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  #1  
Old 10-30-2017, 03:13 PM
Hartstoc Hartstoc is offline
 
Join Date: Aug 2017
Location: Sebastopol,CA
Posts: 37
Default Any one who has actually installed Hartzell 74" composite on RV-7A?

I'm ready to take a big $15K gulp and launch my order for a 74" composite Hartzell and associated spinner for my 7A to replace the Sensenich aluminum FP now installed. Superior XP-IO-360-B1A2. Would love first to hear of any experience out there with this specific swap- anybody? Thanks!
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Otis Holt-
RV-7A (bought)
Built Monnett Moni
Frmr Test Pilot/Author CAFE APR's:
RV-8A, S-7C, Europa, Glastar.
-2017 VAF donation!!-
"RV-Fun is inversely proportional to RV-Weight!"
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  #2  
Old 11-11-2017, 12:13 PM
mfleming's Avatar
mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 100
Question

Wow, Can't believe there hasn't been any response to this post!
Surely someone has this combination!?
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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Empennage (sans fiberglass), ailerons and flaps complete.
Closing up wings.
Donated 2017
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  #3  
Old 11-11-2017, 01:10 PM
KatanaPilot KatanaPilot is offline
 
Join Date: Feb 2015
Location: Locust Grove, GA
Posts: 283
Default Haven't flown yet

We have this prop on our RV-7A but haven't flown, so can't provide any useable data.

It was a great prop on our DA-40 and I expect great performance and durability on the RV-A.

Hope to have the airplane moved from Eugene back to Locust Grove by the end of the year and flying by early February.
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Krea Ellis

Locust Grove, GA and Miramar Beach, FL
DA20-A1 Katana "Princess Amelia"
RV-7A under construction
RV-10 under construction
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  #4  
Old 11-26-2017, 12:51 PM
Skyline Skyline is offline
 
Join Date: Aug 2017
Location: Johannesburg
Posts: 2
Default 74" Hartzell composite

Follow on from Hartstoc's question
I am also interested in understanding the advantages of a 74" Hartzell Composite prop at $13000 against a constant speed at half the price. What makes this prop so special and why is it offered by Vans. I'm keen to hear from someone with experience as I am also about to install a 74" Composite on a 7A
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  #5  
Old 12-14-2017, 11:17 PM
Hartstoc Hartstoc is offline
 
Join Date: Aug 2017
Location: Sebastopol,CA
Posts: 37
Default Hope to answer my own question soon!

Quote:
Originally Posted by mfleming View Post
Wow, Can't believe there hasn't been any response to this post!
Surely someone has this combination!?
I’ve concluded that there must be very few RV’s actually flying this prop and I’m pretty sure the price point is the reason- it just doesn’t quite pass most builder’s intuitive cost-benefit analysis and I totally appreciate that point of view. Advantages over the aluminum blades is probably going to be somewhat marginal, but there should be quite a few of them, so I did place my order and my prop/spinner ships in about a week.

I’m pretty fanatical about weight, especially right at the nose-station, so the 12 pounds saved there means a lot to me. I’m deleting the belt-driven alternator and going with a spline-driven B&C as primary for much the same reason. Any reduction in polar mass makes for a more nimble aerobat. Significantly less gyroscopic inertia will also contribute to maneuverability.

The working blade section on the composite carries much closer to the root because structural issues dictate that that aluminum blades grow so fat there that little thrust, much drag, and considerable turbulance is produced in the region just ahead of the cooling inlets. Both thrust in T.O./climb and pumping action into the cooling inlets should be improved. More sustained high-performance climbs without dangerous CHT levels should be possible- we’ll see. By all accounts I have heard, static thrust is dramatically better with the composite.

The absence of any restricted zones of sustained RPM for the composite blades is also a plus- just one less thing to pay attention to.

Is all this worth a $5K+ premuim? I hope the answer is yes for me, but I don’t expect that it would be for everyone.
__________________
Otis Holt-
RV-7A (bought)
Built Monnett Moni
Frmr Test Pilot/Author CAFE APR's:
RV-8A, S-7C, Europa, Glastar.
-2017 VAF donation!!-
"RV-Fun is inversely proportional to RV-Weight!"
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