Prop Question- 3 blade vs 2- Catto vs Sensenich

[chrishalfman]

Originally Posted by RVbySDI

..... There is a gentleman in Kansas who retains the rights to manufacture the Ellipse props designed by Paul Lipps. I cannot recall his name but he does fly an RV6 with an Ellipse prop. He has also designed his wingtips in the similar shape as the prop tips. It is a unique looking RV6 when you see it......

I believe that gentleman is Jim Smith.

http://www.vansairforce.com/communit...p?t-54702.html

[RVbySDI]

Originally Posted by chrishalfman

I believe that gentleman is Jim Smith.

http://www.vansairforce.com/communit...p?t-54702.html

Thank you for posting. He gave me a business card several years ago but I have not been able to locate it or recall his name.

[maus92]

Hello:

I just did a WOT test on my RV-8A to help the Catto peeps with my (potential) prop order. I should note that my nose gear fairing is currently removed. Anyway, the stats:

166Kts TAS @8,500' 2650 RPM, 2 bladed Sensenich FP metal prop.

This seems a tad slow.... What should I expect from a 3-bladed Catto? I'm leaning towards a prop slightly pitched for speed over climb - my home field has 2 long paved runways, and most airports I visit are at least 2000.' However, I'm thinking about joining in on formation flying, and those guys usually have CS (I'm not going to make that jump just yet.)

Thx.

UPDATED INFO: Also, developing 73% power, full rich, 29F OAT.

[N941WR]

Not an -8 but my O-360 powered -9 with a 2 bladed Catto will true out at 174 kts at 8,000' DA. All in and leaned for best power.

While I have a longer wing and no nose wheel, the speeds should be closer than that.

The 2,000' runway should not be an issue.

When doing formation work, just make sure lead knows and if they are any good, they will not close the throttle on you so they can watch you go sailing on by.

No worries, enjoy the Catto.

[rvbuilder2002]

Take-off distance for an RV-8A with a 180 HP and a constant speed prop is spec'ed at 575' so figure on a fixed Catto doing about 650-700 at gross weight (still very good all things considered)

[brad walton]

Don't underestimate the value of the nose wheel fairing. It's got to be worth several knots at least.
I asked Catto for Van's numbers on my RV8 with a Superior IO360. I get 178 ktas at 2700 rpm's from my 3 blade 68x75 at 8000 feet da.

[maus92]

Originally Posted by brad walton

Don't underestimate the value of the nose wheel fairing. It's got to be worth several knots at least.
I asked Catto for Van's numbers on my RV8 with a Superior IO360. I get 178 ktas at 2700 rpm's from my 3 blade 68x75 at 8000 feet da.

The fairing is off because I installed the redesigned fork / shortened nose gear leg late last summer, and haven't modified the fairing to accept the new bracket arrangement. It's on the list though...

[MikeS]

It was some time ago but the last time I checked into this forum I found Paul's old entries . . . but now either I'm typing a name wrong or Paul's entries have been moved into some less accessible area?

Anybody can direct me please?

Mike