DCMoney
Goblin Guru
I bet the electric actuators car companies are using are lead screw so they are self locking. That way without power it holds.
I've used the link below model at work on a few projects. One in the link will put out 400 pounds of force at almost an inch per second in theory. Real world date gave us 32 seconds to full extension on a 24" stroke, and 52 seconds to full retraction at 24", running the actuator at 12.8 volts with 200 pounds hanging from it. These linear actuators are acme lead screw and will not move without power. Not astronomical in price either.
https://www.progressiveautomations.com/linear-actuator-ip66
I've used the link below model at work on a few projects. One in the link will put out 400 pounds of force at almost an inch per second in theory. Real world date gave us 32 seconds to full extension on a 24" stroke, and 52 seconds to full retraction at 24", running the actuator at 12.8 volts with 200 pounds hanging from it. These linear actuators are acme lead screw and will not move without power. Not astronomical in price either.
https://www.progressiveautomations.com/linear-actuator-ip66