Date:         Wed, 31 Oct 2012 11:46:15 -0400
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: Wiper blade recommendation?  Now Length?
Comments: To: Alistair Bell <albell@SHAW.CA>
In-Reply-To:  <51FBA256-970B-45E7-B464-7D8C38AF6D19@shaw.ca>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 11:15 AM 10/30/2012, Alistair Bell wrote:
>some food for thought... a switch from 19" to 21" blades results in
>an (rough estimate) 22% increase in swept area. If one assumes same
>swept area increase on pass. side wiper, it would be a 44% swept
>area increase overall (from stock)l. Boy that seems like a lot doesn't it?

It does seem like a lot.  If you assume that the 19" blades sweep out
an arc with a 5" radius hole in the middle, giving r=24", then
shifting to 21" blades (r=25" with 4" hole) gives a difference of
~ten per cent.  If this happens twice (driver and passenger side) the
difference will still be ten per cent because your initial swept area
is also increasing.

Does this not fit better with intuition?

Yrs,
d