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Author Topic: F P 10 prop size  (Read 1084 times)

Offline Bootlegger

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F P 10 prop size
« on: February 28, 2015, 08:59:19 AM »

 What is a good size prop for an F P 10 for stunt? I have a Jr Flight Streak that I am going to use this engine on and would like some prop suggestions.
 Thanks
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Offline John Fitzgerald

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Re: F P 10 prop size
« Reply #1 on: February 28, 2015, 11:01:10 AM »
We always used 8x4 APC on the FP 10 on the Akromaster, with good results on .012 x 50 ft lines.

Online Brett Buck

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Re: F P 10 prop size
« Reply #2 on: February 28, 2015, 11:11:30 AM »
Well let's see. On an .099 I used a 7 x 4 so on a more powerful OS .10 I'd try a 8 x 4 or a 7 x 5 for a start. I'm not sure it can handle a 9 x 4, but you never know. Anyhow, experiment with those I mentioned. Others will come on with their input.

  I have no specific knowledge at all, but I anticipate that you will have a problem finding a prop that provides the right combination of RPM and in-flight speed. I expect the issue will be that you need 7" to get decent rpm, but 4" of pitch will be way too much. If you can find a sufficiently robust 7-3, that's where I would start.

   You can also use reduced diameter to decrease the efficiency. I think you will find 8", and possibly 7", too efficient. I am sure you could start it on a 10-6, but the big mistake people tend to make on modern engines of all types is trying to run too much diameter. That went out in the 4-2 break/ST46 era. You need to rev up to to make the engine happy, and that will more than make up for lost efficiency. IT must be extremely inefficient in level flight or even a .10 will pull the airplane far too quickly if it hooks up all the power it is capable of. The alternative is to detune it to remove some of the power, which is what the Head Gasket Patrol and guys with Dremel tools attempt.

    This is true even at the highest levels. Dave and I are running *much* smaller props than the engines will safely manage. I made the flyoff for the first time and finished 3rd in 2000 running what was previously David's "break-in prop", after having buzzed it down a few times. It wound up at 11.25" - on a PA61 capable of the spinning same prop at 13.5-14".  Same with year I won, I buzzed the prop on Top 5 day, didn't even clean the end up, and it was down to about 11.75 - from 12.5.

    Brett

Offline Akihiro Danjo

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Re: F P 10 prop size
« Reply #3 on: February 28, 2015, 11:48:28 AM »
I have two FP10 powered stunt models.
I use APC 7-4, Kyosho 7-4, Yoshioka or Thunder Tiger 7-4.5.
I fly both models with about 14 meters (e-e) .012" wire and 50cc tank to do FAI pattern.
Stock venturi, but with an enlarged exhaust muffler and 4.0mm NVA (Enya or MVVS) that is thicker than stock OS NVA. OS stock NVA is OK with OS stock muffler.

Aki
« Last Edit: February 28, 2015, 07:23:33 PM by Akihiro Danjo »

Offline Bill Little

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Re: F P 10 prop size
« Reply #4 on: February 28, 2015, 02:13:48 PM »
I would try an 8-4 cut down to 7.5-4.

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Offline dennis lipsett

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Re: F P 10 prop size
« Reply #5 on: February 28, 2015, 02:34:22 PM »
I have about 9 OS10 engines set up for c/l and have always used an APC 7/4 or a TT 7/4.5 prop. They are capable of flying on 55 foot lines. I use the stock venturi and nva that OS provided with the engine.
Regrettably it's been some time since I've flown anything small recently.

Dennis

Offline wwwarbird

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Re: F P 10 prop size
« Reply #6 on: February 28, 2015, 05:45:15 PM »
I have about 9 OS10 engines set up for c/l and have always used an APC 7/4 or a TT 7/4.5 prop. They are capable of flying on 55 foot lines. I use the stock venturi and nva that OS provided with the engine.
Regrettably it's been some time since I've flown anything small recently.

Dennis

 Interesting, got any photos of those models you can show us Dennis? I've got two NIB OS.10's with Jim Lee venturis sitting on my shelf, I've often wondered what I might them on. D>K
Narrowly averting disaster since 1964! 

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Offline Bootlegger

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Re: F P 10 prop size
« Reply #7 on: March 06, 2015, 10:19:53 AM »

  Thanks fellows...
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Offline James C. Johnson

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Re: F P 10 prop size
« Reply #8 on: March 06, 2015, 02:45:26 PM »
I flew the FSR 10 on a scratch built RC job for flying in school yards... over 500 flights, what a gem of an engine.. I used the TF white with red tip plastic 7-4 almost exclusively on this engine... 4oz of fuel ran for over 20 minutes a tank.. I would go with a 7-4 or 7-3... Jim 


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