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Cox Engine of The Month
February-2024
1/2A Nut's

"RC Speed Boat Power Drive TD .020"

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Post  Kevoin Mon Apr 23, 2018 9:37 pm

Does anyone know what size motor this is Thanks allMystery motor Screen10
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Post  Jason_WI Mon Apr 23, 2018 9:47 pm

Welcome to the forum.

Well the caption to the picture states it’s a ED Mk2 penny slot diesel.

http://soaring-sailing.blogspot.com/2013/04/ed-mkii-penny-slot-diesel-motor.html?m=1
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Post  Oldenginerod Tue Apr 24, 2018 4:23 am

So that would make it a 2cc.
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Post  GallopingGhostler Tue Apr 24, 2018 5:49 am

Sceptre Flight has two articles on its latest version that came out a year later, renamed Competition Special. Jason_WI's article has a link that goes into the history of the engine.

Sceptre Flight: ED Competition Special (2nd article)

Later version did away with the exhaust stack, 0.122 C.I., 6 oz. weight, added SPI with increase to 0.109 HP at 7,000 RPM, swung an 11" prop, was used to power free flight aircraft in the 4' wingspan range -

Sceptre Flight: ED Comp Special

Apparently the less powerful ED Penny Slot Mk-II was very popular in 1947.

modelenginenews.org wrote:Regardless of who was responsible, the original E.D. 2cc design was quickly transmuted with relatively minor changes into the initial version of the famous E.D. Mk II "Penny slot model" (as it soon came to be colloquially known). The E.D. Mk II made its market appearance by that name in February 1947 and was energetically promoted and further developed from that point onwards.
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Post  Oldenginerod Tue Apr 24, 2018 5:55 am

I'd heard of the "Penny slot" engine before and assumed that it referred to the exhaust stack looking like the slot on a slot machine. It actually referrs to the unusual compression screw which is designed to use a coin to adjust it, not a tommy bar like most diesels use.
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Post  NEW222 Tue Apr 24, 2018 6:43 am

It took me a second look at the top of the head then realized too that it referred to the compression screw. Neat idea.
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Post  Kevoin Tue Apr 24, 2018 7:48 am

Thanks all Very Happy
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Post  Surfer_kris Tue Apr 24, 2018 9:42 am

Neat idea, but where would one actually find a coin these days...? lol!

Does it not take credit cards or swish?
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Post  Oldenginerod Tue Apr 24, 2018 5:57 pm

Surfer_kris wrote:Neat idea, but where would one actually find a coin these days...? lol!

Does it not take credit cards or swish?
A credit card would not be strong enough lol!

Seriously, while it might seem a cool idea, can you imagine fumbling around with a penny coated in castor oil trying to adjust the compression? Huh...
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