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  #11  
Old 07-17-2021, 03:01 PM
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Av8rRob Av8rRob is offline
 
Join Date: May 2005
Location: Rescue, CA. KROB
Posts: 396
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Quote:
Originally Posted by Mark33 View Post
So why the 72” on the -14 (taildragger)? I know the 72” is recommended for the -7, but I think the -14 sits up taller than the -7. I may be selling my -7 Q.B. kit and switching over to the -14, so this subject is of interest to me. I already have the 72” and it’d be nice if in fact it’s a good choice for the -14. That’d keep me from having to sell my 72” and then having to buy the 74”. So us there no real performance differences in the two props?
I have the 74” on my -14 and measured tip to ground clearance at 13” in level attitude
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  #12  
Old 07-17-2021, 05:31 PM
Don E Don E is offline
 
Join Date: Aug 2016
Location: West Chester, PA
Posts: 133
Default Drop test

Quote:
Originally Posted by Mark33 View Post
So why the 72” on the -14 (taildragger)? I know the 72” is recommended for the -7, but I think the -14 sits up taller than the -7. I may be selling my -7 Q.B. kit and switching over to the -14, so this subject is of interest to me. I already have the 72” and it’d be nice if in fact it’s a good choice for the -14. That’d keep me from having to sell my 72” and then having to buy the 74”. So us there no real performance differences in the two props?

I spoke with both Vans and Hartzell about this before ordering my prop. While the ground clearance may seem more than adequate, the issue was ground clearance and the drop test done by Vans, video on their website. For me, one more inch of blade on each side wasn’t worth ignoring strong advice from both parties. And they couldn’t tell me then (four years ago) what if any difference there would be in performance. Maybe they can tell you now.
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  #13  
Old 07-18-2021, 07:30 AM
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Mark33 Mark33 is offline
 
Join Date: May 2010
Location: Baton Rouge, La.
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Quote:
Originally Posted by Av8rRob View Post
I have the 74” on my -14 and measured tip to ground clearance at 13” in level attitude
Good information….thanks!
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Mark H.
RV-7- IO-360, EFII, Whirl Wind C/S, (Built and sold)
RV-4- O-320, Catto three blade, P-Mags (Sold)
RV-8- IO-360, Hartzell C/S (Flying)
RV-7- (Building)
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  #14  
Old 07-18-2021, 07:33 AM
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Mark33 Mark33 is offline
 
Join Date: May 2010
Location: Baton Rouge, La.
Posts: 757
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Quote:
Originally Posted by Don E View Post
I spoke with both Vans and Hartzell about this before ordering my prop. While the ground clearance may seem more than adequate, the issue was ground clearance and the drop test done by Vans, video on their website. For me, one more inch of blade on each side wasn’t worth ignoring strong advice from both parties. And they couldn’t tell me then (four years ago) what if any difference there would be in performance. Maybe they can tell you now.
I’ll contact Vans to see if they have any updated information/recommendations. Thanks!
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RV-7- IO-360, EFII, Whirl Wind C/S, (Built and sold)
RV-4- O-320, Catto three blade, P-Mags (Sold)
RV-8- IO-360, Hartzell C/S (Flying)
RV-7- (Building)
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  #15  
Old 07-18-2021, 10:20 AM
dmattmul dmattmul is offline
 
Join Date: Dec 2015
Location: Spring Hill, FL
Posts: 183
Default Getting the cowling on/off

I have a WhirlWind 3 blade on my 14 and the performance seems close or better than the data I've seen with the 2 blade. This is only my opinion. What I can see and the point of writing this is getting the lower cowling (I assume that is what builders think could be an issue) on or off is very easy even with one person. What does help is I have the Anti-Splat fairing guard that I can use to slide the cowling up or down the fairing. I think even if I had a 2 blade I would use this.
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RV-14A QB building, Lycoming 390 Thunderbolt arrived July 2019, Garmin avionics, Vertical Power, EFII-32 Ignition and Fuel, Whirlwind 300-72, Parts became a real airplane 8/15/2020.
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  #16  
Old 08-12-2021, 02:39 PM
ben barron ben barron is offline
 
Join Date: Sep 2013
Location: Fall City, WA
Posts: 161
Default 3 blade prop & anti splat

Would you send a picture of this "anti splat" devise?
Is anyone using a Catto 3 blade?
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  #17  
Old 08-12-2021, 03:47 PM
DanNiendorff DanNiendorff is offline
 
Join Date: May 2019
Location: Knoxville, TN
Posts: 90
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Quote:
Originally Posted by Walt View Post
There's no dressing out big dings or cutting down the tip on a composite blade.
Actually the composite props are surprisingly repairable. The details of what can and can't be done are outlined in Hartzell manual 170, and they have a few videos to demonstrate also. Much easier than one might think.

Cutting down the tips? Don't think I would try that one....
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  #18  
Old 08-12-2021, 09:51 PM
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czechsix czechsix is offline
 
Join Date: Mar 2006
Location: Spring Hill, KS
Posts: 388
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Quote:
Originally Posted by KatanaPilot View Post
If around 100 pounds of additional static thrust qualifies as "no performance gain", then your position might be valid. In my experience, the Hartzell composite prop is awesome for getting off the runway and is really nice in formation flying too.
Can you point me to the performance data that demonstrated a 100 lb increase in static thrust for the composite vs. metal Hartzell prop? Is this for a two or three blade Hartzell?
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  #19  
Old 08-16-2021, 09:05 PM
USN bullet USN bullet is offline
 
Join Date: Nov 2018
Location: Cody
Posts: 10
Default Hartzell composite Props

Our local FBO services Cirrus and I'm told that Cirrus uses Hartzell composite on their ships. Lots of data on that prop, and it's the same one recommended for the RV-14A
Cheers
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  #20  
Old 08-17-2021, 01:07 PM
StressedOut StressedOut is offline
 
Join Date: Jun 2017
Location: Fullerton, CA
Posts: 161
Default

I have read (with no supporting proof, to be fair) that the 3-bladed prop mated with the EXP engine is considerably smoother. Can anyone with actual experience with either the MT or Hartzell version chime in on this issue?
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