2 (two) props...same engine?  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> 2 (two) props...same engine?
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2 (two) props...same engine? - 1/1/2002 8:41:15 AM   
ifly-RCU


 

Posts: 176
Joined: 12/19/2001
From: Vassar, MI, USA
Status: offline 		i ran my .10 with 2 7x6 props on but im not sure if it put out more thrust or not

the rpms did go down(just by hearing it...no tach)

would this boost proformance or just ware the engine out faster?

any one did this??
       Post #: 1

Let me get this straight - 1/11/2002 1:56:38 AM   
Chris 540



Posts: 1058
Joined: 12/3/2001
From: hampden, ME, USA
Status: offline 		So you put both props on at the same time?? And ran the engine?? Why???:p

(in reply to ifly-RCU)
       Post #: 2

2 (two) props...same engine? - 1/12/2002 5:08:47 AM   
gubbs3



Posts: 1403
Joined: 12/8/2001
From: Coon Rapids, MN, USA
Status: offline 		It would be a lot better just to get a four bladed prop. As a rule of thumb, take one inch off for each extra blade.
Ex.- 10 x 6 2 blade
go to 9 x 6 3 blade and 8 x 6 four blade.

(in reply to ifly-RCU)
       Post #: 3

2 (two) props...same engine? - 1/12/2002 6:46:46 AM   
Mr. Wildcat


 

Posts: 21
Joined: 12/29/2001
Status: offline 		Increasing the number of props decreases its efficiency. The most efficient props are one bladed followed by the more common 2 blade props we use. Multiblade props are normally used to obtain ground/fuse clearances, not extra power.

(in reply to ifly-RCU)
       Post #: 4

2 (two) props...same engine? - 1/12/2002 10:03:26 PM   
Elwood



Posts: 1512
Joined: 12/11/2001
From: Wayne, NJ,
Status: offline 		Stacking props will decrease the second props ability to produce thrust. There are not many aircraft that have stacked props, but when they do, they counter-rotate. Check out the Topolev Bear Bomber.

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< Message edited by Elwood -- Jan 12 2002 5:07PM >

_____________________________

Born in the U.S.A.......Not quite as long ago as Art!!!!!!!

(in reply to ifly-RCU)
       Post #: 5

2 (two) props...same engine? - 1/12/2002 10:06:27 PM   
Elwood



Posts: 1512
Joined: 12/11/2001
From: Wayne, NJ,
Status: offline 		Could not resist this pic. It shows just how they were dealt with, and by who!

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_____________________________

Born in the U.S.A.......Not quite as long ago as Art!!!!!!!

(in reply to ifly-RCU)
       Post #: 6

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