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Mystery armature


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#1 dc-65x

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Posted 18 June 2006 - 07:31 PM

I got a small lot of *rap off of Epay last week and this arm was in it. It was almost completely covered in armature dye, windings included. This is what it looks like with the dye and dust bunnies cleaned off:

Posted Image

Notice the phenolic inserts over the windings. I have a Thorp add in a Model Racing Journal from November 1, 1968 that mentions phenolic inserts. I ASSume the markings stand for a single 26 wind with counter clockwise timing:

Posted Image

Notice that a green coating was used on the laminatiions instead of fiber plates used on older rewinds. The laminations are also thin, probably .007" thick.

:Posted Image

The thing reads .2 ohm on every pole so it should run but I'm not sure what motor to put it in. A Mura A-can with white end bell from early 1969 or so??????????

Any of my fellow Blogger's seen something like this before :?

Thanks in advance,

Rick
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#2 Larry LS

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Posted 18 June 2006 - 08:01 PM

Yep looks just like a couple Thorpe 26 single CC motors I had. Iincluding one I gave to the Dokk at a convention in Vegas a couple years ago. I had used it in a great B can motored car I had then. About the only motors I ever saw that had the phenolic pieces between the poles.

They were great arms. Some guys said they ran too hot because of the air flow not getting to the windings. I never found that with mine. :)
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#3 rdmac

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Posted 18 June 2006 - 08:06 PM

Interesting piece Rick. I've never seen anything like that.
By my count, there are approx. 96 laminations. If they were .005 thick the stack length would be .480 long.
Did anyone ever use .005 laminations?

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#4 obnoxious001

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Posted 18 June 2006 - 08:23 PM

Pretty sure it is a Thorp. I could print a photo and show Gil Gunderson for verification. A guy showed me a 24CC just like that yesterday at the raceway,, Foamy said it was a Thorp with the phenolic like that. Same guy had a Steube gp20,, he almost came unglued when I told him Mike had been at the track just a few hours earlier.
Barry Obler

#5 dc-65x

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Posted 18 June 2006 - 08:35 PM

Thanks for the replies. Larry used his in a B-motor :up: . I wonder if the arm was made to late to have been used in an A-can? Barry if you could check with Gil and see what year he thinks it was made I'd appreciate it :)

Rick

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#6 obnoxious001

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Posted 18 June 2006 - 09:16 PM

No problem Rick. Foamy and Philippe may have a pretty good idea also. The one I saw yesterday was in a Mura Greene can, but the holes had been opened up gp 20 style.
Barry Obler

#7 Vitter415

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Posted 18 June 2006 - 10:01 PM

Rick :wave:

How are you ? Fine I hope ;) not to a bad guy here , but there dosn't look like there is much or if any life left in that com :cry: if you need one p/m me and we can work out the :mrgreen: stuff :dance: and to the blogers it is indeed a Thorp arm :up:

as always Rick, regards Dave 8)

#8 TSR

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Posted 18 June 2006 - 10:11 PM

It's a 1969 Thorp.

Philippe de Lespinay


#9 dc-65x

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Posted 19 June 2006 - 12:41 AM

Thanks everyone.

It's a 1969 Thorp.

Roger that :)
I know she's an old dog with a thin com but I think she desirves to run a few more laps in a period car. I don't plan on entering an enduro but I'd like to, as my friend Rodney woud say, "see it move again". Now I can make her period Korrect :mrgreen: . Thanks again.

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#10 Slotgeezer

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Posted 19 June 2006 - 03:49 AM

As I remember my slot racing history, the "green goop" arm blanks were a Mura product... :| ... & yes, I remember the phenolic inserts as being of Thorp origin... the .007" thick lamination material was the basis for the ".007' armature blank" sales literature of that day... thank you for the wonderful photo, brought back fond memories I have of the many 29-29 Thorp armatures I ran as a youngster.... a Classic 16D ball-bearing can, a set of Mura 88X magnets w/ floded shim, or Arco 33's w/ the one-piece shim, an "unmeltable" Mura endbell w/ modified hardware, Mura post protectors, & Tradeship brushes & springs & you'd be stylin'!!! :lol: ... Enjoy!

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#11 Champion 507

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Posted 17 June 2014 - 01:44 AM

Rick,

 

Mr. Peabody and I just stepped out of the Wayback machine and were wondering if you ever did anything with this arm.

 

Inquiring minds want to know...................

 

Also looked at the date, almost 8 years ago to the day.


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#12 SlotStox#53

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Posted 17 June 2014 - 07:18 AM

Good job dusting off this thread Doug :good: That looks one sweet & powerful Thorpe arm :D

Be great to see it in a motor again tearing up the track.

#13 Steve Deiters

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Posted 17 June 2014 - 07:48 AM

For a brief moment in time back in that era the Thorp 26/27 double was the hottest thing going.........



#14 Champion 507

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Posted 17 June 2014 - 08:41 AM

I still have a 25S arm I got brand new in Indianapolis in 1970 and a 27/28 arm I got from a friend of mine 15 years ago. Also still have a NOS Thorp armature mailing envelope.

 

Three Thorp items, that's all I have.


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#15 dc-65x

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Posted 17 June 2014 - 09:14 PM

Rick,

 

Mr. Peabody and I just stepped out of the Wayback machine and were wondering if you ever did anything with this arm.

 

Inquiring minds want to know...................

 

Also looked at the date, almost 8 years ago to the day.

 

Hi Doug,

 

I believe that particular arm was part of a large lot of stuff that I sold to help pay for my home track.

 

I still have 1 loose Thorp arm and 2 in motors. One is a Mura 2-hole A-can with the dark gray "unmeltable" endbell. The other is in a Champion Orange Picker 16D setup.


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#16 Bill from NH

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Posted 17 June 2014 - 10:09 PM

Someone has been selling a variety of NOS Thorp arms, still in the package, on ebay the last couple months. They start at $33, but I haven't noticed any of them selling.

 

In the day, Thorp did my balancing but I never bought any of his arms. I had the chance to run a friend's 23S Thorp on the original Modelville Purple  Mile. That thing had gobs of brut power. :)  


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#17 SlotStox#53

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Posted 17 June 2014 - 10:46 PM

Noticed those Thorp arms too Bill :good: As you say they haven't sold & have been listed for a good few months, maybe more. A 23S ? holy smokes , can imagine the grunt/horsepower outtat that thing!!! :D



#18 Bill from NH

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Posted 18 June 2014 - 08:41 PM

Paul, that Thorp 23S belonged to Ken Stevens, who now lives in Houston. Ken had quite a collection of Thorp arms. For a few years in the early 70's, I raced with Ken & his dad Al in the Boston metro area.


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#19 tonyp

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Posted 20 June 2014 - 10:31 AM

Thorpe made some really good stuff and his balancing service was excellent.
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#20 tonyp

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Posted 20 June 2014 - 10:31 AM

Also made the best Allen wrenches I ever used.

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