[Healeys] Curved/quiet or Straight/efficent

[Perry]

Take a look at:
https://www.hunker.com/13407187/how-to-calculate-cfm-from-rpms
Perry

Sent from Mail for Windows 10

From: warthodson at aol.com
Sent: Friday, January 24, 2020 5:49 PM
To: healeyguy at aol.com; p_cquinn at tpg.com.au
Cc: healeys at autox.team.net
Subject: Re: [Healeys] Curved/quiet or Straight/efficent

I am confused by the terminology & illustrations on this site. 
Terminology: 
Pitch = angle of attack. An efficient fan/propeller blade usually has a higher pitch near the hub (center) than at the tip. A blade with a constant pitch is less efficient.

Blade Camber is the equivalent of a wing airfoil. A flat blade = 0 camber is generally less efficient than a blade with a camber/ arch/airfoil. However, the camber has t be appropriate to the application. 

Gary

-----Original Message-----
From: Perry via Healeys <healeys at autox.team.net>
To: Patrick & Caroline Quinn <p_cquinn at tpg.com.au>
Cc: healeys at autox.team.net <healeys at autox.team.net>
Sent: Fri, Jan 24, 2020 4:11 pm
Subject: Re: [Healeys] Curved/quiet or Straight/efficent
Sir Patrick
Please peruse the web site at: https://daviescraig.com.au/blog/straight-vs-curved-fan-blades-dispelling-the-myth
They must have the best info on the globe since they are located down under! 😊
Perry
 
 
Sent from Mail for Windows 10
 


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/healeys/attachments/20200124/02e17961/attachment.htm>