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03-25-2019, 06:24 PM
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Join Date: May 2015
Location: Albuquerque NM
Posts: 10
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Otis,
Great review and pictures!
I have an RV-4 with older non-BA Hartzell CS prop that I want to swap for something composite.
Anyone out there with the composite Hartzell on an RV-4?
My plane has a Sam James cowling which makes things a bit more difficult due to the flat front which brings the cooling inlets parallel with the cowling behind the spinner. After many emails and phone calls to WW and engineers at Hartzell I ordered the Hartzell N7605W-2X blades with extended hub today. The WW would have required a large spacer which I would rather avoid.
Now I have to sit and wait 10 weeks but look forward to formation flying and aerobatics with the new Hartzell.
__________________
RV-4 Purchased, Flying
C182 TurboRG, Flying
Citabria 7GCBC, Traded
Citabria 8KCAB, Sold
Mooney M20F, Sold
C172N, Sold
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05-02-2019, 03:29 AM
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Join Date: Oct 2010
Location: Germany
Posts: 36
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Rob Hickman, CEO of Advanced Flight Systems has an RV-4 with a Hartzell Composite prop and is very impressed with it.
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05-02-2019, 06:11 AM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Quote:
Originally Posted by TR182
Otis,
Great review and pictures!
I have an RV-4 with older non-BA Hartzell CS prop that I want to swap for something composite.
Anyone out there with the composite Hartzell on an RV-4?
My plane has a Sam James cowling which makes things a bit more difficult due to the flat front which brings the cooling inlets parallel with the cowling behind the spinner. After many emails and phone calls to WW and engineers at Hartzell I ordered the Hartzell N7605W-2X blades with extended hub today. The WW would have required a large spacer which I would rather avoid.
Now I have to sit and wait 10 weeks but look forward to formation flying and aerobatics with the new Hartzell.
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The cowl compatibility issue is partly the inlet/spinner face, but really it is the relationship of blade sweep back relative to the mounting face. This requires a different spinner than Vans. The spinner needs to have it's rear edge about 5/8" (or more) farther aft than the Vans. If not, the spinner face on the cowl must be moved forward. That is quite a bit of work.
It is my understanding the Hartzell spinner aft edge is farther back relative to the blade pivot center. If someone had kindly provided the dimensions to clearly understand this fact, I would have purchased the Hartzell spinner. The trust-me basis for the recommendation was not accepted as there was no way to verify.
Users with the SJ cowl should get the dimensions from Hartzell to be sure. (verify)
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
Last edited by BillL : 05-02-2019 at 06:14 AM.
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05-03-2019, 09:05 AM
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Join Date: Aug 2017
Location: Sebastopol,CA
Posts: 358
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Quote:
Originally Posted by BillL
The cowl compatibility issue is partly the inlet/spinner face, but really it is the relationship of blade sweep back relative to the mounting face. This requires a different spinner than Vans. The spinner needs to have it's rear edge about 5/8" (or more) farther aft than the Vans. If not, the spinner face on the cowl must be moved forward. That is quite a bit of work.
It is my understanding the Hartzell spinner aft edge is farther back relative to the blade pivot center. If someone had kindly provided the dimensions to clearly understand this fact, I would have purchased the Hartzell spinner. The trust-me basis for the recommendation was not accepted as there was no way to verify.
Users with the SJ cowl should get the dimensions from Hartzell to be sure. (verify)
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Good points and good advice! The Hartzell spinner is a work of art, and is stabilized by a precision bulkhead that slides snugly over the cylindrical prop-actuating hub, allowing for fore and aft adjustment by altering the number and position of washers at the base plate. Pricey but worth it- I would not attempt installation of this propeller without it. I only wish Hartzell would leave the final blade cutouts to the builder/installer instead of making giant cutouts with enough clearance to slide a finger through all around the blade root, which is almost perfectly cylindrical where it passes through the spinner. This huge gap is indefensible. -Otis
__________________
Otis Holt-
RV-7A (bought)
Built Monnett Moni
Frmr Test Pilot/Author CAFE APR's:
RV-8A, S-7C, Europa, Glastar.
-2019 VAF donation!!-
"RV-Fun is inversely proportional to RV-Weight!"
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12-23-2019, 10:51 AM
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Join Date: Nov 2019
Location: Ottawa, ON
Posts: 10
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I'm currently building an RV 7A that will have the angle valve IO-360-A1B6. I am still looking into what propeller would work best for acro.
I'm leaning towards the MT propeller however I don't want to have too install an extended hub due to the G limitation imposed by that configuration. Does the Hartzell Composite propeller require an extended hub? I would also like to install a shorty Sam James cowl which is the other reason I would like to avoid an extended hub if possible. Lastly how has your prop held up overtime and as the original post was in 2017?
Thanks in advance for your time.
__________________
RV-7A (Under Construction)
Tail Kit Started
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12-23-2019, 01:06 PM
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Join Date: May 2015
Location: Albuquerque NM
Posts: 10
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I installed the Hartzell composite on my Sam James equipped RV-4 and can say it is an amazing propeller as was the Hartzell customer support. The blades (N7605W-2X) can be ordered with several different length hubs so NO extensions or spacers. The ?standard? hub which works for a Vans cowling RV with metal Hartzell blades is the ?C? hub (HC-C2YR). As noted in other posts, the composite N7605W blades are wide, over 8? wide. On most RV?s the pitch range is around 12 to 34 degrees and with the Sam James cowling that just wont work with a ?C? hub (the blades will hit the cowling when at high pitch). The composite blades with the ?G? hub (on the Vans website) is 1? longer than the ?C? and is used on most RV?s that have the standard Vans cowling. For a Sam James cowling most (like mine) end up with either an ?I? hub (HC-I2YR-1NX) which is 2? longer than the ?C? hub or the ?M? which is 2.5? longer (I recall that is what an RV-7 with long Sam James used).
I highly recommend reviewing the Hartzell application guide searching for ?RV-7? to see others that have installed these propellers:
http://hartzellprop.com/services/pro...ication-guide/
And the owner?s manual which explains the hub numbering:
http://hartzellprop.com/wp-content/u...000-R19-AW.pdf
Then send a note to their customer service. I found them to be VERY helpful:
techsupport@hartzellprop.com
Mike
__________________
RV-4 Purchased, Flying
C182 TurboRG, Flying
Citabria 7GCBC, Traded
Citabria 8KCAB, Sold
Mooney M20F, Sold
C172N, Sold
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