Hartzell Composite vs. Whirlwind Composite - Page 9

Uptown2k · #81 12-10-2017, 08:54 AM

Looking forward to these results

Uptown2k · #82 01-22-2018, 06:45 AM

Checking in to see if you had any numbers to share with us

Bob Martin · #83 01-22-2018, 09:51 AM

We have had some fitting issues, but getting them resolved.
Inital numbers are good/faster.
Main thing is 18 lbs lighter......prop and spinner combo.
Very pretty prop too...
I say this and it sounds hollow but it is true. A prop up until now has been a hunk of wood or metal with various paint jobs.
This prop has a finish that would rival the best paint job out there. Almost TOO pretty. One really has to be careful using powerful tools to torque nuts and safety wire etc around this prop.
Normally a prop just gets a cleaning or a wipe down, etc, but this prop begs for wax and to be taken care of.

Northernliving · #84 02-10-2018, 07:58 PM

Quote:

Originally Posted by Bob Martin

We have had some fitting issues, but getting them resolved.
Inital numbers are good/faster.
Main thing is 18 lbs lighter......prop and spinner combo.
Very pretty prop too...
I say this and it sounds hollow but it is true. A prop up until now has been a hunk of wood or metal with various paint jobs.
This prop has a finish that would rival the best paint job out there. Almost TOO pretty. One really has to be careful using powerful tools to torque nuts and safety wire etc around this prop.
Normally a prop just gets a cleaning or a wipe down, etc, but this prop begs for wax and to be taken care of.

Bob, any additional performance numbers on the prop?

Thanks, Brian

gereed75 · #85 02-11-2018, 10:21 AM

Bob, I am sure you have considered the effect on cg that this change will cause.

Several hundred hours ago, I switched from a 200rv to a hartzell Aluminum to gain 19 pounds on the nose. The cg moved from tending towards aft to right in the middle of the range. The flying characteristics are substantially improved. a 6 with aft range cg?s can be very sensitive in pitch, have tendencies to bounce landings and limits aft baggage in a meaningful way.

Hope you are not going there.

Bob Martin · #86 02-13-2018, 12:26 PM

Quote:

Originally Posted by Northernliving

Bob, any additional performance numbers on the prop?

Thanks, Brian

Brian,
No final numbers, preliminary numbers are good.
4mph faster at low cruise.
Time to climb to 8K was 6 seconds faster.

We had fitting issues with our James cowl and WW had us install a coarse stop ring in the hub. We are testing now for flight envelope. adjusting governor, etc. Once we are set, we will rerun the speed and time to climb tests.

Bob Martin · #87 02-13-2018, 12:33 PM

Quote:

Originally Posted by gereed75

Bob, I am sure you have considered the effect on cg that this change will cause.

Several hundred hours ago, I switched from a 200rv to a hartzell Aluminum to gain 19 pounds on the nose. The cg moved from tending towards aft to right in the middle of the range. The flying characteristics are substantially improved. a 6 with aft range cg?s can be very sensitive in pitch, have tendencies to bounce landings and limits aft baggage in a meaningful way.

Hope you are not going there.

Gary,
Thanks for the input. I will look at the W&B, we have a recent one!
Our -6 went from a wood prop to a metal Sensenich to a C/S Hartzel to a James cowl conversion that included a 2.25 extension.
So we have gotten heavier and pushed the heavy prop farther out.
Taking 18 lbs off the nose seems like a wonderful thing.
It also made our wallet thinner.

gereed75 · #88 02-13-2018, 09:09 PM

Hmm, interesting journey. I thought at one time that the extended James cowl with composite prop might be the optimal six configuration. Go for it and good luck!

scrollF4 · #89 11-20-2018, 08:01 PM

Quote:

Originally Posted by ronschreck

Hi Krea,

I don't have the engineering expertise of Steve Smith but I do have real-world experience with both props. I flew my RV-8 with a WW 200RV for about 1500 hours. I was given a Hartzell composite, wide blade prop when Hartzell sponsored our Team AeroDynamix.

Ron,
A friend of mine is contemplating the change from the WW to the Hartzell composite CS prop. When you made this conversion, how well did it fit with your existing cowling? Or did it require surgery on the cowling for fit?

ronschreck · #90 11-21-2018, 03:52 AM

Quote:

Originally Posted by scrollF4

Ron,
A friend of mine is contemplating the change from the WW to the Hartzell composite CS prop. When you made this conversion, how well did it fit with your existing cowling? Or did it require surgery on the cowling for fit?

When we first mounted the props there were several that hit the cowling at high pitch so we sent them all back to Hartzell and they gave us props with a hub that put the blades and inch further forward. No clearance issues with the new hub and that is the hub that is currently provided. No surgery required.