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Just won a Cox .15 Sportsman
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Just won a Cox .15 Sportsman
Tonight I won a Sportsman,
a legacy reed valve .15. Am stoked.





Tax and shipping included, $81. I don't know what you folks think. To me, this is a rarer Cox to obtain. I think it is of greater value than the .15 Medallion. It does show signs of some mishandling by the combination pliers marks on the prop thrust plate, but otherwise appears clean, seller has a very high rating.
If it works out, I will be able to clean up the scarring on it with some carefully filing and polishing. Would be a good engine to power my 33 inch Midwest P-40 Warhawk.
Will know more when it is in my hands, hopefully in about a week.







Tax and shipping included, $81. I don't know what you folks think. To me, this is a rarer Cox to obtain. I think it is of greater value than the .15 Medallion. It does show signs of some mishandling by the combination pliers marks on the prop thrust plate, but otherwise appears clean, seller has a very high rating.
If it works out, I will be able to clean up the scarring on it with some carefully filing and polishing. Would be a good engine to power my 33 inch Midwest P-40 Warhawk.

Will know more when it is in my hands, hopefully in about a week.

GallopingGhostler- Top Poster
- Posts : 4071
Join date : 2013-07-13
Age : 69
Location : Clovis, NM, USA
Re: Just won a Cox .15 Sportsman
Very nice and congratulations George
….. Being from the early era with keen focus on precision I bet the fits are wonderful….Sounds like a nice mate to your similar era P-40….
I’m guessing the Cox may be a little narrower than other .15’s so you may have to adjust the mount a little but that would not be a problem…Also is probably a lighter engine so a little attention to build the tail lite making for an overall better flyer…..This will be a fun engine to tune up/shine up and make ‘er sing….Please let us know how it works out…
Robert

I’m guessing the Cox may be a little narrower than other .15’s so you may have to adjust the mount a little but that would not be a problem…Also is probably a lighter engine so a little attention to build the tail lite making for an overall better flyer…..This will be a fun engine to tune up/shine up and make ‘er sing….Please let us know how it works out…
Robert
rdw777- Platinum Member
Posts : 684
Join date : 2021-03-11
Location : West Texas
Re: Just won a Cox .15 Sportsman
Nice looking Sportsman , I was looking for the video of mine running some years ago but its been removed
Anyway it is a nice easy starter and ran good just a test run no plane for it though. I am sure you will enjoy the engine would love to see you get it mounted on a plane and give it a whirl !



getback- Top Poster
Posts : 9414
Join date : 2013-01-18
Age : 65
Location : julian , NC
Re: Just won a Cox .15 Sportsman
It's seems hard to find a Sportsman in decent shape. I have one that is junk, bought years ago. I like the way the Sportsman and Spacehopper look. The .15 must be awfully loud.
gkamysz- Gold Member
- Posts : 298
Join date : 2018-02-22
Location : Chicagoland
Re: Just won a Cox .15 Sportsman
Hello friend GallopingGhostler , congratulations on your new acquisition!
I have two Sportsman .15, I bought them separately, each one from their own owners, they are very little used.
I made some modifications, without damaging the original parts, so if you remove the parts you put on, you can return it to its original state.
What I did was adapt the carb from a .30 4 stroke engine, just use the barrel air valve to get control of the rpm and that's how I converted them to RC.
I also made a muffler for one of them, as it is very noisy, it really makes a lot of noise and with the muffler it is a pleasure.
Here I leave some videos.
I have dedicated part of this work to Mr. Dale Kirn, who was the creator of the Stortsman .15 engine.
A shout out to my friend Brad who gave me the idea to put in an air valve for engine control.
P.S. I love your cover photo!! LLLLUUUUPPPPIIIINNNNN

I have two Sportsman .15, I bought them separately, each one from their own owners, they are very little used.
I made some modifications, without damaging the original parts, so if you remove the parts you put on, you can return it to its original state.
What I did was adapt the carb from a .30 4 stroke engine, just use the barrel air valve to get control of the rpm and that's how I converted them to RC.
I also made a muffler for one of them, as it is very noisy, it really makes a lot of noise and with the muffler it is a pleasure.
Here I leave some videos.
I have dedicated part of this work to Mr. Dale Kirn, who was the creator of the Stortsman .15 engine.
A shout out to my friend Brad who gave me the idea to put in an air valve for engine control.
P.S. I love your cover photo!! LLLLUUUUPPPPIIIINNNNN


MauricioB- Top Poster
- Posts : 3336
Join date : 2016-02-16
Age : 51
Location : ARG
Re: Just won a Cox .15 Sportsman
Congrats, George! I'm sure you will have it looking a treat when you get your hands on it. I've always thought the Sportsman had a sleek and fast look to it.
I have one, never run, that likely will stay that way. I expect it will end up in some estate sale for $10.
I have one, never run, that likely will stay that way. I expect it will end up in some estate sale for $10.

