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Tarno 1/2 AR details
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Jason_WI- Top Poster
Posts : 3123
Join date : 2011-10-09
Age : 48
Location : Neenah, WI
Re: Tarno 1/2 AR details
Pretty cool! The carb Tarno made for Tee Dees were vary popular back in the seventies to mid eighties, however this is the first time I've seen one designed for a Babe Bee?
I have a carb (throttle control) made by ACE for a Babe Bee (Cox Reedie) which is basically a tapered metering rod that moves in and out of the backplate venturi.
Mark
p.s. I like your info on molding, it's about the same as used to make HO slot car bodies...you could make Stuka antennas and sell 'em on ebay!
I have a carb (throttle control) made by ACE for a Babe Bee (Cox Reedie) which is basically a tapered metering rod that moves in and out of the backplate venturi.
Mark
p.s. I like your info on molding, it's about the same as used to make HO slot car bodies...you could make Stuka antennas and sell 'em on ebay!
same carb? sweet
I do believe that is the same carb as the teedee carb, it looks to be from what I can see. they were said to be a good carb, I never managed to get my hands on one yet.
It appears they merely crafted a backplate carb/motor mount for the bee crankcase. look close at the pic taken from the rear, there is an adjustment screw that may be dificult to reach when mounted on the plane.
I also assume they provided for a reed retainer of some sort within the crankcase.
I was working on a similar design, thats on the workbench here somewhere lol
Sweet set-up you have there, can I ask where you got it?
It appears they merely crafted a backplate carb/motor mount for the bee crankcase. look close at the pic taken from the rear, there is an adjustment screw that may be dificult to reach when mounted on the plane.
I also assume they provided for a reed retainer of some sort within the crankcase.
I was working on a similar design, thats on the workbench here somewhere lol
Sweet set-up you have there, can I ask where you got it?
Jaspur_x- Banned
- Posts : 710
Join date : 2011-04-22
Age : 51
Location : Shanksville,Pa, yes that flight 93 place
Re: Tarno 1/2 AR details
http://www.mh-aerotools.de/airfoils/cox_3rdparty.htm
Scroll down. Maybe Martin would like a picture of the whole assembly, while your at it tell him to join the forum!
Scroll down. Maybe Martin would like a picture of the whole assembly, while your at it tell him to join the forum!

Jason_WI- Top Poster
Posts : 3123
Join date : 2011-10-09
Age : 48
Location : Neenah, WI
Re: Tarno 1/2 AR details
Is there a way to upload PDF documents here? I have created a PDF of the assembly drawing but am unable to upload it.
Jason
Jason
Jason_WI- Top Poster
Posts : 3123
Join date : 2011-10-09
Age : 48
Location : Neenah, WI
Re: Tarno 1/2 AR details
I have that feature disabled since it takes up a huge amount of space. I tell users to use this site: http://www.filesavr.com/ Upload it there and then post the link here!
Re: Tarno 1/2 AR details
Jaspur_x wrote:
Sweet set-up you have there, can I ask where you got it?
I got it on RCG engine classifides last spring.
Jason_WI- Top Poster
Posts : 3123
Join date : 2011-10-09
Age : 48
Location : Neenah, WI
Re: Tarno 1/2 AR details
That's a nifty setup, never seen that before.
PV Pilot- High Tech Balsa Basher
- Posts : 1854
Join date : 2011-08-11
Age : 56
Location : The ragged end of the Universe.
Re: Tarno 1/2 AR details
Doesn't look tooooooo hard to make. Maybe one could make one up using a tee tee carb?
Bingo Nitro!!
I guess those backplates I have stashed in that box of projects to do, and that carb that just arrived today will be of handy use huh? lol
Jaspur_x- Banned
- Posts : 710
Join date : 2011-04-22
Age : 51
Location : Shanksville,Pa, yes that flight 93 place
Carb
Engine looks cool. Somebody had some extra time to do this. Nice work to say the least.
Dan
Dan


