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Info on Cox engines with pulleys/gears?

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Info on Cox engines with pulleys/gears?

Post  PlaidHatter on Tue Jul 21, 2015 3:41 am

I'm trying to know where I can find some info on 049 engines that are powering pulleys or gears or belt driven accessories. If possible, I'd like to spec some info on what kind of resistance or load they can safely handle, or if upgrading the crankshaft or other parts will make them more resilient to such work.
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Re: Info on Cox engines with pulleys/gears?

Post  PlaidHatter on Tue Jul 21, 2015 3:45 am



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Re: Info on Cox engines with pulleys/gears?

Post  AUjack2003 on Tue Jul 21, 2015 3:47 am

I've seen 0.49's like that before but you might just have to get lucky and find someone local that has done those kids of modidfications to find exact figures
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Re: Info on Cox engines with pulleys/gears?

Post  PlaidHatter on Tue Jul 21, 2015 3:56 am

Well I'm thinking if these things can handle large props then if I get the gearing right I should be able to get it to run a very light insignificant accessory that's supported with some sealed ball bearings.
I miss having a lathe to play with, it would come in very handy right about now. I don't suppose I could get a Cox engine to power a lathe for me could I? Hahahahahaha, no I didn't think so.
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Re: Info on Cox engines with pulleys/gears?

Post  AUjack2003 on Tue Jul 21, 2015 4:02 am

if you have low gearing you could have quite a a large prop just find a gear with the same weight of a nomal prop and then have a belt attached to another gear then it may just work. You could also just trial and error your way to an answer


Last edited by AUjack2003 on Tue Jul 21, 2015 5:19 am; edited 1 time in total
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Re: Info on Cox engines with pulleys/gears?

Post  Admin on Tue Jul 21, 2015 4:04 am

Just for reference, the engines in the top picture and middle picture are OK Cubs.

I believe someone on here had the HP and I think torque figures too for a Sure Start or Babe Bee, I'll have to see if I can find them.

I believe the strongest crankshaft you can get for a .049 bee style engine is the Davis Diesel "Killer Crank". http://www.ebay.com/itm/COX-Eng-049-Heavy-Duty-Killer-Crankshaft-for-more-power-/23115480741

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Re: Info on Cox engines with pulleys/gears?

Post  Admin on Tue Jul 21, 2015 4:18 am

According to Aeromodeller May-1961, Max output power was recorded around 0.0625 BHP (~47 watts) @ 14,000 rpm on 15% nitro for a Golden Bee

http://www.sceptreflight.net/Model%20Engine%20Tests/Cox%20Babe%20Bee%20&%20Golden%20Bee.html

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Re: Info on Cox engines with pulleys/gears?

Post  AUjack2003 on Tue Jul 21, 2015 4:53 am

Thanks for the figures Jacob

Jack Very Happy
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Re: Info on Cox engines with pulleys/gears?

Post  Oldenginerod on Tue Jul 21, 2015 6:42 am

PlaidHatter wrote:Well I'm thinking if these things can handle large props then if I get the gearing right I should be able to get it to run a very light insignificant accessory that's supported with some sealed ball bearings.
I miss having a lathe to play with, it would come in very handy right about now. I don't suppose I could get a Cox engine to power a lathe for me could I? Hahahahahaha, no I didn't think so.

All I ask is that you don't decide to make a Cox powered generator affraid It has been tried, sucessfully by one appreciated member of this Forum, but from another we received several months of page after page of, well, I don't know how to describe it.Huh... Just don't write a thesis on it, please!!
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Re: Info on Cox engines with pulleys/gears?

Post  getback on Tue Jul 21, 2015 8:17 am

Oldenginerod wrote:
PlaidHatter wrote:Well I'm thinking if these things can handle large props then if I get the gearing right I should be able to get it to run a very light insignificant accessory that's supported with some sealed ball bearings.
I miss having a lathe to play with, it would come in very handy right about now. I don't suppose I could get a Cox engine to power a lathe for me could I? Hahahahahaha, no I didn't think so.

