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3 blade vs 2 blade

 
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aslsa.rng(at)gmail.com
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PostPosted: Sat Sep 19, 2009 8:23 am    Post subject: 3 blade vs 2 blade Reply with quote

Apparently my nervousness at testing the new prop led me to not notice just how much more vibration was being generated. I put the three blade back together yesterday and flew it this morning. Smoother. No measure of how much, just a seat of the pants measurement. Almost all the tach problems went away. There is still some oscillation of the needle at certain RPM's but nothing like before. 
I think the 7 hour old plugs are fouling a bit as the idle is getting rougher. I'll put in new plugs and drop the needles one groove and see how the next set of plugs does and if all tach problems go away.
On the flight testing program I validated what others have said here, that the Mk III will not do a departure stall. At least I couldn't get it to do one. I had the nose up so high it would have made the space shuttle proud. All I could get was a vibration caused, I assume, by the flow separation at the wing root that came and went as the flow separated and reattached at 37 mph IAS. Another data point to put in the log book.
Okay, out to change plugs and go up again before the storms arrive.
Rick Girard

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John Hauck



Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

PostPosted: Sat Sep 19, 2009 10:49 am    Post subject: 3 blade vs 2 blade Reply with quote

Rick G/Gang:

Most every Kolb I have flown will climb with the stick full back to the stop, if it has any guts at all. Most of the time it will do it with two aboard with a mkIII.

A good exercise to stay ahead of the airplane would be full power climbs with the stick full back (at a safe altitude, of course), then chop the throttle (to simulate engine failure), and see how long it takes to get the nose down or recover from the stall, if that should happen.

john h
mkIII
Rock House, Oregon


[quote] On the flight testing program I validated what others have said here, that the Mk III will not do a departure stall.

Rick Girard

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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama
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