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-   -   Aymar Demuth to Catto 3 blade (https://vansairforce.net/community/showthread.php?t=116687)

psalter 09-20-2014 07:32 PM

Aymar Demuth to Catto 3 blade
 
Neal,

I miss the Christin Eagle sometimes, but the RV is such a relaxing and fun plane to fly, I am glad I made the trade. Tell Tim hello for me.

Phil

Karbonkid 10-13-2014 04:54 PM

OK, slow progress on getting real numbers but I do have close ones that I will narrow down in the next week or so.

This weekend I flew from new orleans over to the thomasville, GA fly in. Fun time nice group and great food. I only stayed for sat but many were camping over the weekend.

so, on the way back
10,500
2400 rpm ~140mph ind /168 true
2500 rpm ~148mph ind / 177 true

The A/D was ~10mph faster

two things that come to mind, the three blade has a larger diameter nosecone and I am now running 20lb crushplate.

would you guys expect these to reduce speed by ~10mph?

just looking for similar experiences and thoughts.

I am very happy with the prop and it is smooth now that I rotated 1 bolt hole clockwise (why this did anything I have no idea)

AZtailwind 10-13-2014 06:12 PM

Quote:

Originally Posted by Karbonkid (Post 924788)
OK, slow progress on getting real numbers but I do have close ones that I will narrow down in the next week or so.

so, on the way back
10,500
2400 rpm ~140mph ind /168 true
2500 rpm ~148mph ind / 177 true

The A/D was ~10mph faster

two things that come to mind, the three blade has a larger diameter nosecone and I am now running 20lb crushplate.

would you guys expect these to reduce speed by ~10mph?

just looking for similar experiences and thoughts.

I am very happy with the prop and it is smooth now that I rotated 1 bolt hole clockwise (why this did anything I have no idea)

Did you measure both props at full throttle?

A measure at WOT at the similar weather conditions and altitude. That would be your best static data point to start from. If you have accurate fuel flow and MAP measurement- use those also. Then you could measure similar power settings/conditions at what TAS. The RPM setting is a minor power data point with different prop comparisons since that will vary.

Karbonkid 10-15-2014 09:27 AM

You know I never thought about it, I have no idea what my power setting is with my setup ... Just picking rpm at altitude. I will get wot at altitude so then approx power setting is known.


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