Re: Propeller camber

From: <RLBailey_at_care4free.net>
Date: Thu, 8 Apr 2010 11:07:03 +0100

In addition to Nick's reply, I recommend 3 - 4% camber on blades. Much less usually means lots of revs and not much thrust.

Bob

  ----- Original Message -----
  From: ykleetx
  To: Indoor_Construction_at_yahoogroups.com
  Sent: Thursday, April 08, 2010 2:22 AM
  Subject: [Indoor_Construction] Propeller camber


    
  Hi,

  I've been making propellers by wrapping around oatmeal jars. I'm ready to graduate to making helically pitched props and will make the prop forms from styrofoam. After reading as much as I could, I think I'm almost ready.

  I would like to ask about the amount of camber in a propeller blade, and what is considered efficient. For example, one plan calls for 10% camber in the propeller blade. If I interprete this camber percentage in the same way as a wing airfoil camber, this means the camber thickness would not be the same across the length of the propeller.

  In Larry Corslick's Hobbyshopper article, he describes forming camber using a 3/32" sheet in the shape of the prop.

  First, what are some thoughts on the right way to specify camber -- by percentage (for example 10%) or by thickness (for example 3/32")?

  Second, for the way that you specify camber (in % or in inches) values are considered efficient for different model classes? For example, for an F1L or LPP, what are considered efficient camber values?

  Third, how do you put this specified camber into the propellers you make?

  I look forward to hearing your thoughts on propeller camber.

  -Kang



  
Received on Thu Apr 08 2010 - 03:07:20 CEST