Harrier swivel nozzle?
In the four swivel nozzles the fan/turbine exhaust is turned ~90 degrees. Changing the momentum of the air from horizontal to vertical requires a force on the air pointing inboard at 45 degrees down from the horizontal. Sir Isaac arranges for an equal opposite force on the nozzle: 45 degrees up from the horizontal and outboard. Each nozzle supports about 1/4 of the aircraft weight in the hover, so the thrust acts up through the nozzle hinge with ~4000 lb of force, and also tries to rip each nozzle off the aircraft with ~4000 lb. I reckon you could probably get an insight from the force required to hold a sharply bent firehose steady.