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lenght and pitch

 
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lrm(at)skyhawg.com
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PostPosted: Wed Jan 23, 2008 7:20 pm    Post subject: lenght and pitch Reply with quote
I need the for calculating the length and pitch I need for a two blade prop. Make it simple please, I only got ten toes.


Larry, www.SkyHawg.com, N1345L [quote][b]

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alaskajim(at)cox.net
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PostPosted: Thu Jan 24, 2008 7:36 am    Post subject: lenght and pitch Reply with quote
I'm no expert by any means but know if I already have a basis, for example, my current prop (64/45)  turns up 2700 rpm's static and I would like to have 3100, then I use this basic rule of thumb:    Each increase/decrease in one inch of pitch should change the rpm's by about 100.  Adding/subtracting an inch in length decreases/increases rpm by about 150 rpm.    In my case, I'm going from a 64/45 to a 68/36.   If I add 4"  in length, rpm goes down 600-rpm to 2100-rpm but then decrease pitch by 9" adds 900 rpm so am expecting a static of around 3,000-rpm.   This is just a ROUGH guess but seems close for a two bladed prop on a slow draggy aircraft like the 701, J-3 etc.  
On Jan 23, 2008, at 8:17 PM, LRM wrote:
Quote:
I need the for calculating the length and pitch I need for a two blade prop.  Make it simple please, I only got ten toes.
 

Larry, www.SkyHawg.com, N1345L
Quote:
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