NetHeads, Last night I removed my UMA VSI. Driving home from the airport, the thing seemed to work perfectly, indicating even the slightest changes in altitude. Today on the way to work, I cracked a car window to induce a negative pressure and it instantly showed a 500 ft/min climb. Messing around with the window, I could make it read anywhere between plus and minus 500 ft/min, for a few seconds anyway. When I parked, the thing just sat there on 300 ft/min. I watched it for a couple of minutes, and decided that's certainly a part of the problem. I called UMA and the guy said "just send it back with a description of the problem and we'll take care of it". No mention of payment, so off it goes tomorrow. Nice of 'em! Maybe I should have returned my altimeter to them too, rather than just buying a new one. It never hurts to ask.
I bypassed the VSI so tomorrow I'll flight test the "new" static system and see what I get. I've also hooked up a timer to limit my fuel transfer to 100 seconds (then it shuts off automatically), installed another kind of air/fuel meter (kluged into the shell of what used to be the worthless Tiny Tach), and moved the outside air temperature probe out into engine inlet so it can get an accurate indication (it has been under the cowling recording temps there). I'll finish it up tonight and fly again on Friday afternoon... Mark Langford, Huntsville, Alabama see KR2S project N56ML at http://home.hiwaay.net/~langford email to N56ML "at" hiwaay.net
