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dpremgood(at)aim.com
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 Posted: Fri Apr 11, 2008 7:44 am Post subject: CGS Prop blades Loose |
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Good day all,
Just before the posts on the GSC prop blades, I took my 2 blade GSC off
my J3 Kitten. I wanted to buy a third blade in order to hang a 3 blade
prop. (I already have the 3 blade hub).
The folks at GCS offered to inspect my 2 blades and build the 3rd blade
to balance with the other 2.
Their inspection of my 2 blades showed that the blades were over
torqued in the past. ( I bought this plane used) They were right since
there was no gap between the hub halves.
GSC offered to return my blades, but recommended that I get new ones
because the blade's fibres at the roots were probably crushed and
therefore weakened.
I was a little disappointed that I would need a new prop, but safety
does come at a price.
Speaking of price, the good folks at GSC offered me a substantial
discount on 3 new blades, so now I am a proud new owner of a 3 blade
GSC prop for my J3 Kitten.
BTW, my Kitfox Classic IV is still in progress, I am building the spray
booth in my garage and will start painting when the weather is warmer.
Also, I am still looking for a prop. (ROTAX 912)
Any suggestions?
Doug Remoundos
Montreal, Canada
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peteohms
Joined: 31 Oct 2007
Posts: 224
Location: Leander, TX
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| Posted: Fri Apr 11, 2008 10:03 am Post subject: CGS Prop blades Loose |
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I like the looks of a 2 blade wood prop. Isn't a 2 blade more efficient?
Pete
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Pete
Leander, TX
Kitfox III, 912ul, Grove |
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propellerdesign(at)tele2.
Guest
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| Posted: Fri Apr 11, 2008 10:46 am Post subject: CGS Prop blades Loose |
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No not necessarily.
If you need 3 blade that is better, a 2 blade will be larger in diameter or
chord, higher tip speed and lower aspect ratio isn't always better.
Look is one thing, vibes is other, and ground clearance.
Jan
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ElleryWeld(at)aol.com
Guest
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| Posted: Fri Apr 11, 2008 5:05 pm Post subject: CGS Prop blades Loose |
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I find the 2 blade prop is more efficient but the next guy will say that three is better its your own preference
Ellery in Maine
do not archive
In a message dated 4/11/2008 2:04:49 P.M. Eastern Daylight Time, apeterchristensen(at)sbcglobal.net writes:
[quote]--> Kitfox-List message posted by: "Pete Christensen" <apeterchristensen(at)sbcglobal.net>
I like the looks of a 2 blade wood prop. Isn't a 2 blade more efficient?
Pete
----- Original Message -----
From: <dpremgood(at)aim.com>
To: <kitfox-list(at)matronics.com>
Sent: Friday, April 11, 2008 9:40 AM
Subject: RE: CGS Prop blades Loose
[quote] --> Kitfox-List message posted by: dpremgood(at)aim.com
Good day all,
Just before the posts on the GSC prop blades, I took my 2 blade GSC off
my J3 Kitten. I wanted to buy a third blade in order to hang a 3 blade
prop. (I already have the 3 blade hub).
The folks at GCS offered to inspect my 2 blades and build the 3rd blade
to balance with the other 2.
Their inspection of my 2 blades showed that the blades were over
torqued in the past. ( I bought this plane used) They were right since
there was no gap between the hub halves.
GSC offered to return my blades, but recommended that I get new ones
because the blade's fibres at the roots were probably crushed and
therefore weakened.
I was a little disappointed that I would need a new prop, but safety
does come at a price.
Speaking of price, the good folks at GSC offered me a substantial
discount on 3 new blades, so now I am a proud new owner of a 3 blade
GSC prop for my J3 Kitten.
BTW, my Kitfox Classic IV is still in progress, I am building the spray
booth in my garage and will start painting when the weather is warmer.
Also, I am still looking for a prop. (ROTAX 912)
Any suggestions?
Doug Remoundos
Montreal, Canada
--
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http://www.matronics.com/Navigator?Kitfox-List |
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Fri Apr 11, 2008 7:13 pm Post subject: CGS Prop blades Loose |
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Most efficient is a single blade... Very few of those out there. They are
mostly used on motor sailplanes which have retractable engines of limited
power. I agree that a nice carved laminated wood prop is a thing of beauty!
Noel
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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Tom Jones
Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA
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| Posted: Fri Apr 11, 2008 7:41 pm Post subject: Re: CGS Prop blades Loose |
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My experience with a 68 inch three blade GSC versus a 72 inch two blade Warp on a 503, with a 3:1 C reduction box on a Classic 4 is the three blade was smoother...the two blade better climb and faster cruise.
I need every ounce of thrust I can get from the 503 so for me the two blade is the prop of choice.
| | - The Matronics Kitfox-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA |
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dpremgood(at)aim.com
Guest
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| Posted: Sat Apr 12, 2008 4:24 am Post subject: CGS Prop blades Loose |
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Tom,
That's very interesting.
I fly a J3 Kitten with a 503 B gearbox, 2.58 :1
My biggest concern is ground clearance... the 72 inch just wouldn't be
possible for me.
How does the prop inertia compare between the Warp and the GSC?
Doug
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Tom Jones
Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA
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| Posted: Sat Apr 12, 2008 6:37 am Post subject: Re: CGS Prop blades Loose |
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| dpremgood(at)aim.com wrote: | Tom,
That's very interesting.
I fly a J3 Kitten with a 503 B gearbox, 2.58 :1
My biggest concern is ground clearance... the 72 inch just wouldn't be
possible for me.
How does the prop inertia compare between the Warp and the GSC?
Doug
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Doug, I don't know the specific inertia numbers for the props. The three blade GSC came with the engine when I bought it from Skystar in 1994. later I wanted to maximize the performance so called Warp and told them the application.
The Warp guy discussed some other props with me until I mentioned the gear box was a 3:1 C then he immediately said the 72 inch two blade was the way to maximize performance for that little engine. The sturdiness of the gear box along with the gear reduction was the Key I think.
My kitfox is draggy. No fairing on the wing struts. Cruise speed is slow...75 MPH at 5800 RPM with the WARP, about 70 with the GSC.
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_________________
Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA |
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