CMP seat base size?

[Bob Carriere]

We need to make quite a few here at the barn.

Toying with the idea of medium density on top....about one inch (25mm)....soft in the middle for about inch the rest in harder density for the bottom....

Or maybe medium hard medium...... and forget the soft....... should be easy to cut to shape once glued into a block using the band saw..... just compress the foam between two sheets of plywood.

For the back rest I assume that one inch of medium foam would be enough.

Cheers

[hrpearce]

Sorry Bob what I was trying to say is High density only just supports me, I think that medium and light density would let you sink straight to the metal base.

[Bob Carriere]

Suppose I could take some crunched up money dollar bills from my mattress and fill up the CMP seat.

Regular car seats use foam over flat steel coils.....

Are we better to rebuild the original coil spring seats with one inch of foam on top....?

Who else has been bustin' their a** on foam seats???

Cheers

[Ganmain Tony]

If you can Bob, especially in Cab 11s and 12s. I went the foam way and its only just enough.

Ok on the back.... but it aint quite enough for the backside

[Grant Bowker]

I have noticed that some vendors describe their foam's firmness in terms of what weight applied to a 50 sq.in. area is required to achieve 25% compression of a 4" sample rather than soft/firm. The loads stated vary from 15 up to 90 pounds (maybe a wider range?. Since this is a static load and bumps make a dynamic load (perhaps 2-3G???) I was thinking a seat base should be at least mainly the firmest foam I could find. Did any of the people with experience of foam use foam number rated in the way I described and if so, what was the Indentation Load Deflection, or ILD number? I prefer a numeric system over "soft" or "firm" as the words can mean different things to different people but a properly defined numeric system should mean the same thing in every case.

[rob love]

Perhaps the foam question would be one best asked of an experienced upholstery shop.

We have a number of NOS cushions at the RCA museum that are all foam. Never had to drive more than an hour on them, but the thrill of driving these vehicles negates any derriere pain.

[Lynn Eades]

And then there is the issue of open cell foam and closed cell foam, and the difference between the "old foam rubber" that had resilience(bounced back) and the cheap foam that collapses under load and stays collapsed. I agree with Rob's first comment. there are many types of foam rubber.
In a CMP, a person with the genetics of a Dutchman may not need thick rubber. He might much prefer a thinner cushion of superior quality.