Wish I hadn't gone to that site.Now I see more stuff I want!LOL
If it is high-power AND you can control how far it extends, you could have it extend 1/2" in about 1 second and lever that to move something big.I am betting this thing is really powerful. If it takes 40 seconds to extend, I figure piston can exert at least 100 lbs of force. Likely more. Not sure what it could be used for. You could use a lever to move a prop a large distance. Like you say, it is slow.