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  #1  
Old 07-20-2018, 10:20 AM
n233va n233va is offline
 
Join Date: Jul 2014
Location: Prescott, AZ
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Default Whirlwind Prop on RV12

Anyone have a Whirlwind on a 12? If so, what has been your experience?Seriously considering and alternative to the Sensenich.
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  #2  
Old 07-20-2018, 12:56 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
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Advise if/when you sell your 2-blade Sensenich.
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PPL/ASEL 1970 Sport Pilot since 2004
80 hrs Flying Aeronca Chief 11AC
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RV-12 E-LSA #120058 AWC Jul 2012 - Bought Flying Oct 2015 with 48TT - Hobbs now 380

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  #3  
Old 07-20-2018, 02:25 PM
Mitch757 Mitch757 is offline
 
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Location: Falmouth, MA
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I got a quote for 70" 3 blade Whirlwind and 9.75" spinner for $1950 shipped. My prop is the newer model Sensenich so it may be for sale in the future.

Mitch Garner
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  #4  
Old 07-21-2018, 01:02 AM
HansLab HansLab is offline
 
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Location: Netherlands
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Not only A alternative: THE alternative, in my opinion. More climb, more cruise, specially designed for Rotax,and affordable as well. Was a nice article about it in Experimental July 2012. I'm not at that stage, yet, but the info is on the pile next to my pillow :-))
Anyone that has real-life experience is welcome, needless to say.
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  #5  
Old 07-21-2018, 09:11 AM
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Tony_T Tony_T is offline
 
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Location: Lacey, WA
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Default Unknowns re: Whirlwind

The Whirlwind seems reasonable cost wise. However, in looking at the installation instructions, I don't see that the hub has a hole for the RV-12 (unique) pitot tube. If they make a hole for us then the whole issue of cracks become a possibility.

Also, the prop blades are ground adjustable by protractor/digital level the same as the Sensenich so you have the same rigmarole only in the case of a 3 blade, one more blade to try to set to within 0.1° or 0.2°. And you must completely disassemble and re-pitch this prop annually. https://whirlwindpropellers.com/airc...structions.pdf

If I read the current Sensenich documents correctly, even after replacing the front hub cover, you still have to disassemble the hub to torque check the hub/engine flange bolts annually. See page 7 of the FAQ for SB2016-06B. (Correction: replacing the front hub cover does eliminate the requirement for annually re-torque of the engine flange bolts)

I no longer want to mess with these ground adjustable props. What I do want is a fixed pitch prop. In light of current developments I think such a prop is likely to become available. The sooner the better, IMO.
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Last edited by Tony_T : 07-21-2018 at 12:25 PM. Reason: Correction
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  #6  
Old 07-21-2018, 10:02 AM
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Piper J3 Piper J3 is offline
 
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Yes, but pitch angle for one plane may not be correct for another.

Case in point... I have lots of experience setting pitch on the two-blade Sensenich. I adjusted pitch on a relatively new SLSA RV-12 and liked the performance so much that I copied the angle to my prop. Didn't duplicate performance at all. I ended up with 1 steeper pitch to achieve same climb and cruise performance. Both planes are based at same airport. For the above example I used same high-quality tools and technique on both planes...
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Jim Stricker
Hinckley, Ohio
EAA #499867
PPL/ASEL 1970 Sport Pilot since 2004
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 380

LSRM-A Certificate 2016
Special Thanks to EJ Trucks
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  #7  
Old 07-21-2018, 10:07 AM
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Piper J3 Piper J3 is offline
 
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Quote:
Originally Posted by Tony_T View Post
If I read the current Sensenich documents correctly, even after replacing the front hub cover, you still have to disassemble the hub to torque check the hub/engine flange bolts annually. See page 7 of the FAQ for SB2016-06B.
Tony - Page 7 says "This option will permanently comply with the service bulletin, remove the 50 hour inspection interval and also eliminate the annual re-torque for the mounting bolts under the blades. This means the only re-torque at annual will be the clamp bolts."
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Jim Stricker
Hinckley, Ohio
EAA #499867
PPL/ASEL 1970 Sport Pilot since 2004
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 380

LSRM-A Certificate 2016
Special Thanks to EJ Trucks

Last edited by Piper J3 : 07-21-2018 at 10:09 AM.
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  #8  
Old 07-21-2018, 10:21 AM
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KALEWIS KALEWIS is offline
 
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Catto has a 3 blade fixed pitch
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  #9  
Old 07-21-2018, 12:23 PM
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Tony_T Tony_T is offline
 
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Quote:
Originally Posted by Piper J3 View Post
Tony - Page 7 says "This option will permanently comply with the service bulletin, remove the 50 hour inspection interval and also eliminate the annual re-torque for the mounting bolts under the blades. This means the only re-torque at annual will be the clamp bolts."
Yes, I see. Thanks for the heads up, I didn't read far enough. That is an important point.

Thanks for saving me from myself.
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RV-12 #202 -- Flying

Last edited by Tony_T : 07-21-2018 at 12:28 PM.
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  #10  
Old 07-21-2018, 12:37 PM
AeroDog AeroDog is offline
 
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Location: New London, NC (near Charlotte), Boulder, CO
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Quote:
Originally Posted by KALEWIS View Post
Catto has a 3 blade fixed pitch
I haven't seen performance numbers on the Catto, but it's $4500 for prop and spinner. It does have the hole for the Pitot. Based on other stuff Catto does, it's probably the best one out there.

Does anyone know which 3-bladed prop Van's was testing for the iS? The last word I heard about that was that it probably wouldn't be available for the ULS.
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