RE: Electric Jackscrew
John :
Mine is set up the way you mentioned in your first message with a DP DT toggle switch operated by a servo, and a microswitch on either end of the screwjack as stop switches. They are self contained out in the wings with their own two cell packs charging jacks included. The planetary gearbox is 1 1/2 in. dia. driving a 3/16 24 threaded rod at a nice scale speed. Hope this helps.