COX TWIN MOTOR
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- čas přidán 22. 04. 2024
- This video is about a twin cylinder model airplane motor that my dad built back in the late 1960's or early 1970's. He used plans from an article that was in the May/June 1966 issue of American Modeler Magazine.
Link to NightFlyyer / @nightflyyer
Link to NightFlyyer Twin Cox .049 cylinders equals one .098 Nitro Engine.
• Twin Cox .049 cylinder...
Here are a few more of the Cox based twin and multi cylinder engines that I found by Googleing cox twin motor. A link will be in the description.
www.google.com/search?q=cox+t...
Cox based twin and multi cylinder engine on E-BAY www.ebay.com/itm/324541412304
URL for Boston Gear www.bostongear.com/products/o...
Transcript
Link to NightFlyyer
czcams.com/channels/vPYY0HFGNha0BEY9up4xXw.html
Link to the NightFlyyer video Twin Cox .049 cylinders equals one .098 Nitro Engine.
czcams.com/video/grlD6FZ5ELM/video.html
If you want copies of the magazine article please send your email to onmyworkbench@gmail.com and I will send them to you.
Very cool, I just remember having around seven or eight .049 engines as a kid they were all over the place.
Wow. Rc before I was born is so fascinating after watching it explode in the 80's
That was way cool! I'm 77 yrs.old and did a bit of modeling when I was a kid. Always U-control. I never saw a twin cylinder engine like the one you show. It is really neat. Your dad must have been a very skilled and creative guy. I think that what he did was very impressive. I now have a collection of antique flywheel engines and belong to a club of guys like myself who enjoy tinkering with them. I built an engine from an old air compressor and it runs quite well. Hit and miss. But it cant fly!! There is a definite magic to that!
Good luck finding the 5-40 prop bolts!
Very Very COOL ! Thank you
Wow, old time skills! I doubt many people today could work metal like your Dad did without so few tools!
Thanks, he was very innovative.
When I was a kid in the late seventies the neighbor had a couple planes with different versions one was twin cox .049 engine similar to what you're showing and the other was a twin
TD .051 and if I remember he also had a little opposed twin made from cox parts and I assume he made them because he had all kinds of machinist tools in his garage cause that's where I always found him... Thanks for the blast from the past
Cool stuff. Your dad sounds like my dad. My dad also built many 5 and 7 cylinder radials using cox engines. He met Larry Renger from cox, hoping to have them manufacture his design. Turns out my dad needed to get more RPM's from his engines to make it more marketable. Two stroke radials are a whole lot harder to get to run with a shared crank
The 049 is every kids first exposure to ICE engines. Unbelievably robust and versatile engine.
A twin mod is really cool. And uber simple given the 049 runs in either direction.
That was absolutely amazing. I had no idea our daddy did all that. He was a brilliant man and so are you. I remember watching him fly at the fields and it was absolutely beautiful to see those planes takeoff, fly and land. He built some amazing airplanes.
Yes he did!
Just found your channel and subscribed. Very interesting. It’s impressive seeing what people can do with limited machines.
Thank you, How did you find my channel?
I loved those little engines. Lots of fun in cars and planes, late 70’s early 80’s.
Yes the were fun and now we all need hearing aids!!!😂
Wow!! I remember that magazine article…..I had every intention of building one of those, but couldn't source the aluminum nor the gears back then. Nice to see this blast from the past……
Now you can get the aluminum from Home Depot or Lowes and the gears are available at Boston Gear I included a link to the in the discerption, the gear are listed in the article of if you would I can send you the scans.
Dang did yall see that 4 cylinder radial in that magazine! I wanna see that!
I have a couple of 5 cylinder radials in storage, if I can find the I will do a video on them.
Great vid. Thanks for posting this.
You are welcome. How did you find it?
@onmyworkbench7000 I look at alot of odd motors, ect.
utube keeps them coming, lol
That is great. It would have been easier to build mine with 2 golden bees with tanks for sure, but my friend never saw any articles. He just did it with depon. Thanks much and I would love to have seen it run.
We had many .049s back in the 1970's. Never thought about a twin version. Certainly, would have been beyond the skill of a 10 year old like me. Really cool! Subscribed.
Thanks for the Sub, I need all of the that I can get.
