Looking a bit more help
Any pictures or measurements for were the servo boxes go for the flaps, airbrakes and Servos
Thanks
Andrew
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Teakle ASW 20 3.5/1
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Peter Balcombe
- Posts: 968
- Joined: 18 Mar 2015, 10:13
- Location: Clevedon, North Somerset, U.K.
Re: Teakle ASW 20 3.5/1
Andrew,
I don't think that there any definitive locations for the airbrake & flap servos (although the original PT kit building sketches probably show the approximate airbrake location and assume the flaps to be operated via a fuselage torque tube & single fuselage mounted standard size servo arrangement)
I mounted my airbrake servos (micro servo size) on 1/16" ply plates epoxied into balsa lined rectangular cutouts made in the underside of each wing so that the servos were completely hidden beneath the lower wing surface. There may be a length of Bowden cable tube pre-installed into wings, with end points marked on the lower wing surface, but I can't remember now. If so, then install brakes at outboard end (with sufficient space to get full brake attachment movement without fouling the tube) & mount the servo box sufficiently far inboard of inner end of tube to allow room for servo attachment and full movement. Position the servo box cutouts so that the airbrake actuation cable quick link will be in line with the servo arm for a straight push/pull action. The servo box can be fitted with a removeable flush fitting lid. Either secure the lid using small countersunk head screws (see Model Fixings website for a range of these), or use tape.
For the flaps, I bottom hinged my flaps and used Hitec HS-225MG mini sized servos located approx 1/3 of the way along the flap (as near to centre as I could get it whilst still having sufficient wing thickness to accept the servo body within a lined servo box cutout). The servo itself was securely mounted on a lower wing surface flush ply plate, which itself was firmly screwed to the servobox frame. The servo arm poked through a slot in the ply plate which permitted full servo throw movement. The 1/16" thick epoxy sheet flap horn was epoxied into the lower surface of the flap to give nearly 90 degrees down flap & zero up flap.
Note that you can mount the servo towards the rear of the wing to minimise linkage length, but remember to leave enough for mechanical adjusters to enable the servo travels/servo horn angles to be setup the same on both wings - otherwise the flap movements will be different.
Note that as the flaps are more likely to touch the ground/grass during a landing if flaps not retracted immediately before this point, significant shock loads can be transmitted back to the servo gears/servo attachments - in addition to flap drag loads - so the servos/installation needs to be able to withstand this without being torn from the wing!
I am away from home at present, but will try to remember to take some photos of my ASW20 installation when I get home in a couple of days.
Hope this helps,
Peter
I don't think that there any definitive locations for the airbrake & flap servos (although the original PT kit building sketches probably show the approximate airbrake location and assume the flaps to be operated via a fuselage torque tube & single fuselage mounted standard size servo arrangement)
I mounted my airbrake servos (micro servo size) on 1/16" ply plates epoxied into balsa lined rectangular cutouts made in the underside of each wing so that the servos were completely hidden beneath the lower wing surface. There may be a length of Bowden cable tube pre-installed into wings, with end points marked on the lower wing surface, but I can't remember now. If so, then install brakes at outboard end (with sufficient space to get full brake attachment movement without fouling the tube) & mount the servo box sufficiently far inboard of inner end of tube to allow room for servo attachment and full movement. Position the servo box cutouts so that the airbrake actuation cable quick link will be in line with the servo arm for a straight push/pull action. The servo box can be fitted with a removeable flush fitting lid. Either secure the lid using small countersunk head screws (see Model Fixings website for a range of these), or use tape.
For the flaps, I bottom hinged my flaps and used Hitec HS-225MG mini sized servos located approx 1/3 of the way along the flap (as near to centre as I could get it whilst still having sufficient wing thickness to accept the servo body within a lined servo box cutout). The servo itself was securely mounted on a lower wing surface flush ply plate, which itself was firmly screwed to the servobox frame. The servo arm poked through a slot in the ply plate which permitted full servo throw movement. The 1/16" thick epoxy sheet flap horn was epoxied into the lower surface of the flap to give nearly 90 degrees down flap & zero up flap.
