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  #51  
Old 03-01-2012, 09:44 AM
paul mosher
 
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Default 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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  #52  
Old 03-01-2012, 09:48 AM
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Default C/S or F/P

Quote:
Originally Posted by Flyguytki View Post
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
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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  #53  
Old 03-01-2012, 10:45 AM
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Default I've heard this ONE too many times!

Quote:
Originally Posted by PerfTech View Post
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
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?
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Last edited by Mel : 03-01-2012 at 10:54 AM.
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  #54  
Old 03-01-2012, 11:47 AM
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LeeM_2000 LeeM_2000 is offline
 
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Talking Does this count?

Quote:
Originally Posted by Mel View Post
When is the last time you saw a car on the road with a one-gear transmission?
It has a fixed pitch prop.

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  #55  
Old 03-01-2012, 12:38 PM
paul mosher
 
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Default aerocar

Yes it does. And it's neither a good car or a good airplane.
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  #56  
Old 03-01-2012, 01:03 PM
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Default DO YOUR RESEARCH GUYS!

This car did NOT drive on the road with a single speed transmission!
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  #57  
Old 03-01-2012, 01:38 PM
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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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  #58  
Old 03-01-2012, 01:49 PM
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NickAir NickAir is offline
 
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Default 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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  #59  
Old 03-01-2012, 01:51 PM
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Exclamation 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.
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Last edited by rv7boy : 03-01-2012 at 02:40 PM. Reason: Added the "Mel" parenthesis.
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  #60  
Old 03-01-2012, 02:34 PM
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Mark Albery Mark Albery is offline
 
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Default

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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