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Tracking ---------- old days
boB wrote: Stuart & Kathryn Fields wrote: boB. I believe that the 1/rev vertical is due to tracking, and on my ship, I either stick track for a ground check or use tip lites. Note us experimental guys have a blade tip mounted LED two different colors, and we can use these tip lites in forward flite. One person tracking is possible. I had forgotten tip lights. On the OH-6 we had cat-eyes but all white reflectors with a different slash in each reflector (- | and /). I tried those (2 of them) on an OH58 but didn't have a bright enough light. I had to do the tracking after dusk. I also check the vertical vibration by using an accelerometer mounted down by the passengers pedals. Even when I do vertical 2/rev, measuring in the same spot, I don't get any significant readings. However measuring the horizontal 2/rev just below the swash plate, I can get some significant readings when my fuel level gets below 1/2 tank and I can feel it in the seat and controls. It seems that all of the Baby Belles exhibit this phenomena to some extent. Measurements on the Rotorway Exec showed similar readings but for some reason their vibrations don't enter the cockpit. I'm curious as to the sources of 2/rev vibrations. The two mentioned with Don W I know about and not a lot can be done to either of these two sources, but are there more sources? My experience is limited at best with only the aircraft I flew in the Army. But I'm hoping someday to be back in the air and I'm interested in what comes from this discussion. One of the aircraft I had high on my list was the Mini 500. Thanks to this newsgroup I've lined through that one. Write 'helicycle' instead. |
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