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10-14-2008, 04:28 AM
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Join Date: Jan 2005
Location: Ottawa, Canada
Posts: 2,357
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Quote:
Originally Posted by N941WR
Unless you use a composite (wood) prop. My Catto is 9 lbs vs. 40 lbs for a metal FP prop.
The numbers presented on the Van's web site are a good tell. The RV-9 numbers are all for FP prop whereas the RV-7 numbers are all for CS props.
The GW climb for a FP O-320 RV-9 is 1400 FPM and the GW climb for a CS O-320 RV-7 is 1400 FPM. (1650 FPM / 180 HP & 1900 FPM / 200 HP)
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If you use the data from Van's web site as a comparison, don't forget that not only is the prop different, the wing is different too. If everything else is equal, an aircraft with longer wing span will have a higher climb rate than one with shorter wing span. So, an RV-9 should be able to out climb an RV-7, if both had the same engine and prop.
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10-14-2008, 05:47 AM
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Join Date: Oct 2007
Location: Jackson, MS
Posts: 1,262
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Look in mirror
My recommendation, take a good hard look in the mirror. I know that I need to lose 25 pounds (and I'm working on it - heading to the gym this morning). Your heart will appreciate you and you have a better chance of keeping your medical. You might even live longer!!
For the fit folks, you have to put your plane on the diet.
__________________
Webb Willmott
Jackson, MS
N32WW
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10-14-2008, 09:56 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Weight control...
This was posted on Van's first flight list:
Quote:
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Originally Posted by Van's
From: Kevin McCormick
To: webmaster@vansaircraft.com
Subject: First Flight
Date sent: Mon, 6 Oct 2008
Serial # 23648 RV-6
After 12 Years 10 months and 23 days my plane finally made its first flight on September 25th 2008.
Empty weight is 944#
Engine 150 HP O320
Wood Prop
Simple steam gauges purchased from Van’s
Normal flight instruments
Manual flaps
ICOM portable radio panel mounted
My goal was to keep it simple and light. It flies like the RV7 I flew when I took my transition training with Mike. I really don’t have anyone to thank, the entire plane was completed by me, every rivet. My wife has never been supportive and still is not. My children were too young when I started and have never had any interest in it.
I do want to thank everyone at Van’s aircraft for the support during the construction.

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944 pounds! We all have something to learn from Mr. McCormick!
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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10-14-2008, 05:34 PM
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Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,218
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Quote:
Originally Posted by N941WR
This was posted on Van's first flight list:
944 pounds! We all have something to learn from Mr. McCormick!
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If that weight includes all the fairings, paint, and a decent set of cushions in both seat, that is an impressively light aircraft. Looking at my 1030 pound, 0-320, wood prop, Piper Cub paneled RV-6, I just don't see any way to get 85 lbs out of my aircraft to match that one. 50, maybe, but 85? Wow.
Estimating the "extra weight" in my airplane and what could be saved by a more weight conscious person:
Carpet 8 lbs.
Too-heavy primer 10 lbs
Too-heavy paint 10 lbs.
Thick cushions 10 lbs.
Heavy starter 8 lbs
Total: 46 lbs.
Subtracting that from my airplane's weight results in 985 lbs. Where does that other 40 lbs of savings come from?
__________________
Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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10-14-2008, 05:57 PM
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Join Date: Jan 2008
Location: Wellington, New Zealand
Posts: 97
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Quote:
Originally Posted by N941WR
This was posted on Van's first flight list:
944 pounds! We all have something to learn from Mr. McCormick!
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Reading the rest of his post, I'd say we all have A LOT to learn from Mr McCormick about perseverance. He built it right, took almost 13 years to first flight, and did it without family support. That's hard yards right there.
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10-15-2008, 11:33 AM
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Join Date: Sep 2008
Location: Christchurch, New Zealand
Posts: 187
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944 pounds, very impressed!
It seems to me from the posts here weight control (for the aeroplane at least!), is all about the basics, a minimum of gadgets on the panel, prop choice, starter/ alternator options, paint and comfort items inside. Thanks for all your replies to my question, and if anybody has anything else to add I look forward to it.
Craig
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10-15-2008, 05:45 PM
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Join Date: May 2005
Location: Mandeville, Louisiana
Posts: 179
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Catto and Acro
Quote:
Originally Posted by N941WR
Unless you use a composite (wood) prop.
Other than doing acro or formation work, I have to wonder if the CS prop is worth the cost, maintenance, and weight.
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I think the lighter weight prop enhances the feel of an RV-6 and is great for Acro.
__________________
Dale Lambert
RV-6 Flying, XPIO360 Catto 3bld AFS3500EE
'68' C177
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