Pitch settings and cruise speed

Hi all,

I'm wondering what others are using for your prop pitch and what cruise speeds/climb rates you're seeing.

I have a 120hp Corvair with a Warp Drive 66" prop (10.0deg) in my 601xlb, and am seeing ~92knots cruise (at 2600rpm) and ~900 ft climb rate.

Thanks

Dale

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Replies to This Discussion

Permalink Reply by Dale Walters on April 26, 2021 at 9:32pm

Hi Peter,

I get about 5 gph at 89knots/2600rpm/7500agl

You?

Permalink Reply by Peter Eiberger on December 27, 2022 at 5:57pm

Here is my data thus far, still in phase 1 testing:

WW 2850cc with Sensenich W64ZKL-35 (64x35, definitely a climb prop).

Full Static RPM - 2980RPM (12:1 AFR)

Flight Data 4740 Density Altitutde:

3200 RPM (WOT) - 87kt indicated 94 True

2880 (-10% RPM, 73% pwr) - 79kt/85kt

2560 (-20% RPM, 50% pwr) - 65kt/69kt

2950 RPM, 12:1 AFR (best power), I get 81-82 kts indicated, and ~6 gph. I do not have a fuel flow meter, so this was measured using one tank only at cruise with a timer. This will probably be my cruise rpm, but leaned to 13:1

I have a Cruzer with 21" mains and 8.00-6 on the nose. 

Permalink Reply by Bryan Walstrom on January 12, 2023 at 11:40am

"Definitely a climb prop"

So what was the "CLIMB?"  

Permalink Reply by charlie rosenzweig on February 21, 2023 at 6:16am

 error in post

Permalink Reply by Peter Eiberger on April 25, 2023 at 7:52am

UPDATE:

Over the past 20 or so hours, the rings have have really seated and the engine definitely makes more power now:

  • WOT in level flight is now 3350RPM @ 92kts indicated (12:1AFR).
  • WOT at 60kts climb is 3150-3170 RPM (12:1 AFR) 
Permalink Reply by charlie rosenzweig on May 16, 2023 at 7:20pm

I appreciate the update.   What pitch were you using on the flight with the latest numbers?  Charlie 

Permalink Reply by Peter Eiberger on May 17, 2023 at 8:15am

Same prop as before: 64 diameter x 35 pitch.

Initial reports on the 64x37 sound like it definitely lowers RPM, but it doesn't climb as well. 

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