Fan Blade Spacing ??
Thread Starter
Le Mans Master
Joined: Jun 2002
Posts: 8,339
Likes: 24
From: I can walk to MA
Fan Blade Spacing ??
Well, this topic originates from an email that another member sent me.
The original concern was that the assymetric blades should be aligned
somehow with the clutch. I think "no", but feel free to make me wrong.
SO, assuming they are not assymetric for balance reasons, does anyone
here know why the blade spacing is not even - around the circumference ??
Luckily, my electric fan makes this question moot for me.
The original concern was that the assymetric blades should be aligned
somehow with the clutch. I think "no", but feel free to make me wrong.
SO, assuming they are not assymetric for balance reasons, does anyone
here know why the blade spacing is not even - around the circumference ??
Luckily, my electric fan makes this question moot for me.
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
the blades are indeed asymmetrically spaced however the fan is perfectly balanced, there's no one side that's heavier than the others, the unequal spacing is to eliminate resonance at certain rps resulting in excessive wear of the clutch & waterpump and noise. Look closely at your electric fan, chances are it's asymmetrical also...mine is.
Thread Starter
Le Mans Master
Joined: Jun 2002
Posts: 8,339
Likes: 24
From: I can walk to MA
Yup - I was under the impression that it is still balanced.
I'll have to look tonight ... pretty sure my electric is all evenly spaced.
caveat: mine is a cheapo fan ... less than $100.
Perhaps it is meant to self-destruct after a period of time.
Boy - you'd think with 4 engineering degrees, I could spell asymmetric correctly
Thanks for correcting me
I'll have to look tonight ... pretty sure my electric is all evenly spaced.
caveat: mine is a cheapo fan ... less than $100.
Perhaps it is meant to self-destruct after a period of time.
Boy - you'd think with 4 engineering degrees, I could spell asymmetric correctly
Thanks for correcting me
Drifting
Joined: Nov 2001
Posts: 1,469
Likes: 6
From: 68 427 4.11s Roadster
I always figured it was to slip the belt on easier and allow a bit of space for other knuckle rasping work up there.
I don't see how leaving a gap helps resonance. I don't know of any fans, air props or water props that don't use exact spacing for ballance.
Of course don't mean it aint true.
I don't see how leaving a gap helps resonance. I don't know of any fans, air props or water props that don't use exact spacing for ballance.
Of course don't mean it aint true.
