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Gyroscopic preccession?

 
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Richard Pike



Joined: 09 Jan 2006
Posts: 1649
Location: Blountville, Tennessee

PostPosted: Tue Sep 07, 2021 3:42 am    Post subject: Gyroscopic preccession? Reply with quote

Now that I finally have the 582 running properly with the 3.47:1 box and 72" 3 blade Ward Drive prop, I need to figure out how to deal with another oddity.

Back when I still had the 68" 2 blade Ivo, during takeoff roll in the MKIII raising the tail during acceleration was a non event, you just raised the tail and flew it off the ground.

Not any more. On several occasions, raising the tail causes the airplane to want to yaw right and drop the left wing, and on a couple occasions the only way to get it back under control was to chop the power.

Obviously I need to unlearn some old habits and learn some new ones.
Keep the tail on the ground until it gets up to x airspeed and there is enough control authority to outmatch the gyroscopic precession?
keep the tail on the ground and wait until it just flies itself off? It certainly feels like it has enough thrust to do this.
Go to a really big wide grass runway and carefully poke at it with a stick until I figure it out?

Open to suggestions. John? You had a 3 blade 72" Warp on your MKIII; what say ye?


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Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.
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jhauck



Joined: 02 Jan 2020
Posts: 21

PostPosted: Tue Sep 07, 2021 5:50 am    Post subject: Gyroscopic preccession? Reply with quote

Most MKIIIs with standard length gear legs sit level, or near level. Homer Kolb designed it this way primarily for low time pilots. Helps prevent premature takeoff, and it is more less apt to stall when slowing down to touch down and land.

The main gear on my MKIII was considerably longer and 6 or 8 inches further forward than a standard built MKIII. No matter. My MKIII or a standard built one, I normally made my take offs without raising the tail wheel. The excessive wing incidence didn't have a problem flying off the ground in the standard 3 point attitude.

More power means more nose down thrust from the high, pusher thrust line. Bigger props mean more thrust.

If it was me, I'd fly it off in its 3 point attitude. Keep playing with it to see what the aircraft wants to do.

Muscle memory is very powerful without realizing it. When I swapped from an 80 to a 100 hp Rotax, I couldn't get the MKIII to break ground at WOT my first takeoff. Quickly realized what was happening, came back on the power a bit, and she popped right off. Caught me by surprise. After the first takeoff I naturally compensated for the change in additional thrust.

john h
Titus, AL

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Richard Pike



Joined: 09 Jan 2006
Posts: 1649
Location: Blountville, Tennessee

PostPosted: Tue Sep 07, 2021 5:34 pm    Post subject: Re: Gyroscopic preccession? Reply with quote

Thank you John, that was what I needed to hear. Looks like I need to go flying tomorrow. <Grin>

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Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

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