Today's Message Index:
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1. 07:39 AM - Re: Re: upholstery (Juan Vega)
2. 08:02 AM - Re: Re: upholstery (Paul Mulwitz)
Message 1
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all;
memory foam is great for the tush However, take a piece of memory foam and put
it in your hand, you will notice it is very Heavy! memory foam used in excess
on the plane will contribute to 10 more lbs easily! and reweighting of the
plane, Yuck! try using it sparingly in pressure areas like the bottom seat
only.
As for vibration, just get you engine and prop balanced and most vibration should
be diminished.
Juan
-----Original Message-----
>From: Paul Mulwitz <psm@att.net>
>Sent: Apr 9, 2010 1:09 PM
>To: zenith-list@matronics.com
>Subject: RE: Zenith-List: Re: upholstery
>
>
>Hi Pat,
>
>The folks at Oregon Aero came to one of my EAA chapter meetings and gave
>some impressive demos of the memory foam. The one that left the biggest
>impression used a large steel ball (like the kind in old pinball machines)
>and bounced it off a variety of rubber cushions. When it hit most of them
>it bounced, but when it hit a thin sandwich of pink and blue memory foam it
>just about stuck. This showed how much power the memory foam has to
>eliminate jarring vibration to the bottom of your spine.
>
>I suggest you consider this vibration issue as well as sitting comfort when
>making up your seats. A thin layer of both types of memory foam might work
>a lot better to absorb shocks than either one can alone.
>
>Paul
>XL doing upgrade
>
>
>-----Original Message-----
>From: owner-zenith-list-server@matronics.com
>[mailto:owner-zenith-list-server@matronics.com] On Behalf Of PatrickW
>Sent: Friday, April 09, 2010 9:32 AM
>To: zenith-list@matronics.com
>Subject: Zenith-List: Re: upholstery
>
>
>Sounds like we're at about the same point.
>
>I just started making my seats. Was intending to do the 3 layers of "comfor
>foam", but when I laid that up and sat in the airplane and close the canopy,
>it turns out that I'm just too tall, even with the 650 canopy I installed on
>my XL.
>
>I ended up going with a layer of green foam over the aluminum seat pan, and
>then on top of that I did one seat with a single layer of blue foam, and the
>other seat with a single layer of pink.
>
>I sat in both of them for a long time to see if they became uncomfortable.
>Felt ok. I'm making my seats interchangeable, so I can test each one, and
>then the one I like best (blue vs pink foam) is the one I'll go with.
>
>- Pat
>
>--------
>Patrick
>XL/650/Corvair
>N63PZ (reserved)
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=293660#293660
>
>
Message 2
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Hi Juan,
I'm sure you are right about regular vibration. However, another kind (call it:
Impulse Vibration?) happens on a hard landing or crash. This is the kind that
can damage spines and cause paralysis or even death.
I suspect you are right that a thin layer or sandwich of memory foam is sufficient
to deal with these issues. It certainly is heavier than normal upholstery
foam.
One other issue with upholstery foam to consider is its contribution to deadly
gasses in a fire. Most of these foams are made from polyurethane. This stuff
generates the incredibly deadly gas HCN - Hydrogen Cyanate, AKA Cyanide gas.
It used to be used for public executions in the gas chamber. I'm not sure how
this plays out in airplane accidents and fires, but when the upholstery foam
(or carpet foam in large planes) is exposed to fire the resulting fumes are the
most likely cause of death to people on the plane.
Oddly, it may be that the choice of upholstery foam is the one decision that has
the most impact on airplane utility and safety.
Paul
-----Original Message-----
From: owner-zenith-list-server@matronics.com [mailto:owner-zenith-list-server@matronics.com] On Behalf Of Juan Vega
Sent: Saturday, April 10, 2010 7:39 AM
Subject: RE: Zenith-List: Re: upholstery
all;
memory foam is great for the tush However, take a piece of memory foam and put
it in your hand, you will notice it is very Heavy! memory foam used in excess
on the plane will contribute to 10 more lbs easily! and reweighting of the
plane, Yuck! try using it sparingly in pressure areas like the bottom seat
only.
As for vibration, just get you engine and prop balanced and most vibration should
be diminished.
Juan
-----Original Message-----
>From: Paul Mulwitz <psm@att.net>
>Sent: Apr 9, 2010 1:09 PM
>To: zenith-list@matronics.com
>Subject: RE: Zenith-List: Re: upholstery
>
>
>Hi Pat,
>
>The folks at Oregon Aero came to one of my EAA chapter meetings and gave
>some impressive demos of the memory foam. The one that left the biggest
>impression used a large steel ball (like the kind in old pinball machines)
>and bounced it off a variety of rubber cushions. When it hit most of them
>it bounced, but when it hit a thin sandwich of pink and blue memory foam it
>just about stuck. This showed how much power the memory foam has to
>eliminate jarring vibration to the bottom of your spine.
>
>I suggest you consider this vibration issue as well as sitting comfort when
>making up your seats. A thin layer of both types of memory foam might work
>a lot better to absorb shocks than either one can alone.
>
>Paul
>XL doing upgrade
>
>
>-----Original Message-----
>From: owner-zenith-list-server@matronics.com
>[mailto:owner-zenith-list-server@matronics.com] On Behalf Of PatrickW
>Sent: Friday, April 09, 2010 9:32 AM
>To: zenith-list@matronics.com
>Subject: Zenith-List: Re: upholstery
>
>
>Sounds like we're at about the same point.
>
>I just started making my seats. Was intending to do the 3 layers of "comfor
>foam", but when I laid that up and sat in the airplane and close the canopy,
>it turns out that I'm just too tall, even with the 650 canopy I installed on
>my XL.
>
>I ended up going with a layer of green foam over the aluminum seat pan, and
>then on top of that I did one seat with a single layer of blue foam, and the
>other seat with a single layer of pink.
>
>I sat in both of them for a long time to see if they became uncomfortable.
>Felt ok. I'm making my seats interchangeable, so I can test each one, and
>then the one I like best (blue vs pink foam) is the one I'll go with.
>
>- Pat
>
>--------
>Patrick
>XL/650/Corvair
>N63PZ (reserved)
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=293660#293660
>
>
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