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  #1  
Old 10-14-2018, 06:19 AM
autoglide autoglide is offline
 
Join Date: Aug 2009
Location: Rockport,TX
Posts: 370
Default Fixed pitch prop choices ??

Need to buy prop for a 150 hp -4. Replacing a metal 70 Sensi. Have located for sale 2 choices.....a 68/73 Prince P tip and a 70/75 Pacesetter. The 4 has short gear. Either one will work.........your choice of the two, and why?
Thx, MB
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  #2  
Old 10-14-2018, 09:02 AM
BobRv4 BobRv4 is offline
 
Join Date: Nov 2012
Location: Gilbert, AZ
Posts: 95
Default 68/73

for the 150 I'd go lower pitch. If you are going to upgrade to 160hp (pistons)
go with pacesetter. The pacesetter most likely can be recarved to change pitch. No two props even by the same guy seems to be exactly the same.
(old first generation props, not new carbon mac daddy ones)
Either one will beat the sen metal!
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  #3  
Old 10-14-2018, 09:30 AM
egp8111 egp8111 is offline
 
Join Date: Jan 2011
Location: NC
Posts: 48
Default

I'm running a Sterba 68x78 on my 160hp. short gear RV-4. It seems to perform almost exactly to what others are reporting for a 160hp 4. static rpm about 2350
Different prop makers but I'd think the 68x73 would be about right for the 150 hp. Ground clearence has not been an issue with the short gear flying off a bumpy grass strip but of course all my landings are perfect three pointers (NOT!)

Skip
RV-4 #1904
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  #4  
Old 10-14-2018, 10:14 AM
rv7charlie rv7charlie is offline
 
Join Date: May 2006
Location: Pocahontas MS
Posts: 3,150
Default

You need to ask the mfgrs about suitability of each prop for your engine/airframe. No two mfgrs rate their pitch measurements the same.

Having said that... Given equal blade count, a cruise-optimized larger diameter prop (within reason) will likely outclimb the smaller diameter cruise-optimized, without affecting top speed (at typical RV speeds).

I flew a 72" dia prop (original Bernie Warnke) on a short legged -4. Climbed great, and easily met Van's spec'd cruise numbers.

I'm currently flying a 68" dia wood Sensenich. Cruise is good, but takeoff & climb are abysmal. To be fair, I bought the prop used & don't know if it was recut/modified from its original configuration. The current owner of that -4 I mentioned installed a Sensenich wood after a runway light incident, and achieved the same speeds as the old Warnke.

FWIW,

Charlie
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  #5  
Old 10-14-2018, 10:59 AM
RotaVR RotaVR is offline
 
Join Date: Aug 2011
Location: LaCrosse, WI
Posts: 12
Default

Not sure exactly when but Pacesetter has been out of production for some time. That said, I have flown two separate Pacesetter props with my 160hp RV-4. The first Pacesetter was a 68/69 and was capable of 2800 rpm level flight. I was quite happy with it as I seldom use WOT at cruise. My next Pacesetter was a 68/71 and 2700 was max rpm. Again I liked the prop although giving up a small amount of climb. In my experience the 70/75 Pacesetter might be a little too much for a 150 RV-4 ?
I currently have a Frank Johnson Performance Propellers 69/72 that I am very happy with.
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  #6  
Old 10-14-2018, 11:35 AM
redbaron redbaron is offline
 
Join Date: Aug 2013
Location: Lucerne,Ca
Posts: 234
Smile Prop

Be shure to check out the Whirlwind props. I have a 3 blade on my RV127
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  #7  
Old 10-14-2018, 01:55 PM
autoglide autoglide is offline
 
Join Date: Aug 2009
Location: Rockport,TX
Posts: 370
Default Prop

Am only trying to choose between the two I mentioned.....Im aware of others.....thx
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  #8  
Old 10-14-2018, 05:11 PM
smokyray's Avatar
smokyray smokyray is offline
 
Join Date: Jan 2005
Location: TX32
Posts: 1,747
Default Prop me up...

Quote:
Originally Posted by autoglide View Post
Need to buy prop for a 150 hp -4. Replacing a metal 70” Sensi. Have located for sale 2 choices.....a 68/73 Prince P tip and a 70/75 Pacesetter. The 4 has short gear. Either one will work.........your choice of the two, and why?
Thx, MB
MB,
I would go with the Prince as it’s very durable (composite) and I found (9 props tested) 68-69” diameter is ideal for turf, gravel or rough pavement on my short gear Four. Lonnie Prince also backs his products 100%
The Pacesetter is a good prop as well however, it’s wood, is longer diameter and generally needs more love*... And.....Pacesetter is no longer in business...

http://www.vansairforce.com/communit...=Hertzler+prop
Prince Prop testimonial

V/R
Smokey

*Love= Care and feeding...More susceptible to rain erosion, increased bolt torque frequency, more fragile.

Last edited by smokyray : 10-14-2018 at 06:23 PM.
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  #9  
Old 10-15-2018, 06:33 AM
mike newall's Avatar
mike newall mike newall is offline
 
Join Date: Jan 2005
Location: Yorkshire, England
Posts: 1,650
Default

A buddy bought an RV6A a while ago with a P-Tip prop. I did an evaluation flight on it for him, never flown behind one before, but had heard they were good.

The takeoff was normal with an expected lower rpm but then as I got airborne, the prop kept on unloading and the speed just kept getting higher !!

I fly a 7 with 180hp and MT 3 blade cs prop. He has a 180hp, P-Tip, side by side, he is faster than me !

Downside - lack of aero braking. They are coarsely pitched and you don't slow down that promptly. Once you are aware and comfortable, you plan accordingly and get on with it.

I would recommend the P-Tip.
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