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Angier,
I originally liked the idea of wiring one side of the switches together and using a push button to activate. Why both switches?
The problem with this is that it is not automatic.
Wolfgang's solution makes this concept fully automatic, with the motor running in the right direction, when you put the gear up and/or down. This is the way it should be.
To install Wolfgang's device, you just plug it into the pressure switches, tie rap it to the pump and go flying. There is no need to run wires or plumbing from the back to the front of the plane. There is also no need to monitor pressure switches to see if buttons need to be pushed. The device simply makes sure that the pump runs in the correct direction if both pressure switches are high.
By the way, both pressure switches should never be high at the sale time. The spool valve should stay to one side or the other. If that happened, everything would be honky dory. But is doesn't on all of the pumps. On some of the pumps, like mine, about every 10 to 20th flight, the spool valve must center itself. When this happens neither side feeds back to the reservoir and as the temperature rises the pressure builds. This, I believe, is what causes the gear to not come up or go down.
Lorn
From: "Greenbacks, UnLtd." <N4ZQ@comcast.net>
Date: April 9, 2010 4:53:14 PM EDT
So, would not the simple solution be to wire both sides of each pressure switch to a momentary push button switch?
I have gages installed and so can observe the hi/lo pressures. A push of the momentary switch should start the pump.
Angier Ames
N4ZQ
...moving ever closer to first flight...
--
Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,700 hrs, N31161, Y47, SE Michigan
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