[Healeys] Curved or Straight

warthodson at aol.com warthodson at aol.com
Fri Jan 24 14:59:34 MST 2020

There are many things that affect the selection of the blade design besides efficiency. Such as, strength, cost of manufacturing, noise generation, desired CFM at a specific resistance, (pressure drop), marketability to name a few. 
I have a "Spal" brand of fan. Because it appeared to be high quality, was thin enough to fit in front of my radiator & produced a relatively high CFM at about .25" pressure drop.

Gary Hodson

-----Original Message-----
From: Patrick & Caroline Quinn <p_cquinn at tpg.com.au>
To: healeys <healeys at autox.team.net>
Sent: Fri, Jan 24, 2020 3:26 pm
Subject: [Healeys] Curved or Straight

<!-- #yiv4865601795 _filtered {} _filtered {} #yiv4865601795 #yiv4865601795 p.yiv4865601795MsoNormal, #yiv4865601795 li.yiv4865601795MsoNormal, #yiv4865601795 div.yiv4865601795MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:11.0pt;font-family:"Calibri", "sans-serif";} #yiv4865601795 a:link, #yiv4865601795 span.yiv4865601795MsoHyperlink {color:blue;text-decoration:underline;} #yiv4865601795 a:visited, #yiv4865601795 span.yiv4865601795MsoHyperlinkFollowed {color:purple;text-decoration:underline;} #yiv4865601795 span.yiv4865601795EmailStyle17 {font-family:"Times New Roman", "serif";color:windowtext;} #yiv4865601795 .yiv4865601795MsoChpDefault {font-family:"Calibri", "sans-serif";} _filtered {} #yiv4865601795 div.yiv4865601795WordSection1 {} -->Hello  Once again I am about to investigate the engine cooling of the Healey Duncan. Nothing highly unusual with it in that it’s a Riley 2.4 litre engine and unpressurised.  Part of the process is to replace the existing Kenlowe electric fan with a more modern unit. The Kenlow sits over an inch from the radiator surface while a modern unit should only be a few millimetres. Of course it was never fitted with an electric fan when new, but it’s simply not coping with the warmer Australian climate.  I will be doing all sorts of wonderful things like removing the cylinder head to replace the cooling tube between number two and three combustion chamber, refurbishing the radiator, rodding the block etc etc.  The question that’s on my mind concerns whether to install an electric fan with curved or straight blades. Australian manufacturer Davies Craig says that straight blades are best, but they would say that as that’s what they make.  Anyone undertaken any research as to what’s the most efficient?  Hoo Roo  Patrick QuinnBlue Mountains, AustraliaWhere it’s raining again - wonderful_______________________________________________
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