Re: Just won a Cox .15 Sportsman
Thank you all, for the encouragement! Helps me to know I made the right decision to purchase it! More to follow when I receive it.
Tengo muchas gracias cuando en otro foro encontraba esa enlace de red. I am very thankful when in another forum I found that network link.
I see a potential winner for the next monthly Cox Engine Contest.
Eses videos son muy interesante, también tu obra propria como un mecanico ¡es muy excelente! These videos are very interesting, also your own work as a mechanic is very excellent!MauricioB wrote:I have two Sportsman .15, [...] I made some modifications, without damaging the original parts, [...] What I did was adapt the carb from a .30 4 stroke engine, just use the barrel air valve to get control of the rpm and that's how I converted them to RC. I also made a muffler for one of them, [...] Here I leave some videos. I have dedicated part of this work to Mr. Dale Kirn, who was the creator of the Sportsman .15 engine. [...]
Lo me gusta mucha la revista de Lúpin porque la ayudame comprender el idioma de español. I really like Lúpin magazine because it helps me to learn the Spanish language. Yo lo leo a menudo. I read it often. También lo dame una razón que reírse. Plus, it gives me a reason to laugh.MauricioB wrote:P.S. I love your cover photo!! LLLLUUUUPPPPIIIINNNNN![]()

Yo veo un ganador potencial para el próximo concurso mensual del motor de Cox.

