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Re: Canadian Fans

To: LeBrun@hii.hitachi.com
Subject: Re: Canadian Fans
From: STUART_BRENNAN@HP-Andover-om3.om.hp.com
Date: Wed, 15 Oct 97 13:28:08 -0600
     >The fastest prop plane ever was the 5 bladed scimitar propeller P-47N 
     >which did 504 mph.
     
     >Typhoons, Tempests, Spitfires, and a lot of Russian turboprops use in 
     >high performance versions used 5 bladed or more props.
     
     >mBrad
     
     Reply:
     
     I think the problem here was power.  As the built more powerful 
     engines, they could turn larger and larger props.  At some point they 
     had to decide to either make the landing gear taller, or add more 
     blades.  Didn't I see an experimental DC-9 with a 6 or 7 blade 
     turboprop engine stuck on the back?  Again they were trying to deliver 
     a lot of power in a small diameter.  Just like we're trying to move a 
     lot of air in a small diameter.  For the same blade shape, the more 
     the better until the start to interfere with each other.
     
     Maybe we would have seen more 5 or 6 blade machines if jets hadn't 
     taken over just after this era.
     
     Stu

     
     


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