The Ghost

Hi all,
I am after some info on the McCoy 60, I would like to know the thread and pitch size of the venturi thread(shown in photo) in the back plate?, and has any one made a muffler for one?
I am thinking of fitting a RC carby to run one in a vintage model.
Cheers
Andrew

init4fun

Hi Andrew, I don't know the thread size your looking for, but I do have a suggestion for your muffler. Back in the day, before engines regularly came with mufflers, we used metal bands or straps to attach aftermarket mufflers to our engines. In these pics, which are of more modern engines than your McCoy, these methods are a good representation of how we attached them.

Truckracer

My Feedback: (19)

I love these old engines and used some of them back in the day. But if you intend to use one for regular flying, you'd be better served using a modern engine. a modern engine will give you far better service. If you are just into the novelty of using an old engine and the fun of getting one going again, more power to you!! Many carbs can be mated to the engine with a bit of ingenuity but will probably require some machining. For both carbs and mufflers, Ebay sources for OS, Enya and other brands can yield some useful parts that can be adapted to the McCoy. As stated earlier, many strap on mufflers from the late 60's into the 70's should work well. On your original question, I have no idea what the thread size is for the venturi but you'll learn quickly as you start adapting parts. Have fun!

GREG DOE

Andrew, I was hoping that someone with personal experience would have responded, but that hasn't happened. My concern is that a 70 year old engine that uses a rotary disc induction might (I said might, because I don't know) not idle with a front induction carburetor. There are disc valve engines run with carburetors, but the timing might be different then on an engine designed for wide open running?

The Ghost

init4fun, I have 3 OS15's that run that setup with the band, may have to resort to this.
Truckracer, Not a problem with machining stuff(fitter and machinist) will have to work with a banded muffler, May have to machine what I need.
GREG DOE, I run many rear rotor/drum intake engines and the carb is no different to front intake engines except for how they mount, many just bolt on.
Thanks for the replys,
Cheers
Andrew

Truckracer

My Feedback: (19)

Few of those old engines had what you would call radical timing, either cylinder intake / exhaust ports or rotary intake so they will usually run OK when converted to glo RC operation. Most conversions I have seen or done over the years disappoint the user from a performance and durability standpoint as they tend to wear out or break quickly. Still good fun to play with and an important part of modeling. I always enjoy the rare sight of an old airplane design flying with an old engine. But I also enjoy watching a newly built, doped finish plane flying with modern electric power because it never gets gooped up with glo fuel residue and can stay pristine for years.

The Ghost

Hi All,
I may have the carby sorted, picked this up, just have to wait for it to arrive. Will be able to check intake and port timing and see if they are different.
Cheers
Andrew

Truckracer

My Feedback: (19)

Good looking old McCoy!

RyanNX211

The Ghost

Hi All,
Here is the McCoy 60 sparky running,

Cheers
Andrew

RyanNX211

I watched the whole thing

The Ghost

Hi All,
I think I may have found a way to make it a little quieter. May have some mill work to get it to fit with no leaks.
Cheers
Andrew

The Ghost

Hi All,
Machined up a piece of scrap alloy to get the correct dimensions to mill the muffler, I may just clean this piece up and use as a spacer between engine and muffler.
Cheers
Andrew

The Ghost

Hi All,
Have an adaptor machined, now just waiting on new bolts
Cheers
Andrew

The Ghost

Hi All,
Muffler fitted and engine running. It has taken the bark out of the exhaust. I will now open the internal baffles up and see how it go's
Cheers
Andrew

The Ghost

Hi All,
I now have the McCoy 60 running with muffler and on the flight pack
Cheers
Andrew

The Ghost

Hi All,
I have the carby sorted, now to see how it will run. Will test on the glow version, then try on the sparky.
Cheers
Andrew