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Cox Babe Bee later-model backplate venting
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Cox Babe Bee later-model backplate venting
I am curious whether or not this vent arrangement may have been to minimize fuel-siphoning when inverted; as compared to the original..? There's still two vents..
My engine; as received from a fella down the road ("Dennis in Millville").. one of "two" Cox engines in a boxful of engines he gave me, one day a few years ago.

There was no needle.. but the spray-tube is clear. There is also no mesh-screen covering the air-intake.

The original dual-nipple back-plate actually allowed for connecting the two vents together via a flexible fuel-line looping "under"... with a slit/vent for when inverted. It's a nice trick.. but you don't have a lot of time to show-off with 5cc's...



My engine; as received from a fella down the road ("Dennis in Millville").. one of "two" Cox engines in a boxful of engines he gave me, one day a few years ago.

There was no needle.. but the spray-tube is clear. There is also no mesh-screen covering the air-intake.

The original dual-nipple back-plate actually allowed for connecting the two vents together via a flexible fuel-line looping "under"... with a slit/vent for when inverted. It's a nice trick.. but you don't have a lot of time to show-off with 5cc's...


Last edited by roddie on Thu Mar 04, 2021 7:18 pm; edited 1 time in total (Reason for editing : photos....)
Re: Cox Babe Bee later-model backplate venting
The backplate is befor the plastiques one like the one used for texaco
davidll1984- Diamond Member
- Posts : 2093
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Re: Cox Babe Bee later-model backplate venting
AFAIK Roddie, right you are. I've see this application before, and it
makes sense if you stare at it for a while. My senses are a little skewed
at the moment, so I won't try to explain, but trust me, it does work.
Bob
makes sense if you stare at it for a while. My senses are a little skewed
at the moment, so I won't try to explain, but trust me, it does work.
Bob
dckrsn- Diamond Member
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Join date : 2010-10-21
Age : 70
Location : Long Island, New York
Re: Cox Babe Bee later-model backplate venting
I never thought about it that way
It does seem plausible though. In C/L flying, you have most of your fuel in the right side of the tank. That’s why you have the fuel pickup pointing right too, obviously. Having the vent on the left prevents fuel leaking when inverted. No fuel => no leak. Genious
Too bad they came up with it pretty late, I think that style was introduced in the early ’80s, around the time when dual slit exhausts became standard. I bought my first Babe Bee in 1983 or so, it had that kind of backplate, dual slit exhausts and a brass driveplate with the red starter cam. Just like the one in the picture.

It does seem plausible though. In C/L flying, you have most of your fuel in the right side of the tank. That’s why you have the fuel pickup pointing right too, obviously. Having the vent on the left prevents fuel leaking when inverted. No fuel => no leak. Genious

Too bad they came up with it pretty late, I think that style was introduced in the early ’80s, around the time when dual slit exhausts became standard. I bought my first Babe Bee in 1983 or so, it had that kind of backplate, dual slit exhausts and a brass driveplate with the red starter cam. Just like the one in the picture.
KariFS- Diamond Member
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Age : 51
Re: Cox Babe Bee later-model backplate venting
The story I heard about the slit cylinder and the Backplate vent were due to product liability concerns.
Slit cylinder reduced fire potential
Vent arrangement prevented fuel spurting into a child's eyes. The filler bulb tube partially covered the flush air vent
Slit cylinder reduced fire potential
Vent arrangement prevented fuel spurting into a child's eyes. The filler bulb tube partially covered the flush air vent
fredvon4- Top Poster
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Re: Cox Babe Bee later-model backplate venting
Yes story make sense it hapen To me once and nitro in eyes its bad and taste disgusting fuel in face lol dont smoke at same time


davidll1984- Diamond Member
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Re: Cox Babe Bee later-model backplate venting
yea... Phred's explanation makes perfect sense. People be Lawyr'n-up. Better call Saul... S'all good man..!


Re: Cox Babe Bee later-model backplate venting
Roddie the vent arrangement you show was talked about at length by Ken Cook about 6yrs ago. I was sick and tired of flame outs while inverted. It impeded my learning so much I just decided that engines with either a stunt tanks or standard are better suited for roundy round or speed. TD and Medallion are the way to go for just about everything.
Cribbs74- Moderator
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Re: Cox Babe Bee later-model backplate venting
An interesting topic. I had also seen that arrangement before, and was wondering about it. That is until Fred came to the rescue with his answer. Of which makes total sense. While I have not fuelled up an engine lately, I do remember filling them up and having the fuel squirting straight up and out the other vent.
NEW222- Top Poster
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