Re: chassis stiffening: foam in the rockers...

[Dan <dan@angband.org>]

On Fri, Jun 29, 2001 at 11:51:40PM -0400, Shawn C Meze wrote:

> How so? 
> The foam that ive seen would go into a void and expand. Since its not a
> porus sort of confection how could moisture get in? 

It is pourus to some extent... look at any older Boston Whaler boat where
someone neglected to seal a thru-hull fitting properly...  or ask a 914
pwner what they think of Porsche's use of urethane foam to fill the
windsheild support members.  Water wicks in and during the freeze-thaw
cycle seperates the foam from the metal, advancing the water
intrusion.  They rust from the inside out... By the time you see any
surface defects, it is too late to do anything.

I think it would
> probably do a good job but my recollection is that this stuff is actually
> pretty heavy (as foam goes.)

Depends on the mix ratio of the 2 parts... At one company I worked for, we
spec'd a pour-in-place foam from a company called "Structured Platics", in
Kennesaw, GA IIRC.  We just needed a light molded thermal inulation part,
but they showed us all kinds of aplications.  Urethane come can be cast
dense enough that it feels (and carves&cuts) like a good hardwood, or
extrruded into packaging pellets less dense than styrofoam peanuts.

Dan

-- 
           The Creation of the Universe was made possible by
           a grant from Texas Instruments.
                                                          
           -from "The Creation of the Universe" on PBS  


--
Email LIST problems to: scirocco-l-probs@scirocco.org.
To unsubscibe send "unsubscribe scirocco-l" in the message to majordomo@scirocco.org