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  #11  
Old 03-11-2015, 05:08 PM
RetiredRacer RetiredRacer is offline
 
Join Date: Apr 2009
Location: Ipswich QLD Australia
Posts: 245
Default Catto props

Hi soarandtow, I've got a 9a with a 0235 C2C (115 max power, plated 108 hp). This a/c weighed 893 lb empty, but in the four years since getting it into the air (with a few minor changes) it has crept up to 905 lb. I mention the weight as part of your consideration for your choice of prop. The engine is another part.

The C2C is a low compression engine 6.7-1. It is fitted with duel P-Mags, Rotec TBI, 1 1/2" Vetterman crossover exhaust and a Catto prop.

I've had two Catto props on this 9a, 60" pitch two blade and a 64" pitch 2 blade. The 60" got off the ground about 40' quicker and climbed about 50' pm better but cruising @ 2400 rpm the 64" sat the IAS on 120 kts where the 60" sat the IAS on 118 kts. At that RPM the 64" sat the fuel flow meter at 20 Lph and the 60" at 22 Lph. At altitude when cruising at this IAS, TAS is usually around 140 kts. There is 100 rpm difference between the two props on t/o and climb out.

I now only use the 64" pitch prop.

This may interest you, I live in QLD Australia and I've just returned from a trip to Victoria (850 nm each way). Because I had a good tail wind on the way back I pulled the throttle back to cruise at 115 kts IAS (137 TAS). this resulted in 6.1 hrs for the trip and averaged 17.9 Lph ROP. I believe the awesome economy comes from the Rotec TBI and the duel P-Mags, the 1 1/2" exhaust would also contribute to that!

Hope that is of some help!

Bob
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  #12  
Old 03-12-2015, 08:32 PM
gorbak gorbak is offline
 
Join Date: Dec 2005
Posts: 319
Default 235 L2C

We used a Catto composite two blade prop on a RV9A with Lycoming O-235 L2C 118 hp engine that had around 940 TTSN and some of the data was at follows a:

following phase I data is now available:
After a square two minute each leg track at 5500 feet, (Temp 4 C), the average speed equates to 148.25 knots which works out to be 170.49 MPH.
One minute climb at 65 F and Vy = 87 MPH was 1075 feet per minute with aircraft weight at 1400 pounds.
Stall at Vso = 45 MPH and stall at Vs = 49 MPH
Fuel flow is between 5.5 to 6.0 GPH

Pat Garboden
Katy, TX
RV9A
Dues paid
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  #13  
Old 03-30-2015, 08:02 PM
FlyingSlowly FlyingSlowly is offline
 
Join Date: Mar 2015
Location: Ohio
Posts: 5
Default

Quote:
Originally Posted by gorbak View Post
We used a Catto composite two blade prop on a RV9A with Lycoming O-235 L2C 118 hp
What is the pitch, please??

RetiredRacer, thanks for all the info. I plan on building an RV-9 when funds allow with the O-235 and there seems to be little actual data available. Too many with the O-320 (or even bigger!!).
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  #14  
Old 03-31-2015, 11:54 AM
JSOliveira JSOliveira is offline
 
Join Date: Jul 2011
Location: Port Townsend, Washington
Posts: 77
Default

Vans 9a prototype had 0235. As them which prop they recommend. They have experience with that combination.
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John O
RV9a N709RV
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  #15  
Old 03-31-2015, 06:22 PM
glenn654 glenn654 is offline
 
Join Date: Feb 2005
Posts: 592
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As mentioned the Catto Props are excellent....I flew one for ten years.

But you will also want to do some thorough weight and balance evaluation to see if a little extra weight on the nose will improve CG and baggage load capacity.

The extra weight of a Sensi could be very useful and I don't think there would be a significant performance difference.

Good Luck with your choice.

Glenn Wilkinson
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