Which Propeller to choose???  
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Which Propeller to choose??? - 11/20/2007 12:07:29 PM   
neuroza


 

Posts: 118
Joined: 11/17/2007
From: Porec, CROATIA (HRVATSKA)
Status: offline 		Hi, can please anybody advise me Which propeller (size) to choose for my hand made plane.
It weight with all the servos, BUT WITHOUT THE ENGINE, around 1,5 kg (3,3 pounds).
The wing span is 1,10 meter (43 inch).
The engine is MAGNUM GP 40.

Thanks!
       Post #: 1

RE: Which Propeller to choose??? - 11/20/2007 1:45:15 PM   
tstotts


 

Posts: 230
Joined: 10/5/2005
From: Coffeyville, KS, USA
Status: offline 		Try a 9x7

_____________________________

Troy Stotts
AMA 4211

(in reply to neuroza)
       Post #: 2

RE: Which Propeller to choose??? - 11/20/2007 5:01:20 PM   
jrf


 

Posts: 2335
Joined: 12/30/2001
From: Burbank, CA, USA
Status: offline 		A 9x7 will be fastest, a 10x6 will be a little slower but have better accelleration and vertical pull. The 10x6 will use less fuel and make less noise.

Jim

(in reply to neuroza)
       Post #: 3

RE: Which Propeller to choose??? - 5/6/2008 1:36:28 PM   
speedair


 

Posts: 38
Joined: 10/31/2007
From: bangorwales, UNITED KINGDOM
Status: offline 		i would use a 10*6 on a 40 engine

(in reply to jrf)
       Post #: 4

RE: Which Propeller to choose??? - 5/7/2008 2:49:50 AM   
catracer343



Posts: 78
Joined: 4/12/2006
From: Hillsborough, NH, USA
Status: offline 		Or if you want slower flight with more pulling authority, you could try an 11-4 or 5.

_____________________________

The law of physics states: What goes up, must come down. -They never said how hard though.......

(in reply to speedair)
       Post #: 5

RE: Which Propeller to choose??? - 5/7/2008 12:36:34 PM   
skylark-flier


 

Posts: 98
Joined: 9/25/2002
From: Luray, VA, USA
Status: offline 		All these responses are correct. One additional note to the 11x4 idea, I'm restoring a 40-year old scale biplane right now and it will run on an OS-40LA. I'm planning to use an 11x5, both to keep the speed down and still maintain the capability of near-vertical climb, should anything "unkind" come up while flying.

An 11-inch prop will be putting nearly any .40 engine to some stress, so don't expect full RPM with a prop that long. But the sheer POWER available is awesome.

Dave

_____________________________

Dave W. - - "Old-school" R/C & C/L Flier & Instructor

(in reply to catracer343)
       Post #: 6

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