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Testors/McCoy .049 smoked...

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Re: Testors/McCoy .049 smoked...

Post  Oldenginerod on Mon Sep 25, 2017 2:19 am

chevyiron420 wrote:Testors dropped the #1 or #2 after a wile.
Phil

Thanks Phil. They made so many little changes it's hard to keep up.
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parts engine arrived today!

Post  roddie on Thu Sep 28, 2017 6:56 pm

Update! Bob (rsv1cox) sent me a package with some cool stuff! Some Testors, Wen-Mac, OK Cub and Cox parts to boot!

Of immediate interest though; is one engine that looks exactly like the one I have.. right down to the "firewall" that it's mounted to.. and the fuel-line that's attached. The case-castings look the same to me..




Bob's engine is equipped with an exhaust-throttle-sleeve! Not sure if the cylinder is ground for it.. like some of the Cox cylinders were.



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Re: Testors/McCoy .049 smoked...

Post  Oldenginerod on Thu Sep 28, 2017 8:01 pm

Are you sure there's a throttle sleeve? Never seen one on a Testors. The Fly-em engines came with a metal ring which slipped over the bottom of the cylinder and was supposed to act as a muffler. (Far more effective at reducing RPM that dB.) It looks to me like just a variation in the cylinder. Check the picture of mine on the first page of this thread.

If you're anything like me, you will look at the original engine, along with the parts Bob supplied, and think that, with only a few more parts, I can make another running engine. So the search continues (I can't stand having "almost" enough parts to put together a running engine.)
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Re: Testors/McCoy .049 smoked...

Post  Oldenginerod on Fri Sep 29, 2017 6:10 am

On closer inspection, the engine Bob sent you has a much shorter intake than yours. This is what I've been saying. There are so many little subtle variations with these engines it's nearly impossible to know exactly what you have. Unless of course someone has trimmed it, but I suspect it was just one of those inexplainable changed they made during production.

Rod
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Re: Testors/McCoy .049 smoked...

Post  chevyiron420 on Fri Sep 29, 2017 4:52 pm

Wen mac kept changing the intake as well. Dont know why.
Phil
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Re: Testors/McCoy .049 smoked...

Post  chevyiron420 on Fri Sep 29, 2017 5:05 pm

I forgot to say, also the tall intake one has the newer smaller starter spring housing, making the intake look even taller. The wen macs with the hole drilled in the intake is for a return spring on a throttled engine. Even though they didnt all have throttles.
Roddies engine with that style glow head, and crank, and cylinder is probably near the end of production of that engine style.
Phil
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Re: Testors/McCoy .049 smoked...

Post  Jason_WI on Fri Sep 29, 2017 5:27 pm

I think I have some needles and NIP glow heads for these slag engines. I usually sell them off cheap or for the cost of shipping when I acquire them in Cox lots. Might even have a couple of the old fuel cans too.
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Re: Testors/McCoy .049 smoked...

Post  Marleysky on Fri Sep 29, 2017 7:09 pm

What's the shipping for your "slag" parts, NV, and fuel cans to 49544??
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Re: Testors/McCoy .049 smoked...

Post  chevyiron420 on Fri Sep 29, 2017 7:11 pm

Jason_WI wrote:I think I have some needles and NIP glow heads for these slag engines. I usually sell them off cheap or for the cost of shipping when I acquire them in Cox lots. Might even have a couple of the old fuel cans too.
What is a slag engine?
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Re: Testors/McCoy .049 smoked...

Post  TLAnderson on Fri Sep 29, 2017 8:11 pm

Oldenginerod wrote:Are you sure there's a throttle sleeve?  Never seen one on a Testors.  The Fly-em engines came with a metal ring which slipped over the bottom of the cylinder and was supposed to act as a muffler.  (Far more effective at reducing RPM that dB.)  



This one is from my Testors Albatross. The engine in my Sopwith Camel is identical, but doesn't have the ring around the cylinder.
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Re: Testors/McCoy .049 smoked...

Post  Jason_WI on Sat Sep 30, 2017 12:45 am

chevyiron420 wrote:
Jason_WI wrote:I think I have some needles and NIP glow heads for these slag engines. I usually sell them off cheap or for the cost of shipping when I acquire them in Cox lots. Might even have a couple of the old fuel cans too.
What is a slag engine?

Old-timers may remember the term, "slag engine." There were several engines made in the USA in the 1930s-1940s, sold mostly through a big store in New York City, that were junk right out of the box. They seemed to be made of the debris that floats on top of molten metal (slag), thus the name. Thor and Deezil were two of them.
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Re: Testors/McCoy .049 smoked...

