CMP Ford F-AT Quad...help?

[DaveW]

Can anyone help me with some photos of the Drive Transfer Case on the Gun Tractor?
It would be nice if it was the Tractor version, with the take-off shaft for the winch.
But even just the regular four-by-four transfer would help.
I'd love to see one out of the chassis, from multiple angles.
I am basically interested in the overall shape and design and how it's bracketed to the frame.

...
Sorry, for the lack of updates...
Work is continuing quite nicely on my 1/16 paper model.

Yes, I am aware that at the start of this thread, I said I was working on a 1/18 model.
I started out with the idea of doing a 1/24 scale kit, but found that some parts were too small.
Even though I stylize and simplify a lot of things, this kit was to be on par with my previous large scale builds.
And those are all 1/16 scale.

So, I gave up on the idea and went back to 1/16 scale!
The Gun Tractor isn't a large vehicle anyway, so the model will be under a foot long.

shhhh...I know...once the Limber and Gun trailer are added, the model will be 3 feet long! shhh.

Anyway...after a quick test of the basic body design, I switched over to the Frame and Chassis.
Its best to get all that sorted first and then figure out how to fit the Body.

Heres a few photos of construction so far.
(Axles are not yet installed...just placed (upside down! lol) for the photos)
Everything you see is 100% paper (cardstock)
Some things are stylized to make them more easily buildable (in paper).
Frame rails, for example, are straight in-line and boxed.

Keep in mind, I am designing on the fly and sometimes things get thrown out as the design changes,
but usually, I just keep modifying what I have already built.
So what you see may not be the final design.
At the same time, I am designing Parts for a retail kit, keeping track of the assembly,
creating Instruction pages with assembly diagrams, and more!

So, its a lot of slow work.
It can take months...often well more than a year to finish everything (before a retail kit is available).

Anyway, feel free to ask any questions.

[DaveW]

Just for fun, another photo update...

I test fitted the Axles again, along with the newly added Power Take Off.
In this case, its an adapted Axle/Differential used to drive the power winch/tow cable.

I need only to complete the Drive Transfer unit and then I can sort out all the driveshafts.

Engine and Transmission are still on hold until I decide what to do about Body, floor pan, and interior components.

[DaveW]

Can anyone explain some of this to me?
or give me more photos.

There appears to be a flat plate between the frame rails at the very rear?
Does it span rail to rail?
is it mounted below the rails (to the bottom of the frame rails?
Just how much area does it cover and what is it for?

Also...there are two cable reels...
what are these for?
And are they mounted below that plate I mentioned above?
is that the purpose of the flat plate? (a mounting surface?)

I'm guessing the two reels, create a guide for the tow cable...but I am guessing.
I assume these reels are not driven.
But are they brakes of some sort?

What about the diameter of these reels?

These are the only photos I have, and things aren't clear to me.

[DaveW]

Bruce...you mean the Wheels?!
The center hubs of the wheels are wrong?

You are telling me that the front is on the back, and the back is on the front!?!

lol
yes, the wheels are not attached.
I just pushed them onto the axles so I could take a photo.
I wasn't paying any attention to their position.
Even the Axles/Diffs are not glued in place yet...the springs are just resting on them
(again, for the purpose of a photo).

Thanks...good eye...!

[Richard Coutts-Smith]

Dave, assuming that the winch fairleads are same across the range of CMP's:
The two wire rope sheaves or pulleys are un-braked and measure in at 8 3/4inch diameter, 1 1/2inch thick, mounted on a vertical pin that passes through a boss top and bottom of both sheaves. This gives an overall height of 3 3/4 inches between the two mounting plates. The top mounting plate is as you have marked, going full width under the chassis rail. There is a lower plate that retains the mounting pins, it is the width of the two sheaves combined, and is basically a wide "U" section welded to the underside of the top plate.
The bottom roller I have goes full side to side, but guessing the diameter would be the same, 3 1/2 inch.
You know there is a set of fairleads on the front bumper as well?
Rich.

[DaveW]

Originally Posted by Richard Coutts-Smith

Dave, assuming that the winch fairleads are same across the range of CMP's:
The two wire rope sheaves or pulleys are un-braked and measure in at 8 3/4inch diameter, 1 1/2inch thick, mounted on a vertical pin that passes through a boss top and bottom of both sheaves. This gives an overall height of 3 3/4 inches between the two mounting plates. The top mounting plate is as you have marked, going full width under the chassis rail. There is a lower plate that retains the mounting pins, it is the width of the two sheaves combined, and is basically a wide "U" section welded to the underside of the top plate.
The bottom roller I have goes full side to side, but guessing the diameter would be the same, 3 1/2 inch.
You know there is a set of fairleads on the front bumper as well?
Rich.

My "pulleys" are 12" x 2" scale size...so not too far off.
Not bad for a guess.
Sometimes, a bit bigger is better for scale assembly.

I am still unclear about the second mounting plate.
The "wide U section" you refer to.
I can see part of it in my reference photos, but its still not clear to me
how it mounts, or its actual shape and size.
Its not a big concern, since I am not including every accurate detail, but...



...
"fairleads"...whats that?
You wouldn't be talking about that roller cable guide thingy?
Is that what you refer to "up front"?



...
Where is the cable guide in the rear?
Does it go here(photo)?
Something is missing (on my model) to guide the tow cable under the frame.

[Richard Coutts-Smith]

Better described as a Wide "L" shaped plate...this also holds the guide roller behind the sheaves.
Fairleads = Roller Cable Thingy, or any roller guiding the winch cable.
The fairleads on the front, as shown in your pic, are nice and simple, they can be heavier and more complex than that: swing out rollers to pass the cable hook/eye through.
Just in case.... the wire rope is fed around the outer sheave and forward to the fairlead on the front bumper for when winching is required at the front of the truck.
Rich.