Oscar Continued

[Hazegry]

Thanks guys I appreciate it I am hoping to use one as a visual aid when I check into my next command (I am big on my guys being on the fire party and knowing their DC stuff this might help drive home the why we train so much)

[greenman407]

PeterW found some excellent High resolution plans. After he went to all that trouble, I thought it only proper that I would zoom in on the nice crisp details and extract some images of the plans. Thanks Peter.

[greenman407]

[greenman407]

Another one in this series, the bow light. I didnt know, until I looked at this drawing, that it folded down.

[Peter W]

we live and learn Mark. I also have 2 sides of a kilo plan and what I think is the Akula III Gepard as a set of plans.

Peter

[greenman407]

Nice stuff. Whenever you get afew spare moments, if you are willing, you could email them to me. I would then Graciously take them off your hands.:biggrin:

[greenman407]

[greenman407]

As I recall, this thing steers like a pig. How about we do something about it. I am chewing on something................Im thinking of installing bow and stern thrusters. For the purpose of enhanced mobility. HOW? http://www.ebay.com/itm/290948150859...84.m1497.l2649

I ordered one of these. When it arrives and seems suitable, I will put one on each corner of the boat and put a exhaust port facing to the outside. When I want to move away from the shore I can engage two on the same side to push it away. When I want to turn to port, in addition to the rudders ,I can engage one on the port rear and one on the starboard bow. Ill also need to electronic switches and two radio channels.

[roedj]

Perhaps it might help to ask Kevin McHale about this idea. As I recall, thrusters have been tried on the 1/96 model of a Typhoon and while they had some effect while the sub was not moving forward they had very little effect while underway.
I'd ask around before spending time and money on this idea.

Dan

[trout]

I read a thread on a different forum with Skip Assay about this very topic regarding the Neptune SB-1. Skip said the same thing with any forward motion (or reverse I assumed) the thrusters were not very effective, but with out that motion it would work. So this guy argues with him about it and builds it into his Thunder Tiger and guess what? Skip was right. Sofor pulling away from the dock or shore or meneuvering back to dock, perfect. Turning radius small at stand still also a yes. Other than that increase rudder surface area (or add a clear attachment to the rudder) might be a better move.

[Subculture]

How about an azimuth thruster?

Best to build boats with an aspect ratio of 8:1 or under if you want them to turn well. Copy the fish, they've had it sussed for millennia!

[reddevil]

Keep in mind the huge underwater ammount of hull this baby has. Unless the thuster is VERY powerfull, its effect won't be noticeable, and less at high speed. In full scale ships, thrusters are only used at low speed (under 3 to 5 knts.) My own proffesional experience at sea confirms this. With my supply ship model, as its thruster is quite powerful, I can make thight turns even at high speed. It's a ROBBE one.

[vital.spark]

Similar situation with the Seawolf. The turning radius sucks! (aprox. 20') I tape a extension on the lower rudder for a slight improvement. (aprox.15') It would be interesting to find out what the real life Skippers have to say about these subs?

[reddevil]

Have a look on ENGEL's web page about side thrusters. Regarding the real ones turning radius, I have commented about with some Spanish Navy submarine officers and the say that there are two things to be considered: 1. Rudders AHEAD propellers. 2. And which is more: part of the rudder OVER the water when surfaced. These makes they all miserably maneuverable when surfaced. Remember they are thought and designed to give their best performance UNDER water and at quite high speed. Mostly all of them have a poor turning radius when surfaced. That's why they all berth and unberth asisted by tugs

[KevinMc]

While I can't speak to how effective thrusters may or may not be, I can speak to independant control of each of the screws - At medium and low speeds it'll turn your pig into a ballerina. I put an ESC on each screw on my OSCAR about four years back and initially crontrolled them from indepenant controls on the transmitter. This got me a great deal of control over the boat, but was a real challenge to manage. (Constant coordination of two throttles and the rudder was a lot to manage.) Later still I came up with an custom X-tail mixer specifically for driving twin screws (Throttle Jockey) and that took the added workload away. I could parallel park my OSCAR if I had to.

I don't recall if you've got independant control of your screws now, if not I dare say that adding that would be less work then adding thrusters.