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).
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
RMC, PPCC, SDCC, NJACE
This message was sent by the VirtualVairs mailing list, all copyrights are
of the writer, please attribute properly. For help,
mailto:vv-help at corvair.org
This list sponsored by the Corvair Society of America,
Post messages to: VirtualVairs at corvair.org
Change your options: http://www.vv.corvair.org/mailman/options/virtualvairs
This email has been checked for viruses by AVG.
More information about the VirtualVairs