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Cox Engine of The Month
September-2019
Levent Suberk's

CEF Magazine cover featuring the Ex Model Engines Harpy Eagle .049



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What is this engine?

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Help! What is this engine?

Post  Not a cox guru on Mon Sep 09, 2019 1:56 am

Hi everyone, I have this .049, but I have no idea what model it is, does anybody have an idea of what model it is?

https://paste.pics/fcd92d1bcc058ea907d92a4e3083de0b

What is this engine? Fcd92d1bcc058ea907d92a4e3083de0b


Last edited by Admin on Mon Sep 09, 2019 3:18 am; edited 1 time in total (Reason for editing : fixed picture)
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Help! Re: What is this engine?

Post  Not a cox guru on Mon Sep 09, 2019 1:58 am

BTW I haven't figured out how to post pics properly so just right click on the link and then press "open image in new tab"
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Help! Re: What is this engine?

Post  dirk gently on Mon Sep 09, 2019 3:34 am

Looks like a Ranger to me, which is basically a die cast SureStart with an intake throttle.
Not sure about the black crankcase though.
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Help! Re: What is this engine?

Post  Not a cox guru on Mon Sep 09, 2019 4:14 am

Yeah that is what I thought, maybe its a black bomber and the previous owner put an RC carb on it like this one:https://coxengines.ca/throttle-conversion-for-cox-049-engine-tanked.html
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Help! Re: What is this engine?

Post  Levent Suberk on Mon Sep 09, 2019 5:19 am

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Help! Re: What is this engine?

Post  Not a cox guru on Mon Sep 09, 2019 5:24 am

Is the black bomber powerful?
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Help! Re: What is this engine?

Post  Oldenginerod on Mon Sep 09, 2019 5:25 am

Who would know?  It may not be "officially" called anything.  There are so many different parts that have been available in recent years, it hasn't been difficult to build your own unique engine.
It's possible that a Ranger was customised with a black crankcase or a Black Bomber was customised with a throttle.  The documentation shown isn't specific for this engine.

Rod.

(On another note, I struggle a little with this type of engine being known as a "Ranger".  A Ranger was an actual original Cox product, as pictured.)
What is this engine? Screen16
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Help! Re: What is this engine?

Post  Not a cox guru on Mon Sep 09, 2019 5:39 am

If it was a customized engine, can anybody guess approx power output, or is that to hard? It has a rather large prop on it for an .049 so I am assuming the old owner was pretty confident in the crankshaft. I don't have the guts to take it apart, so would it be safe to run it with such a large prop?
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Help! Re: What is this engine?

Post  Surfer_kris on Mon Sep 09, 2019 5:41 am

It looks like a die cast crankcase with a sure-start cylinder and backplate....

Max prop would be around 6x3.
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Help! Re: What is this engine?

Post  fredvon4 on Mon Sep 09, 2019 11:33 am

Bernie still sale a $54 Throttled Die cast "Ranger"....raw crankcase but same as shown by OP

https://coxengines.ca/cox-.049-rc-ranger-engine.html

Matt or Bernie or both used to have die cast crank cases in several colors...now all I see is pink die cast from CoxInternational

If I was a betting man....the engine shown was bought off ebay from Bernie a few years back when they had a large variety of configurations

without knowing the cylinder porting we have to assume average reed valve .049 performance....prop shown does not appear over large to me


here are the two best sources for Cox engines and parts

http://www.exmodelengines.com/home.php

https://coxengines.ca/
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Help! Re: What is this engine?

Post  Not a cox guru on Mon Sep 09, 2019 1:56 pm

Ok, thanks for all the help!
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Help! not a guru

Post  fredvon4 on Mon Sep 09, 2019 3:04 pm

none of us are ....some more than others

you are in right forum

intro....scroll down the topics

let us know YOU
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Help! Re: What is this engine?

Post  dirk gently on Tue Sep 10, 2019 7:28 am

Not a cox guru wrote:If it was a customized engine, can anybody guess approx power output
I'm guessing about 50-60W or around 0.075hp on a 6x3 prop.


I don't have the guts to take it apart, so would it be safe to run it with such a large prop?
You don't have to take the entire engine apart just to change the prop, or did I misunderstand you?
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Help! Re: What is this engine?

Post  Not a cox guru on Tue Sep 10, 2019 1:49 pm

No you did not misunderstand me, 50-60w that's more than I thought! I am going to build a Slipso plane for this one RC Plane
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Help! Re: What is this engine?

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