Jon,
I think the Precise Flight speedbrakes do best with an ON/ON switch. An ON/OFF switch works, because the controller will make the speedbrakes slam closed whenever power is removed, but they slam closed with a fair amount of force and I can't think that's good for the long term. An ON/ON switch allows them to be powered closed, which is a smooth, elegant, operation.
By the way, someone mentioned the problem of asymmetric extension of the speedbrakes. The Precise Flight controller has sensors and logic circuits that make that unlikely. If it senses that one side is extended (or retracted) more than the other, for some minimum length of time, it automatically closes them both, using the "slam closed" method, which I think is driven by a strong spring. However, the Legacy is reported to be fully controllable with one fully extended and the other fully retracted.
I'm sure you can use a "hat switch" to control them, possibly through relays, but I'd encourage you to make sure it's unlikely that you or a passenger could activate the switch by mistake. The speedbrakes are pretty effective and unplanned activation could be distracting for a couple of seconds while you were trying to figure out what the heck is going on.
My switch is on the end of my left hand throttle, in a place I thought was immune to accidental activation. I inadvertently activated mine twice during my fly-off test phase, when I was learning how everything works. The airplane is fully controllable and it's really not an issue, but it can be a distraction.
Speedbrakes are not required and they're expensive and heavy, but they are so cool.
Good luck,
Dennis Johnson
Legacy, 135 hours
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mlas(at)cox.net
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| Posted: Mon Jun 16, 2008 6:39 am Post subject: Speedbrakes |
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I used a three position switch for the speed brakes on my Legacy. Center off, momentary on, switched on. That way you can have the best of both worlds. The one word of caution is to have a power switch separate from the control switch. Sometimes switches get hit on the stick unintentionally. You would not want the speed brakes to come out during take off and in my experience you wouldn’t notice right away.
Regards,
Mike
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