Post  Oldenginerod on Sat Sep 30, 2017 12:59 am

chevyiron420 wrote:
Jason_WI wrote:I think I have some needles and NIP glow heads for these slag engines. I usually sell them off cheap or for the cost of shipping when I acquire them in Cox lots. Might even have a couple of the old fuel cans too.
What is a slag engine?
Otherwise known as "Pot Metal". That's why they're refered to as a "Pipe Bomb" engine. The ring on the Albatros engine is the muffler ring I refered to. The biggest issue when a muffler ring is installed is that you can't loosten the cylinder to remove it. It's there for life unless you use pliers on the fins, or make one of those handy dandy wooden clamps.
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Re: Testors/McCoy .049 smoked...

Post  roddie on Sat Sep 30, 2017 9:54 am

Oldenginerod wrote:Are you sure there's a throttle sleeve?  Never seen one on a Testors.  The Fly-em engines came with a metal ring which slipped over the bottom of the cylinder and was supposed to act as a muffler.  (Far more effective at reducing RPM that dB.)  It looks to me like just a variation in the cylinder.  Check the picture of mine on the first page of this thread.

If you're anything like me, you will look at the original engine, along with the parts Bob supplied, and think that, with only a few more parts, I can make another running engine.  So the search continues (I can't stand having "almost" enough parts to put together a running engine.)

You're correct Rod, The cylinder on Bob's engine has a "thick-wall" in the exhaust-port area. I guess it looked like a sleeve to me at first glance.



As mentioned; the venturi-stacks are different heights.. and the spring-starters have differing diameters.

That spring-starter assembly must be 1/2 the engine's weight. I suppose that Testors may have designed it that way to help counter-balance their heavy plastic model-airplanes? They obviously could have gone with a more simple coil-spring and drive-plate.
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Re: Testors/McCoy .049 smoked...

Post  roddie on Sat Sep 30, 2017 10:25 am

I knew I wasn't crazy.. Laughing  I just had the wrong engine. This Wen-Mac that Bob sent, has the throttle.




The spring wasn't attached.. and I'm not sure whether I installed it correctly. The sleeve has a single small hole.. and the venturi-stack also has a small hole. I don't see a place to hook-up a linkage though.. Huh... There "is" an e-clip around the base of the cylinder.. but it looks like it serves as a stop-plate/bearing for the sleeve to rotate on. There's nothing keeping the sleeve from riding "up" on the cylinder, except the return-springs' tension. Remove the return-spring, and the sleeve can be removed over the top of the cylinder.
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Re: Testors/McCoy .049 smoked...

Post  rsv1cox on Sat Sep 30, 2017 11:33 am

I did a little research on that engine roddie when I first received it.  Seems I traced it back to a particular Wen-Mac model, but I forget which one.  Sad

I suspect that Mark B. has the answer.

Bob
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Re: Testors/McCoy .049 smoked...

Post  chevyiron420 on Sat Sep 30, 2017 3:25 pm

Looks like a Mark XIII thunderbolt car engine. Press off the flywheel, drill and press on a cox drive plate. Go flyin!!!
Phil
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Re: Testors/McCoy .049 smoked...

Post  roddie on Sat Sep 30, 2017 4:05 pm

I have absolutely no experience/knowledge with these engines. It seems that both the AMF/Wen-mac and Testors/McCoy .049 engines utilize that heavy fly-wheel on the nose of the crankshaft in the form of a starter-spring assembly.. or otherwise. Was its purpose to keep the engine within it's design-rpm limits? Maybe the extra mass was needed for sustaining rotational-inertia to keep the engine running?

:huh:It's a heavy piece; to be fitted to such an otherwise lightweight engine-design.
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Re: Testors/McCoy .049 smoked...

Post  Marleysky on Sat Sep 30, 2017 5:58 pm

roddie wrote:I knew I wasn't crazy.. Laughing  I just had the wrong engine. This Wen-Mac that Bob sent, has the throttle.




The spring wasn't attached.. and I'm not sure whether I installed it correctly. The sleeve has a single small hole.. and the venturi-stack also has a small hole. I don't see a place to hook-up a linkage though.. Huh... There "is" an e-clip around the base of the cylinder.. but it looks like it serves as a stop-plate/bearing for the sleeve to rotate on. There's nothing keeping the sleeve from riding "up" on the cylinder, except the return-springs' tension. Remove the return-spring, and the sleeve can be removed over the top of the cylinder.

That is a throttle control sleeve , spring actuated by a third string attached to the flying handle. I'll see if is can locate the instruction sheet or picture of model. Yes, Mark B will know more about it.
That flywheel was/is heavy. That's why I always assumed Testors models flew slower. I put one on a Big Otto an it screamed.

Try this linc: https://goo.gl/images/g11BxU
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Re: Testors/McCoy .049 smoked...

