<VV> Fans (AGAIN.)(G)

[Ron]

Blocking outlet?  So they could offer a hot air heater.

RonH

----- Original Message ----- 
From: <ScottyGrover at aol.com>
To: <virtualvairs at corvair.org>
Sent: Monday, August 27, 2007 9:49 PM
Subject: <VV> Fans (AGAIN.)(G)


> I've been reading R.P. Benzinger's article in the SAE papers and I find 
> some
> interesting statements which I would like to have clarified, if anyone can
> help.
> In the section re: cooling system, he says that restricting the inlet with 
> a
> fan ring is more effective than blocking the outlet for unloading the fan
> drive (he includes a graph); why then did GM get rid of the fan ring and 
> go to
> the exit doors? Cost? Complexity?
> Early fan (24-vane) burst strength is good for 8000 RPM.  Granted that 
> later
> fans (16-vane) are more complex in their construction, could it be that 
> they
> could handle the high RPM before they have structural problems?
> The 24-vane fans were made from .060" sheet steel.  Does anyone have  any
> idea what thickness of aluminium would be required to duplicate the 
> strength  of
> this fan under load?
> The 16-vane fans were made with radial blades having a forward curve to
> their leading edges so as to scoop air into the space between the blades. 
> This
> tends to load the fan drive.  Backward-inclined blades are standard on 
> HVAC
> blowers to lower the load on the motor when the fan is heavily loaded; 
> they
> induce slip and don't load the fan the way the OEM fans load the 'Vair 
> drive; is
> anyone familiar with this type of fan wheel and could say whether it could 
> be
> adapted to a 'Vair?
>
> Scotty from Hollyweird
>
>
>
>
>
>
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