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AKULA II SEA TRIALS

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AKULA II SEA TRIALS

Postby U552 » Sun Jan 16, 2011 5:42 pm

After a whole week without news, let's give some more:
On thursday I made a little test with the improved rudder: Too big. The hull tends to roll, specially when going at high speed. This test did'nt lasted too much because I had a failure with the new ESC, and went back to the base quiclky.
This morning a went back to the pond. It was a fine morning so we (me and other fellows with saling boats) had a lot of spectators. The AKULA impressed everybody. It's really a nice hull.
With the less enhanced lower rudder, the hull still tends to roll, but fewer.
She tends to surface when turning due to trimmed with top of the sail awash, but it can be counteracted with a few "dive" order to planes.
Ballast tank fills in ten seconds. Empties in ten also, but the hull still needs some more time to raise completely. A very real action.
Once the ballast tank if full, and with less than 2/3 ahead, she needs very few angle in the planes to dive or surface, and then it's quite easy to keep her under the water at periscope depth. (Let's see: It's quite easy when you learn to move your radio sticks as few and tender as you can. All you need is a little practice).
Turning radius is now good (3 to 4 lengths surfaced, only 2 dived).
I made a couple of "deep dives" (more than 1 metre), and have to say that she behaves nicely. The problem is the fear you feel when begin to loos her from sight. That's the moment you act on the controls too hard, makig the sub answer in an abrupt way.
Sorry no pictures aither this time. NExt there will be. I promise it.

Regards Juan Carlos.
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Re: AKULA II SEA TRIALS

Postby greenman407 » Mon Jan 17, 2011 1:31 pm

Thats an excellent turning radius for that boat for sure.
There are OLD pilots and there are BOLD pilots but there are very few OLD BOLD pilots. MAG
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Re: AKULA II SEA TRIALS

Postby GreyAkula52 » Mon Jan 17, 2011 5:33 pm

The Rolls Are Induced Because Of "Excessive Speed".
Slow The Boat Down and Ease Into The Turning Manuever.
You Will Find It Handles Better than You Had Hoped.
My Boats Are 1/3 Larger At 1/48 Scale.
Speed Runs Can Be Very Exciting..... :shock:
My Skipjack Rolled Completely On It's Side
During A High Speed Turn..... Result:
SUNKEN SUBMARINE!!!!!

Captain Andy
Andre S. Burgess, P.E.
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Re: AKULA II SEA TRIALS

Postby U552 » Wed Jan 25, 2012 3:49 am

Although poor in quality, there is a video with sea trials.http://www.youtube.com/watch?v=B0nx0ldG ... AAAAAAAAAA
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Re: AKULA II SEA TRIALS

Postby Rogue Sub » Wed Jan 25, 2012 9:02 pm

could always help stabilize the boat by adding more weight to it. I had to make a full flying lower rudder on mine to make it turn well but never experienced much roll even at full speed.
Kevin
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Re: AKULA II SEA TRIALS

Postby U552 » Thu Jan 26, 2012 3:42 am

I initially installed a lower rudder extension, and it made the hull roll when turning. Finally removed it and turning radius haven't worsened so much. Perhaps she is a little bit "tender" in rolling to starboard when turning to port at surface condition due to ballast display, but dived she's firm.
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