All I ask is that you don't decide to make a Cox powered generator affraid It has been tried, sucessfully by one appreciated member of this Forum, but from another we received several months of page after page of, well, I don't know how to describe it.Huh... Just don't write a thesis on it, please!!
I will second that Rod , I just couldn't take it after the first 2 Weeks Rolling Eyes
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Re: Info on Cox engines with pulleys/gears?

Post  TopBannana on Tue Jul 21, 2015 8:29 am

Oldenginerod wrote:
PlaidHatter wrote:Well I'm thinking if these things can handle large props then if I get the gearing right I should be able to get it to run a very light insignificant accessory that's supported with some sealed ball bearings.
I miss having a lathe to play with, it would come in very handy right about now. I don't suppose I could get a Cox engine to power a lathe for me could I? Hahahahahaha, no I didn't think so.

All I ask is that you don't decide to make a Cox powered generator affraid It has been tried, sucessfully by one appreciated member of this Forum, but from another we received several months of page after page of, well, I don't know how to describe it.Huh... Just don't write a thesis on it, please!!

That was a disaster but it was a cool project
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Re: Info on Cox engines with pulleys/gears?

Post  robot797 on Tue Jul 21, 2015 1:03 pm

I heard talk about generators here
So I thought let's drop by
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Re: Info on Cox engines with pulleys/gears?

Post  Jason_WI on Tue Jul 21, 2015 1:15 pm

The Cox GTP Nissan, Stocker, Indy, and Gasser 1/12 scale cars used pinion on a clutch bell and spur gear to go pretty fast on pavement. My GTP Nissan would go 25 to 30 MPH.
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Re: Info on Cox engines with pulleys/gears?

Post  TopBannana on Tue Jul 21, 2015 1:31 pm

Jason_WI wrote:The Cox GTP Nissan, Stocker, Indy, and Gasser 1/12 scale cars used pinion on a clutch bell and spur gear to go pretty fast on pavement. My GTP Nissan would go 25 to 30 MPH.

I have a cox eliminator 2 with gear assembly Heres some pics:

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Re: Info on Cox engines with pulleys/gears?

Post  PlaidHatter on Wed Jul 22, 2015 5:00 am

Hahaha! No worries Rod, no generator and no thesis!

AUJack, but the propeller also has drag which should be accounted for (I just recently found this the hard way, and got a talkin to about my prop being too small), a pulley will have no drag, only having to worry about it acting as a flywheel and getting the weight probably slightly heavier than a large propeller would be. The drag from the accessory would also have to be accounted for. Of course whatever accessory I decide to have this run I would try to make glide as easily as possible. I just don't know what I want this thing to do yet tho. I've seen a small steam engine display turning a Ferris wheel or merry go round. That was ok, but pretty cheesy. Lol.

Banana, ok see now that's a decent load on the Cox internals. I would love to see that run and see what that kind of ratio translates to. I'd imaging hitting a bump or something and causing the drive wheel to suddenly lose traction and then regain traction must be stressing to the crankshaft, what kind of crank are you running in that engine?
I'd also imagin this type of load would decrease the engines top RPM which would also put it into a less risky zone, so that could be an advantage.
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Re: Info on Cox engines with pulleys/gears?

Post  PlaidHatter on Wed Jul 22, 2015 5:10 am

Admin wrote:Just for reference, the engines in the top picture and middle picture are OK Cubs.

I believe someone on here had the HP and I think torque figures too for a Sure Start or Babe Bee, I'll have to see if I can find them.

I believe the strongest crankshaft you can get for a .049 bee style engine is the Davis Diesel "Killer Crank". http://www.ebay.com/itm/COX-Eng-049-Heavy-Duty-Killer-Crankshaft-for-more-power-/23115480741

I just happen to come across the "Killer Crank" last night and compared it to the Killer Bee crank. The Killer Crank seems to have a much wider bearing surface when compared to the Killer Bee crank. This could be really good for long term wear on such other uses, and might seem easier to polish as well.
I'm using my Golden Bee to set up and test a billet aluminum "running station" in which when it's done I'll surely want to assemble a "Franken Bee" with stronger internals and a bit more power to run on it. But first I need to decide what I want it to do, or what kind of 'accessory' I want it to run. I've been looking at a lot of beautiful steam engine displays as inspiration, but they tend to do some pretty cheesy things. Lol.
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