[f-AA] Scott 3200 question

[Ryan Lunde]

To open up Pandora’s box, I’ve got a tailwheel question. 

I had some serious troubles with my worn out Scott 3200. I ordered a rebuild kit and a new steering arm and it went back together beautifully. Virtually everything inside is new. I haven’t taxied it yet due to a carburetor overhaul, but I’ve pushed it around on the ground. The only trouble I notice so far is that when it breaks into caster, it seems to require less pressure than it should. It breaks over just a little too easily, it seems, compared with what I’m accustomed to. Does anyone know if tightening the nut which holds the fork to the head might help get it to have a little more resistance before breaking loose?

-Ryan

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[Ryan Lunde]

Also, I my tailwheel had the short pawl and I replaced it with the long pawl included with the rebuild kit and that may have something to do with it as the long pawl breaks over sooner than the short pawl.

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From: aer...@westmont.edu <aer...@westmont.edu> on behalf of Ryan Lunde <N85...@hotmail.com>
Sent: Friday, April 12, 2019 11:22:43 AM
To: aer...@westmont.edu
Subject: [f-AA] Scott 3200 question

 

[Gib Valbert]

[Gib Valbert]

   The break away is less easy with press. on rudder pedles

['Jim' via aeronca]

Ryan,

Yes tightening the nut will increase the resistance.

Jim

[Richard Holcombe]

When you push it past the end of the travel of the steering arm, it breaks free automatically.

[Ryan Lunde]

Thanks, Jim, I’ll give it a try.

Richard, yes, but there’s resistance at the end of steering arm travel. Mine just has particularly low resistance at the moment compared to most other tailwheels.

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From: aer...@westmont.edu <aer...@westmont.edu> on behalf of Richard Holcombe <rhawley...@gmail.com>
Sent: Friday, April 12, 2019 12:57:21 PM
To: aer...@westmont.edu
Subject: Re: [f-AA] Scott 3200 question

 

[Paul Safran]

The nut only changes rhe friction on the "clutch/dampner" plates

pressed together with 5 little springs.

 

the spring clip in the cast housing determines the break to castoring.

It can be bent to need more pressure.

also dress any burr or wear out of the slot

 

Paul

 

 

 

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From: "Jim' via aeronca" <aer...@westmont.edu>
Sent: 12 April 2019 15:19
To: aer...@westmont.edu
Subject: Re: [f-AA] Re: Scott 3200 question

[Paul Safran]

The nut only changes rhe friction on the "clutch/dampner" plates

pressed together with 5 little springs.

 

the spring clip in the cast housing determines the break to castoring.

It can be bent to need more pressure.

also dress any burr or wear out of the slot

 

Paul

 

 

 

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From: "Jim' via aeronca" <aer...@westmont.edu>
Sent: 12 April 2019 15:19
To: aer...@westmont.edu
Subject: Re: [f-AA] Re: Scott 3200 question

 

[donharvie]

Ryan,

I had a similar problem with the secondhand Scott 3200 I put on the Auster.

The problem was the 3214 steering arm detents were worn and had rounded edges where the ends of the spring clip seat when the tailwheel is in the locked position.

I ordered a new 3214 arm and then found the old spring clip was just a fraction longer and wouldn't full seat into the detents on the new arm. To fix that I filed the ends of the spring clip just enough that it was fully seated in the detents.

Both of these issues made the t/w unlock too easily for my liking.

HTH,

Don H

Auster J4 VH-CRR

Sent from my 'phone

[Ryan Lunde]

I spoke with Airframes Alaska and they suggested I bend the spring outward a little. I did and I was baffled to find it seemed to make my problem worse. Then I remembered a guy saying that light tailed airplanes should only have three  compression springs in the assembly rather than five. I don’t know how that would have an impact, but I removed two and now it seems to be behaving properly. 

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From: aer...@westmont.edu <aer...@westmont.edu> on behalf of donharvie <donh...@gmail.com>
Sent: Friday, April 12, 2019 2:15:28 PM

[Harvey Brock]

    I fail to understand the logic of why removing 2 springs would help increase the force required to break it out.

Harvey, who no longer flies with a Scott 3200.

