First off, I would like to thank the designer/Alan and all the builders of the CS boats for sharing their advice on endless topics. I am making good progress on my CS 20 MK3 #21, I've almost caught up to Alan on his CS 20 MK3 and am feeling a bit uneasy since I've been following his build on google photos and soon I won't have any visual reference other than the construction manual. It shouldn't be a huge deal but Alan's pictures sure have been a nice reference. Not to say that all of your pictures have been very helpful too, because they have.
My question today is what is the best way to add and remove water from the ballast tank? I like simple, but at the same time convenience of operation at a the time of need is an important consideration as well. I liked the idea of using two andersen bailers one forward and one aft, but the dewatering of the tank at a minimum speed of 4 kts is a problem and having to open and close the armstrong hatch I guess is a little cumbersome. Personally I would think that the most common time to remove water from the ballast tank would be during low winds and thus slow boat speed and one wanting to row an empty boat. So I was thinking of using a bailer for filling and a manual pump for removing water, however the thought of taking the time to pump while trying to maintain course etc. when sailing short handed does not appeal to me. So I'm thinking an electric bilge pump to remove the water and a bailer to fill the tank. I haven't been able to find a reversible 12V bilge pump either which certainly might be the most convenient method for adding and removing water as long as one had the 12V power available. I went to the local Marine store to look at the Andersen Mini Bailer and due to the design of this unit I think it will only bail not flood?? It has a little flapper door on the front of the scoop permitting water from only exiting the unit not entering it. I guess maybe one could force the removal of that door now that I think about it?
As a side note I have also been contemplating what type of auxilary propulsion to use, I am planning on having the oars available as a last resort option. I've been searching the internet for a pedal drive system too which really interests me especially since there are a few non-motorized raid races I hope to participate in.
Anyways, I was curious as to what all your thoughts were on the ballast tank operation was? before I make my final decision.