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"ContestID67" wrote in news:1143413733.258492.60400
@i39g2000cwa.googlegroups.com: I have a Winter variometer that works great except that at rest it reads high (+1.5). While that makes me feel good in flight, I'd rather zero the thing out. The question is how to do this. I have been told two different ways to do this; 1) Find the zero adjustment - I removed the face plate but cannot find the adjustment. Any ideas? 2) One person mentioned that over time the needle looses weight. Because these devices are so sensitive the needle reads high. The idea then is to add back the lost weight. This person recommended a small dab of finger nail polish. The last choice is to send it back to the factory which I would rather avoid. Thanks. Had this issue last summer - turned screw - easy - no problems. -- Roger Kelly to reply replace the IP address above with ceressenior.com *** Free account sponsored by SecureIX.com *** *** Encrypt your Internet usage with a free VPN account from http://www.SecureIX.com *** |
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To give you an update on my process and success.
I used nail polish. On the Winter there is a cover (with the model and serial number) which can be swung out of the way after loosing a screw. I put the nail polish under that. The reasoning was that 1) the cover will hide the polish and 2) placing a weight closer to the center requires more weight to do the job (shorter moment arm). Thus, I have more control over what I am doing. It did take several coats as each coat dries and looses weight. The trick was to determine if what I added was correct. I did the following; 1) Added some nail polish with a toothpick to make the needle go to zero. 2) CAREFULLY blow into the static and/or TE probe line fittings to reset the needle. NEVER BLOW DIRECTLY INTO THE INSTRUMENT as this is a very delicate instrument. What I did was hold the vario facing me, then cupped my hand behind the vario, the GENTLY blew into my hand. This deflected a bit of air into the probe line fitting and deflected the needle. Hold the vario as it will be in flight, face held vertical. 3) Let the nail polish dry and use step 2 again to see if the needle rests at zero. 4) Repeat these steps as necessary. Good luck. - John |
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