Last edited by GallopingGhostler on Sat Mar 18, 2023 6:30 am; edited 1 time in total (Reason for editing : He corregido la ortografía de «comprender».)
GallopingGhostler- Top Poster
- Posts : 4071
Join date : 2013-07-13
Age : 69
Location : Clovis, NM, USA
1/2A Nut- Top Poster
Posts : 3289
Join date : 2013-10-20
Age : 59
Location : Brad in Texas
Re: Just won a Cox .15 Sportsman
Brad, love those aftermarket throttle rings, they permit SPI to work effectively yet allow the engine to properly idle. Also, yours have the snap starter, was this aftermarket, too? Too bad Cox discontinued the Sportsman (and Olympic).
I gather that it was a cost cutting measure, the Tee Dee derivative, the Medallion .15 was cheaper to produce since it used the base parts (crankcase, crankshaft, and upper parts with one less bypass) from the Tee Dee with less expensive and simpler machining, simplified venturi system, with at least the same power as the Sportsman.
GallopingGhostler- Top Poster
- Posts : 4071
Join date : 2013-07-13
Age : 69
Location : Clovis, NM, USA
Re: Just won a Cox .15 Sportsman
thank you for your comment.
The Sportsman also has another extra advantage, it can rotate the propeller clockwise or counterclockwise, when experimenting with models and propellers, the engine is a great contribution.
You know, my Sportsman has never been planted, it always runs perfectly, it doesn't need to pressurize the tank, since the suction generated by the crankcase is more than enough in sharp climbs.
I like the Sportsman! ... making the silencer is another great advantage, you can fly it in any club, since the desibeles are allowed and it's nice, I DO NOT DISTURB the marching sound of it.
A few years ago I presented it in the Engine of the Month, but it did not get many votes, I suppose that many people have not used it with all the possibilities that this engine has, I think that if you have a Sportsman .15 soon, you will have an engine with many possibilities of use.
Maybe I'll present it again in the engine of the month, who knows!
The Sportsman also has another extra advantage, it can rotate the propeller clockwise or counterclockwise, when experimenting with models and propellers, the engine is a great contribution.
You know, my Sportsman has never been planted, it always runs perfectly, it doesn't need to pressurize the tank, since the suction generated by the crankcase is more than enough in sharp climbs.
I like the Sportsman! ... making the silencer is another great advantage, you can fly it in any club, since the desibeles are allowed and it's nice, I DO NOT DISTURB the marching sound of it.
A few years ago I presented it in the Engine of the Month, but it did not get many votes, I suppose that many people have not used it with all the possibilities that this engine has, I think that if you have a Sportsman .15 soon, you will have an engine with many possibilities of use.
Maybe I'll present it again in the engine of the month, who knows!
MauricioB- Top Poster
- Posts : 3336
Join date : 2016-02-16
Age : 51
Location : ARG
Re: Just won a Cox .15 Sportsman
Currently there is a Cox Sportsman .15 for sale on the RC Groups classified section for $60.00
Click on the link below to go straight to it:
Cox Sportsman .15 for sale --- $60.00
Just a heads up for you Sportsman guys that just posted here?
Click on the link below to go straight to it:
Cox Sportsman .15 for sale --- $60.00
Just a heads up for you Sportsman guys that just posted here?
sosam117- Platinum Member
- Posts : 989
Join date : 2016-03-23
Location : Suburb of Chicago, Illinois
Re: Just won a Cox .15 Sportsman
here is a model airplane enjoying a Comanche with a Storsman .15...surely it will take many of them back in time.
Although I was born in 1971, I feel that the time from 1958 onwards regarding all these Cox creations, must have been a great encouragement to many enthusiasts, I think it must have been a wonderful time for the hobby and for Cox!
Although I was born in 1971, I feel that the time from 1958 onwards regarding all these Cox creations, must have been a great encouragement to many enthusiasts, I think it must have been a wonderful time for the hobby and for Cox!
MauricioB- Top Poster
- Posts : 3336
Join date : 2016-02-16
Age : 51
Location : ARG
Re: Just won a Cox .15 Sportsman
Today It arrived, now have it in my hands. It sort of resembles a rear rotor Tee Dee, if Cox were ever to make one.
It has new like compression indicating that it was probably run, but not much. The plier marks on the prop thrust washer isn't as bad as it appears in the photos. The burrs will clean up nicely with some very gentle filing and rubbing down with Mother's Mag and Aluminum Polish. It resembles a rear intake Tee Dee, does not use SPI, which is interesting. Entonces el silenciador hecho por Marcio estaba práctico porque el motor no tenga SPI.
Then the silencer by Maricio was practical as the engine has no SPI.
The top fin on the steel cylinder does show some pliers tooling marks, but not bad also. Some gentle filing of the burrs on the fin and touch up with bluing with clean that up.
Someone did clean and oil it because it shows no Castor drag. The glow head looks new without any clip marks on it.
Regarding loudness, I imagine it will probably be as loud as a Testors .19 Red Head or OK Cub .14/.19. Anyone who flies unmuffled control line aircraft will probably feel comfortable with its sound.
More to come ...
It has new like compression indicating that it was probably run, but not much. The plier marks on the prop thrust washer isn't as bad as it appears in the photos. The burrs will clean up nicely with some very gentle filing and rubbing down with Mother's Mag and Aluminum Polish. It resembles a rear intake Tee Dee, does not use SPI, which is interesting. Entonces el silenciador hecho por Marcio estaba práctico porque el motor no tenga SPI.

The top fin on the steel cylinder does show some pliers tooling marks, but not bad also. Some gentle filing of the burrs on the fin and touch up with bluing with clean that up.
Someone did clean and oil it because it shows no Castor drag. The glow head looks new without any clip marks on it.
Regarding loudness, I imagine it will probably be as loud as a Testors .19 Red Head or OK Cub .14/.19. Anyone who flies unmuffled control line aircraft will probably feel comfortable with its sound.
More to come ...
GallopingGhostler- Top Poster
- Posts : 4071
Join date : 2013-07-13
Age : 69
Location : Clovis, NM, USA
GallopingGhostler- Top Poster
- Posts : 4071
Join date : 2013-07-13
Age : 69
Location : Clovis, NM, USA

» *Cox Engine of The Month* Submit your pictures! -April 2021-
» Sportsman .15
» Sportsman .15
» New Sportsman .15
» Sportsman with twin-bypass cylinder??
» Sportsman .15
» Sportsman .15
» New Sportsman .15
» Sportsman with twin-bypass cylinder??
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