RE: [bolger] Trim to retain seat cushion
Slightly off subject—In my neck of the woods, kids start playing baseball in January and dutiful parents get to watch while sitting on aluminum bleachers. When it is in the 30’s (about 0 C), the bleachers never get warm and sitting is uncomfortable. A solution is a back packers’ ethafoam pad. Putting it on the bleachers will keep you warm and attract as many friends as can squeeze onto it!
From: firstname.lastname@example.org [mailto: email@example.com ] On Behalf Of Douglas Pollard
Sent: Saturday, April 28, 2012 11:22 AM
Subject: Re: [bolger] Trim to retain seat cushion
Along this same line of thinking. After we moved off our boat I bought myself a rocking chair that I thought might simulate the motion of a boat and put a one inch cusion on it. ( pretty stiff ) This seemed to stop the hip problems I was beginning to have with hip and leg pain. Now my wife has one, for the same reason with the same results. For several friends who have elderly family members I bought used rocking chairs and lowered the seat so that the seat did not cut them in the back of the legs. All I can say is help them or not they are enjoying them. I go to a doctor a couple times a year for low circulation problems in my legs. My Doctor is amazed that the problem has greatly diminished. I modified a rocker for one of her patients. My doctor claims I can likely thank my history of smoking (which I no longer do), for my circulation problems. I think this is a health thing that being on a boat with it's movements and the right kind of cushions might prove to be good for us all. This of course is all speculation. Doug
On 04/28/2012 10:34 AM, Roger Padvorac wrote:
Doug, this is really interesting. Now I know why I never liked thick soft cushions - thanks.
I sit comfortably for many hours a day on a computer chair with fairly thin, but stiff foam. On a wholesale level a major factor in the cost of foam is its weight because a foam that is twice as dense, has twice the expensive chemicals in it, and so costs twice as much to produce and then to ship as light foam does.
Cheap cushions have very light foam, don't provide much cushioning, but look thick and substantial and so sell well, especially because of their cheap price.
A thinner, but denser and stiffer (and more expensive) foam, will still provide adequate cushioning, and it will be less likely to squeeze the tail bone nerves because its dense and stiff and doesn't compress nearly as much as light foam does.
The best cushions use laminated foam, where you have a very thin layer of very soft foam (maybe 1/4" thick) on the outside, and then a thicker layer of stiffer denser foam on the inside. The most expensive cushions will tend to have 3 layers of foam, all with different densities and stiffness. This is much like a shock absorber for a car where there is a little bit of soft give, and then as compression increases it rapidly gets stiffer.
----- Original Message -----
From: Douglas Pollard
Sent: Friday, April 27, 2012 10:18 AM
Subject: Re: [bolger] Trim to retain seat cushionEric,here are some thoughts on holding cockpit cushions in place. Trim that holds the cushions in place has a rendancy to bite into the backs of your thighs. These are worse if it has rained and the cushions have been removed. My wife has made many cockpit cushions. She puts two straps on the back of the cushion one for each snap. We put two snaps in the coaming and snap the snap cap to it that has been installed in this strap. This keeps the cushion from sliding off.
If they live aboard or spend long periods aboard many people develop hip problems. We found that sitting so much on foam cushions causes this sometimes. The cushions push up around the tail bones and squeeze the sciatic nerve. We have found that no cushions in the cockpit or some in the cockpit no thicker than 2 inches greatly reduces this condition. I know this sounds nuts but my wife has gotten high praise from some longtime cruisers for this piece of advice.