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11-19-2019, 04:09 AM
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Join Date: Sep 2019
Location: Windsor, Ontario
Posts: 224
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WHICH HARTZELL PROPELLER MODEL?
Van's is showing both a 72" and 74" C/S prop for the RV- 14 & 14A for the 390Hp. What are the pros & cons of each option. They are both priced the same?
__________________
Glenn Martin
Windsor, Ontario
1942 Tiger Moth
2017 Waco YMF-5
Kit # 140694
Received RV-14 Empennage Kit October 22, 2019
Started Tail Cone Dec 2019
Received QB Kit April 2020
Finished a mounted Tail Surfaces to Fuselage June 2020
2020 Dues Paid
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11-19-2019, 06:12 AM
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Join Date: Sep 2018
Location: Saint Paul
Posts: 13
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RE: Which Hartzell propeller model?
Glen,
I called Hartzell a few weeks ago with the same question. They had me contact Vans. Essentially, vans stated that the 72" is for both the taildragger and the tri-gear aircraft. The 74" prop is not recommended for the taildragger RV-14. For what it's worth, I ordered the 72" prop.
I hope this helps!
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Jeffrey Turner
RV-14 N39JT reserved
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11-19-2019, 06:15 AM
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Join Date: Sep 2019
Location: Windsor, Ontario
Posts: 224
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I had heard that before but surprised to see both listed on Van?s site for the taildragger. I guess they?re concerned about prop strikes??
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Glenn Martin
Windsor, Ontario
1942 Tiger Moth
2017 Waco YMF-5
Kit # 140694
Received RV-14 Empennage Kit October 22, 2019
Started Tail Cone Dec 2019
Received QB Kit April 2020
Finished a mounted Tail Surfaces to Fuselage June 2020
2020 Dues Paid
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11-19-2019, 06:29 AM
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Join Date: Dec 2012
Location: Princeton, New Jersey
Posts: 18
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When only considering an RV14-A (which can use either it seems), any thoughts on pros and cons on choosing one over the other?
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Julio Herrera
Model: RV14a (Working on Tail Kit) (QB Fuselage, QB Wings and Finishing Kit arrived)
Kit #140208
N99JH (Reserved)
Home Base: 39N (Princeton)
Dues paid: Nov 2019
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11-20-2019, 12:51 PM
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Join Date: Jan 2005
Location: Clermont, FL
Posts: 565
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Quote:
Originally Posted by Shado
When only considering an RV14-A (which can use either it seems), any thoughts on pros and cons on choosing one over the other?
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All else being equal, at any given RPM, greater blade length will yield greater thrust. I chose the 74" version for my -14A.
FWIW, when I spoke to Mike Seager back in September, he agreed that the 74" Hartzell is the best-performing prop for the -14A.
__________________
Ken
RV-8 N118KB (#81125) - Sold
RV-14A N114KB (#140494) - Sold
RV-14A.com
N114KB Build Site
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11-20-2019, 01:49 PM
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Join Date: Sep 2019
Location: Windsor, Ontario
Posts: 224
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Why not put in on the 14 then? Is 1" less ground clearance really going to be a factor?
__________________
Glenn Martin
Windsor, Ontario
1942 Tiger Moth
2017 Waco YMF-5
Kit # 140694
Received RV-14 Empennage Kit October 22, 2019
Started Tail Cone Dec 2019
Received QB Kit April 2020
Finished a mounted Tail Surfaces to Fuselage June 2020
2020 Dues Paid
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11-20-2019, 01:59 PM
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Join Date: Jan 2005
Location: Clermont, FL
Posts: 565
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Quote:
Originally Posted by Jetmart
Why not put in on the 14 then? Is 1" less ground clearance really going to be a factor?
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Apparently so. With the -14's tail up on takeoff, it won't take much over rotation to place the prop disc in closer proximity to the ground than the -14A's in its normal three-point attitude. Not to mention the tailwheel version's entirely different main gear legs, the springiness/compressibility of which (on, say, a poorly executed wheel landing) might also bring the longer prop closer to the ground than desired.
__________________
Ken
RV-8 N118KB (#81125) - Sold
RV-14A N114KB (#140494) - Sold
RV-14A.com
N114KB Build Site
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11-20-2019, 05:19 PM
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Join Date: Mar 2016
Location: Willis Gliderport
Posts: 185
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This topic has been covered in the past here on V A. Basically, prop length was reduce for the 14 to satisfy the drop test ground clearance requirements, I believe.
I learned this after I received my 72? prop (14) and was a little pissed. I would have preferred the 74?. I asked Hartzell if I could exchanged my unopened 72? prop and they said once shipped it is considered used.
I advise, if you are a good pilot and feel you will not crash land or over rotate
by an insane amount, go with the 74?. If you are a below average, have a tendency to lose control, wear a watch over 1 lb, and get lost on cross country flights.....go with the 72?.
R
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11-20-2019, 08:34 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by Discus2b
This topic has been covered in the past here on V A. Basically, prop length was reduce for the 14 to satisfy the drop test ground clearance requirements, I believe.
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This is the correct answer.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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11-21-2019, 04:13 PM
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Join Date: Aug 2016
Location: West Chester, PA
Posts: 119
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Went with the...
72? on my RV-14. As strongly recommended by Vans. I have no way to know what difference another inch of radius would make, but I am completely happy with how it performs. 101 hours now....
__________________
RV-14 Built
Can?t believe I built an airplane!
First flight October 22, 2018
N1477M
Kit #140329
If I had a nickel for every time I didn?t know what was going on, I?d be, like, ?Why am I always getting all these nickels??
Ka-CHING
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