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Engine basics => Engine set up tips => Topic started by: Walter Johnson on January 23, 2007, 06:44:18 AM

Title: PA 51 Piped Prop Selection
Post by: Walter Johnson on January 23, 2007, 06:44:18 AM

What would be a good starting point 2 or 3 blade prop for a Tempest II / PA 51 Pipe combo and the advantages or not between 2 or 3 blade and brands available. Thank You Walt y1

Title: Re: PA 51 Piped Prop Selection
Post by: RandySmith on January 23, 2007, 10:45:01 AM

Quote from: Walter Johnson on January 23, 2007, 06:44:18 AM

What would be a good starting point 2 or 3 blade prop for a Tempest II / PA 51 Pipe combo and the advantages or not between 2 or 3 blade and brands available. Thank You Walt y1

HI Walt

The Bolly 12.2 x 4.2  2 blade and the Bolly 12 x 4.25  3 blade are the best to start, This is what I use on my 51  and  are  excellent choices.

Both have advantages and disadvantages, just a few  are :
three blades are quieter, the are also a little less prone to wind whip up , and sometimes are more of a constant speed. Two blades are easier to turn, are lighter, cycle faster  4\2  , load the motor less
I can use either with great results, just have a little bit differant setup with the two differant props

Regards
Randy

Title: Re: PA 51 Piped Prop Selection
Post by: Bill Little on January 23, 2007, 12:39:58 PM

I have personally used the Bolly 12.2X4.2 2 blade on my PA 51 with the pipe as Randy can attest.   He has flowm my plane (a modified Saturn) which is in the mid  50 oz range.  I have not seen a need to go to a 3 blade on that one, yet. ;D

Bill <><

Title: Re: PA 51 Piped Prop Selection
Post by: Walter Johnson on January 24, 2007, 06:42:35 AM

Thank You Bill and Randy for the suggestions, looks like I will start with a two blade and go from there. The PA 51 I have was bought back in 1996 and was able to purchase it from a friend who decided it was to much at the time for him. He had bought a Bolly two blade then that I have looking at the scribe ID it looks to be a 12.6x3.8 I think a little tough to read. I'll put a little chalk to it and see if it reads better but will purchase a new prop in those numbers above. Thanks All Walt :)

Title: Re: PA 51 Piped Prop Selection
Post by: RandySmith on February 22, 2007, 08:40:21 PM

Quote from: Walter Johnson on January 24, 2007, 06:42:35 AM

Thank You Bill and Randy for the suggestions, looks like I will start with a two blade and go from there. The PA 51 I have was bought back in 1996 and was able to purchase it from a friend who decided it was to much at the time for him. He had bought a Bolly two blade then that I have looking at the scribe ID it looks to be a 12.6x3.8 I think a little tough to read. I'll put a little chalk to it and see if it reads better but will purchase a new prop in those numbers above. Thanks All Walt :)

Hi Walt

The  12.6 x 3.8 is a little flat  but  will work  well  if it is  pitched  up  some, to about  4.2

Regards
Randy