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From: Lorn H Olsen <lorn@dynacomm.us>
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Subject: Re: gear retract problems - 320
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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
>=20
> 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.
>=20
> 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