dankar04- Platinum Member
- Posts : 716
Join date : 2011-08-13
Age : 77
Location : Tucson,Az.
Re: Tarno 1/2 AR details
dankar04 wrote:Engine looks cool. Somebody had some extra time to do this. Nice work to say the least.
Dan![]()
![]()
I day thats great work and wish i had the time and skill to get really good at stuff like this!
yes
Nitroairplane, I agree, AND while I am at I want to do a peewee version just for giggles, even though I already have (throttled) teedee020`s lol
Jaspur_x- Banned
- Posts : 710
Join date : 2011-04-22
Age : 51
Location : Shanksville,Pa, yes that flight 93 place
Re: Tarno 1/2 AR details
Admin wrote:http://www.mh-aerotools.de/airfoils/cox_3rdparty.htm
Scroll down. Maybe Martin would like a picture of the whole assembly, while your at it tell him to join the forum!![]()
I sent Matrin pictures, a PDF drawing and a link to this thread last week and havent heard anything yet. He probably gets hundreds of emails a week to sift through.
Jason
Jason_WI- Top Poster
Posts : 3123
Join date : 2011-10-09
Age : 48
Location : Neenah, WI
Re: Tarno 1/2 AR details
Jason_WI wrote:Admin wrote:http://www.mh-aerotools.de/airfoils/cox_3rdparty.htm
Scroll down. Maybe Martin would like a picture of the whole assembly, while your at it tell him to join the forum!![]()
I sent Matrin pictures, a PDF drawing and a link to this thread last week and havent heard anything yet. He probably gets hundreds of emails a week to sift through.
Jason
I contacted him a couple 2-3 times in the past year or so, never any answers back.
jetpack- Gold Member
- Posts : 173
Join date : 2011-08-15
Age : 60
Location : Hobart, Indiana
Re: Tarno 1/2 AR details
The pictures of the carb in my first post are actually the incorrect carburetor for this version. The throttle stop screw is actually on the side of the carb for the AR version so it can be accessed through the small hole in the metal mount. The carb shown above is the regular TD version of the carb. What I bought on RC Groups many moons ago wasn't correct.
Jason_WI- Top Poster
Posts : 3123
Join date : 2011-10-09
Age : 48
Location : Neenah, WI
Re: Tarno 1/2 AR details
here's a TeeDee Tarno carb that just popped up.
https://www.ebay.com/itm/VINTAGE-TARNO-1-2A-COX-TEE-DEE-049-051-R-C-CARBURETOR-MODEL-AIRPLANE-ENGINE-NEW/352950577485?hash=item522d7e694d:g:8n4AAOSwoCFeL5nQ
Bob

https://www.ebay.com/itm/VINTAGE-TARNO-1-2A-COX-TEE-DEE-049-051-R-C-CARBURETOR-MODEL-AIRPLANE-ENGINE-NEW/352950577485?hash=item522d7e694d:g:8n4AAOSwoCFeL5nQ
Bob
dckrsn- Diamond Member
Posts : 2750
Join date : 2010-10-21
Age : 70
Location : Long Island, New York
Re: Tarno 1/2 AR details
Jason_WI wrote:The pictures of the carb in my first post are actually the incorrect carburetor for this version. The throttle stop screw is actually on the side of the carb for the AR version so it can be accessed through the small hole in the metal mount. The carb shown above is the regular TD version of the carb. What I bought on RC Groups many moons ago wasn't correct.
Well, I bought two 1/2AR Tarno carbs new in the bag from Tower Hobbies back in the late 70's. Never ran them. Just purchased them for one day. Now looking at mine, it's the same as yours.

Why did they give a TD carb (throttle stop next to venturi) and then supply the reed adapter for the 1/2AR package? Was the hole in the mounting plate absolutely necessary for barrel adjustment with the TD carb on the 1/2AR package? Maybe not?
What is available on the auction site is a true 1/2AR carb with the barrel stop adjustment on the side of the carburetor.

Somewhat confusing yet more understandable with a picture.

