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08-07-2016, 07:39 AM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,065
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VANS PROP PITCH BRACKET
I used Vans Prop Pitch Bracket. Unit hangs nicely off the trailing edge of the blade and is a very repeatable setup. Took only 30 minutes to get my blades within 0.1 degree of each other. Very easy and precise.
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__________________
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Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622 
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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08-07-2016, 03:45 PM
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Join Date: Jan 2016
Location: santa rosa CA
Posts: 90
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OK, I just checked my pitch, using the method in the pics in the previous post, measuring from the backside of the prop.
Also, I measured a little further in towards the center, at the edge of the inner paint stripe.
My blades are over 2.5 degrees off from each other!!!
No wonder my friend's 12 felt smoother than mine!
I pulled my spinner, and I think I have one of the bad hubs, as the serial number went something like xxxx RB, so I think I have one of the "B" hubs that Sensenich is replacing, or machining .008" from, anodizing black, and sending back.
The plane has 160 hours on it.
For now, I think I'm going to set the blades to their proper pitch and watch and see if anything moves.
Is the "B" hub a mandatory send-in/replace/get fixed item, or is it a "send it in if you have creeping blades" item?
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08-07-2016, 05:12 PM
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Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,247
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2.5 degrees is a lot. You might want to check it again, following the procedure from the start to make sure you got it right. When I find something like that I like to re-check a couple of times so I know it's not a measurement error.
I also have one of the hubs covered by the Sensenich SB or AD (I forget which it is at the moment). I asked them about it. The guy who responded said to watch the pitch setting over time. if it changes, send the hub in. If it doesn't change, keep flying until/unless it's convenient to send it in. Apparently not all of the affected hubs will have problems. He said turnaround is quick, said they have hubs on the shelf to send back. That was the state as of early this year. But if you have that much difference, it could possibly be a sign that your hub is bad. If that's the case I'd be a little concerned about fretting between the hub and blade root.
__________________
Dale
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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08-08-2016, 08:09 AM
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Join Date: Jan 2016
Location: santa rosa CA
Posts: 90
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I reset the blades late yesterday.
I kind of split the numbers.
I was getting around 5000 static, so I added a degree to one and removed a degree from the other, but got both blades reading exactly the same on the gauge, hoping that will be OK.
I know the blades are very close to each other now, so I hope things run more smoothly.
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08-12-2016, 09:30 AM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,065
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I thought I?d add this? I reset my prop to 71.4 per Van?s spec. Pic is taken early this morning.
119 IAS, 125 TAS @ 2200 MSL / 77F, 4.9 GPH. Climb is still 1000 FPM. This is economy cruise setting of 5150 RPM. Retirement is good?
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__________________
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Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622 
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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08-12-2016, 05:38 PM
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Join Date: Feb 2015
Location: Bendigo, Australia
Posts: 113
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Is that with or without wheel pants? Agree retirement is good - especially when an RV12 is part of the plan! My total time is very similar - 145. Also bought flying but at only 25 hrs.
Jack
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08-12-2016, 06:56 PM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,065
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With wheel pants. No lighting or AP. 764 empty weight.
__________________
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Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622 
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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08-12-2016, 07:11 PM
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Join Date: Dec 2011
Location: Hackettstown, NJ
Posts: 459
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Those look like good really good numbers. (Not sure I would rely on the 4.9 gal/hour)
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08-12-2016, 10:05 PM
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Join Date: Sep 2011
Location: Paraburdoo Western Australia
Posts: 52
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Limitations markings
Quote:
Originally Posted by Piper J3
I thought I?d add this? I reset my prop to 71.4 per Van?s spec. Pic is taken early this morning.
119 IAS, 125 TAS @ 2200 MSL / 77F, 4.9 GPH. Climb is still 1000 FPM. This is economy cruise setting of 5150 RPM. Retirement is good?
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Has the normal operating speed range upper limit of 45 - 108 kts and VNE of 136 kts for the RV12 been amended or have the ranges on your display been incorrectly set up or?
__________________
Andrew
RV 120573
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08-12-2016, 11:13 PM
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Join Date: Jun 2012
Location: Hillsboro, OR
Posts: 63
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MPH?
Quote:
Originally Posted by AJSWA
Has the normal operating speed range upper limit of 45 - 108 kts and VNE of 136 kts for the RV12 been amended or have the ranges on your display been incorrectly set up or?
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Considering the ground speed is in MPH in Piper J3's photo, could the IAS and TAS be in MPH too? That'd make sense regarding colors of speed ranges.
__________________
RV addict for life.
NOTE: The information, ideas, and opinions presented in this post are my own and not those of my employer. Build, test, and fly at your own risk.
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