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  #1  
Old 09-21-2017, 04:05 PM
DonFromTX's Avatar
DonFromTX DonFromTX is offline
 
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Location: La Feria Texas
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Default Pin Style Prop Settings

I sent my Sensenich two blade prop back to Sensenich for upgrade to the new hub and settings. Essentially you are furnished a set of pins which you stick in a hole of the new hub, then rotate the blade until the newly installed pins installed by Sensenich contacts.
I cannot find anyone in the archives that has done this, and I was wondering how well this new method gets the blades equal with each other, and which pin others have found to result in the most favorable pitch.
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  #2  
Old 09-21-2017, 04:12 PM
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Quote:
Originally Posted by DonFromTX View Post
I sent my Sensenich two blade prop back to Sensenich for upgrade to the new hub and settings. Essentially you are furnished a set of pins which you stick in a hole of the new hub, then rotate the blade until the newly installed pins installed by Sensenich contacts.
I cannot find anyone in the archives that has done this, and I was wondering how well this new method gets the blades equal with each other, and which pin others have found to result in the most favorable pitch.
Stretching my recollection a bit but I seem to remember starting with a number 3 pin. That only got me in the ballpark and I used a digital level and Van's fixture to fine tune it and get the blades pitched exactly the same.
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  #3  
Old 09-21-2017, 04:31 PM
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DonFromTX DonFromTX is offline
 
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That would be disappointing, I had hoped for all the bucks spent I could get it right on with the pins. I have the Sensenisch slip on the blade tool to check them with if necessary.
Quote:
Originally Posted by tomkk View Post
Stretching my recollection a bit but I seem to remember starting with a number 3 pin. That only got me in the ballpark and I used a digital level and Van's fixture to fine tune it and get the blades pitched exactly the same.
__________________
AF1 (was RV12) EAB Air Force One, SN 461, N461DG VIKING/HONDA ENGINE POWERED! AND N756TS ROTAX POWERED
A&P, PP-SEL, Pathological Flier, EAA Technical Counselor
EAA Chapter 595 President,http://www.595.eaachapter.org/index.htm
Retired US Army Officer
http://www.mykitlog.com/users/index....X&project=1903
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  #4  
Old 09-21-2017, 04:43 PM
rvbuilder2002 rvbuilder2002 is offline
 
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It has been discussed in the archives in the past.
As Tom mentioned, pin 3 is the recommended starting point.
The difference between each pin # is quite a bit so most people end up somewhere in between.
Since a smooth running engine requires blades to be pitched within .1 degrees of each other, you have to measure it. Neither the old style or new style hub gets the blade pitch relationship accurate enough.
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  #5  
Old 09-21-2017, 06:19 PM
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Piper J3 Piper J3 is offline
 
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The sheetmetal gauge from Van's, when used with a precision digital level, works very well to set blades within 0.1 degree pitch.

I have my blades set at 71.4 with the Rotax 912 engine. Performance matches Van's published figures and engine/prop run very smooth without need for dynamic balancing.
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  #6  
Old 09-21-2017, 06:35 PM
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Phantom30 Phantom30 is offline
 
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Quote:
Originally Posted by Piper J3 View Post
The sheetmetal gauge from Van's, when used with a precision digital level, works very well to set blades within 0.1 degree pitch.

I have my blades set at 71.4 with the Rotax 912 engine. Performance matches Van's published figures and engine/prop run very smooth without need for dynamic balancing.
I've tried different settings, but agree with Piper J3...71.4 works best (at least for me). Both blades dead on..is running super smooth! Digital level is easiest...as you set reference angle as per instructions.
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Last edited by Phantom30 : 09-21-2017 at 06:37 PM.
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  #7  
Old 09-22-2017, 08:25 AM
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DonFromTX DonFromTX is offline
 
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Thanks Scott, that is the info I needed. I was unable to get that from the archives, and supposed it was not a Vans option. Sensenish sold me on their idea that the old nylon button was not accurate, but that the new pins were to be totally accurate. I guess that is not the case. I have the Sensenish blade angle tool, guess I will have to fine tune the settings that way.
Quote:
Originally Posted by rvbuilder2002 View Post
It has been discussed in the archives in the past.
As Tom mentioned, pin 3 is the recommended starting point.
The difference between each pin # is quite a bit so most people end up somewhere in between.
Since a smooth running engine requires blades to be pitched within .1 degrees of each other, you have to measure it. Neither the old style or new style hub gets the blade pitch relationship accurate enough.
__________________
AF1 (was RV12) EAB Air Force One, SN 461, N461DG VIKING/HONDA ENGINE POWERED! AND N756TS ROTAX POWERED
A&P, PP-SEL, Pathological Flier, EAA Technical Counselor
EAA Chapter 595 President,http://www.595.eaachapter.org/index.htm
Retired US Army Officer
http://www.mykitlog.com/users/index....X&project=1903
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  #8  
Old 09-22-2017, 09:33 AM
rvbuilder2002 rvbuilder2002 is offline
 
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Location: Hubbard Oregon
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Quote:
Originally Posted by DonFromTX View Post
Thanks Scott, that is the info I needed. I was unable to get that from the archives, and supposed it was not a Vans option. Sensenish sold me on their idea that the old nylon button was not accurate, but that the new pins were to be totally accurate. I guess that is not the case. I have the Sensenish blade angle tool, guess I will have to fine tune the settings that way.
The current Rev. KAI section for propeller installation mentions using pin 3 as the starting point.
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  #9  
Old 09-22-2017, 01:34 PM
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Piper J3 Piper J3 is offline
 
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Quote:
Originally Posted by DonFromTX View Post
Sensenish sold me on their idea that the old nylon button was not accurate, but that the new pins were to be totally accurate. I guess that is not the case. I have the Sensenish blade angle tool, guess I will have to fine tune the settings that way.
I wouldn't even use Sensenich's blade angle tool. I would get the sheetmetal pitch gage from Van's. Very accurate and repeatable...
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Jim Stricker
Hinckley, Ohio
P/ASEL 1970 Sport Pilot since '04
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
LSRM-A Certificate 2016
RV-12 E-LSA #120058 AWC 7/12 Bought Flying 10/15 with 48TT - Hobbs now 317
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  #10  
Old 09-22-2017, 04:30 PM
smithflys23 smithflys23 is offline
 
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Location: Jupiter
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I'm going to be pretty upset if the pin system is not accurate. I paid a premium for this prop over the Whirlwind GA, because this pitch pin system promises easy pitch adjustments.
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