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Cox Engines Forum  :: Engines :: Cox Engines

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Post  John Goddard Thu Jan 05, 2012 6:45 am

Appologies in advance guys but............
The ebayed left handed starter springs, are they to
fire the engine up to run clockwise?
Or are they the 'correct' direction?

confused
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Post  microflitedude Thu Jan 05, 2012 7:19 am

They are coiled in the opposite direction, so yes, they run the engine clockwise. You can use them on pushers, or with a lefthand prop.
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Post  John Goddard Thu Jan 05, 2012 7:26 am

Nice One Dude
Mille Grazzi
Very Happy
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Post  SuperDave Thu Jan 05, 2012 10:21 am

Additionally, on twin engine applications counter-rotating props help overcome the effect of engine torque.
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Post  nitroairplane Thu Jan 05, 2012 10:22 am

If running a pusher engine it is recommended you use a brass drive plate.
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Post  Cox International Thu Jan 05, 2012 11:24 am

Left hand springs actually start the engine counter-clockwise (non-conventinal). Rotation is measured from the pilot's seat and not when standing in front of the aircraft Smile
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Post  microflitedude Thu Jan 05, 2012 11:37 am

Cox International wrote:Left hand springs actually start the engine counter-clockwise (non-conventinal). Rotation is measured from the pilot's seat and not when standing in front of the aircraft Smile

Never thought about it that way, I bet it causes a lot of confusion! Very Happy
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Post  Cox International Thu Jan 05, 2012 11:40 am

Yep, we get the question almost every day Rolling Eyes
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Post  nitroairplane Thu Jan 05, 2012 12:34 pm

Maybe call it a spring start for pushers?
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Post  Cox International Thu Jan 05, 2012 12:58 pm

That is technically incorrect as pusher engines still turn in the same direction (clockwise) as tractor engines (pulling forward) except that the prop pitch and thrust is reversed.

The LH spring is meant to be used with LH props such as this one:

http://coxengines.ca/product.php?productid=83&cat=9&page=1

whereas the engine still runs as tractor but the prop turns counter-clockwise.
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Post  nitroairplane Thu Jan 05, 2012 1:04 pm

Never thought of it like that.
My bad Smile
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Post  microflitedude Thu Jan 05, 2012 2:08 pm

Then I have been running my engines wrong...

I use a left hand starter spring, flip the prop over backwards for more thrust, and run it backwards. Very Happy Brass plate, of course.
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Post  Cox International Thu Jan 05, 2012 2:13 pm

You can only do this effectively with a prop that was designed for LH use such as the 3-blade LH ones we sell.

Flipping a RH prop like this will work somewhat but not well due to the dynamics of the inherent leading and trailing edges.
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Post  nitroairplane Thu Jan 05, 2012 2:19 pm

Funny story:
I have a cox 5x4 prop that will only usually run backwards.
It took me ages to realise until one dy with a diesel pee wee I righted the prop screw then started up the engine and got a face full of diesel lol!
Seriously.
Surestart ran backwards
Pee wee ran backward
Pee wee diesel ran backwards
Tee dee .020 diesel even ran backwards a bit.
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Post  Cox International Thu Jan 05, 2012 2:20 pm

Actually, let me re-phrase this as I did not read your post correctly.

What I was trying to say is that every prop has blades that have leading and trailing edges and are meant to rotate in a specific direction only and this rotation cannot be reversed with the expectancy of like performance.

However, if one maintains the designeated rotation, they wil work just the same and provide pusher instead of tractor performance; and vice-versa
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Post  Cox International Thu Jan 05, 2012 2:21 pm

And yes, all Cox reed valve engines run equally well in both directions.
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Post  nitroairplane Thu Jan 05, 2012 2:25 pm

That is an advantage Reed valves have ove FRV and RRV
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Post  crankbndr Thu Jan 05, 2012 3:03 pm

Seems like left rotation on a single engine control line model would help keep the lines tight.
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Post  nitroairplane Thu Jan 05, 2012 3:05 pm

Be worth a try!
You could try it with one of your little stinkers.
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Post  crankbndr Thu Jan 05, 2012 3:07 pm

Need a left prop.
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Post  nitroairplane Thu Jan 05, 2012 3:11 pm

Can always carve one Smile
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Post  nitroairplane Thu Jan 05, 2012 3:12 pm

wooooo 4000 posts!

Happy New Year Fireworks Fireworks Fireworks Fireworks
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Post  mr_cox Thu Jan 05, 2012 3:21 pm

Congratulations Indra! Beer Cheers

If an engine ran his entire life the 'normal' direction. Is it still capable to run backwarts?

I think parts are all worn in one direction, maybe the other way there will be more friction?

Got some of the #334 LH starters to, they have a black ring.
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Post  Cribbs74 Thu Jan 05, 2012 3:22 pm

John Goddard wrote:Appologies in advance guys but............
The ebayed left handed starter springs, are they to
fire the engine up to run clockwise?
Or are they the 'correct' direction?

confused

Guess it wasn't so stupid, looks like a few of us learned something, myself included.
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Post  nitroairplane Thu Jan 05, 2012 3:23 pm

mr_cox wrote:Congratulations Indra! Beer Cheers

If an engine ran his entire life the 'normal' direction. Is it still capable to run backwarts?

I think parts are all worn in one direction, maybe the other way there will be more friction?

Got some of the #334 LH starters to, they have a black ring.

Yeah it would.
The drive plate and crankcase wear out on one side.
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