<VV> Fans

Hugo Miller Hugo at aruncoaches.co.uk
Thu Nov 16 15:14:35 EST 2017

### The (British) Rover 2000 had an odd-looking radiator fan - all the 
blades were unevenly spaced - apparently this was to keep the noise down (or 
presumably reduce the 'harmonics).

-----Original Message----- 
From: Kenneth Schifftner via VirtualVairs
Sent: Thursday, November 16, 2017 7:50 PM
To: VirtualVairs at corvair.org
Subject: Re:  Fans

With industrial duty fans, the fan speed range is set by the fan wheel 
characteristics and the Fan Laws. Harmonics are to be avoided. A book called 
“Fan Engineering” explains these details. What is usually done is design 
adjustments are made to the fan width and diameter but the speed is selected 
to avoid the harmonics. Another factor is noise…more blades (usually) more 
noise. Radial bladed fans such as the later model fans are inherently 
inefficient (but easier to mold) so Kevin’s design looks like a way to 
improve the efficiency. Go for it!

Once Kevin gets the fan running, these things will become apparent. If I 
were doing this, I’d keep the pulley diameters the same but tweak the wheel 
width and diameter to suit the desired performance. Might take a few 
iterations but the potential is there!

Sure, a proper width “loose" belt usually works for most, but what’s the fun 
in that?

Ken Schifftner

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