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06-24-2013, 11:27 AM
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Join Date: Dec 2007
Location: SC & CA
Posts: 907
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Jabiru - Cracks in Propeller
I recently noted two ¼ inch hairline cracks on my Sensenich wood propeller Model W62HJ46G. The cracks are on opposite blades. One crack runs perpendicular to the trailing edge and the other runs perpendicular to the leading edge. Neither crack is radiating from a nick in the bIade. The prop has 87 hours on it. I spoke with Charlie at Sensenich and plan to send the prop in for inspection.
I noted that Sensenich offers several ground adjustable props for the Jabiru 2200 & 3300 engines. Their website states that vibration testing has only been conducted on the 80 hp engine. They also have ground adjustable models available for the 85-120 hp engines. If vibration testing has been completed on those models, I may be interested in upgrading the prop.
http://www.sensenich.com/products/item/137
Wrt to Op Limitations, would an upgrade to a ground adjustable prop from fixed pitch constitute a major modification???
The ground adjustable is heavier. The Jabiru cowl is longer than the Rotax cowl. I will also have to consider the impact on Wt & Balance before making a final decision.
__________________
Tom Valenzia
RV8 (Sold)
RV12 Jabiru 2200 Powered (Sold)
Dues contributor since 2007
Learn from the mistakes of others. You won't live long enough to make all of them yourself...Anonymous
Last edited by TomVal : 07-19-2013 at 09:53 PM.
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06-24-2013, 11:43 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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Quote:
Originally Posted by DAGO
Wrt to Op Limitations, would an upgrade to a ground adjustable prop from fixed pitch constitute a major modification???
The ground adjustable is heavier. The Jabiru cowl is longer than the Rotax cowl. I will also have to consider the impact on Wt & Balance before making a final decision.
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Upgrade to a ground adjustable prop does constitute a major change, but you can make that change yourself. Paragraph (19) of your operating limitations tells you how to do it. Basically a logbook entry and back into phase I for at least 5 hrs.
You would only have to submit a new 8130-6 if you changed to a "controllable" propeller. Controllable propeller, in this case, means "cockpit controllable".
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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06-24-2013, 12:52 PM
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Join Date: Dec 2007
Location: SC & CA
Posts: 907
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Quote:
Originally Posted by Mel
Upgrade to a ground adjustable prop does constitute a major change, but you can make that change yourself. Paragraph (19) of your operating limitations tells you how to do it. Basically a logbook entry and back into phase I for at least 5 hrs.
You would only have to submit a new 8130-6 if you changed to a "controllable" propeller. Controllable propeller, in this case, means "cockpit controllable".
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Thanks Mel. I am the second owner of this aircraft. In order to do the 5 hr phase I, I would need my op limits to designate a practice area in my local area. I had to go through this dance with the FAA with my -8 as a second owner in order to open the aerobatic window. The FSDO office initially wanted me to put the aircraft back into a 40 hour phase I just for the aerobatic qualification. I gently persuaded the Fed to just allow me a 5 hr flyoff window and he reluctantly agreed. If I have to go through this dance again, I think I'll on pass on the ground adjustable and just fly where there is no rain.
__________________
Tom Valenzia
RV8 (Sold)
RV12 Jabiru 2200 Powered (Sold)
Dues contributor since 2007
Learn from the mistakes of others. You won't live long enough to make all of them yourself...Anonymous
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06-24-2013, 12:55 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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You should be able to have your op lims amended without an inspection just to change your flight test area. After that you can do everything yourself.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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06-24-2013, 01:10 PM
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Join Date: Dec 2007
Location: SC & CA
Posts: 907
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Quote:
Originally Posted by Mel
You should be able to have your op lims amended without an inspection just to change your flight test area. After that you can do everything yourself.
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I may have to find a DAR willing to amend the op limits. I will be out of town for several months so I have some time to work this out.
Once again, thanks for your input.
__________________
Tom Valenzia
RV8 (Sold)
RV12 Jabiru 2200 Powered (Sold)
Dues contributor since 2007
Learn from the mistakes of others. You won't live long enough to make all of them yourself...Anonymous
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06-24-2013, 07:12 PM
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Join Date: Jun 2012
Location: Hillsboro, OR
Posts: 63
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Just out of curiosity, did you balance the fixed pitch propeller during the 87 hours of operation?
__________________
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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06-24-2013, 07:48 PM
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Join Date: Dec 2007
Location: SC & CA
Posts: 907
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Quote:
Originally Posted by RVTrumpet
Just out of curiosity, did you balance the fixed pitch propeller during the 87 hours of operation?
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No, the prop had not been balanced. Ironically, that and other items was on the agenda to be completed when we return to SC in August. As second owner, I've only flown 7 of the 87 hours on airplane.
__________________
Tom Valenzia
RV8 (Sold)
RV12 Jabiru 2200 Powered (Sold)
Dues contributor since 2007
Learn from the mistakes of others. You won't live long enough to make all of them yourself...Anonymous
Last edited by TomVal : 06-24-2013 at 07:50 PM.
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06-25-2013, 10:29 AM
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Join Date: Dec 2007
Location: SC & CA
Posts: 907
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Jabiru - Ground Adjustable Prop
I’ve located a DAR in SC that is willing to work with me on upgrading to a ground adjustable prop. My limitation at the moment is that I am 2500 miles away from my RV-12 paperwork. I’ll have to confirm that my op lims permit the change and that the wt & balance will work out. The increase in wt should be okay however the affect on C.G. (non-standard longer cowl) may be uncertain.
Just got off the phone with Charlie at Sensenich. Wrt vibration testing on the Jabiru 2200 their website states the following:
Our 2 Blade Jabiru 2200 propeller is suitable for use on the 80HP Jabiru engine. It has currently not been vibration analyzed for use on any other direct drive engine.
Charlie stated that this prop would also work on the Jabiru 2200 85HP engine. Delivery time for the ground adjustable prop would be 3 weeks.
__________________
Tom Valenzia
RV8 (Sold)
RV12 Jabiru 2200 Powered (Sold)
Dues contributor since 2007
Learn from the mistakes of others. You won't live long enough to make all of them yourself...Anonymous
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07-19-2013, 04:50 PM
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Join Date: Dec 2007
Location: SC & CA
Posts: 907
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Well, I got lazy. I decided to forego ordering a new ground adjustable prop and to just send my existing prop in for repair.
My friends pulled the prop and sent it in to Sensenich today. I also spoke with Charlie at Sensenich again. He said the turn-a-round time for my prop would be 2 to 2 1/2 weeks. If I ordered a new ground adjustable, it would take 8 weeks. After OSH orders, it could take even longer.
My sorrows...
I have submitted to only flying in a precipitation free environment.
No one will invite me to be part of a group trip.
I can no longer complain about not being able to fly in the rain.
Feel free to add to the list. 
__________________
Tom Valenzia
RV8 (Sold)
RV12 Jabiru 2200 Powered (Sold)
Dues contributor since 2007
Learn from the mistakes of others. You won't live long enough to make all of them yourself...Anonymous
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07-19-2013, 04:55 PM
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Join Date: Jan 2005
Location: Arlington, TX (DFW)
Posts: 1,164
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The only thing I'd add, is that your plane should go with you to CA, the next time you'll go back 
__________________
Gary Robertson
Arlington, TX
RV-12 Built / Sold / Flying
Currently Flying: Cessna Skyhawk 172
Rebuilding a true barn find J-3 Cub
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