DrCox- Gold Member
- Posts : 229
Join date : 2018-07-18
Location : Wisconsin
Re: Tarno 1/2 AR details
Decided to look further in my engine box of forgotten memories. Now I am beginning to wonder what type of quality control Tarno had with package assembly. Both were originally order as 1/2AR carburetors and received in the same shipment. Not ordered as a separate Tarno TD and a AR carb. Both carbs are exactly as I received them new. The AR carb has a pre-filed notch on the needle valve whereas the TD needle valve is missing the needle valve notch.



DrCox- Gold Member
- Posts : 229
Join date : 2018-07-18
Location : Wisconsin
Re: Tarno 1/2 AR details
Just a heads-up that the original Tarno carb pictured for sale changed from the Tarno 1/2AR to the Tarno 1/2A T/D carb.




DrCox- Gold Member
- Posts : 229
Join date : 2018-07-18
Location : Wisconsin
Re: Tarno 1/2 AR details
I have a few and use them. The aluminum body is harder than that of the COX RC carb therefore it wont lose the throttle adjustment screw if the engine vibrates. I have lost a few screws from COX RC carbs where the softer aluminum thread in the carb body loosens and even a prestressed spring will not retain the screw from unscrewing.
The throttle arm is mounted on the barrel with just tightening the nut and is held down with a soft plastic washer. So the servo can overrun the wide open or fully closed barrel positions without mechanical damage to the servo because the throttle arm turns on the shaft freely with some excess torque that you set by the extent of tightening the nut.
The bronze fuel nipple is a blessing versus the black plastic nipple on the COX, see my respective thread and the beautiful bronze replacement nipples made by Dave and Mauricio for the COX carb.(I will DIY one from a TeeDee 020 NV body when hit home later today).
Works well although the airbleed is fixed whereas you can play with that with a 2nd screw on the COX RC carb. I wish I had one for my TD09 that I saw on Brad's engine I guess. My 09 size is COX RC carb.
The throttle arm is mounted on the barrel with just tightening the nut and is held down with a soft plastic washer. So the servo can overrun the wide open or fully closed barrel positions without mechanical damage to the servo because the throttle arm turns on the shaft freely with some excess torque that you set by the extent of tightening the nut.
The bronze fuel nipple is a blessing versus the black plastic nipple on the COX, see my respective thread and the beautiful bronze replacement nipples made by Dave and Mauricio for the COX carb.(I will DIY one from a TeeDee 020 NV body when hit home later today).
Works well although the airbleed is fixed whereas you can play with that with a 2nd screw on the COX RC carb. I wish I had one for my TD09 that I saw on Brad's engine I guess. My 09 size is COX RC carb.
balogh- Top Poster
Posts : 4608
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
Re: Tarno 1/2 AR details
back in motorcycle days I got real tired of not being able to remove JIS steel screws from aluminum housings.....and carb screws that vibrated loose.....dissimilar metal corrosion
old fart mechanic at a NAPA parts counter.....
remember when we could sit, smoke and BS..
anyway old guy listening to my carping gets up and finds the package and hands me anti seize compound tube
45 years later I still have that tube........very very little is needed
tight fasteners will release when commanded by correct tool
loose fit low torque stuff will mostly stay put
there is a point in here I tink
old fart mechanic at a NAPA parts counter.....
remember when we could sit, smoke and BS..
anyway old guy listening to my carping gets up and finds the package and hands me anti seize compound tube
45 years later I still have that tube........very very little is needed
tight fasteners will release when commanded by correct tool
loose fit low torque stuff will mostly stay put
there is a point in here I tink
fredvon4- Top Poster
Posts : 3997
Join date : 2011-08-26
Age : 68
Location : Lampasas Texas
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» details details don't bother me with details...
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» throttle backplate
» Cox Olympic Rear Drum Valve engine details. Now with Video!!!!
» Ohlsson Commemorative made by Herb Wall - 1980's - Boxed & new !!! / SOLD
» Anybody up for a "Stik" build off?
» throttle backplate
» Cox Olympic Rear Drum Valve engine details. Now with Video!!!!
» Ohlsson Commemorative made by Herb Wall - 1980's - Boxed & new !!! / SOLD
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