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Speed,Combat,Scale,Racing => Speed Talk => Topic started by: Dave Rigotti on March 19, 2021, 12:04:29 PM

Title: Perky Speed with FOX .15 Schnurle engine
Post by: Dave Rigotti 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!

Title: Re: Perky Speed with FOX .15 Schnurle engine
Post by: Paul Smith 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?

Title: Re: Perky Speed with FOX .15 Schnurle engine
Post by: Dave Rigotti 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.

Title: Re: Perky Speed with FOX .15 Schnurle engine
Post by: Paul Smith 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.

Title: Re: Perky Speed with FOX .15 Schnurle engine
Post by: Dave Rigotti 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

Title: Re: Perky Speed with FOX .15 Schnurle engine
Post by: C.T. Schaefer on March 20, 2021, 04:49:41 AM

The APC  6.5x5 is also a good prop to play with.

Title: Re: Perky Speed with FOX .15 Schnurle engine
Post by: Paul Smith on March 20, 2021, 06:23:44 PM

Quote from: Dave Rigotti 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

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