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

"RC Speed Boat Power Drive TD .020"

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Post  rsv1cox Thu Mar 22, 2018 10:24 am

Turned down cylinder fins, high compression head, #3 grooved cylinder with throttle ring, 2 milar reeds.  Made up?

Two top fins gone, nicely done probably on a lathe.  Too nice to be filed.

As found, ebay $14.50 9 bids.

Curious Cox 350 Babe Bee Curiou10

Curious Cox 350 Babe Bee Cox_3513

Cleaned up.

Curious Cox 350 Babe Bee Cox_3510

I thought the reed felt a little stiff, cleaned it and when I picked it up it separated into two reeds.

Curious Cox 350 Babe Bee Cox_3514

I tried to ID it using the Cox handbook and found two possibles.  

No throttle ring.

Curious Cox 350 Babe Bee Cox_3512

Throttle ring.

Curious Cox 350 Babe Bee Cox_3511

I think it's just a 350-1 that someone had some fun with.  Two reeds, some hop up/hop down mod? or more probably just stuck together when installed.
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Post  ticomareado Thu Mar 22, 2018 5:01 pm

Nicest looking used back plate I've seen in quite a while.
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Post  Cribbs74 Thu Mar 22, 2018 9:50 pm

Well, it’s really neither of the two. It could have possibly been one of them at one time, but it’s been modified into something else. Something to clean up or use for parts or fly with without worry.

Enjoy!
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Post  rsv1cox Fri Mar 23, 2018 7:34 am

ticomareado wrote:Nicest looking used back plate I've seen in quite a while.

Yes, surprising considering how castor locked the reed was.  I was expecting a mess when I separated the plate from the tank.

----------------------

I couldn't find anything else in the book that even came close Ron.

It's a standard #3 cylinder polished for a throttle ring with a high compression head.  Perhaps it was grafted on a straight nose non grooved case that at one time housed a starter spring.

I rebuilt it the same only replacing gaskets, eliminating one of the reeds, and adding a spinner.  

The most curious part is the elimination of the two top cylinder fins.  That's a lot of effort just to clean up some damaged fins and the result is more bad than good cooling wise.  

Curious Cox 350 Babe Bee Finish12

Bob
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Post  batjac Fri Mar 23, 2018 9:34 am

Perhaps a home job to use on an RC boat with throttle and heat sink head?

The Stumped Mark
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Post  ticomareado Fri Mar 23, 2018 10:04 am

Good guess but I'd go with a heat sink head R/C car before an R/C boat on this one. A stock Baby Bee tank holds just enough fuel to get an R/C boat out in the middle of the lake and stop.
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Post  rsv1cox Fri Mar 23, 2018 10:20 am

It came with a propeller attached (top picture).

Each of these little engines has a story to tell.  

These for examples: One flight only, or lot's of fun.

Curious Cox 350 Babe Bee Cox_mi13

Or this one. Looks like it was stored in battery acid, yet the mounting screws and reed look new.

Curious Cox 350 Babe Bee Cox_mi10

Curious Cox 350 Babe Bee Cox_mi11

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Post  rsv1cox Fri Mar 23, 2018 10:32 am

ticomareado wrote:Good guess but I'd go with a heat sink head R/C car before an R/C boat on this one. A stock Baby Bee tank holds just enough fuel to get an R/C boat out in the middle of the lake and stop.

I trusted electric with mine.

Curious Cox 350 Babe Bee D_boat10

Curious Cox 350 Babe Bee D_boat11


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Post  66 Malibu Fri Mar 23, 2018 6:18 pm

Bob,
Regarding the two mylar reeds in place on the Baby Bee, a few years ago, one of the many things I acquired from the Cox R&D batch that showed up, was a Red Cox Shrike car with the Baby Bee pusher setup.
It was totally frozen solid which helped get a really good price from the guy.
Once I got it home and took it apart, it was apparent that the Shrike was a customer store return that made it all the way back to Cox.
The tank had been filled by the original purchaser and was left totally full of fuel for many years to end up as hard gel.
When I got it all apart finally, I found that there were actually two mylar reeds put in by the factory assembly person.
It would never start no matter what that caused it to end up back at the factory.
I totally cleaned it and replaced all seals, gaskets, and one reed and it is mint and never started, yet...
FWIW...Steve.....
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Post  getback Sat Mar 24, 2018 1:58 pm

I don't know about battery acid but i Know if you leave one in hobbys #9 for a month it will do that to it lol! Crying or Very sad
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Post  rsv1cox Sat Mar 24, 2018 3:01 pm

getback wrote:I don't know about battery acid but i Know if you leave one in hobbys #9 for a month it will do that to it lol! Crying or Very sad

The voice of experience. Smile Same will happen with Simple Green. Looks like someone did just that, then replaced the gaskets and reed.

BOb
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Post  ticomareado Sat Mar 24, 2018 3:32 pm

Forensic guess on photo of 4 engines:

Clockwise starting at upper left-- 1) Stuka, splat in a million pieces on parking lot first attempt to fly 2) PT- 19 with plenty of flight time

3) Lil' Stinker-- busted landing gear first flight 4) PT-19 low time, probably busted a little something or another in a normal training crash on grass
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Post  rsv1cox Sat Mar 24, 2018 3:42 pm

ticomareado wrote:Forensic guess on photo of 4 engines:

Clockwise starting at upper left-- 1)  Stuka, splat in a million pieces on parking lot first attempt to fly   2)  PT- 19 with plenty of flight time

3) Lil' Stinker-- busted landing gear first flight   4)  PT-19 low time, probably busted a little something or another in a normal training crash on grass

Excellent guess.

I just cleaned the 3 .049's (A/F boil) and the upper right PT-19 shows a lot of castor goo while the .020 and bottom PT-19 are quite clean. But I can't agree on #1, a parking lot splat would have lunched that spinner.
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