.049 Parts identification help

Sig Skyray Fri Jun 05, 2015 4:15 pm

I have this throttle ring below that fits perfectly around the first .049 cylinder I pulled out. Does anyone know the original application? Was it for a Tee Dee or part of a medallion throttle assembly or ? My research is finding nothing. And I assume the silicone or rubber cover is just protection when not in use.

Then there's this plate which partially blocks one of the exhaust ports. What are these plates used for?

Greg

**Admin** Fri Jun 05, 2015 4:28 pm

The first is a throttle muffler that came with the RC Bee in 1979. You're lucky that you have the rubber part, those are usually missing. According to the Cox Handbook, this kind of muffler was only used for one year and discontinued due to possible patent infringement with Murphy Muffler Inc.
.049 Parts identification help RC%20Bee%202

.049 Parts identification help RC%20Bee%202

Picture stolen from Bernie

The second is a exhaust deflector. These came on a few product engines and was also sold as a part so modelers could add them to other engines.

roddie Fri Jun 05, 2015 5:37 pm

I have a muffler-throttle kit cat. #3615. It includes a small venturi spacer-ring for the rotary valve engines. Medallions I suspect.

.049 Parts identification help Muffle11

Marleysky Fri Jun 05, 2015 7:59 pm

Heat Shield or Ehxaust Deflector mounts between the BackPlate and Crankcase.

Oldenginerod Sat Jun 06, 2015 2:41 am

roddie wrote:I have a muffler-throttle kit cat. #3615. It includes a small venturi spacer-ring for the rotary valve engines. Medallions I suspect.

I'm fairly certain that it was only the RC Bee that used the grey rubber ring as pictured.

Rod.

Sig Skyray Sat Jun 06, 2015 7:07 am

Admin wrote:The first is a throttle muffler that came with the RC Bee in 1979. You're lucky that you have the rubber part, those are usually missing. According to the Cox Handbook, this kind of muffler was only used for one year and discontinued due to possible patent infringement with Murphy Muffler Inc.

The second is a exhaust deflector. These came on a few product engines and was also sold as a part so modelers could add them to other engines.

Thanks Jacob. Nice to know the precise origin and application of the throttle.

On the heat shield, what's the benefit or specific application? Does it have any particular benefit to the 1/2A balsa flyer? It only extends 1/2 way up the port so I can't really see it doing much behind a prop blowing exhaust gases everywhere.

Greg

getback Sat Jun 06, 2015 8:24 am

Greg , The Exhaust Shield was also known as Heat deflector / Shield To help keep from burning your fingers while adjusting the product engine where the needling was behind the Exhaust port . As I think they stated turning the back plate in application's so as not to use this item .... If you use this Gasket both sides . The Muffler I have never used but did find it a PITA to keep the rubber on and work properly . tongue

roddie Sat Jun 06, 2015 1:45 pm

Oldenginerod wrote:
roddie wrote:I have a muffler-throttle kit cat. #3615. It includes a small venturi spacer-ring for the rotary valve engines. Medallions I suspect.

I'm fairly certain that it was only the RC Bee that used the grey rubber ring as pictured.

Rod.

Yes.. The RC Bee is probably the only engine that "came with" the TMS. Here's a picture of my Cox TMS kit's instruction sheet for use on a Babe Bee or Tee Dee .049. The Tee Dee app. surprises me.. because I thought that most Tee Dees had SPI cylinder porting.. which wouldn't work well when being restricted by a muffler.

.049 Parts identification help Muffle12

Check out the "filing of a notch" required of the Bee's tank, to clear the barrel.. Shocked

Ken Cook Sat Jun 06, 2015 2:26 pm

I have 2 beautiful Golden Bee tanks filed as shown which ruins them. They develop a crack directly on the filed slot and it leaks. I wish the owner didn't do that. Ken

Sig Skyray Mon Jun 08, 2015 6:34 pm

Thanks for that detail Roddie and others. I don't have the venturi spacer or spacer A that goes around the cylinder. That would be an easy fix though with some wire. The play is only 1/32" up and down on the cylinder.
Greg

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