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03-01-2012, 09:44 AM
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Prop
C/S use is not a big deal. Look at all the extra knobs and switches people add to their airplanes with the EFIS systems they install.
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03-01-2012, 09:48 AM
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Join Date: Sep 2010
Location: Redlands, Ca.
Posts: 1,458
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C/S or F/P
Quote:
Originally Posted by Flyguytki
Again personal preference, I would rather have a manual transmission over automatic any day. But that right theres proves the point. It all what you want, if you want simple, you cant get much more simple than one lever for power, push forward go fast pull back slow down.
-david
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Manual verses automatic isn't an accurate comparison. A far more accurate comparison would be a high tech constant velocity, infinitely adjustable automatic transmission verses a manual trans that is stuck in one gear for life. Allan 
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Allan Nimmo
AntiSplatAero.com
Innovative Aircraft Safety
Products, Tools & ServicesInfo@AntiSplatAero.com Southern California (KREI)
RV-9A / Edge-540 
(909) 824-1020
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03-01-2012, 10:45 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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I've heard this ONE too many times!
Quote:
Originally Posted by PerfTech
Manual verses automatic isn't an accurate comparison. A far more accurate comparison would be a high tech constant velocity, infinitely adjustable automatic transmission verses a manual trans that is stuck in one gear for life. Allan 
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Comparing a fixed pitch prop to a manual transmission stuck in one gear is also not an accurate comparison.
If that were "apples-to-apples", there would be many cars running around with a "one-gear" transmission. Only place I've seen this is on the drag-strip.
There are MANY airplanes flying just fine with F/P props.
When is the last time you saw a car on the road with a one-gear transmission?
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
Last edited by Mel : 03-01-2012 at 10:54 AM.
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03-01-2012, 11:47 AM
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Join Date: May 2009
Location: KS
Posts: 110
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Does this count?
Quote:
Originally Posted by Mel
When is the last time you saw a car on the road with a one-gear transmission?
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It has a fixed pitch prop.

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RV-7
In progress...
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03-01-2012, 12:38 PM
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aerocar
Yes it does. And it's neither a good car or a good airplane.
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03-01-2012, 01:03 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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DO YOUR RESEARCH GUYS!
This car did NOT drive on the road with a single speed transmission!
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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03-01-2012, 01:38 PM
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Join Date: May 2009
Location: KS
Posts: 110
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No, but it drove on the road with a fixed-pitch prop. I thought these were one in the same.
It had a 3-speed on the floor for driving the wheels. That's just like having a constant speed prop. 
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RV-7
In progress...
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03-01-2012, 01:49 PM
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Join Date: Nov 2008
Location: McMinnville, Oregon: HOME of the SPRUCE GOOSE
Posts: 540
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Car Transmission analogy.
Mel is correct. The car trans analogy is flawed in showing a comparison between a F/P vs. C/S.
Fixed pitch: $ lower entry price; low maintenance; no mechanical rebuild needed; lighter weight; no loss in top speed.
Constant speed prop does have the advantage of helping to move the CG forward for a more usable useful load, depending on mission. Also C/S has the advantages of a climb prop at slower airspeeds, therefore allowing shorter takeoffs and climb capability.
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Tailwinds...
Simplicity is the ultimate sophistication.
Leonardo Da Vinci
Working on a RV-4
Citabria 7GCBC
Cessna 180
RV7 I0-360 C/S, Slider, AP, Glass, etc. sold.
RV6 O-320 F/P, Slider, AP, Steam, etc., sold
Citabria 7KCAB rental
Piper Cherokee, sold
Sparrowhawk, sold
Proud -VAF- Supporter - Exempt, Dues Paid Anyway.
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03-01-2012, 01:51 PM
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Forum Peruser
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Join Date: Jan 2005
Location: Austinville, Alabama
Posts: 2,458
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Air is a Compressible Fluid
You guys are off in Never-Never Land.
There's LOTS of difference between turning a propeller (either CS or FP) in a compressible fluid and driving a tire on a paved road.
(Different way of saying that Mel is right again.)
Reminds me of a debate by a buddy who challenged a so-called expert on model airplane propellers after the "s-c e" wrote an article in the AMA (Academy of Model Aeronautics) magazine.
Put your thinking caps on. 
__________________
Don Hull
RV-7 Wings
KDCU Pryor Field
Pilots'n Paws Pilot
N79599/ADS-B In and Out...and I like it!
?Certainly, travel is more than the seeing of sights;
it is a change that goes on, deep and permanent, in the ideas of living." Miriam Beard
Last edited by rv7boy : 03-01-2012 at 02:40 PM.
Reason: Added the "Mel" parenthesis.
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03-01-2012, 02:34 PM
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Join Date: Jul 2007
Location: Warwickshire UK
Posts: 703
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Where I work, we're building a car with a single gear fixed transmission and no clutch.
The trick is to use an electric motor that produces 100% torque at 0 RPM  
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