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  #1  
Old 07-23-2012, 03:09 PM
hevansrv7a's Avatar
hevansrv7a hevansrv7a is offline
 
Join Date: Jul 2005
Location: Detroit, MI
Posts: 1,632
Exclamation My new prop from NZ

It can finally be made public.

I bought the first prop designed by John McGinnis (Synergy aircraft). It is being made by a new New Zealand company that can be found at:
www.kiwipropellers.com
It is designed for my 7A.
If you are here at OSH, the NZ compound is directly west of the Honda Jet tent a short ways north of show central. there are 3 prototypes there.
On the map as #406.

I am bringing the guys from the OSH NZ exhibit to the social at the beer tent tonight. Doug: come find us and they will probably buy an ad from you. Look for the white ball caps with green logo.

When I have flown the prop I will do my usual, honest, objective write-up
__________________
H. Evan's RV-7A N17HH sold at 268+ hours
Bought N512RV (RV-12)
"
We can lift ourselves out of ignorance, we can find ourselves as creatures of excellence and intelligence and skill. We can be free! We can learn to fly!" -J.L. Seagull
Paid $25.00 "dues" 2021.

my website

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  #2  
Old 07-24-2012, 05:17 PM
Dragonfly Dragonfly is offline
 
Join Date: Jul 2009
Location: New Zealand
Posts: 60
Default

Very interested to hear how you get on. Good to see NZ products popping up on the aviation scene.
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  #3  
Old 08-03-2012, 09:32 AM
hevansrv7a's Avatar
hevansrv7a hevansrv7a is offline
 
Join Date: Jul 2005
Location: Detroit, MI
Posts: 1,632
Default Update

The prop is on its way back to Kiwi-land (New Zealand) for a couple of reasons:

1. It will probably be changed so that it can be installed on my RV without a new extension. It's an issue of part of the blades being aft of the base of the hub in the current version.


2. John, the Mitchells and I all agreed on a good ground-testing plan which will precede putting it on my airplane.


The prop was a big hit at the show and many people expressed interest in having one designed for their airplanes - some of which are not RV's. But that is O.T.


Here are some things that I learned about it:
  • constant Reynolds number
  • 25 custom NLF airfoils blended, all by Synergy designer John McGinnis
  • some L/D ratios on some of the airfoils that are so high I won't say them out loud, here.
  • lift distribution more parabolic than elliptical
  • makes good use of the "q" near the hub
  • twist is less than "normal" because the necessary advance ratio is accomplished with airfoil design.
  • The airfoils adapt in thickness, camber, and design Mach number as they move outward. Keeping the Reynolds number constant prevents unnoticed lift/drag changes as those factors are varied in pursuit of the desired lift distribution.
  • all composite construction - no wood
  • I have not seen it yet but there will be a custom spinner with it
And, yes, the Kiwi's have begun the process of becoming advertisers on this forum. I put them in touch with Doug even though we missed him at the beer tent (where I was told he was not present).

One more thing: a few people tried to compare it to a Paul Lipps prop. I mean no disrespect to the late Mr. Lipps, but, no, that's not even close.
__________________
H. Evan's RV-7A N17HH sold at 268+ hours
Bought N512RV (RV-12)
"
We can lift ourselves out of ignorance, we can find ourselves as creatures of excellence and intelligence and skill. We can be free! We can learn to fly!" -J.L. Seagull
Paid $25.00 "dues" 2021.

my website


Last edited by hevansrv7a : 08-03-2012 at 04:38 PM. Reason: added language to prop design features from the designer
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  #4  
Old 08-05-2012, 05:32 AM
sonex293 sonex293 is offline
 
Join Date: Jan 2005
Location: North Carolina
Posts: 163
Default

Thanks for the update. Always curious about new propellers....

--
Michael
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  #5  
Old 08-17-2013, 09:53 PM
hohocc hohocc is offline
 
Join Date: Sep 2008
Location: Christchurch, New Zealand
Posts: 189
Default

Just noticed the Kiwipropellors website has been suspended.
Does anybody have any more positive news about them?
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  #6  
Old 08-18-2013, 10:19 AM
hevansrv7a's Avatar
hevansrv7a hevansrv7a is offline
 
Join Date: Jul 2005
Location: Detroit, MI
Posts: 1,632
Default Kiwi Props

I have not given an update because I have not had anything concrete to say. However, the prop that John McGinnis designed has been redesigned and John tells me that there will be a production version but he did not say when.

The Kiwi folks may come back into it later, but I expect that the first production versions of John's new prop design will be produced in north America.

I still expect to put that prop on my 7A and see what it does. In the meantime I am refining some of my test techniques because I found some deficiencies in them. I will put out an article on that when I have completed the revision.

If things work as I expect, the revised testing and analysis stuff for my airplane will come first and then there will be a write-up on the new prop with the new techniques and analysis.

Sorry for the lack of really specific information. More to come.
__________________
H. Evan's RV-7A N17HH sold at 268+ hours
Bought N512RV (RV-12)
"
We can lift ourselves out of ignorance, we can find ourselves as creatures of excellence and intelligence and skill. We can be free! We can learn to fly!" -J.L. Seagull
Paid $25.00 "dues" 2021.

my website

Reply With Quote
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