@@onmyworkbench7000 Here is a link to one of my flying Subaru engine videos:
czcams.com/video/BPLVQ2733CQ/video.html
Was hoping to see it run. It was easier to use the o49 Baby bees with the tank than the one my friend built. Thanks and happy flying.
I may do a video of it running if I can find some 20 or 25% nitro glow fuel with 20% oil.
great video noticed at the end there was a 4 engine in pictures guess you could make a radial that would be intersting to start cheers from new zealand JK
Yes you could. I was in New Zealand in January of 2001 and loved it.
Back when Cox .049 engines and parts were available. By the 1990s we had trouble getting parts for our favorite TD .051 as they had simple RC throttles
I have a lot of old Cox parts but it's the glow heads that that are critical with out good glow heads the motors are useless, my dad drilled and taped the center of an old glow head for a glow plug and it worked good.
man I had a testors 049 that screamed! i like cox butbthis testors was BA!
Detroit Diesel used the principle joining two inline six’s forming an engine more compact than their V-12.
Could you please send me a copy of the Article. When I was in High School in the late 60s one of the fellows in the mold making course cast a variation of this design with the cylinder at an Agle like a twin V, I had one that I ran in a Half pint model boat until it sunk in the 70s.
I would be happy to, please send me your email address to onmyworkbench@gmail.com
He forgot to mention the Cox TeeDee .010 engine. You want Tiny, It was.
I intentionally left out the the TeeDee series of Cox engines because they use a venturi with crankshaft port timing for their fuel air induction system. In the video I was talking about the reed valve engines, as I stated in the video engines that use a venturi and crankshaft port timing will not run CW. It is my understanding that Cox tried to make a reed valve .010 but it would not run very well so they went with the venturi and crankshaft port timing.
*_NOTE: The follow is from Wikipedia. To find it Google Cox model engine._*
"In 1960 Cox hired an engineer named Bill Atwood (who had already built his own line of engines), to develop a new .010 cubic inch engine. Atwood was also responsible for the Tee Dee and Medallion line of engines. These engines put Cox on the map as a leading engine in the world for many years to come.[10]
One of the things Cox wanted Atwood to do was make him a .010 engine. Cox had already tried to halve the size of the Pee Wee .020 but couldn't get it to run for some reason. The suspicion surrounded a problem with the tiny reed valve. Atwood found that the front rotary valve worked well on the .010 size hence the .010 was born.[20]"
Now who is going to build a triple?
Google COX TWIN MOTOR and you will find some.
he machine down and mate cases?
@0:40
was that a 4 cylinder radial arrangement with a similar planetary crankshaft hack?
I looked at the scanned photo and it looks to me as if it is a geared motor like the one built from the .049's.
What leads me to believe that it that radial engines all have to have an odd number of cylinders. such as 3,5,7or 9 cylinders. I suspect that you are on the right track that it has a main gear that's attached to the crankshaft and the smaller gears are on the motors 90 degrees apart from one another.
@@onmyworkbench7000 the odd number has something to do with balance, I think, & the .049 is light enough "balance" isn't a big concern.
@@Iowa599 Below is from Wikipedia.
Four-stroke radials have an odd number of cylinders per row, so that a consistent every-other-piston firing order can be maintained, providing smooth operation. For example, on a five-cylinder engine the firing order is 1, 3, 5, 2, 4, and back to cylinder 1. Moreover, this always leaves a one-piston gap between the piston on its combustion stroke and the piston on compression. The active stroke directly helps compress the next cylinder to fire, making the motion more uniform. If an even number of cylinders were used, an equally timed firing cycle would not be feasible.
@@onmyworkbench7000 yeah, basically balance. If one will run with 2, it will run with 3, or 4, cylinders. Maybe not smoothly, but your grandma won't be riding in it.
makes me think, the piston isn't moving the fastest at 90° crank rotation, half-way up the bore. It is at 72.5° rotation, just over halfway up the bore (when going up or down.)
edit: assuming the bore is centered over the crank, but that's not always the case
COX, LOL.
Do to friction loss, I can't believe much power will be made over the single cox...
Perhaps, but it has much less vibration.
@@onmyworkbench7000 ...aaa.. still cool..
More torque.
@@patrickradcliffe3837 And more torque would let it swing a bigger prop.