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1963 Shelby Cooper Monaco King Cobra


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#1 dc-65x

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Posted 17 October 2020 - 03:15 PM

Check out this video of Dave McDonald drifting his King Cobra to a win at the 1963 Riverside Times Grand Prix:

 

 

Here's a video of the race itself:

 

 

I've been saving a vintage Pactra version of the car:

 

King Cobra Body (5).JPG

 

King Cobra Body (1).JPG

 

But first a "MISSION STATEMENT" for this project if I may:

 

I am not going to attempt to build an exact scale miniature motorized model.

Rather, I want to build my version of a 1965 commercial track slot racer or “shop car”.

The real car will serve as an inspiration rather than an exact blueprint for my build.

 

I'm starting this build with a motor.......actually a combination of 2 motors. A Pittman 706 for its precisely made field and end plates and A RAM 426 for its hot armature:

 

PittRam Motor (2).JPG

 

The Pittman 706 motor was not harmed. EJ's Hobbies had the piecies I needed:

 

PittRam Motor (3).JPG

 

The RAM wasn't so lucky   :shok:   :crazy:

 

PittRam Motor (5).JPG

 

Time to start putting the pieces together.........


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#2 Horsepower

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Posted 17 October 2020 - 07:10 PM

What a teaser. This is gonna be good!


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#3 Isaac S.

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Posted 17 October 2020 - 08:17 PM

I have been waiting to see a 706 car. I have really wanted to see the brass on that 706 gleam. Pittman's are my favorite to modify because of showing arms and cast metals that can be polished (brass, aluminum). Great preview!


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#4 Isaac S.

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Posted 17 October 2020 - 08:23 PM

I forgot to mention that I LOVE Shelby's.  :heart:  :heart:  :heart:  :heart:  :heart:


Isaac Santonastaso

#5 dc-65x

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Posted 17 October 2020 - 08:46 PM

I love Pittman's and Shelby's too and this Pittman definitely needs some polishing up.   :D

 

I wanted to go with the Pittman setup for my RAM arm because of its more precisely made components versus the RAM's stamped parts. The ram uses simple stamped upper and lower pole pieces that don't really conform to the armature. Check out the how the Pittman fits the arm:

 

Pittman 703-706 Top Speed Challenge- 003.JPG

 

But just screwing those new packaged Pittman parts together...........

 

PittRam Motor (1).JPG

 

.......lead to a misaligned mess:

 

PittRam Motor.JPG

 

Turns out there are burrs from the drilled holes and casting flash that are causing the problem. I'm getting to work on that and I'll be upgrading the motor with these goodies. Weldun 64P gears, SKF armature ball bearings, Boca axle ball bearings and a drill blank axle:

 

PittRam Motor (6).JPG

 

And instead of the Pittman brushes I'm going to go with the RAM brushes and try the RAM 850 brush spring assortment with 3 different tensions:

 

PittRam Motor (4).JPG

 

Time to start deburring and polishing those Pittman parts....

 

 

 


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#6 don.siegel

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Posted 18 October 2020 - 03:43 AM

Another great project Rick, thanks for letting us watch. 

 

Have you also worked on the Ram DC222 and how would it compare? I'm wondering because I just saw one run in a vintage race and it seemed to be faster than the usual motor of this type. That's a 7-pole arm and the arms are available separately, which I don't think is the case for the 426. 

 

Don 



#7 dc-65x

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Posted 18 October 2020 - 12:08 PM

I haven't used a RAM DC222 yet Don but I've got a project in mind for one. That armature appears to be a 3/32" shaft version of the DC850.

 

Speaking of armatures, here's the one in the DC426:

 

PittRam Motor (8).JPG

 

The stack was a bit to large in diameter for the Pittman setup and needed to be turned down. The laminations were pretty sloppy anyway. A little epoxy on the windings and a carbide lathe bit worked great:

 

PittRam Motor (12).JPG

 

The comm was way out of round too:

 

PittRam Motor (13).JPG

 

The arm wouldn't stop in the same place when I rolled it on the razor blades for balancing so I left well enough alone:

 

PittRam Motor (7).JPG

 

 

 


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#8 Pablo

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Posted 18 October 2020 - 12:26 PM

:heart:  :heart:  :heart:  :heart:


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#9 Isaac S.

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Posted 18 October 2020 - 01:22 PM

Looks fantastic! I really need to buy a hobby lathe, I would use it every day. 


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#10 Bill from NH

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Posted 18 October 2020 - 06:38 PM

One of the best investments I ever made in the hobby. I bought a Unimat in 1970. They're no longer made, today I'd take a hard look at the Sherline & the Taig.


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#11 dc-65x

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Posted Yesterday, 10:56 AM

A hobby lathe is a valuable tool and can be lots of fun. So can a small milling machine. I used mine to drill lightening holes into the Weldun gear. I will probably increase my rear wheel speed by at least 2 or 3 rpm.  :crazy:   Well, it does look cool:

 

Pittman 703-706 Top Speed Challenge- 018.JPG

 

 Here are the end plates all deburred and polished out. I also added two tapped holes to mount the motor to a chassis:

 

PittRam Motor (9).JPG

 

And here with the dual ball bearings installed compared to the stock piece:

 

PittRam Motor (10).JPG

 

Putting all the pieces together my hobby lathe was put to use again. The Weldun gear needed a little trimming to clear the armature.......


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Rick Thigpen
Check out Steve Okeefe's great web site at its new home here at Slotblog:
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There's much more to come...






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