less weight or add foam?

[kmobley]

Starting to trim my U47, pretty low in the water to start with supplied weight. Decks wash.... I need to raise it a bit, is it better to remove some weight or add foam to raise it up?

Any advice would be great.

Kyle

[bob_eissler]

I would add foam because it will make it more stable. If you are talking about the Robbe kit, it is designed to be almost deck awash since it is a dynamic diver.

[kmobley]

Perfect thanks, yeah its a little deeper then before I redid my tech rack. less air in the wtc, I'll try just a little foam. Thanks

Kyle

[JWLaRue]

Adding either foam or weight can make it more stable. In general.....since you are building the U-47 as a dynamic diver you are going to end up trading off adding more foam (more freeboard) causing the boat to need a faster speed to submerge vs. more weight (lower freeboard) causing the boat to need a slower speed to submerge.

Since we're talking about a Type VII U-boat, I would recommend that if you choose to add foam to try to place it in the saddle tanks as that will provide the best roll stability.

-Jeff

[kmobley]

Great advise Jeff, thanks

Kyle

[bob the builder]

The good thing about those dual prop fleet boats is that you don't get torque-induced roll like the single prop boats with a big central propeller. You can get away with less static stability (though having it is always a good thing).

[JWLaRue]

...roll, roll, roll your boat gently down the stream...!

-Jeff

[sam reichart]

The good thing about those dual prop fleet boats is that you don't get torque-induced roll like the single prop boats with a big central propeller. You can get away with less static stability (though having it is always a good thing).

you mean you don't like your Skipjack using the sail as a dive plane?

[crueby]

you mean you don't like your Skipjack using the sail as a dive plane?

I thought they had rudders top and bottom so you could use them in a full roll?! 8-)