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Question
G'day i realise that the hull is ideal for fast speed but was wondering what it would do at trolling speeds ,handling and fuel economy wise? i was wondering if you wer familiar with the water ballast concept for deep v hulls (like the surtee's boats built in nz) and if you think that would work in this hull to give more stability at rest
Answer
First the water ballast concept. The space where is free flooding and in engineering terms it is not ballast but free flooding. At speed the water drains out. When stopped the water floods in and the boat sinks lower in the water. Because the drain and flooding holes are relatively small the effect is the same as if it were ballast. In Naval Architect terms a ballast tank is one that is totallly internal of the ship or boat and has to be pumped out.
But I ask ask the question Why is it required?. It is required to correct a problem with 20 degree deep vee boats with a 2.5 metre beam while at rest or slow speed in that they are very ''flighty'' because the chines are often out of the water. Designs like the Haines Signature have corrected this by reshaping the underwater shape. For example the planing strakes were redesigned to cut into the moulds not added on thus reducing the buoyancy aft compared with the original hull shape. Also a relatively large step is fitted just forward of the motor
In other words you are better to design a better hull shape. The Sea Boat 15 degree does not have this problem. With the deep vee Bollard 129 you would be better off just putting a flat keel going from a point forwatd at about frame 2 to about 400mm wide at the transom. This would have exactly the same effect with out all the hassle
In any event Iam happy to design a floodable keel version tot the 129 at no additional cost, It will lower the boat in the water and make it a better platform to fish from. You would be very happy with it because the free flooding void space would do the job well
Rating:  [5 of 5 Stars!] |
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