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Cox Engine of The Month
May-2024
1/2A Nut's

"Cox Tee Dee .051 RC Marine"



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Post  roddie Mon Nov 04, 2013 6:15 pm

Which engine is this?

Cox outboard boat motor Cox_ou10
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Post  SuperDave Mon Nov 04, 2013 6:18 pm

From the looks of it's a TD .049 or .051

SD


Last edited by SuperDave on Tue Nov 05, 2013 10:43 am; edited 1 time in total
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Post  bullit132 Mon Nov 04, 2013 7:47 pm

i say its 049?? and very cool,custem made im sure:cox logo: 
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Post  SuperDave Tue Nov 05, 2013 8:51 am

It could be either because both are externally identical. The way to identify a .051 is to look for the circular ring around the piston. No ring? It's a .049.

SD
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Post  Cribbs74 Tue Nov 05, 2013 9:37 am

Usually when the carb body is red it is assumed an .051 when it's black .049. However, Dave you are correct in that parts are easily swapped between the two therfore, the ring around the piston will rule out any doubt.

Performance is the same so in the end it doesn't really matter.
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Post  crankbndr Tue Nov 05, 2013 9:42 am

Here is another made by Dennis Fadden using a TD .010
Many amazing small engines are shown here, some with Cox parts, use the links to fully explore this web site.

http://www.craftsmanshipmuseum.com/KnappCol.htm

http://www.craftsmanshipmuseum.com/rooms.htm

Cox outboard boat motor Knapp110


Last edited by crankbndr on Tue Nov 05, 2013 12:02 pm; edited 1 time in total
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Post  SuperDave Tue Nov 05, 2013 10:12 am

Cribbs74 wrote:Usually when the carb body is red it is assumed an .051 when it's black .049. However, Dave you are correct in that parts are easily swapped between the two therfore, the ring around the piston will rule out any doubt.

Performance is the same so in the end it doesn't really matter.
As a footnote to Ron's comment:

The distiction between the otherwise identical TD .049 and .051's was made for AMA class purposes:  the .049 is a 1/2A while the .051 is Clas A.  So a single plane could be flown in either class depending on the engine used.

(Why do I know these things?) Laughing 

SD
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Post  SuperDave Tue Nov 05, 2013 1:21 pm

My concern with the outboard shown would be the venturi facing prop wash. Huh...  A good way to suck in water especially on launching. Huh... 

SD
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Post  anm2 Tue Nov 05, 2013 4:09 pm

SuperDave wrote:My concern with the outboard shown would be the venturi facing prop wash.  Huh...  A good way to suck in water especially on launching.  Huh... 

SD
My thoughts as well. Not sure how you would solve that, but the .010 engine is as cool as it gets. Andy
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Post  Jason_WI Tue Nov 05, 2013 5:58 pm

Cox made a prototype outboard motor that looked like a Mercury Marine outboard including the engine cover. A picture of it is in the Cox Model Engine Handbook.
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Post  roddie Tue Nov 05, 2013 6:31 pm

anm2 wrote:
SuperDave wrote:My concern with the outboard shown would be the venturi facing prop wash.  Huh...  A good way to suck in water especially on launching.  Huh... 

SD
My thoughts as well.  Not sure how you would solve that, but the .010 engine is as cool as it gets.  Andy
If the venturi was fitted with a forward-facing "snorkel" and bracket, it would solve that problem. It could be made of aluminum tubing and fastened to the venturi with a short silicone tubing "sleeve" and sm. tie-wraps. At speed; it might even produce a "ram-air" effect!
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Post  Jason_WI Tue Nov 05, 2013 6:42 pm

Cox outboard boat motor Ae8f60adf97c9e0965c890782ee2cf88_zps2a24eb45

Cox outboard boat motor 3d1004a02a816e9f8d00ebfe8cc6cbf3_zps54d46664

Cox outboard boat motor Ba85d29ca8c2d7da32fd914713e225bc_zps837b58b7
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Post  crankbndr Tue Nov 05, 2013 7:06 pm

That Cox outboard is really cool, never seen one. Thanks for the photo, now I know what I want for Christmas.
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Post  RknRusty Tue Nov 05, 2013 7:21 pm

crankbndr wrote:That Cox outboard is really cool, never seen one. Thanks for the photo, now I know what I want for Christmas.
Then they'd never get you out of the bath tub.lol! 

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Post  crankbndr Tue Nov 05, 2013 8:12 pm

RknRusty wrote:
crankbndr wrote:That Cox outboard is really cool, never seen one. Thanks for the photo, now I know what I want for Christmas.
Then they'd never get you out of the bath tub.lol! 
My wife could bring me batteries and fuel.
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Post  Jason_WI Tue Nov 05, 2013 9:12 pm

Good luck getting the cox outboard for x-mas. It's in Dan Sitters collection.
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Post  roddie Tue Nov 05, 2013 9:52 pm

crankbndr wrote:
RknRusty wrote:
crankbndr wrote:That Cox outboard is really cool, never seen one. Thanks for the photo, now I know what I want for Christmas.
Then they'd never get you out of the bath tub.lol! 
My wife could bring me batteries and fuel.

don't forget coffee... Thumbs Up 
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Post  roddie Wed Nov 06, 2013 9:58 am

Here's a couple from my photo archives... The "Atwood" positions the venturi "forward"... while the "Wen-Mac's" faces rearward. The "drive-units" look to be nearly identical.

The Atwood "Speedster"
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The Wen-Mac
Cox outboard boat motor Wen-ma10
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Post  crankbndr Thu Nov 14, 2013 3:38 pm

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Post  crankbndr Thu Nov 14, 2013 3:43 pm

roddie wrote:Here's a couple from my photo archives... The "Atwood" positions the venturi "forward"... while the "Wen-Mac's" faces rearward. The "drive-units" look to be nearly identical.

The Atwood "Speedster"
Cox outboard boat motor Atwood10

The Wen-Mac
Cox outboard boat motor Wen-ma10

They are nice looking outboards, been thinking about starting an outboard collection myself. Very cool.
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Post  Mark Boesen Thu Nov 14, 2013 4:58 pm

...when I was a little kid (couple months ago) I had a really neat scale plastic speed boat with a looking electric motor, metal outboard. I've always thought it would be neat to find one like that again, but I probably wouldn't want to pay for it.
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