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Fish tailing

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Paul Holmes 225/06/2019 16:04:30
23 forum posts

What causes a model to fish tail in flight and what can be done to stop it?

Jon - Laser Engines25/06/2019 16:10:10
4765 forum posts
179 photos

Depends on the situation and what exactly you mean by fish tail. In turns a low tail can be cured with some rudder input but if your model develops a tail wag at high speed this is likely just a trait of the model. My La7 will wag its tail if i fly at high speed in the sort of turbulent air you get on a hot day. Apparently the full size did this as well so its just the way it is

Martin Harris25/06/2019 16:12:34
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8728 forum posts
214 photos

Often a symptom of too small a fin/rudder area but could be due to flexibility in the construction or slop in the linkages. A "modern" cause could be too much gain on a stabilised control surface.

Edited By Martin Harris on 25/06/2019 16:13:16

Don Fry25/06/2019 16:20:51
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3816 forum posts
42 photos

I think you are talking about Dutch Roll. It's part of the design of that particulat aircraft. Wikipedia will explain. Bit complicated for me and a number of causes and cures. My Vampire does it at its cruising speed.

Edited By Don Fry on 25/06/2019 16:21:22

Gordon Whitehead 125/06/2019 17:28:56
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312 forum posts
120 photos

Beb answered the same query in this thread: Fishtailing - causes and cures

Gordon

Old Geezer25/06/2019 23:52:27
603 forum posts

BEB's contribution explains why some of the later artf's have rudders that haven't been tapered, in the way we were all encouraged to build in the good old days. There was me thinking "idle beggars - couldn't be bothered to sand a taper into the rudder, even though they'd done it for the elevators and ailerons".

So a silent apology to those teams of Vietnamese and Chinese workers who assemble our toys for us.

But, similarly, silent prayer that their designers take into account the average less than billiard table smooth UK patch and design in stronger u/c mountings that won't allow said u/c to be wiped off under the loads imparted by the first less than perfect landing.  (Sorry - just an axe I've been grinding ever since I bought my first artf! )

Edited By Old Geezer on 25/06/2019 23:56:34

Edited By Old Geezer on 25/06/2019 23:57:39

Edited By Old Geezer on 25/06/2019 23:58:30

Tom Sharp 226/06/2019 00:22:35
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3458 forum posts
17 photos

I think climbing high up to a stall turn then doing a bit of fishtailing on the way down looks rather smart.

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