Controlling a wingsail is easy and can be done from a sheltered internal control station.
On Larinka the helm has two controls, one for the tail and one for the leading part angle.
there is no computer control although that would be easy to install.

The two controls are used to tack the wingsail and control the amount of thrust.
In all the weather we have experienced on Larinka I never had to put on my helm,
on watch, with a cup of tea in a dry environment.

We were not subject to the usual fatigue of an external cockpit situation.
Without a computer the fail safe mechanism is the concerned watch keep when conditions become extreme and the boat speeds up, it is normal to reduce thrust.

It is still a boat and in several instance we reduced boat speed through some challenging conditions.
And this can be done from the internal helm position.

Larinka recently experienced 50 knots of wind, Joe the skipper reduced the leading part to a zero angle (wing parts in line) and put on just 1 degree of tail (the aero rudder).
Larinka proceeded at 5 knots under complete control.

I have been on board in extreme conditions and it is reassuring to have so much control.
When all the wing parts are in line the aero drag is much lower than masts and rigging.
This is the zero thrust condition; the sail has been put away.

The Ashington and Blue Nova (other wingsail boats) had computer controlled wingsail and Blue Nova did have a manual system if the computer system failed.

The only limit on wingsail is the fixed area and this does become apparent in extremely light winds.