Mayf;
As Dan suggested, maybe the beer can rebound test will supply enough data.
I don't think salt is "soft" but the question is "is it "elastic" in the
strict physics definition?"
Regards, Neil Tucson, AZ
-----Original Message-----
From: DrMayf [mailto:drmayf@teknett.com]
Sent: Wednesday, August 13, 2003 10:28 AM
To: Albaugh, Neil; 'Dave Dahlgren'
Cc: land-speed@autox.team.net
Subject: Re: Bonneville Request
Sorry, Neil. My test is CoF only. Maybe some of you other folks could come
up with some rough science of your own? I know the physics involved in the
COF but donot have a clue as to the rolling resistance afforded by soft
media...which I don't think the salt is...
mayf
----- Original Message -----
From: "Albaugh, Neil" <albaugh_neil@ti.com>
To: "'Dave Dahlgren'" <ddahlgren@snet.net>; "'DrMayf'" <drmayf@teknett.com>
Cc: <land-speed@autox.team.net>
Sent: Wednesday, August 13, 2003 9:08 AM
Subject: RE: Bonneville Request
> Dave & mayf;
>
> Let me propose a slight addition to your "salt hardness test". In
> addition to "...dropping a sphere of a known weight and height and
> checking the
depth
> of the depression..." it would be useful to also measure the height
> that that sphere rebounds to. This will add a data point that measures
> the coefficient of restitution-- how much energy is lost by that
> deformation
and
> springback. My guess is that the higher the coefficient is, the less
> power is required to make that "rolling dent" in the salt surface.
> Sort of like the difference in a train wheel rolling on a steel rail
> and rolling in
sand.
>
> Regards, Neil Tucson, AZ
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