Note that you can mount the servo towards the rear of the wing to minimise linkage length, but remember to leave enough for mechanical adjusters to enable the servo travels/servo horn angles to be setup the same on both wings - otherwise the flap movements will be different.
Note that as the flaps are more likely to touch the ground/grass during a landing if flaps not retracted immediately before this point, significant shock loads can be transmitted back to the servo gears/servo attachments - in addition to flap drag loads - so the servos/installation needs to be able to withstand this without being torn from the wing!
I am away from home at present, but will try to remember to take some photos of my ASW20 installation when I get home in a couple of days.
Hope this helps,
Peter
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Peter Balcombe
- Posts: 968
- Joined: 18 Mar 2015, 10:13
- Location: Clevedon, North Somerset, U.K.
Re: Teakle ASW 20 3.5/1
Andrew,
Having just got home & looked at the original build instructions and one of the wings, I can see that my previous post was not quite right.
The original wings were supplied on the assumption that both flap & brake servos would be fuselage mounted.
Thus there was a brake Bowden cable tube pre-fitted to exit the wing root forward of the main spar.
I didn't mount the flap servo on it's cover after all. I note that the brake cable connection needs a bit of TLC
The attached photos should explain what I did & this works ok for me.
Having just got home & looked at the original build instructions and one of the wings, I can see that my previous post was not quite right.
The original wings were supplied on the assumption that both flap & brake servos would be fuselage mounted.
Thus there was a brake Bowden cable tube pre-fitted to exit the wing root forward of the main spar.
I didn't mount the flap servo on it's cover after all. I note that the brake cable connection needs a bit of TLC
The attached photos should explain what I did & this works ok for me.
- Attachments
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- Flap & Brake servo locations
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- Brake servo closeup
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- Flap servo closeup
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- Flap servo
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Andrew Wallace
- Posts: 17
- Joined: 20 Mar 2015, 08:33
Re: Teakle ASW 20 3.5/1
That's first class Peter
Thanks
Andrew
Thanks
Andrew
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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
Well after grilling Jeff & Chris at WS on Saturday I've ordered a Turnigy G60 motor & a YEP 80 esc
Surgery was performed on the nose of the 20 & soon it will be sporting an Aeronaut 16x10 folding prop.
It solves for me the question of where & how many Receiver packs I needed to get the CG where it should be with the bulk of that weight now being the motor & esc.
Pictures to follow after work. I've also trimmed my canopy frame down to a 6mm wide base. I just need to trim the fuselage rail around the canopy to suit.
Surgery was performed on the nose of the 20 & soon it will be sporting an Aeronaut 16x10 folding prop.
It solves for me the question of where & how many Receiver packs I needed to get the CG where it should be with the bulk of that weight now being the motor & esc.
Pictures to follow after work. I've also trimmed my canopy frame down to a 6mm wide base. I just need to trim the fuselage rail around the canopy to suit.
Last edited by Martin Church on 28 Jun 2017, 15:15, edited 1 time in total.
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VinceC
- Site Admin
- Posts: 699
- Joined: 22 Feb 2015, 11:45
- Contact:
Re: Teakle ASW 20 3.5/1
Well said Cliff. This is a scale site. Harassy
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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
Oh dear I've upset the purists 
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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
lol I guessed that.Cliff Evans wrote:Your not on your own mate!!!
If I can get this past them I promise to leave the pic 20 as th gliding gods intended.
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chris williams
- Posts: 1018
- Joined: 10 Mar 2015, 10:50
- Location: Blandford Dorset
Re: Teakle ASW 20 3.5/1
Your not on your own mate!!!
That's two of you, then...you should form a club
That's two of you, then...you should form a club