Increase Helm Power
(Alteration)
Reversible

Range:  10 feet
Components:  V, S, M
Duration:  1 day per level
Casting Time:  3 rounds per additional ton of ship
Area of Effect:  One ship's helm
Saving Throw:  Negates

This spell causes the towing capability of a helm to be increased. The casting time is dependent on the ship's weight in tons which exceed the normal towing capacity of the helm. It is possible to increase the towing capacity of a helm by multiple castings of this spell (at once or in sequence does not matter). Thus, it would be possible to significantly increase the towing capacity of a helm. Thus, if a casting time of 3 hours were to be used it would be possible to increase the towing capacity of a minor helm to 110 tons (20 tons per hour). It does not increase the helm's speed.
The reversed spell, decrease helm power, causes the towing capacity of a helm to be reduced by 1 ton per three rounds casting time. If the towing capacity of the helm falls below the ship's tons it does not function. It can be dispelled with a dispel magic.
The material component is the bone of a giant and a potion of giant strength for each ton of ship to be increased. For the reverse, a scroll with one enfeeblement spell per ton is needed. 

