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Author Topic: What causes the wiggle effect ?  (Read 1537 times)

Offline Rosie Rosenau

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What causes the wiggle effect ?
« on: January 11, 2015, 03:28:49 PM »
Simply put my electric 1/2a's wiggle or waggle when I start a maneuver. Once I go flat it calms down or if I continue through the maneuvers it calms down some. I will take a shot in the dark and say my lead outs need to come back farther or my rudder is off set to much or finally I need to add weight to the out board wing?  So team what are the words of knowledge you can provide this wayward pilot... Not a farmer! Lol I been plowing way to much lately.

P.S. The new electric Stork is perfect. Nice to know I can still fly and keep one in the air.
Thanks in advance team
Tally Ho!
Rosie
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Richard "Rosie" Rosenau Jr, Yelm WA, USA

Offline Douglas Ames

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Re: What causes the wiggle effect ?
« Reply #1 on: January 11, 2015, 05:17:51 PM »
I'm going to take a guess that it's prop precession. (gyroscopic forces) acting on a light airframe (1/2A size).

Search- "Rabe Rudder"
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Offline Rosie Rosenau

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Re: What causes the wiggle effect ?
« Reply #2 on: January 11, 2015, 11:21:12 PM »
Prop viewed from the front turns clockwise. I do have a reactive rudder. IE I installed two small baby diaper safety pins opened up. I give it a fair bit to the outside. Less than 1 inch. The faster it goes the straighter she gets. The mini magician has a small 27inch wing and weight in like a FAT HOG at just over 570 grams. So it does not glide instead she drops like a rock but not as bad as my Swordmans.

Does that still sound like a rabe rudder candidate????
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Richard "Rosie" Rosenau Jr, Yelm WA, USA

Offline Dan McEntee

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Re: What causes the wiggle effect ?
« Reply #3 on: January 12, 2015, 12:33:56 AM »
Quote from: Rosie Rosenau on January 11, 2015, 11:21:12 PM
Prop viewed from the front turns clockwise. I do have a reactive rudder. IE I installed two small baby diaper safety pins opened up. I give it a fair bit to the outside. Less than 1 inch. The faster it goes the straighter she gets. The mini magician has a small 27inch wing and weight in like a FAT HOG at just over 570 grams. So it does not glide instead she drops like a rock but not as bad as my Swordmans.

Does that still sound like a rabe rudder candidate????
   If the prop is turning like you describe, dis-able the Rabe rudder and see how it reacts.You may simply be over controlling the model also and if it's a bit heavy this will react this way, or maybe even stiff controls. On smaller model, a narrower line spacing will help with too much leverage at the handle.Larry Renger came up with a handle specifically for 1/2A models and I think RSM Distributing sells it. You might want to check that out.
  Type at you later,
   Dan McEntee
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Online Larry Renger

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Re: What causes the wiggle effect ?
« Reply #4 on: January 12, 2015, 08:05:48 AM »
It sounds like a tip weight problem to me. Do a quick, vertical climb and level out as in the first Old Time maneuver. If the outboard t drops on the turn up and kicks up on the level out, you have too much tip weight.
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Offline bob whitney

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Re: What causes the wiggle effect ?
« Reply #5 on: January 12, 2015, 09:00:56 AM »
what Dan said  ,sounds like too much control and piviting on the lines
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Offline Tim Wescott

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Re: What causes the wiggle effect ?
« Reply #6 on: January 12, 2015, 12:07:19 PM »
Which way would weird wiggle wag?  Pitch?  Roll?  Yaw?  Some bizarre combination of all three?  Each has a (more or less) different cause.
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Offline wwwarbird

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Re: What causes the wiggle effect ?
« Reply #7 on: January 12, 2015, 06:10:57 PM »

 Wiggle effect? You mean with airplanes?
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