<VV> Electric fans, pusher or puller

[jvhroberts at aol.com]

 Actually, it is the fan. 20% efficiency sucks the big one. All air cooled engines have substantial resistance to air flow, and in fact, you want that, as turbulent flow (which is inherently more 'draggy' than laminar flow) is much better at heat transfer. Sure, more open area is a good idea, but that's not where the really big wins are going to come from. It'll come from a high efficiency design that generates much higher static pressure than the stocker. No reason why a blower, at these pressures, can't exceed 70% efficiency where it really counts. 

 

John Roberts
 

 

-----Original Message-----
From: Ron <ronh at owt.com>
To: lechevrier <lechevrier at q.com>; virtualvairs <virtualvairs at corvair.org>; jvhroberts <jvhroberts at aol.com>
Sent: Mon, Mar 18, 2013 2:18 pm
Subject: Re: <VV> Electric fans, pusher or puller


Problem is that it isn't the fan that's sucking the hp but the high 
resistance of the engine cooling passages.  If you want some results, 
redesign your engine for larger cooling passages and more fins.
RonH

----- Original Message ----- 
From: <jvhroberts at aol.com>
To: <lechevrier at q.com>; <virtualvairs at corvair.org>
Sent: Monday, March 18, 2013 3:40 AM
Subject: Re: <VV> Electric fans, pusher or puller


>
> Yeah, the mule drive does stink, but a large part of that is how much HP 
> the fan sucks at full speed.
>
> As far as a simpler, less expensive solution, an electric drive with 
> enough HP to do the job is the antithesis of that!
>
>
>
> John Roberts
>
>
>
>
> -----Original Message-----
> From: Bill & Chris Strickland <lechevrier at q.com>
> To: virtualvairs <virtualvairs at corvair.org>
> Sent: Mon, Mar 18, 2013 4:00 am
> Subject: Re: <VV> Electric fans, pusher or puller
>
>
>
>> what problem does an electric drive solve,
>
> The serpentine routing of the stock Corvair fan belt (allows one to
> rotate the alternator for straight line belt use)
>
>>   and is there a simpler, less expensive solution ...
>
> Not according to some folks.
>
> Bill Strickland
>
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