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Tune pipe and prop size for kougar

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Tune pipe and prop size for kougar

Old 09-25-2009, 03:27 PM
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Default Tune pipe and prop size for kougar

Just bought Macs tune pipe for the Kougar. It will be on a OS 46 AX. What do you think the best prop would be. It has an 11x7 on it now. I heard that if you use this size prop that the header does not need to be cut.
Old 09-25-2009, 04:19 PM
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Default RE: Tune pipe and prop size for kougar

I would try the 10x6 or 9x8. 11" diameter is too big. You want the motor in the 15-16k range on the ground. I know the 10x6 will get there.

On our unpiped T-34s we run a 10x5 or 9.5x6 at ~16.8k on the ground. Believe it or not they run pretty well at those RPMs. With a piped AX you need to load it so that it just reaches 17k in the air.
Old 09-25-2009, 04:41 PM
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Default RE: Tune pipe and prop size for kougar

I use a 9x7 on my .46 fx and it works very well.[8D]
Old 09-25-2009, 06:27 PM
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Default RE: Tune pipe and prop size for kougar

why would anyone trying to make cougar go faster with a 11x7 on a 46 size engine,is beyond me, 16k on a 10x6 prop with a mac's pipe is gonna make it move , cutting the header isnt any big deal, i am sure some here has a os 46 running a pipe, but no one is running a 11x7, i am running 4" header length on a 46 os , but i am spinning a 10x8 at 14 plus on a much lighter airframe
Old 09-25-2009, 11:43 PM
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Default RE: Tune pipe and prop size for kougar

ORIGINAL: ChrisAttebery

On our unpiped T-34s we run a 10x5 or 9.5x6 at ~16.8k on the ground. Believe it or not they run pretty well at those RPMs. With a piped AX you need to load it so that it just reaches 17k in the air.
Chris , what about the bearings on the AX at those RPM , do they last ????
Old 09-26-2009, 10:39 AM
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Default RE: Tune pipe and prop size for kougar

First set lasted over a season of racing. I just changed them at the end of the season out of habit. I haven't heard of anyone losing a bearing or rod at these rpms. Matter of fact, most of the engines in our series have been through a crash or two and they still run strong.
Old 09-28-2009, 11:56 PM
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Default RE: Tune pipe and prop size for kougar

OK , good to know it , just as a reference how many racings complete a season there ???

Old 09-29-2009, 09:08 AM
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Default RE: Tune pipe and prop size for kougar

I practiced a couple times a week plus raced 4 races. I'd say the motor had 120+ flights on it.
Old 09-29-2009, 11:30 AM
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Default RE: Tune pipe and prop size for kougar

Thank you Chris .

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