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  #1  
Old 03-21-2021, 09:30 PM
M5fly's Avatar
M5fly M5fly is offline
 
Join Date: Mar 2019
Location: Reno, NV
Posts: 88
Default Aymar-Demuth prop info

Can anyone tell me what numbers Aymar-Demuth used to identify their prop types? I've got one with the composite overlay on my RV that is the 68x72. The serial number, diameter and pitch are written on the data sheet, but that's it. Based on the static RPM on takeoff (2350) and RPM at WOT in cruise (2600) it seems that this might be a climb prop but looking for validation and other info y'all may have.
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Cole Melby

N642RV at KCXP
1992 RV-6A, O-320 150hp
Bought flying, 1/2021

Exemption waived, 2021 donation made
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  #2  
Old 03-22-2021, 05:42 AM
BH1166 BH1166 is offline
 
Join Date: Nov 2017
Location: Eatonton Georgia
Posts: 408
Default Climb

Based on my experience... 2350 is a high static rpm for fixed pitch. I heard your prop was hard to beat, lots of positive comments on the prop.
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Butch
RV6A Purchased N72TX
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  #3  
Old 03-22-2021, 07:39 AM
664781 664781 is offline
 
Join Date: Jan 2005
Location: Powder Springs, Ga
Posts: 321
Default Middle of the road prop

My prop did the same as yours and I was told it was a middle of the road prop. Not climb and not cruise, a little bit of both.
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Kurt Lohmueller A&P, DAR
Powder Springs, Ga
RV6A "Kurt's Toy" - Flying
RV12 - Flying - Sold
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  #4  
Old 03-22-2021, 10:36 AM
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M5fly M5fly is offline
 
Join Date: Mar 2019
Location: Reno, NV
Posts: 88
Default

Quote:
Originally Posted by 664781 View Post
My prop did the same as yours and I was told it was a middle of the road prop. Not climb and not cruise, a little bit of both.
Have you since switched props? If you did, were there any noticeable differences? Went flying with another local 6A owner yesterday who has the 160hp with a Senenich 70x74 and he blew the doors off me. I was WOT and he was running away from me at 2100. He had to throttle back to around 1900 for me to catch up and even that took awhile. His first thought was the prop might be causing this large speed variation. I need to look and see if my engine has the same size studs as his, if it does we might throw his prop on mine and see what kind of a difference it makes. He also noted he's lucky to see 2450 with his setup.
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Cole Melby

N642RV at KCXP
1992 RV-6A, O-320 150hp
Bought flying, 1/2021

Exemption waived, 2021 donation made
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  #5  
Old 03-22-2021, 11:21 AM
Mcmark Mcmark is offline
 
Join Date: Aug 2020
Location: Owings, MD
Posts: 18
Default

I used a 68x71 Prince on a 150hp Smith Mini and got almost 2900rpm WO @ 2500'. Static was about the same.
WO throttle MPH was 155-160 with a draggy biplane.
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  #6  
Old 03-23-2021, 06:56 PM
664781 664781 is offline
 
Join Date: Jan 2005
Location: Powder Springs, Ga
Posts: 321
Default Cato Prop

Quote:
Originally Posted by 664781 View Post
My prop did the same as yours and I was told it was a middle of the road prop. Not climb and not cruise, a little bit of both.
I went with a Cato cruise prop with my o-360-A1A. I picked up 10 mph at WOT. Had to go with a new prop due to finding a crack.

I true out over 200 mph above 7000 feet WOT.
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Kurt Lohmueller A&P, DAR
Powder Springs, Ga
RV6A "Kurt's Toy" - Flying
RV12 - Flying - Sold
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  #7  
Old 03-24-2021, 09:53 AM
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M5fly M5fly is offline
 
Join Date: Mar 2019
Location: Reno, NV
Posts: 88
Default

Quote:
Originally Posted by 664781 View Post
I went with a Cato cruise prop with my o-360-A1A. I picked up 10 mph at WOT. Had to go with a new prop due to finding a crack.

I true out over 200 mph above 7000 feet WOT.
Catto has definitely been my number one choice for a prop change. I'm likely going to do some engine work this fall so I won't want to get a new prop before that, but having an idea of what I want and the differences will help quite a bit. 10mph is a significant improvement.
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Cole Melby

N642RV at KCXP
1992 RV-6A, O-320 150hp
Bought flying, 1/2021

Exemption waived, 2021 donation made
Reply With Quote
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