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Supporting Owners, Builders and Pilots of the Thorp T-18 and its variants.
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James Grahn
 Post subject: Re: Elevator Manual Trim
PostPosted: Wed Oct 25, 2017 9:54 pm 
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As I said Todd, it is ok to support it more. I highly recommend you do that. It is flopping because it is not supported. Since it is not supported, the natural bow in the tube will spin around in the tail. It may catch on something. The only way it can flop like that is because it is binding at either end because it is not supported where it should be.
Go for it.
Cubes


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hjubm2
 Post subject: Re: Elevator Manual Trim
PostPosted: Wed Oct 25, 2017 11:04 pm 
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Joined: Wed Jun 01, 2016 1:13 am
Posts: 22
Location: Barossa Valley, South Australia
Rich Brazell wrote:
I used "floating"nut plates on the supports for my baggage compartment and the floor along with the 3 sides are attached to the nut plates using eye bolts . Serves two purposes . Secures the walls and floor and I can use the eye bolts to to secure my trash with bungee cords . BING , BANG , BOOM !

RB O0


Sounds like you've got it all sorted Rich. At the moment mines attached with clip on nut things that are kind of like a paperclip on the top and sides, don't have a clue what they are called but they work well. Only problem is that the rear panel mounts behind the bulkhead and there is a lip on the inside of that same bulkhead so the panel can't be mounted to the front. I might have to look at cutting it in half and riveting an overlapping panel to the center with some floating nuts. Should solve the problem of removal and installation a new support behind the baggage area.

James Grahn wrote:
As I said Todd, it is ok to support it more. I highly recommend you do that. It is flopping because it is not supported. Since it is not supported, the natural bow in the tube will spin around in the tail. It may catch on something. The only way it can flop like that is because it is binding at either end because it is not supported where it should be.
Go for it.
Cubes


Cheers again Cubes for your insight. I went and checked the trim again today and when you turn the trim wheel you can hear the rod flicking around and even impacting part of the fuselage so it's not ideal atm. I can't believe it's been like this for 40 years without a problem or anyone changing/fixing it. It was one of the first things on a very long list of repairs/changes at the new maintenance shop.

Cheers all


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fytrplt
 Post subject: Re: Elevator Manual Trim
PostPosted: Thu Oct 26, 2017 2:38 am 
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Posts: 766
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Location: Lakeland, Florida, USA
As a reminder for those still building, reverse the flange on the bulkhead at the aft of the bagage compartment. Sure makes it easier to attach the panel.

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Bob Highley
N711SH
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Jeff J
 Post subject: Re: Elevator Manual Trim
PostPosted: Thu Oct 26, 2017 6:53 am 
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Joined: Wed Aug 31, 2016 8:18 am
Posts: 276
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Location: eastern OK
The paper clip things you are referring to may be tinnerman nuts, http://m.aircraftspruce.com/catalog/hap ... ckkey=5485 and they last a long time if the proper screw is used. As a matter of fact, they don’t perform to bad even if the wrong screw is used. I have been thinking about camlocks or zeus fasteners myself so I don’t have to chase the screws I will drop.

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"The joke in aviation is, 'If you want to make a million, you'd better start with £10m.' " -Bruce Dickinson


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Binder
 Post subject: Re: Elevator Manual Trim
PostPosted: Thu Oct 26, 2017 7:38 am 
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Joined: Thu Sep 01, 2016 10:50 pm
Posts: 174
I'm late in this thread but my electric trim motor is mounted in the bulkhead just aft of the rear baggage bulkhead. Quite long shaft. When I pull my baggage bulkhead for new vinyl I'll check to see if there are supports on the shaft. I don't recall seeing them when I was doi maintenance. Maybe il find a picture from when I was in there. Mine operates without issues minus being really slow.


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bfinney
 Post subject: Re: Elevator Manual Trim
PostPosted: Thu Oct 26, 2017 10:48 pm 
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Joined: Thu Oct 22, 2009 2:24 pm
Posts: 394
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Location: Auburn, WA USA
Here's a photo of my rear baggage bulkhead, the floor of the baggage compartment is level with the top of the tunnel. The rear bulkhead is mounted to an extra flange that is attached to the back side of the frame. Also note on the left side the support for the trim tube, it is a nylon "adel" clamp, there are similar ones on the right supporting the wiring and static system tubing.

Wish I had a better photo but this will have to do. :)

Attachment:
File comment: Camera position behind pilots seat low looking up toward the rear.
P8081097.JPG
P8081097.JPG [ 469.94 KiB | Viewed 179 times ]

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Bruce Finney
N18JF T-18C #262
Auburn, WA USA


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