DesertApprentice wrote:The standard drawing shows the structs lean in a forward position when fully extended.
Since my hatch is relatively vertical, following the formula, my struts would lean backward when fully open, see the red line in the illustration.
Do all the calculations still apply?
Thanks a lot!
hatch-struts.png
* Finally, someone with a vertical (or nearly so) hatch on the forum again; I thought I was the last one to try to use a gas spring on a (home-built) squareback. I started out just lifting the hatch by hand, holding it up with one hand, then inserting prop rods and raising it to a steeper angle overhead. That grew to be a pain over time, so I wanted mechanical help. A linear actuator was my first choice, but wasn't happy with the prices, so I ended up using a gas spring.
https://www.tnttt.com/viewtopic.php?f=21&t=61432* I tried this "Hatch Gas Spring/Strut Calculator", but lost track of the results (due to computer errors), then went off on a tangent, trying other calculators, and ended up using a combination of math and trial & error
https://www.tnttt.com/viewtopic.php?f=21&t=69023#p1211649. But, it works, lifting my hatch up to where it floats at 90 degrees (unless the weather's cold, and then it still floats at 45 degrees open), and is real easy to lift the remainder of the way, to my chosen angle (105 or 110 degrees, depending on the ground height, so the hatch is out of the way ...and head-bumping height), using small prop-rod extensions.
* I never tried this calculator after that to see how it would've ended-up, but the initial calculations came up with 125lbs to lift it, but that was for a curved hatch (I presume), since later calcs on another site said 150lbs x 2 gas springs. I ordered two. Once installed, yep 2 x 150lbs springs would've lifted it almost vertically, not to the 90 degree level position I desired (plus, I'm sure that trying to close the hatch overcoming dual 150lb springs would've created another problem, probably with my back or the plywood mounting points deteriorating). As is, a single 150lb spring, mounted nearly in the center of the galley shelf, does what I wanted, and I have the other spring leftover as a spare.
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