Without studying the circuit in great detail, I can say that I installed an "air switch" into GOA so that whilst the engine is running the vario can be driven from static pressure inside the cockpit. No compensation but it avoids the chaotic movement of the needle that arises from having the jet efflux (prop wash) impinging on the tail mounted TE probe and since one is flying at a constant speed it is useful in establishing oneself in lift. The biggy is that one is taking one's signal from CP of +1, and when one switches back to the normal TE, one is switching to a CP of -1. A violent thing to do to one's vario, particularly the good ole Winter. So violent that I have stopped doing it until I can find a way to damp things down. I cannot think of a way to damp out the event without putting an unwanted restriction in the TE line. Ideas? All the best, Paul
On Tue, Jul 30, 2013 at 10:43 AM, Mike Borgelt < [email protected]> wrote: > Please treat this an opportunity to learn. > > I got the attached diagram from someone in another country who traced the > instrument plumbing installed in his motorglider. > The air switch is so the varios can be run uncompensated when the motor is > extended and running. > Variometer performance is described as "not optimal". > > What is wrong? > > If anyone cares to comment on this with private replies I'll put together > a de-identified digest of the replies in a couple of days. > > Mike > > > > > > ** > > ** *Borgelt Instruments* - *design & manufacture of quality soaring > instrumentation since 1978 > * www.borgeltinstruments.com > tel: 07 4635 5784** **overseas: int+61-7-4635 5784 > mob: 042835 5784** **** **: int+61-42835 5784 > P O Box 4607, Toowoomba East, QLD 4350, Australia > > _______________________________________________ > Aus-soaring mailing list > [email protected] > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring >
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