by wannabefree » Mon Jan 04, 2010 11:34 pm
The length of the strut, distance from the hinge, and weight of the hatch all impact the strength of the strut you will need. I went through three sets to find what I needed. Started with 120 lb and couldn't close the hatch. 60 lb wouldn't keep it up. 80 lb -- just right!
If you want to try to avoid the guesswork look on McMaster's strut page. It will give you a very simplistic way to calculate roughly what you need. Then go one notch higher.
There are some strut companies that have more sophisticated models for calculating the strut but I found them too hard to use. I'm no ME.
IMO, use a longer strut farther from the hinge. You will put less stress on the hinge and can use a weaker strut.
In anything at all, perfection is finally attained not when there is no longer anything to add, but when there is no longer anything to take away.
-- Antoine de Saint-Exupery