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  • October 17, 2021, 09:30:59 PM

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Author Topic: Perky Speed with FOX .15 Schnurle engine  (Read 618 times)

Online Dave Rigotti

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Perky Speed with FOX .15 Schnurle engine
« on: March 19, 2021, 12:04:29 PM »
I'm looking for some prop recommendations for my just acquired Perky speed model powered by a FOX .15 schnurle.
I'm thinking an APC 7x6?
Anybody know or have experience that can lead to a few sizes to try?

Thanks!
Dave Rigotti
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Chesterland, Ohio

Offline Paul Smith

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Re: Perky Speed with FOX .15 Schnurle engine
« Reply #1 on: March 19, 2021, 01:19:12 PM »
The 7 x 6 is good for a safe start.

In general the typically-recommended prop for a .15 is a  7 x 6, but it under revs the engine and does not give the highest speed. 

Maybe you will scuff the prop on takeoff.  Then you can cut it down and balance it an probably go faster.   

The winning speeds in Perky are done with RPM in the 25,000+ range.  Do you know the RPM of your engine?
Paul Smith

Online Dave Rigotti

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Re: Perky Speed with FOX .15 Schnurle engine
« Reply #2 on: March 19, 2021, 02:09:40 PM »
Static RPM reads 17,200 running slightly rich on a test run.  Might go better with a bit more running.
Dave Rigotti
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Offline Paul Smith

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Re: Perky Speed with FOX .15 Schnurle engine
« Reply #3 on: March 19, 2021, 03:58:05 PM »
That sounds good enough.

Test fly it and see how it goes.  Good speed is attained with higher RPM. 
High RPM reduces engine life while putting better numbers on the scoreboard.
This is the essence of all motorsports.

Paul Smith

Online Dave Rigotti

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Re: Perky Speed with FOX .15 Schnurle engine
« Reply #4 on: March 19, 2021, 04:01:04 PM »
"Go for the win...or go home!"

I'm liking the bragging rights to the average speed hardware!

Thanks
Dave Rigotti
AMA 66859
Chesterland, Ohio

Offline C.T. Schaefer

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Re: Perky Speed with FOX .15 Schnurle engine
« Reply #5 on: March 20, 2021, 04:49:41 AM »
The APC  6.5x5 is also a good prop to play with.

Offline Paul Smith

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Re: Perky Speed with FOX .15 Schnurle engine
« Reply #6 on: March 20, 2021, 06:23:44 PM »
"Go for the win...or go home!"

I'm liking the bragging rights to the average speed hardware!

Thanks

The 2020/2021 Average is currently 103.14 with only nine scores in the book.  But we have eight months to go.  Hopefully this will be a better year.
Paul Smith


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