Thread: water ballast
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Old 06-11-2017, 04:28 PM   #3
Al
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City: ketchikan, Alaska
Vessel Name: 'SLO'~BELLE
Vessel Model: 1978 Marben-27' Flybridge Trawler(extended to 30 feet) Pilothouse Pocket Cruiser[
Join Date: Apr 2012
Posts: 2,206
Quote:
Originally Posted by Larry M View Post
I'd say no. 22 gallons of water only weighs ~183 lbs. Are there any hoses coming or going or a vent.
To the contrary, 128# in a 28 foot boat has a large impact. Our boat is 28 feet and mentioned in several past threads/post, we added a total 1400# of lead ingots to the already 1500# located internally of the keel at build. We did this to accomplish what the OP indicated 'Lively' action. In our case we lay 800# of the 1400# directly over the keel under the engine bed. We then added 400# toward the aft of the reduction gear split on each side. The remainder we used as adjustment factor. We purposely went out in fairly challenging water to see what different positioning of the remainder would reflect. The end result that gave the best sea kindness was placing one ingot [50#]under the anchor chain/rope. The next 50# is located under the forward bunks at the V. The last 100# was added to midship forward of the engine on either side of the engine bed stringers.
Prior to this placement, the boat would 'Hobby Horse" to a greater degree until the 200# was located, now we beat into head seas. I will also mention that with this weight in total, the boat as small as it is, rides vertical over wake waves, extremely less rolling there and in beam seas, head seas in any quadrant is as a larger boat in terms of reaction. Following seas remain the weak sector as it is with most square stern boats, yet even here there is a improvement to our mind.
If the tank is not a dedicated holding tank then is there one on the boat? If not the tank is for that purpose. If there is a different tank then the thought of using this as an adjustment for ballast holds merit.

Al-Ketchikan
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