Post  roddie on Sun Oct 01, 2017 8:45 am

Marleysky wrote:

That is a throttle control sleeve , spring actuated by a third string attached to the flying handle. I'll see if is can locate the instruction sheet or picture of model. Yes, Mark B will know more about it.
That flywheel was/is heavy. That's why I always assumed Testors models flew slower. I put one on a Big Otto an it screamed.

Try this linc:  https://goo.gl/images/g11BxU


Thanks Rene, That image-scan of a Testors instruction manual does show the throttled engine and how to start it. Too bad it doesn't show the throttle linkage in more detail.

That's ok... I'm just naturally curious about how it's supposed to operate.

Note the bent rod/wire with a loop on its end. I don't have that part.. but if it's the only missing part, would be easy to make.

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Re: Testors/McCoy .049 smoked...

Post  Marleysky on Mon Oct 02, 2017 8:56 pm

Aaahhh! I found it!! Indy racer and peashooter both used throttle control:

https://m.youtube.com/watch?feature=youtu.be&v=qzls1EtwsP4
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Re: Testors/McCoy .049 smoked...

Post  roddie on Tue Oct 03, 2017 1:57 am

Marleysky wrote:Aaahhh! I found it!! Indy racer and peashooter both used throttle control:

https://m.youtube.com/watch?feature=youtu.be&v=qzls1EtwsP4

Those were pretty cool models Rene!! How many kids of our generation wouldn't have wanted the hovercraft in the 2nd half of the vid? That must have preceded the "Galax IV" model that Testors created. It sure would be fun to try making one. A simple shallow box with engine mounted in a central duct suspended on an x-frame made from small CF rods with a firewall that clamps to it. Eyebrows The wheels in Roddie's head are turning...... Shocked
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Re: Testors/McCoy .049 smoked...

Post  Oldenginerod on Tue Oct 03, 2017 5:16 am

I actually started to build a hovercraft when I was in high school. Pretty sure I got the idea from a Popular Mechanics article and was made of balsa with a vertical cardboard tube to mount my Cox P-40 engine in, not realizing at the time that the tank wouldn't work in a vertical situation. I recalled the plans called for a realistic flexible skirt, which is what stopped the project in its tracks. I just couldn't figure out a way to do it, so the project languished until I gave up and binned the part-built model. If only I'd seen the Wen Mac/Testors version I would have realized I didn't need the flexible skirt and the project may have survived.
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Re: Testors/McCoy .049 smoked...

Post  roddie on Tue Oct 03, 2017 8:57 am

Oldenginerod wrote:I actually started to build a hovercraft when I was in high school. Pretty sure I got the idea from a Popular Mechanics article and was made of balsa with a vertical cardboard tube to mount my Cox P-40 engine in, not realizing at the time that the tank wouldn't work in a vertical situation.  I recalled the plans called for a realistic flexible skirt, which is what stopped the project in its tracks.  I just couldn't figure out a way to do it, so the project languished until I gave up and binned the part-built model.  If only I'd seen the Wen Mac/Testors version I would have realized I didn't need the flexible skirt and the project may have survived.

I think that you should "revisit" the idea Rod! I'd done some on and off thinking on a design. A Cox .049 reed-valve engine with a "Sure-Start" (horseshoe backplate) would remedy the fuel-tank issue. A tank could be mounted above on the deck with fuel-line routed down through the shroud and zip-tied to one of the engine-support rods. Starting the engine would need to be done from underneath.. so a small stand would be handy to place the model on. The glow-clip connection and needle access would be easily accessible from the top.

Directional control could be accomplished through the placement of small adjustable air-vents (holes) in the sides of the skirt. Assuming the craft has a front and rear; opening a "rear" vent would induce forward-motion.. and possibly "side-vents" for sweeping circular paths. Venting diagonal-corners only.. would induce a rotation. It certainly would be fun to play around with controlling the model. Thin plastic sheet could be used for the skirt(s).. and vents could be closed-off as simply as applying a strip of tape over them. Maybe notches cut-into the bottom of the skirt would work better? They could be taped-closed to control direction in the same way.
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Re: Testors/McCoy .049 smoked...

Post  roddie on Wed Oct 11, 2017 7:30 pm

Rebuilt and hopefully ready for a bench-run..




The replacement crank is not counter-weighted like the one that came out.. but seems to fit fine otherwise. Bob Vining (rsv1cox) supplied the donor-engine. I also swapped its' piston and cylinder into this engine.



Thanks again Bob! Thumbs Up

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Re: Testors/McCoy .049 smoked...

Post  Marleysky on Wed Oct 11, 2017 7:57 pm

SWEET! I've always liked the McCoys with the red head glow head! Glad to see you've got it back together.
"Ok, Honey, I'm going to make another movie for the guys on CEF" lol!
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