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Teakle ASW 20 3.5/1

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Martin Church
Posts: 74
Joined: 06 Oct 2015, 11:23
Location: Somerset edge of Mendips

Re: Teakle ASW 20 3.5/1

Post by Martin Church »

I'm planning on putting micro rudder & elevator servos as near as I can get to the control surfaces. What would be a good mid priced servo for each control how many kg's are needed? I'm thinking over 2kg torque but less than 5kg at 4.8v

Chris Bowles
Posts: 96
Joined: 18 Mar 2015, 16:12
Location: South Devon

Re: Teakle ASW 20 3.5/1

Post by Chris Bowles »

Hi Martin, I have used MKS 135, or if you need a bit more power MKS 125, it's always better to have to much than not enough !!

Chris

Martin Church
Posts: 74
Joined: 06 Oct 2015, 11:23
Location: Somerset edge of Mendips

Re: Teakle ASW 20 3.5/1

Post by Martin Church »

Did you mean KST 125 KST 135 Chris?
I searched mks 125/135 but came up with nothing on HyperFlight
Guessing that around 5.2kg is fine on elevator & go fo the 125 @ 7.0kg for rudder
http://www.hyperflight.co.uk/products.a ... g-7-0kg-cm
http://www.hyperflight.co.uk/products.a ... g-5-2kg-cm

Chris Bowles
Posts: 96
Joined: 18 Mar 2015, 16:12
Location: South Devon

Re: Teakle ASW 20 3.5/1

Post by Chris Bowles »

Martin,
Yes got it wrong again, I meant KST, have been using them for a while now, got 20 plus, no problems yet, thats the kiss of death!!

Martin Church
Posts: 74
Joined: 06 Oct 2015, 11:23
Location: Somerset edge of Mendips

Re: Teakle ASW 20 3.5/1

Post by Martin Church »

Cheers Chris not badly priced either so I'll get one of each ordered up :)

Andrew Wallace
Posts: 17
Joined: 20 Mar 2015, 08:33

Re: Teakle ASW 20 3.5/1

Post by Andrew Wallace »

I'm just about to start building one and there's a few questions I would like to ask
What's the best way to do the elevator, do you go with the long bar in the fin or do you mount a servo in the tail or the fin ?
Where do you fit the servo for the airbrakes?

Thanks
Andrew

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Peter Balcombe
Posts: 1078
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: Teakle ASW 20 3.5/1

Post by Peter Balcombe »

Andrew,
I buried my elevator servo in the tailplane, with a short drive to the elevator.
Much more rigid, and simpler to rig as long as you don't let the fuselage connector drop back down the fin ;)
No problems in flight over several years use.
Attachments
Tailplane linkage
Tailplane linkage

Martin Church
Posts: 74
Joined: 06 Oct 2015, 11:23
Location: Somerset edge of Mendips

Re: Teakle ASW 20 3.5/1

Post by Martin Church »

Peter Balcombe wrote:Andrew,
I buried my elevator servo in the tailplane, with a short drive to the elevator.
Much more rigid, and simpler to rig as long as you don't let the fuselage connector drop back down the fin ;)
No problems in flight over several years use.
Hi Pete I've been slacking after having big issues after carving the ailerons from the living hinge as advised.
It's now impossible to tape hinge & get enough movement for the ailerons dye to warpage after being detached. Not sure what to do next really only thing I can think of is to put plastic pin hinges to control the gap to a size that will allow them to waggle the required amount.

What type of servo did you fit & what pull does it give you at 4.8v
Martin

Andrew Wallace
Posts: 17
Joined: 20 Mar 2015, 08:33

Re: Teakle ASW 20 3.5/1

Post by Andrew Wallace »

Peter when joining the tailplane halves did you strengthen it in any way
Thanks

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Peter Balcombe
Posts: 1078
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: Teakle ASW 20 3.5/1

Post by Peter Balcombe »

Martin,
My aileron servos are analogue TowerPro MG90 metal geared micro units which have been fine.
They have a quoted torque of 2.2Kg/cm at 4.8v, which is how I run mine.

Andrew,
It is a long time since I built my '20' but I am pretty sure I built the tailplane as normal with the 1/4" balsa LE & elevator spar as per the plan .
I think I just dug out the enough foam to sit the JR NES xxx servo in place on the inside of the upper skin, packed it to be firmly sandwiched between the skin veneers and epoxied some small full foam depth balsa blocks around the servo lugs to make sure it didn't move around. I then glassed the completed tailplane and elevator prior to painting. I am pretty sure the servo fitted behind the diamond shaped balsa block, with the horn/Clevis on the centreline so that it sits in a slot at the rear of the fin top ply plate.

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