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difference in prop types - 1/20/2013 2:47 AM   
jjoos99


 

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From: Yellow Springs, OH, USA
Status: offline 		not sure if this is the right forum to put this in but what is the difference between all the different types of wooden props. I have seen type a, c, d, and e. I was wanting to order a new prop for my os 70 4 stroke and wasnt sure the difference between all the props.
thanks
Jeff

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RE: difference in prop types - 1/20/2013 3:12 AM   
jeffie8696



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Status: offline 		Not all props are created equal to put it simply. In general wide bladed props work best with 4 stroke engines while narrow blades work well with screaming 2 strokes. However it seems there are no hard rules, I prefer to grab a handful of props in the general size range and fly each one then decide.


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RE: difference in prop types - 1/20/2013 5:05 AM   
airraptor


 

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Status: offline 		Try a 12x7 and 12x8 on the engine

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RE: difference in prop types - 1/20/2013 6:58 AM   
cymaz



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Status: offline 		Have you looked up the manufacturers specifications to see what is a good starting point???

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RE: difference in prop types - 1/20/2013 3:43 PM   
SrTelemaster150



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Status: offline 		Depending on the drag factor of the airframe the engine is to be used in, I prop about 700-1500 RPM less (static) than the maximum RPM of the engine.

If the engine is to be installed in a WW-I biplane start W/the smaller spec'ed props. If it's going into a P-51 Mustang, go W/the larger spec'ed props.

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RE: difference in prop types - 1/20/2013 5:05 PM   
carrellh



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Status: offline 		I like a 13x6 Master Airscrew K Series on my 70 four stroke. As already stated, try a few to see what you like.

edit
the K series is plastic, didn't read the original post very well

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RE: difference in prop types - 1/22/2013 4:42 PM   
jeffie8696



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Status: offline 		I use 10,000 rpm as a limit for static rpms on any prop for mid sized 4S engines.
In other words I ground test any prop I am interested in trying and if it turns over 10,000 static it might over rev the engine and cause wear, stress on the engine.
I allow slightly higher rpm limits on smaller 4S engines.


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RE: difference in prop types - 1/22/2013 7:11 PM   
SrTelemaster150



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quote:

ORIGINAL: jeffie8696

I use 10,000 rpm as a limit for static rpms on any prop for mid sized 4S engines.
In other words I ground test any prop I am interested in trying and if it turns over 10,000 static it might over rev the engine and cause wear, stress on the engine.
I allow slightly higher rpm limits on smaller 4S engines.


That's a good bench mark for medium sized 4-strokes.

My CDI fired Saito FA91S was spinning a 15 x 4 @ 10,300, a bit more than I liked.

I went to a 15 x 5 & the revs dropped to 9,700, a bit more cushion against overreving in the air.

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RE: difference in prop types - 1/23/2013 12:11 AM   
1QwkSport2.5r



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quote:

ORIGINAL: SrTelemaster150


quote:

ORIGINAL: jeffie8696

I use 10,000 rpm as a limit for static rpms on any prop for mid sized 4S engines.
In other words I ground test any prop I am interested in trying and if it turns over 10,000 static it might over rev the engine and cause wear, stress on the engine.
I allow slightly higher rpm limits on smaller 4S engines.


That's a good bench mark for medium sized 4-strokes.

My CDI fired Saito FA91S was spinning a 15 x 4 @ 10,300, a bit more than I liked.

I went to a 15 x 5 & the revs dropped to 9,700, a bit more cushion against overreving in the air.

Whats the typical rev range for the average OS or Saito 4-stroke?

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RE: difference in prop types - 1/23/2013 12:36 AM   
SrTelemaster150



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quote:

ORIGINAL: 1QwkSport2.5r


quote:

ORIGINAL: SrTelemaster150


quote:

ORIGINAL: jeffie8696

I use 10,000 rpm as a limit for static rpms on any prop for mid sized 4S engines.
In other words I ground test any prop I am interested in trying and if it turns over 10,000 static it might over rev the engine and cause wear, stress on the engine.
I allow slightly higher rpm limits on smaller 4S engines.


That's a good bench mark for medium sized 4-strokes.

My CDI fired Saito FA91S was spinning a 15 x 4 @ 10,300, a bit more than I liked.

I went to a 15 x 5 & the revs dropped to 9,700, a bit more cushion against overreving in the air.

Whats the typical rev range for the average OS or Saito 4-stroke?

Saito FA91S specified max is 11,000 RPM.

Mine idles @ 1700 RPM W/CDI firing things off 11* BTDC @ idle.

Initial full advance timing setting is 35* BTDC.

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