1/96 Sea Wolf

[navy2000]

Going to start building my first sub, have done many surface ships now time for a sub. Could anyone give me any info has to what I should watch for while building. This is a hull from Scale Shipyard and Propulsion pod and other parts. Is there a special way to algin up the propulsion pod with the hull and so on. The rest of the control surfaces should be no problem at all for me.

Duane

[greenman407]

By saying propulsion pod I

By saying propulsion pod I assume you mean WTC. First you need to make two cradles to hold it in position and to do so without being able to move during operations. It is lined up on the centerline and should be mounted as low as possible in the sub. You need to find the center of gravity of the sub, from front to rear, without the wtc in the boat, then mark this position inside the boat. Then install the wtc so that the center of the ballast tank portion of your wtc is about 1" forward of your mark. this is a good place to start. If need be it should be fairly easy to move it for the purpose of fine tuning. To attach the wtc to your cradles most people use hooks mounted on the cradles and rubber bands. A single pin sticking up from the forward cradle can penetrate the wtc in the ballast tank area to keep it positively locked in.

[navy2000]

I guess what I should

I guess what I should of had said is the water jet propulsion pod at the stern of the sud, the part that covers the propellor.

Duane

[greenman407]

Oh, well I dont know

Oh, well I dont know about your Seawolf but my Trumpeter Seawolf there is nothing to line up. The whole assembly attaches to the hull foundations that are already in place, there is nothing to line up.

[aeroengineer1]

I do not mean to

I do not mean to be short, but I am not sure that you have done enough research to build your boat. The pod that you are referring to is called a propulsor/pumpjet. Lining things up should be no different than lining up a prop shaft for a regular boat, except that the propulsor (read enclosed propellor) is inside the shroud. If the shroud, propulsor, and shaft are not concentric, then you will have problems. If you have a good eye, you shuld be able to align these components within a few thousandths, if you do not, then It might be a good idea to build a jig on a lathe.

Adam

[anonymous]

It's not an easy thing

It's not an easy thing to do. You need to lay out reference marks top/bottom and port/stbd on both the fiberglass hull halves and the cast resin plug (assuming this is the way that Lee makes the boat). The topmost fwd stator should be in line with the upper rudder. After that it is test fitting and multiple measurements to make sure that the plug lines up with the reference marks *and* the end is square. The shaft can be used as an additional reference.

Then (and only then) do you epoxy it (do not use 5 minute epoxy) in place.

The shroud can be RTV'd in place once all is set.


Should look something like this when you are done...

[navy2000]

Thanks Chris

This helps me alot.

Thanks Chris

This helps me alot. When I was in the NAvy in Subs we did not have any subs with the pumpjet as some call it at that time. I was at the point inwhich I left the Navy when the Seawolf class was just coming out. I will be meeting with the Deepsouth group later this month for more ideas and help as well.

Duane

[anonymous]

No problem. Feel free to

No problem. Feel free to PM or e-mail with questions.