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"Cox Special MKII .15"



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Radial 5 Cylinder (5 x .5cc)

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Radial 5 Cylinder (5 x .5cc)

Post  ian1954 on Sun May 25, 2014 4:27 pm

This is a 2.5 ccm 5 cylinder radial glow manufactured in 1986.

The 3 piece crank case was machined from bar stock and is mounted with a rear mounting ring.

The crank shaft is in one piece. The engine has a rear pressure pump.




Bore 9.0 mm
Stroke 8.0 mm
Rpm 10,500 rpm
Total combustion 5x0.5 ccm
Weight 175 gram
Intake Rear Rotary Pump
R/C Carburetor
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Re: Radial 5 Cylinder (5 x .5cc)

Post  PlaidHatter on Wed Jul 22, 2015 3:50 am

Oh my! This is absolutely gorgeous!
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Engine website

Post  Oldenginerod on Wed Jul 22, 2015 4:08 am

Hatter.
Have a really long study of this site. http://www.modelenginenews.org/ There's some amazing engines out there. Unfortunately the fellow (Ron) who operated the site passed away last year, so it is now stuck in time.
On the left side you will see "Engines" in the menu. Some real eye candy there. Thumbs Up

Rod.
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Re: Radial 5 Cylinder (5 x .5cc)

Post  PlaidHatter on Wed Jul 22, 2015 4:45 am

Thanks for the link, I indeed found myself getting very happily lost, very quickly. I'll have to set aside some good relaxing time to go through that site! Thumbs Up
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Re: Radial 5 Cylinder (5 x .5cc)

Post  getback on Wed Jul 22, 2015 8:50 am

Yes Ian has some Very nice engines SSSS and shares with us quite often , wonder what kind of smell , noise , mess he is making lately ??? Small Cox Logo Eric
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Re: Radial 5 Cylinder (5 x .5cc)

Post  Balsa to Foam on Thu Jul 30, 2015 3:11 pm

are those glow heads instead of glow plugs Huh...
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Re: Radial 5 Cylinder (5 x .5cc)

Post  Jason_WI on Thu Jul 30, 2015 9:04 pm

That must use a roots blower to generate pressure.
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Re: Radial 5 Cylinder (5 x .5cc)

Post  larrys4227 on Thu Jul 30, 2015 9:19 pm

That engine is insane .... Shocked Shocked
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Re: Radial 5 Cylinder (5 x .5cc)

Post  ian1954 on Sun Dec 13, 2015 6:17 pm

Balsa to Foam wrote:are those glow heads instead of glow plugs Huh...

They are glow plugs. Cox 010 turned down.
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Re: Radial 5 Cylinder (5 x .5cc)

Post  Peter2000 on Wed Dec 23, 2015 11:47 am

ian1954 wrote:
Balsa to Foam wrote:are those glow heads instead of glow plugs Huh...

They are glow plugs. Cox 010 turned down.

hmm... how do you fire up this babe? Clip on Starter clips on all glow plugs?
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Re: Radial 5 Cylinder (5 x .5cc)

Post  ian1954 on Wed Dec 23, 2015 2:54 pm

It has only been fired up once by me (just to see if I could!).

All plugs have to be connected - I wired them in parallel to an old 1.5v lead acid accumulator - it took me a while to get it firing on all cylinders but that was due to me being cautious.

Radial model engines require care- it is easy to flood the bottom cylinders which could lead to nasty consequences.

Eventually I had it firing on all cylinders but left it rich as it needed running in. I also used synthetic oil as I didn't want to gum it up and spend hours cleaning it or dismantling. Just a flush and drain followed by a light oil.

This engine tightened as it warmed up. Anyone intending to run it seriously would have to take care running it in.

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Re: Radial 5 Cylinder (5 x .5cc)

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