nolatom
Contributor
Mundane - To charge batteries which we do often on passage etc.
Prudent - I always have the engine running but in neutral during any situation where I may need it at short notice to avoid a dangerous situation. I have no problem sailing back into harbour, along channels etc, after all it is a sailing yacht but prudence leads me to have the motor ready if there is a lot traffic about. Besides the batteries can always use more charge.
Sure - but if you are running the engine for any reason - even in neutral - you are a motor vessel, not a sailing vessel..
Not to belatedly pick nits, but Rule 3 (a) says a sailing vessel remains so, "provided that propelling machinery, if fitted, is not being used".
If I'm still sailing, but engine started and "ready" but hasn't been put in gear, it's not being "used", any more than a steam propulsion boiler with steam up is being "used" til the turbine/prop are rotated, so I think I'm still a sailboat. I wouldn't have to show a steaming light or conical day shape until i put her in gear and operate the shaft/prop, right?