The Murphy Builders Site

Rick

Anyone trying to share free info sure doesn't need to apologize for a
minor discrepancy.
My excuse is a great line from the "Simpsons" about having a brain that
is full. It goes something like - every time I learn something new, it
bumps something older out of my brain - like the time I took that home
winemaking course and forgot how to drive....

Sounds like your two 5" springs are very similar to having one of the
10" springs. I am still surprised that they are not stronger.

thanks
Ken

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Ken

I checked my construction pictures, and I owe you an apology.
I used 2 - 5" springs. (The first sign of age is loss of . . . . .
.something)
I'm sending this picture directly to you due to the e-mail size limitation.
If anyone else would like this picture, e-mail me and I'll send it out to you.

Here's the data on the 5" springs.
Danly Heavy Duty Springs
Cat. #: 9-3220-26S
RATE - lbs. required to deflect 1/10th inch 108.0 lbs.
Total deflection recommended for long life 1081 lbs @ 1.00"
Total deflection recommended for average life 1351 lbs. @ 1.25"
Maximum operating deflection 1622 lbs. @ 1.50"
Total travel to solid 1935 lbs. @ 1.79"

Sorry for the confusion Ken.

Rick Ford
436R (I think)

----- Original Message -----
From: <klehman@albedo.net (klehman@albedo.net)>
To: (Murphy Rebel Builders List) <murphy-rebel@dcsol.com (murphy-rebel@dcsol.com)>
Sent: Tuesday, January 16, 2001 8:45 PM
Subject: Re: Die spring specs.


Hi Rick

Weird numbers. I know your gear works fine and does not sag very much
so something must be amiss with the spring specs or maybe my math.

If I remember correctly, the ballpark numbers were something like spring
force is 1.7 times the weight on the wheel, even at 1 g weren't they?
(The multiplier would increase somewhat as the gear deflects and changes
the geometry) Say 800 lb per wheel at one g giving maybe 1400 lbs on the
spring at 1g. ?? I would have expected a spring that gives maybe 4000 lb
or so force at full compression...

Ken

Rick and Cathy Ford wrote:

Maximum operating deflection: 1548lbs. - 3.00" deflection

Total travel to solid: 1875lbs. - 3.62" deflection

Under normal load, each spring is compressed about 1/2" - 5/8" while
the Rebel is just sitting on the ground.

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Well yes the total travel adds, but the force stays the same ie 1875 lb
will compress both springs fully when they are put end to end, or when
they are separate. You would have to parallel them or put them side by
side to double the force. Still a bit of a mystery there...
Ken

Rick and Cathy Ford wrote:

Ken

Taking a look at the numbers, remember you have to add the 2 - 5" springs
together and compare them with 1 - 10" spring.
The results are quite a bit different.

10" (2)5"
Total travel to solid 1875lbs. 3870lbs.
max. operating deflection 3.0"@1548lbs. 3.0"@3244lbs.
Total deflection for long life 2.0"@1032lbs. 2.0"@2162lbs.

As you can see Ken, the results are almost double.
The total travel to solid is almost the 4000lbs. you figured would be
required in an e-mail you sent earlier.

Coiled-up,

Rick
436R

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Ken

Taking a look at the numbers, remember you have to add the 2 - 5" springs
together and compare them with 1 - 10" spring.
The results are quite a bit different.

10" (2)5"
Total travel to solid 1875lbs. 3870lbs.
max. operating deflection 3.0"@1548lbs. 3.0"@3244lbs.
Total deflection for long life 2.0"@1032lbs. 2.0"@2162lbs.

As you can see Ken, the results are almost double.
The total travel to solid is almost the 4000lbs. you figured would be
required in an e-mail you sent earlier.

Coiled-up,

Rick
436R


----- Original Message -----
From: <klehman@albedo.net>
To: (Murphy Rebel Builders List) <murphy-rebel@dcsol.com>
Sent: Tuesday, January 16, 2001 11:57 PM
Subject: Re: coils springs

Rick

Anyone trying to share free info sure doesn't need to apologize for a
minor discrepancy.
My excuse is a great line from the "Simpsons" about having a brain that
is full. It goes something like - every time I learn something new, it
bumps something older out of my brain - like the time I took that home
winemaking course and forgot how to drive....

Sounds like your two 5" springs are very similar to having one of the
10" springs. I am still surprised that they are not stronger.

thanks
Ken

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Archives located at:
http://www.dcsol.com/murphy-rebel/archives.htm

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