On Apr 20, 6:38*am, wrote:
On Apr 20, 7:52*am, wrote:



On Apr 20, 12:05*am, Darryl Ramm wrote:

On Apr 19, 3:53*pm, wrote:

On Apr 19, 1:51*pm, wrote:

I've have a Cambridge 302 in my glider. *I have the setting at 0%
since I have the total energy probe fed into it, along with the pitot
tube and static port. *The te tube is split just behind the cockpit as
recommended. *The static and pitot are split or "t'd" behind the
instrument panel.

When I push hard forward to increase airspeed.....the cambridge VSI
goes up to 10knots positive.

Then when I pull back to bleed off airspeed.....the VSI goes down to
10 knots negative.

The manual says to increase the % , but doesn't say how much.

Another option is to not use the te tube and put it at 100%.

The te probe in my glider is located about 6 feet behind the wing spar
on the top of the fuselage. *It's not the conventional spot on the
rudder.

Any thoughts? *Recommendations?

Scott,

Go to screen 10 on the CAI 302 and note *the indicated airspeed. *You
may have the Pitot & static switched. *Which mode are you in when this
happens climb or Cruise?

At TE probe requires that the Compensation be set at 0%. *The Probe
supplies the Compensation.

Richardwww.craggyaero.com

And that was a clever suggestion - pitot and static swapped and the
302 in cruise mode and configured to be a super netto or netto vario
so the indicator relies on the airspeed....

Note to Scott - the altimeter display on the 302 home screen has
nothing to do with the static plumbing, it senses cockpit ambient
pressure, so is cannot help debug this question. So try what Richard
suggests.

Darryl

If that turns out not to be the problem a simple pressure check for
leaks is in order.

9B- Hide quoted text -

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The pitot/static lines are correct. *There is no leaks in the system.
All the lines and capacities are brand new now.

The Airspeed on page ten indicates correctly. *It's within a couple
knots of the mechanical airspeed indicator adjacent to the cambridge.

My question is, how much %? *The manual address this issue by
stating..."increase the % if this is happening".....but doesn't say
just how much.

I guess I can just try 10%, then 20%, then 30% and so forth. *But
would much rather have a more educated attempt at setting this the
right way.

Electronic adjustment to TE compensation when I've tried it is a few
percent at most. TE probes should work very well. What you are
describing sounded like a significant problem, not something you tweek
electronic compensation to a TE for. You seem to be confident you
don't have any problems - you know you have no leaks - you have done a
leak-down test on all the lines? All your mechanical varios work
correctly right? They show climb etc. when they readings and readings
match (and they have separate capacities T-ing off behind the seat...
if they don't match then that might help show if one of the varios
themselves are leaking etc.)...

Have somebody else check your work. Try the static line at 100%
compensation. If that does not work send the 302 to Cambridge for
repair or try swapping with another to see if that works.

Darryl