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Re: Speed vs hp.

To: Simon Rasmussen <Simon@telephonestogo.ca>
Subject: Re: Speed vs hp.
From: Larry Young <cartravel@pobox.com>
Date: Tue, 10 Aug 2004 13:47:09 -0500
Rolling resistence is a constant force, so the power required to 
overcome it will increase linearly with speed.  Drag will dominate at 
high speed.  Drive train friction is the other big friction loss.  It is 
usually assumed to be a constant factor, typically 10 to 15 percent.

Simon Rasmussen wrote:

>Jack, I believe that both aero drag and rolling resistance change as the
>square of speed, so for a given percentage increase in speed you need the
>square of that percentage increase in power.
>So, if you want to increase your speed fromm 100 mph to 110 mph you need
>1.1x1.1x100= 121-100=21% more power. For 20% more speed you need 44% more
>power and so on. Hope this is correct.
>Simon.
>
>Regards,
>Simon Rasmussen
>Sales Manager - Telephones To Go
>Email: Simon@TelephonesToGo.ca
>Mobile: (416) 565-0031
>Tel: (416) 650-0000
>Fax: (416) 650-5751

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