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Old 07-15-2009, 06:21 PM   #1
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Pusher engine, extra cooling

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I have acquired an A/C that requires a .40 to .50 pusher engine. I have been looking for those clamp on heat sinks that are used in helicopters and boats. Does anyone know where I can get them. I do not want to plane the head off and attach an electronic heat sink cause some of my engines are hard to find parts for. I have seen them advertised but I know not where.
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Old 07-15-2009, 09:28 PM   #2
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Re: Pusher engine, extra cooling

Unless you have the engine heavily cowled in, it should get enough airflow from the prop to keep cool.
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Old 07-16-2009, 10:26 AM   #3
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Re: Pusher engine, extra cooling

With pusher installations, airflow during flight would provide you with adequate cooling if you designed the system correctly.

It was prolonged idling on the ground, with the obvious lack of cooling flow, that created most of the problems.

I would think that in this case a heli cooling jacket would be an uneccesary penalty in weight as in the original installation they were supplied with a motor mounted fan. Just avoid any prolonged high powered runs on the ground or, if the motor is totally enclosed, try and design the cowling so the outlets sit within 1 chord width or less of the prop and far enough out the blade that it will create the airflow you need.
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Old 07-16-2009, 10:31 AM   #4
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Re: Pusher engine, extra cooling

Annother trick for keeping cool is to mount a standard tractor prop (of the same diameter and pitch) for the first start up and carb set, then when it is running good and set to fly, switch back to the pusher.
I had a OS .46 on the back of my CT114 snowbird, and this worked well to keep the engine from over heating during run up and carb/pump adjustments

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