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  #51  
Old 05-20-2013, 12:33 AM
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N804RV N804RV is offline
 
Join Date: May 2013
Location: Mount Vernon, Wa
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Quote:
Originally Posted by Kahuna View Post
There is an RV-4 flown by Dave Hirshman that has one. It was at our clininc this weekend.
Is that the AOPA senior editor? If so, when's he gonna do a write up, I wonder?..........
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  #52  
Old 05-23-2013, 02:25 PM
SensenichMike SensenichMike is offline
 
Join Date: Jul 2011
Location: Tampa, FL
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Hi all...


I am the R&D/Design/Test Engineer here at Sensenich, maybe I can clear some things up.

The prop does look similiar to the Whirlwind although we use proprietary airfoils and is a different design.

As shown in the photo, we also have a pitch setting system so there is no need for protractors.

We co-cure our leading edges.

Although it is not required, we have also complied this prop to ASTM standards.


The Spinner Question...
We purchase our spinners from an aerospace manufacturer. It is an all hand laid carbon construction. There are galvanics where the spinner touches metal.



We have over 150 hours on our prototype prop and 200+ hours between our three test props out in the wild. The prototype prop is still in service and accumulating more hours.

If anyone has any questions, I would be more than happy to answer them.
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  #53  
Old 05-23-2013, 05:50 PM
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flyboy1963 flyboy1963 is offline
 
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Location: Lake Country, B.C. Canada
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Default a little history would be very informative

Thanks for jumping in Mike, it's great to 'talk' with the guys in the know.

- how long have you been running this type of airboat prop? I'm really impressed with this...if it can survive that kind of ****, it must be good!
- is the aircraft design appreciably different? How?
somebody is going to ask, so ....
- the aircraft version is double the cost of the airboat. How is this arrived at....I'm not surprised if it's liability insurance or something, just need to know.
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  #54  
Old 05-30-2013, 01:43 PM
SensenichMike SensenichMike is offline
 
Join Date: Jul 2011
Location: Tampa, FL
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Quote:
Originally Posted by flyboy1963 View Post
Thanks for jumping in Mike, it's great to 'talk' with the guys in the know.

- how long have you been running this type of airboat prop? I'm really impressed with this...if it can survive that kind of ****, it must be good!
- is the aircraft design appreciably different? How?
somebody is going to ask, so ....
- the aircraft version is double the cost of the airboat. How is this arrived at....I'm not surprised if it's liability insurance or something, just need to know.
We have had composite propellers since the early 90s.

Yes, the aircraft design is different, mainly in airfoil design. The construction steps are somewhat the same.

The increased aircraft propeller costs are mainly due to the amount of testing involved with developing the product.
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  #55  
Old 05-31-2013, 08:25 AM
Christopher Murphy Christopher Murphy is offline
 
Join Date: Feb 2007
Location: colorado
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Mike,

I am very interested in the prop for my RV-4 but I am concerned about CG

I have a wood prop with a 12lb crush plate now. How can I add weight to the assembly to maintain my CG? I don't see a way to add weight other than a heavy spacer... is one available?

Sure would like to see some real performance numbers.

Chris M
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  #56  
Old 06-05-2013, 12:32 PM
SensenichMike SensenichMike is offline
 
Join Date: Jul 2011
Location: Tampa, FL
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Quote:
Originally Posted by Christopher Murphy View Post
Mike,

I am very interested in the prop for my RV-4 but I am concerned about CG

I have a wood prop with a 12lb crush plate now. How can I add weight to the assembly to maintain my CG? I don't see a way to add weight other than a heavy spacer... is one available?

Sure would like to see some real performance numbers.

Chris M
Our prop assembly is about 18 lbs without the spacer. Depending on what spacer you go with, you may be ok.
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  #57  
Old 06-05-2013, 01:35 PM
EAGLE BOB EAGLE BOB is offline
 
Join Date: Apr 2007
Location: Redding, CA
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The sensenich GA prop is a good option, but there is an other prop that is the Whirl Wing Ground Adjustable that sell for around $2,500.00, plus spinner.

We will have it on display at Oshkosh in Building B2047/2048.

Bob-American Propeller
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  #58  
Old 06-05-2013, 06:02 PM
BillC BillC is offline
 
Join Date: Mar 2005
Location: Ramona, Ca
Posts: 259
Default Initial Test Results

Some initial comparison numbers between the Sensenich metal prop and new composite prop.
*Composite prop + spinner + spacer is ~13 lbs lighter than equivalent metal prop combination.
*All speeds are true air speeds recorded on Dynon D100 which was within 1kt of the NTSP GPS 3 leg ground speed calibration @ 160 kts.

Test aircraft: RV-9A, 160 hp O-320-D2G 1393ft field elevation

70CM6S9-79 Static 2270 RPM
RPM limited 161 kts, 2600 RPM @ 8500ft density altitude
RPM limited 161 kts, 2600 RPM @ 10500ft density altitude
WOT 161 kts, 2620 RPM @11700ft density altitude

2G0M7/C72RG-0 (Gnd Adj Composite)
Pitch Pin #4 Static 2340 RPM
WOT 164 kts, 2727 RPM @ 8500 ft density altitude
WOT 164 kts, 2705 RPM @ 10500 ft density altitude

Pitch Pin #5 Static 2271 RPM
WOT 163 kts, 2660 RPM @ 8500 ft density altitude
WOT 161 kts, 2613 RPM @ 10500ft density altitude

Don't have any climb numbers yet and I will be trying the finer pitched #3 pin later.

Bill
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Last edited by BillC : 06-28-2013 at 01:42 PM. Reason: Typo
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  #59  
Old 06-06-2013, 04:24 AM
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KRviator KRviator is offline
 
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Location: Sydney, Aust.
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Mike,
I've got a new low-compression ECI OX-340S, that should develop ~160HP. Is the derated -340 a contender for this prop as well, or is it strictly limited to the -320 series?
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  #60  
Old 06-08-2013, 06:31 PM
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Jesse Jesse is offline
 
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Smokey Ray may be coming up this week to finally do the day of testing the different pitch options of the Sensenich as well as comparing it to the 2-blade Catto. Actual numbers aren't the goal as much as comparison numbers. Some have said that the pitch on our Catto isn't what they would recommend, but it is what Craig recommended for our 150hp setup, so we will see how it goes. I know we hoped for these numbers months ago, but we had other projects trump the -9A for a while. I am really enjoying it, though. Incredibly efficient!
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