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04-19-2017, 09:11 AM
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Join Date: Sep 2015
Location: Marion, IN
Posts: 231
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Weight difference: alum vs comp props
Planning on using the Hartzell blended airfoil 74" aluminum prop on my -14. However, I would like to consider a composite prop but want to make sure that I don't create a CG problem. Where can can I find the weights of the aluminum Hartzell and the Whirlwind and Hartzell composite props? I'm planning on moving the ELT to just behind the aft baggage bulkhead but not sure how much more I'd have to move (or what) to maintain the same CG. I seriously doubt the ELT move will come close to matching the CG shift caused by the prop change.
__________________
Ray Dosh
LJ45 driver
RV-14 QB #140212
Tail feathers finished
Tail cone in progress
2020 DUES PAID
Marion, IN MZZ
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04-19-2017, 09:14 AM
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Join Date: Aug 2015
Location: Leesburg, VA
Posts: 492
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I think the aluminum Hartzell vs the Whirlwind is something like 55 vs 42 lbs. I know there are a few 14s out there already flying with the composite Hartzell and Whirlwind props.
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04-21-2017, 09:08 PM
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Join Date: Apr 2017
Location: Aiken, SC
Posts: 2
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Props
We love our Hartzell composite prop, and I have flown many other ones before we decided on it. It is very smooth, the climb is fantastic and the CG could not have worked out any better if we planned it. The spinner that you need for it is beautiful, long and sleek. The only downside I can think of is the cost. You get what you pay for. Buy it, you will be pleased. Good Luck
__________________
Carl W. Bell
www.rv14a.com
RV 14A N947RV
Repeat Offender
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04-22-2017, 07:09 AM
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Join Date: Dec 2009
Location: St Louis, MO
Posts: 957
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Prop weights
Ray,
I have been exchanging e-mails with Matt Van Voorhis at Hartzell about prop weights. Here is some info I received recently from him in an e-mail:
"The most common 2 blade blended airfoil prop is the F7497 blade model. That propeller weighs about 58 pounds. The most common Van's composite propeller would be either the N7605 blade or the NC8301 blade. Those propellers weigh 43 and 41 pounds respectively."
Matt's e-mail is: mvanvoorhis@hartzellprop.com
__________________
RV-8, Flying
Previous airplanes: Corby Starlet, Citabria, Cessna 140, Vari-Viggen, RV-3, RV-4
RV grin every flight
"Sure is nice to have smart friends"
2018 dues paid
Last edited by olyolson : 04-22-2017 at 07:12 AM.
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04-22-2017, 07:27 AM
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Join Date: Sep 2015
Location: Marion, IN
Posts: 231
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Carl, Oly, thanks for the information. Very useful in my planning.
Carl, you mentioned the spinner. I found it curious that the second-hand QB kit that I bought included a spinner but I didn't ask about it. I would have presumed that would have come with the firewall forward kit. I only have empennage, wings and tail. Did you buy your spinner from Hartzell?
__________________
Ray Dosh
LJ45 driver
RV-14 QB #140212
Tail feathers finished
Tail cone in progress
2020 DUES PAID
Marion, IN MZZ
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04-22-2017, 09:48 AM
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Join Date: Jan 2005
Location: NC25
Posts: 3,507
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Quote:
Originally Posted by olyolson
Ray,
I have been exchanging e-mails with Matt Van Voorhis at Hartzell about prop weights. Here is some info I received recently from him in an e-mail:
"The most common 2 blade blended airfoil prop is the F7497 blade model. That propeller weighs about 58 pounds. The most common Van's composite propeller would be either the N7605 blade or the NC8301 blade. Those propellers weigh 43 and 41 pounds respectively."
Matt's e-mail is: mvanvoorhis@hartzellprop.com
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What concerns me other than PRICE on the Hartzell composite prop is that Van's website says " Extended hub composite 2-blade".
It they mean extended hub like the old Twin Comanche, that would be a deal breaker for me. If it is the hub that works on Van's standard cowl, then that works for me.
__________________
Gary A. Sobek
NC25 RV-6 Flying
3,400+ hours
Where is N157GS
Building RV-8 S/N: 80012
To most people, the sky is the limit.
To those who love aviation, the sky is home.
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04-22-2017, 10:37 AM
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Join Date: May 2005
Location: Rescue, CA. KROB
Posts: 352
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Carl, on your great website you have your w&b posted prior to paint. Any chance you can update us on what you paint job has done to the cg and weight of your plane?
Thanks
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Rob Lasater
Rv-14 flying baby, yeah.
Paid Dec 2019
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04-22-2017, 11:04 AM
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Join Date: Sep 2015
Location: Marion, IN
Posts: 231
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Quote:
Originally Posted by RV6_flyer
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Thanks for pointing that out, Gary. Definitely needs to be checked out.
__________________
Ray Dosh
LJ45 driver
RV-14 QB #140212
Tail feathers finished
Tail cone in progress
2020 DUES PAID
Marion, IN MZZ
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04-22-2017, 11:41 AM
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Join Date: Jan 2005
Location: NC25
Posts: 3,507
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Quote:
Originally Posted by SabreFlyr
Thanks for pointing that out, Gary. Definitely needs to be checked out.
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Ray:
I did email Matt to ask about the extended hub. Will report back if I learn anything.
It appears that the hub listed on Van's website has the same Type Certificate Data Sheet. P-920.
The confusing part is that C in the hub model: "Identifies basic design ? C denotes no integral shaft extension" on the above linked TCDS.
That is why I emailed Matt to learn more.
__________________
Gary A. Sobek
NC25 RV-6 Flying
3,400+ hours
Where is N157GS
Building RV-8 S/N: 80012
To most people, the sky is the limit.
To those who love aviation, the sky is home.
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04-22-2017, 02:29 PM
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Join Date: Jul 2015
Location: Aiken, SC
Posts: 620
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I am currently planning to follow Carl and Rafael's lead with the Hartzell composite prop. What is the concern about the extended shaft? Doesn't a Twin Oomanche have O-320 engines?
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