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Looking forward to these results :)
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Any results???
Checking in to see if you had any numbers to share with us
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Not yet
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. |
Performance?
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Thanks, Brian |
Cg considerations
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. |
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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. |
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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. :rolleyes: |
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!
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What about the cowling?
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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? |
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Any thoughts about overhaull experiences and costs comparing the 3? |
Overhal costs
I did some research today on overhaul costs and thought I would share the data since I never saw a response to your post.
An MTV-15 2-blade composite overhaul starts around $3,300 An MTV-12 3 blade composite overhaul starts around $4,100 A Whirlwind 74HRT "Teardown Inspection" as they call it starts around $650 I don't have any info on the Hartzell. Of note, the MT TBO is 1,800 or 72 months while the Whirlwind TBO is 600 or 72 months. Seems to me that if you don't fly much and will hit the 72 month mark before the 600 hours then the Whirlwind is significantly less expensive to "inspect / overhaul". I would assume though that if any issues are found during the inspection that the price would quickly go up. |
Jon,
Seems like more info needed. As for me, I sent our WW prop back to WW and stuck with our Hartzel. The HRT74 didn't play well with a James cowling and the long lead times on other options had us wanting to stick with a known quanity for now and update in the future. But for now...... One thing I noticed in the WW and sure it pertains to all composites in the beautiful finishes. Almost too perfect as to make any imperfection stand out. So when we as pilots or owners think about OH's the question is one, the hub, but 2 is the blades. When a aluminum blade has minor knicks the OH'er can regrind the blade, within limits, and we know what that costs, lets just say 2 to 3K.... Not sure I had heard about costs to repair a composite blade. Now, I don't know and to be fair, in the aluminum blade example above if it's out of limits, it becomes a airboat prop of a wall decoation or a recycleable. And maybe the composite prop can be repaired and repainted when in bad shape, so there are pros and cons. Bottom lines is it seems to be hard to compare apples to apples. |
Rotol blade replica 72"
Hi all,finally the Rotol/Spitfire blade replica 72" was tested on a new RV7 stock 180 HP. It's 19 pounds lighter compared stok metal blasdes and is very very smooth.Here's attached some numbers from the Garmin. Looks not bad,what about your numbers with different prop on same frame/engine combo please?
Thanks, Alex ![]() ![]() ![]() |
Hartzell composite C/S prop with Sam James Cowl
I am in the process of converting my RV7A from a Fixed to a C/S prop. I want to go with the Hartzell 74" composite 2blade. Apparently a "stock" Vans cowl accepts the Hartzell (or anyone else's) hub with no problem. However my Sam James cowl is 1 3/4" longer than stock Vans. When using a fixed pitch prop you use a 2 1/4" spacer between the crank/flywheel and the prop hub. I use a 4" spacer on my F.P. Sensenich. I have been unable to determine if Hartzell makes a hub that will fit my Sam James cowl. Vans doesn't seem to know the answer, nor does Sam James. I'm yet to speak to anyone from Hartzell. Has anyone on the forum ever installed a Hartzell composite C/S prop on a Sam James cowl?
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I?ve owned two of f the three
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Hartzell red tagged the blades and offered me new blades at a price that exceeded what a new prop would cost. They refused to repair my blades but in red tagging them, permanently xxxx?d out the serial numbers on each blade ensuring no one else would repair them either. Hartzell publishes lots of marketing material stating how these composite blades have an infinite life and are infinitely repairable. I have never been given any reason what so ever as to why they deemed these blades un-airworthy or why they would not repair them. I then bought a brand new MT three bladed prop. The MT has been trouble free, smooth and looks great. I don?t think it pulls quite as hard as the Hartzell did. I have not had to OH it yet but at 6 years now it throws no grease and the blades are just as tight as when I bought it. I loved my Hartzell but the fact that they would red tag a set of blades with no reason given means I will likely buy MT for my next plane. |
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Here are the part numbers I used to order - Prop part #M2R50100X Spinner part #D-4798P Hope you are sitting down when you see the price ;) |
Hartzell C/S Prop with Sam James Cowl
Thank you Bill and Katana Pilot for the very useful information! I'll be calling Hartzell Monday AM to confirm that they have everything that will work for me. oh yeah, and I'm sure the price will knock me dead!
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