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  #1  
Old 11-19-2019, 04:09 AM
Jetmart Jetmart is offline
 
Join Date: Sep 2019
Location: Windsor, Ontario
Posts: 224
Default 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?
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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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  #2  
Old 11-19-2019, 06:12 AM
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jeffreyuh60 jeffreyuh60 is offline
 
Join Date: Sep 2018
Location: Saint Paul
Posts: 13
Default 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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RV-14 N39JT reserved
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  #3  
Old 11-19-2019, 06:15 AM
Jetmart Jetmart is offline
 
Join Date: Sep 2019
Location: Windsor, Ontario
Posts: 224
Default

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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  #4  
Old 11-19-2019, 06:29 AM
Shado Shado is offline
 
Join Date: Dec 2012
Location: Princeton, New Jersey
Posts: 18
Default

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
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  #5  
Old 11-20-2019, 12:51 PM
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kbalch kbalch is offline
 
Join Date: Jan 2005
Location: Clermont, FL
Posts: 565
Default

Quote:
Originally Posted by Shado View Post
When only considering an RV14-A (which can use either it seems), any thoughts on pros and cons on choosing one over the other?
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.
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RV-8 N118KB (#81125) - Sold
RV-14A N114KB (#140494) - Sold

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  #6  
Old 11-20-2019, 01:49 PM
Jetmart Jetmart is offline
 
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Location: Windsor, Ontario
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Default

Why not put in on the 14 then? Is 1" less ground clearance really going to be a factor?
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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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  #7  
Old 11-20-2019, 01:59 PM
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kbalch kbalch is offline
 
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Location: Clermont, FL
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Quote:
Originally Posted by Jetmart View Post
Why not put in on the 14 then? Is 1" less ground clearance really going to be a factor?
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.
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RV-8 N118KB (#81125) - Sold
RV-14A N114KB (#140494) - Sold

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N114KB Build Site
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  #8  
Old 11-20-2019, 05:19 PM
Discus2b Discus2b is offline
 
Join Date: Mar 2016
Location: Willis Gliderport
Posts: 185
Default

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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  #9  
Old 11-20-2019, 08:34 PM
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rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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Default

Quote:
Originally Posted by Discus2b View Post
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.
This is the correct answer.
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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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  #10  
Old 11-21-2019, 04:13 PM
Don E Don E is offline
 
Join Date: Aug 2016
Location: West Chester, PA
Posts: 119
Default 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....
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Can?t believe I built an airplane!
First flight October 22, 2018
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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??
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