bow thruster tubes?

[Jackphilps]

Hello there, fitting bow thruster tubes 200mm dia, just intrested in ideas or the 'correct' way to fit them?

[Submarine Tom]

Athwartship at the bow...

[Jackphilps]

oh sorry, bow

Originally Posted by Jackphilps

oh sorry, bow

Ahh, ja.

This may become the most informative thread since the invention of foot powder.

We just must try hard enough.

[daiquiri]

Originally Posted by Jackphilps

Hello there, fitting bow thruster tubes 200mm dia, just intrested in ideas or the 'correct' way to fit them?

Check this Vetus manual I've enclosed here. You should find the info you need. You can see some informative pics in this site:
http://www.cantierelatino.com/instal...a_di_prua.html
The site is in italian, but I think those pics are pretty clear even without translation.

[gonzo]

It depends on the hull design. Is it a displacement or planing hull, etc.

[jehardiman]

Originally Posted by gonzo

It depends on the hull design. Is it a displacement or planing hull, etc.

I concur with this. You can easily double or triple the drag penalty of the tube by improper placement as well as give yourself a living nightmare of a structural problem. The best case would be to see if the hull designer/manufacturer had already done the work and has recomendations. 20cm is not a small tube to be putting in one of the most highly loaded areas of a vessels structure. Tabbing and reinforcement will be substantial on a glass boat and weld joint design critical to prevent cracking on a metal one.

[Jackphilps]

Its an aluminium boat and it has double bow thrusters. i have dimentions and and the tubes ready, thats not the problem, just looking for advice into the correct way to fit the tubes, to get them installed as accurate as possible. If there is a method or procedure?

[jehardiman]

What type of boat, bow shape (V, spoon, or other), and speed? My gut feeling is to recommend a shell insert just to resolve weld and strength issues as well as improve thrust output. Depending on speed and slamming, just using a corner weld (C2v.2) for the tube/shell connection is not the best way.

[gonzo]

Depending on shape and speed, a fairing may be adviseable.

[Jackphilps]

What type of boat, bow shape (V, spoon, or other), and speed? My gut feeling is to recommend a shell insert just to resolve weld and strength issues as well as improve thrust output. Depending on speed and slamming, just using a corner weld (C2v.2) for the tube/shell connection is not the best way.??


v hull, the rest of the information is not needed. Everything else has been designed, shell insert allready in place, as is said i have dimentions, all i want to find out is how to cut the hole's for the tubes accuratly, so they sit level and paralell. Is there a tool i can use, is there a method ? sorry if im confusing people.

[Jackphilps]

im looking for advice from a builder

Jack,

you would have had advice from a builder, if you would provide the info requested!
But when the "rest is not needed" to quote you, it will be hard to get what you look for!

Regards
Richard
boatbuilder

[gonzo]

If you need instruction on how to cut a hole level and parallel, this job is way over your head.

[Frosty]

I saw a tip section in a magazine on how to cut the hole level and parallel.

It was surprisingly easy and obvious with little tools.

Every thing is easy if you know how to do it!!

Fairing is always advisable. Keeping the tube deep enough is important --I seem to remember 1 foot min ( I dont know where I got that from) but some power boats will be able to plane with it out of the water which would certainly give you peace of mind that it wasnt dragging you down.