[Healeys] Curved/quiet or Straight/efficent

Patrick & Caroline Quinn p_cquinn at tpg.com.au
Fri Jan 24 21:04:07 MST 2020

Hello Harold


Thanks for your input.


I know that at higher speeds an electric fan becomes superfluous, however my initial question did not concern the cooling of an Austin-Healey, but that of a Healey.


Be that as it may, the cooling system of a Healey is I believe more efficient than that of an Austin-Healey, especially that of a six-cylinder. As an aside it’s interesting to look at the BMC part number for a radiator for a six-cylinder Austin-Healey. There was no change in the part number whether it was for a 100/6 engine producing 102bhp right through to the BJ8 producing 141bhp. The only thing that was different was the radiator pressure cap that gradually increased with the corresponding increase in bhp.


In other words BMC engineers really didn’t give much consideration to an improvement in engine cooling especially for warmer climates, fan blades excepted.


Hoo Roo


Patrick Quinn


From: Harold Manifold [mailto:manifold at telus.net] 
Sent: Saturday, 25 January 2020 1:32 PM
To: 'Perry'; warthodson at aol.com; p_cquinn at tpg.com.au
Subject: RE: [Healeys] Curved/quiet or Straight/efficent


Have a look at this article. BTW fans don't do much at speeds over 25 MPH.




For the record I am of the belief that the Healey cooling system is marginal as a result of all of the key components being marginal: water pump, fan, radiator, thermostat, bypass system, pressure rating, etc. are all less than ideal. There is no magic solution and the best approach is to keep all of components in as good an operating condition as possible. Good performance by one component will likely not compensate for poor performance by one of more of the other components.


Just my thoughts ... Harold





From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Perry via Healeys
Sent: Friday, January 24, 2020 3:16 PM
To: warthodson at aol.com; p_cquinn at tpg.com.au
Cc: healeys at autox.team.net
Subject: Re: [Healeys] Curved/quiet or Straight/efficent

Take a look at:




Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986>  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. 


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. 



-----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! 😊




Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986>  for Windows 10




-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/healeys/attachments/20200125/208d9b26/attachment.htm>

More information about the Healeys mailing list