Thoughts on buying a tee dee rc 09?

Based on the proportions, it looks to be an 09. My .074 has just about that same nipple on the carb, and it hasn’t broken yet but it appears the td-rc is modular, unlike the 074, so I could probably 3d print a new one. Thanks for letting me know!

holy crap i just found a nib scorpion up for bid
if i get this engine... and the plane... thats gonna be incredible

looks like i may be in luck if the engine falls through...
https://www.ebay.com/itm/313715446840?hash=item490ae5d438:g:FY8AAOSwLgRhbM74

I GOT IT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! WOOOOOOOOOOOOOOOOOOOOOOOHOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO

Just a stupid question regarding the carburetor on these engines. Are they air bleed type, or are there an independant high and low speed needle adjustments on them? Never seen one personally, so do not know.

Lukemiester wrote:holy crap i just found a nib scorpion up for bid
if i get this engine... and the plane... thats gonna be incredible

hopefully a cox scorpion brad.

NEW222 wrote:Just a stupid question regarding the carburetor on these engines. Are they air bleed type, or are there an independant high and low speed needle adjustments on them? Never seen one personally, so do not know.

i'm pretty sure these ones are airbleed, i know the 074 is not. i have a fixed airbleed on mine, however.

Interesting, thanks for the information. I just really got wondering when I actually started thinking of how small the carburetors are and how they are tuned.

Its a TD .09 You can tell by the drive plate has a extrusion for the prop fit the .049 s don't .

getback wrote:Its a TD .09 You can tell by the drive plate has a extrusion for the prop fit the .049 s don't .

Thanks, didn’t know that. My .074 has that too.

To answer the question of the carburettor neither the .074 or the rc tee dee .o49 .09 uses a second neadle for the idle speed it uses the same system air bleed type excep the .074 Didn't have the hole and screw Which is easily installed a simple modification Good Find on that .09 rc Mine is attached to a big stick designed for a .10 the cox .09 rc a Very good little engine with good power To weight ratio

Another way of distinguishing the Cox Tee Dee .049 R/C from its .09 R/C big brother is that while the .049 has a conventional Cox glow head, the .09 R/C has regular short glow plug in an adapted glow head.

Bob Aberle did a review of both engines in Flying Models:
http://sceptreflight.com/Model%20Engine%20Tests/Cox%20Tee%20Dee%2009%20RC%20and%20051%20RC.html

The muffler used on the .09 R/C also fits the Cox .074 Queen Bee R/C.

Michael in Ontario, Canada

The muffler -I guess, "can"- is the same as the .074, however the manifold is different. on the 074 it's one piece and is indexed by the carb manifold. On the RC 09 it's indexed by the venturi and is two piece.
fun fact

Lukemiester wrote:The muffler -I guess, "can"- is the same as the .074, however the manifold is different. on the 074 it's one piece and is indexed by the carb manifold. On the RC 09 it's indexed by the venturi and is two piece.
fun fact

I don't understand what you mean by "manifold"...... part of the exhaust system or part of the carb or ?

The carburetors on .074 and TeeDee .09 R/C are certainly different but the exhaust system on the two engines are pretty much the same except for a bit of cosmetics and, I would assume, interchangeable.   I have both engines.

regards

Michael in Ontario, Canada

michaely wrote:

I don't understand what you mean by "manifold"...... part of the exhaust system or part of the carb or ?

I’m talking about the part that’s between the muffler and the cylinder and the part that’s between the carburetor and the crankcase

Lukemiester wrote:

michaely wrote:

I don't understand what you mean by "manifold"...... part of the exhaust system or part of the carb or ?

I’m talking about the part that’s between the muffler and the cylinder and the part that’s between the carburetor and the crankcase

OK, now I understand.

The muffler assembly for Queen Bee .074 R/C and the Tee Dee .09 R/C are the same size and attach to the engine cylinder the same way.

As you mentioned the lower rim of the muffler manifold indexes/keys to the carburetor bodies of the two engine in a slightly differ way.

To mount the .074 R/C muffler assembly to the Tee Dee .09 R/C, one would need to file a  small (1/8" notch) into the lower rim of manifold to key into a small plastic nub on the carb assembly.

The rear lower rim on the manifold of The .09 R/C already has a "flat" that I believe would key/index to the body of the carb on the .074 R/C.

regards

Michael in Ontario, Canada

michaely wrote:........The rear lower rim on the manifold of The .09 R/C already has a "flat" that I believe would key/index to the body of the carb on the .074 R/C.

regards

Michael in Ontario, Canada

I guess that flat is cut on the rim  also to allow the close mounting of the 09 into a usual engine mount. Without the flat, the rim would bump into the face of the engine mount and necessitate the placement of the engine more forward.

But it’s beveled
Maybe cox made the 074’s manifold then milled out the top and cut the slot in the front to keep costs down