lcottrell
Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or
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 Posted: Sun Feb 21, 2016 3:00 pm Post subject: AOA revisited |
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Well the runway finally dried out and the wind momentarily quit blowing, and I ran out of excuses. I rolled the plane out and went out to do some touch and go'es and I took some videos of the basic AOA indicator, and will work on organizing them later.
I wanted to find out how much movement there would be from level flight, Wing at 9 degrees, and stall. I built a vane that was 5 1/2 inches long. Picture is attachment "aoa 1". I then put a piece of tape on the inside of the wind screen marked by inches. I located this entire set up on the wrap around wind screen just in front of my knee, figuring that I could see it out of my perifial vision while I was checking the ASI. It was visible to the eye, but not in a very good position to record on a video camera. Regardless of that I found that the plane flew flat and level at the 9 degree mark that I had put on the screen, and began to burble at a level that was 1 5/8 from that mark.
The only surprise was that I would rarely on purpose fly the plane that close to a stall. Of course I have about 655 hours on this plane so it is no surprise that I have developed defenses against screwing it up.
The things that I learned from this are:
That the plane will be very difficult if not impossible to stall at full throttle. At least it is very difficult for me to pull it up that much.
That the vane is not a necessity. a piece of yarn would do just as well, and while not as "swavey" as a lighted AOA, is just as visible.
Because of the design of the Kolb, there is very little time and not enough inertia for one to fool around when approaching a stall, and be able to recover before something bad happened. An 11 inch piece of yarn would be showing 3 1/4 inches approaching burble. The yarn would also eliminate the problem of some yoyo messing with a metal vane. It would also give you enough warning that even approaching a stall would be quite obvious.
I was happy to learn that I didn't seem to be all that rusty even though I haven't flown for several months, and that I still enjoyed it. The tires as you may remember were secured with some expensive stainless steel 3/4 inch screws, 12 per tire. I put 6 pounds of pressure in them when I originally fixed the tires. One of my landings I was paying more attention to the AOA than landing and I dropped it from about a foot off the ground. The cushion was quite noticeable and not unpleasant. I am quite pleased and happy that I did it.
Larry
--
The older I get, the less tolerant I am of those who are intolerant.
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