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Old 06-17-2010, 12:08 PM   #1
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Westland Lysander

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I am building a Dennis Bryant 1/7 scale Westland Lysander. I need help on how to set up the tail wheel. On the plan, the tailwheel is fixed, I.E. it does not turn the plane. This is not acceptable for me. I see three possible options.

- Make it a steerable tail wheel with a servo.

- Make it a free wheeling tail wheel (like the real Lysander).

- Make it a free wheeling tail wheel AND use a a gyroscope linked to the rudder to control the plane during take off.

Any ideas, recommendations out there?

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Old 06-18-2010, 11:47 AM   #2
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Re: Westland Lysander

I have always thought the Lysander was a cool looking plane with remarkable perfomance. Functionally beautiful !?!? I was just reading a pilot report in an old issue of Flight Journal on what it is like to fly the Lizzie. It has a speed range from 60 to 300 knots (in a dive)! BTW, there is one flying in Hamilton now.

I would definitely recommend going with a steerable tailwheel as opposed to a fully castoring/free wheeling one. Being a taildragger, it is naturally unstable (ground handling-wise) with the CG behind the wheels. If you allow the tailwheel to castor, it can not provide any resistance to stop the tail swinging to the side. This also makes taxiing in a cross-wind difficult as the plane will just weatherock and self-align with the wind.

I would run a set of pull-pull lines to the tail wheel in parallel with your rudder pushrod. Then you just need the one servo. And the pull-pull lines weigh next to nothing. That is my 2 cents worth.

Good luck!
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Old 06-18-2010, 12:14 PM   #3
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Re: Westland Lysander

A castering tailwheel is the simplest solution, but it can make taxiing frustrating on a breezy day, especially with that great big behind that is on the Lizzie.

The best solution is a single servo and second pushrod (or pull-pull as j3 av8r suggests)

Another solution is to run a Y harness to a second servo on the tail, but if you are routing the pushrods/cables to the servo up to where the existing rudder servo is, why run a second servo? If you put the second servo close to the tailhweel, you need to consider access to the servo in case it ever craps out.
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Old 06-18-2010, 05:01 PM   #4
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Re: Westland Lysander

Hi denbourg: I don't have a lysander, but did come up with a steering tailwheel solution for my 8 foot Turbo beaver that works fine. I'll attach some pics. The concept might work for you plane.
The rudder is pull/pull with two arms, one high one low, the lower unit is attached to wheel rod with two cables on another arm.
If theres enough room, all could be inside the plane. I think this would work with or without tail suspension. Works fine on my plane! FWIW flytwice
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