Sent from my Samsung Galaxy Tab®4

[Ryan Lunde]

I don’t understand it either. Likely it had more to do with the way it went back together this time, but I’m not in any hurry to put the springs back in.

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From: aer...@westmont.edu <aer...@westmont.edu> on behalf of Harvey Brock <harve...@hotmail.com>
Sent: Saturday, April 13, 2019 2:44:22 PM
To: aer...@westmont.edu
Subject: RE: [f-AA] Re: Scott 3200 question

 

[Harvey Brock]

Gib mentioned putting pressure on both pedals. I can understand why that makes a difference and need to experiment with his suggestion. I've had the tailwheel break out while taxiing in a stiff cross wind. That would have been a good time to try Gib's idea.

Harvey, watching the grass look shorter as the water rises more and more.

[T I]

I gave up on Maule and Scott.  I put an API tailwheel and I’m very pleased with it!  Vastly improved the handling of my 7BCM!

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From: aer...@westmont.edu <aer...@westmont.edu> on behalf of Harvey Brock <harve...@hotmail.com>

Sent: Saturday, April 13, 2019 9:44:22 PM
To: aer...@westmont.edu
Subject: RE: [f-AA] Re: Scott 3200 question

 

[Don Harvie]

That is very interesting. I have three springs on mine, and my T/W came from a Stinson 108. I would have thought  it should have five.

FWIW I took some photos of the worn detents on my old steering arm today:

https://photos.app.goo.gl/K2qVyjzvxhKZnpha8

Don H

Auster J4 VH-CRR

Sent from my iPad

[Tom Boyle]

Changing the total spring rate (total number of springs) will change the trail angle of the tail wheel assembly.  That will change everything about the feel of the tailwheel response when it's loaded.  If you fly alot with the pane loaded to max with cargo or pax, you may have to add back a leaf.  Our little planes have an outsized response to various loading conditions.

Tom

Virus-free. www.avg.com

[Paul Safran]

Some clarification needed in this thread....

 

There are 4 types of springs in this tailwheel assembly;

1) leaf spring

.... usually 3 pieces, attaches assembly to airframe

.... critical to geometry of pivot point of assembly

.... some installs may have beefier or more leafs

2) steering springs (x2)

.... can be tension or compression style

.... attach rudder horn to tailwheel to steer

3) internal clutch springs ( 3 or 5 installed )

.... apply pressure to clutch plates internally

.... adjusts resistance to swivel within steering arc

.... steering arc determined by pawl (long or short)

.... critical as a shimmy dampener

4) spring clip

.... internal to allow full swivel 

.... tension & detent wear vary "kick-out" force

 

in practicality the pawl size & clutch tension will

vary how the kick-out tension feels too.

 

It's a bit of an art to get these right, and how our

tandem aircraft are loaded changes it all.

 

And, to throw more fuel on the fire, I think the zerk

should be removed. Too many times I see it pumped

full of grease until oozing out.

Well, you just greased your clutch plates!!!!!!!!!!!!!!!!

Yeah, that helps?

 

Paul

(with a 3200 that needs some luv'n )

 

 

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From: "Tom Boyle" <tomb...@charter.net>
Sent: Sunday, April 14, 2019 10:03 AM

[Ryan Lunde]

I'm happy to report that after the rebuild, my Champ is steering on the ground properly and the breakout force is just how I like it.  Thanks, All.

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From: aer...@westmont.edu <aer...@westmont.edu> on behalf of Paul Safran <psa...@graffitis.com>
Sent: Sunday, April 14, 2019 3:16 PM

[j...@joea.com]

Great to hear Ryan!

Now tell us about your flight to Utah in the Champ last week! :)

Joe A

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From:                         Ryan Lunde <n85...@hotmail.com>

To:                            "aer...@westmont.edu" <aer...@westmont.edu>

Subject:                     Re: [f-AA] Re: Scott 3200 question

Date sent:                  Wed, 24 Apr 2019 16:16:01 +0000

Send reply to:             aer...@westmont.edu

I'm happy to report that after the rebuild, my Champ is steering on the ground properly and the breakout force is just how I like it. Thanks, All.

  

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