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Old Jul 02, 2009, 06:09 AM
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Question
Super Cub Prop Help

Hi,
I ordered a Super Cub prop over the internet and received it this morning. What I got was PKZ1005 which is 10x8, however the prop that came with the plane is a 9x6

Is this a problem?

Also I purchased GWS 10x6 props which someone recommend on the internet, but it does not fit. Any suggestions here.

It is a great day today, so looking to get flying this afternoon. So a quick response would be much appreciated.

Thanks
A.
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Old Jul 02, 2009, 06:11 AM
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smith mt. lake VA.
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Your flying a stock plane w/ stock power ?
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Old Jul 02, 2009, 06:17 AM
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Info here... http://www.rcgroups.com/forums/searc...rchid=20193744
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Old Jul 02, 2009, 06:29 AM
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Yes. Stock Super Cub LP (Lipo).

Looking through the thread now.
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Old Jul 02, 2009, 10:04 AM
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You'll love it ,wise choice
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Old Jul 02, 2009, 01:13 PM
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Yes, you need to use the 9x6 prop. The 10x8 is too much prop for that system
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Old Jul 02, 2009, 04:06 PM
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what is the issue with using too much prop... what is the downfall? Will it fry the plane?
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Old Jul 02, 2009, 06:36 PM
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Quote:
Originally Posted by gusmac
what is the issue with using too much prop... what is the downfall? Will it fry the plane?
Hi gus,

Once we hook up a battery to a motor, there is only one thing that determines how much current we pull, and that is the prop. A small prop will pull less current than a larger prop.

Every motor has a limit as to how much current we are allowed to pull through it, before it burns up.

So, in other words, if we use too large of a prop, it will cause the motor to exceed it's current limit, and destroy the motor, and possibly the ESC, and maybe even the battery itself.

There have been lots of guys whom have experimented with the Super Cub motor on 3s Li-Pos, and the best prop you can use, which will give you great performance, while keeping the motor under it's current limit... is the GWS 10x6 DD Direct Drive prop.

Chuck
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Old Jul 02, 2009, 06:42 PM
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More prop = more load on the motor = more current = more heat.

Essentially you have the opportunity to turn your airplane into an expensive fireworks display.
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Old Jul 07, 2009, 09:31 AM
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Quote:
Originally Posted by gusmac
what is the issue with using too much prop... what is the downfall? Will it fry the plane?
In addition to overheating the controller, rotational torque will be greater making the plane somewhat harder to control.
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Old Jul 07, 2009, 10:47 AM
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The OLD stock Cub is brushed and NiMh. It pulls ~10A.
Put a 3S in there and it pulls ~18-20A,
PZ publishes NO GUIDANCE or SPECS on the RX/ESC in the Cub.
Collective experience/wisdom seems to have centered on using a GWS 10x6HD or APCe 10x5. That pulls ~12-13A.

LOTS of folks go 3S and keep the stock prop. Some get away with it, some burn up the RX/ESC. The motor does wear faster but it's cheap.

The NEW LP Cub appears to be stock with a 3S.
Yesterday I asked Horizon support specifically if the RX/ESC had been redesigned for the new Cub. The 10x8 IS listed as a 'hop up' part and suggested for floats. Support said the part was redesigned and that was "allowed". He had no specs as usual for the part.

It should work, but realistically you are in unknown territory and on your own.
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