VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-12
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #21  
Old 07-12-2018, 11:24 AM
Piper J3's Avatar
Piper J3 Piper J3 is online now
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 1,117
Default

Quote:
Originally Posted by AirHound View Post
My take they are fixed by thru bolts so immediate BLEW blades less likely...

On the same note....I'll bet cracks will be a challenge to discern....maybe need 10x magnification and or penetrant...All just guessing..
Whoa Nelly... front hub cracked in half and blades retained by shear (not tensile) strength of two remaining bolts per blade compounded by increased vibration.

Not a good warm feeling here...
__________________
-
Jim Stricker
Hinckley, Ohio
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC Jul 2012 - Bought Flying Oct 2015 with 48TT - Hobbs now 406

LSRM-A Certificate 2016
Special Thanks to EJ Trucks

Last edited by Piper J3 : 07-12-2018 at 07:38 PM.
Reply With Quote
  #22  
Old 07-12-2018, 11:32 AM
AirHound AirHound is online now
 
Join Date: Oct 2006
Location: OFallon IL now, everywhere before
Posts: 238
Default

Quote:
Originally Posted by Piper J3 View Post
Wow Nelly... front hub cracked in half and blades retained by shear (not tensile) strength of two remaining bolts per blade compounded by increased vibration.

Not a good warm feeling here...
Thinking, an even tightening/torqueing technique is most important preventative measure.
__________________
Doug
Reply With Quote
  #23  
Old 07-12-2018, 11:35 AM
Piper J3's Avatar
Piper J3 Piper J3 is online now
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 1,117
Default

Quote:
Originally Posted by AirHound View Post
Thinking, an even tightening/torqueing technique is most important preventative measure.
And I'm thinking that installing the new design hub is most important preventative measure...
__________________
-
Jim Stricker
Hinckley, Ohio
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC Jul 2012 - Bought Flying Oct 2015 with 48TT - Hobbs now 406

LSRM-A Certificate 2016
Special Thanks to EJ Trucks

Last edited by Piper J3 : 07-12-2018 at 11:37 AM. Reason: duplicate message
Reply With Quote
  #24  
Old 07-12-2018, 11:43 AM
AirHound AirHound is online now
 
Join Date: Oct 2006
Location: OFallon IL now, everywhere before
Posts: 238
Default

Quote:
Originally Posted by Piper J3 View Post
And I'm thinking that installing the new design hub is most important preventative measure...
Ooooh yeah, bring it on..Probably new wt and bal calculation - built like a battleship..to counter the unknown...
__________________
Doug
Reply With Quote
  #25  
Old 07-12-2018, 01:29 PM
n74846 n74846 is offline
 
Join Date: Sep 2015
Location: Boca Raton, FL BCT
Posts: 106
Default

What is the proper torque for the bolts holding to front spinner attach plate? Are the washers reusable? Thanks!
__________________
Steve at BCT
Flying a built ELSA
Reply With Quote
  #26  
Old 07-12-2018, 02:05 PM
DaleB's Avatar
DaleB DaleB is offline
 
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 1,908
Default

Quote:
Originally Posted by n74846 View Post
What is the proper torque for the bolts holding to front spinner attach plate? Are the washers reusable? Thanks!
It's in the KAI and the maintenance manual - I always look it up and never rely on memory. The bolts use Nord-Lok washers, reusable if you have to remove them.
__________________
Dale
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
-=VAF=- 2017 dues paid
Reply With Quote
  #27  
Old 07-12-2018, 03:39 PM
DHeal DHeal is offline
 
Join Date: Sep 2006
Location: Windsor, California
Posts: 730
Default

Sensenich prop torque values and maintenance requirements are also listed in the applicable Sensenich Installation Instructions document at:

http://www.sensenich.com/documents/

Also, be sure that you install the Nord-Lock lock washers with the proper orientation -- see Sensenich Installation Manual - Figure 4.
__________________
David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B) - N124DH flying since March 2014 - 690+ hours (as of Oct 2018)!
VAF donation through June 2019.

Last edited by DHeal : 07-12-2018 at 03:43 PM.
Reply With Quote
  #28  
Old 07-12-2018, 06:09 PM
KALEWIS's Avatar
KALEWIS KALEWIS is offline
 
Join Date: Nov 2009
Location: Jackson, OH
Posts: 473
Default Newer style Hub PN

Is there a PN for the new style hub? I am guessing it requires the blades sent off to be repinned?

Could not find a PN or price on Sensenich website for the hub only.

Have not looked in the KAI yet, anyone know off hand what size the Nord-Locks are? 9/16" or 1/2" is a guess.
__________________
Airspeed, Altitude, or Brains...you need at least two

RV-12 #328
At 435 Hrs on the Hobbs

Last edited by KALEWIS : 07-12-2018 at 06:11 PM. Reason: more info
Reply With Quote
  #29  
Old 07-12-2018, 07:59 PM
Piper J3's Avatar
Piper J3 Piper J3 is online now
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 1,117
Default

Quote:
Originally Posted by DHeal View Post
I inspected my front hub cover i/a/w the SB and found what appeared to be two cracks in the areas indicated in the SB -- the cracks are very difficult to see. I shipped the hub to Sensenich for their evaluation. My 4.5-year-old RV-12 has 650 hours, the prop was dynamically balanced, and the prop has not been used for pushing/pulling the aircraft on the ground. It will now be interesting to see how Sensenich responds to this issue and how long impacted aircraft will be grounded.
DHeal -

Were you able to inspect the front hub per the SB with the front spinner plate remaining in place or did you have to remove six thru bolts, spacers, and then the front spinner plate?
__________________
-
Jim Stricker
Hinckley, Ohio
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC Jul 2012 - Bought Flying Oct 2015 with 48TT - Hobbs now 406

LSRM-A Certificate 2016
Special Thanks to EJ Trucks
Reply With Quote
  #30  
Old 07-12-2018, 08:04 PM
Piper J3's Avatar
Piper J3 Piper J3 is online now
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 1,117
Default

Quote:
Originally Posted by KALEWIS View Post
Is there a PN for the new style hub? I am guessing it requires the blades sent off to be repinned?
I have set blade pitch on one of the new hubs and it isn't necessary at all to use the rough-in pins for setting initial pitch - just position blades by hand. So my guess is if one were able to get a new design hub with the three smaller holes the existing prop blades can be used as-is.
__________________
-
Jim Stricker
Hinckley, Ohio
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC Jul 2012 - Bought Flying Oct 2015 with 48TT - Hobbs now 406

LSRM-A Certificate 2016
Special Thanks to EJ Trucks
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 06:11 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.