Seaview

[Albion]

Does the speed make much difference to a model submarine? It's a log in the water at best.

yeah, more amps

[Kazzer]

yeah, more amps

AH! I guess I'll get Mr. M to do his amp stall test on these new motors, so we have a definite amperage result on them.

(Something I forgot to get done)

[Subculture]

Does the speed make much difference to a model submarine? It's a log in the water at best.

If the difference was a within 500RPM I'd say no, but with more than 50% increase RPM, it will make a big difference. Depending on the props and/or gearing being run, the motors may bog down and overheat, and as Albion pointed out draw a lot more current. It would be an excellent motor for converting an old 3.0 SD to 12 volt operation though as the RPM matches up very well with the 7.2v speed 400.

[greenman407]

OK, now, this will be the $5000.00 question. I use both port and starboard motors independantly to help steer this thing and turn it around. Can a brushless motor go forward and reverse?

[trout]

My quick answer is Yes, you will need to make sure the brushless ESC does reverse.

[Subculture]

Be aware that brushless motors don't answer quite so quickly to reverse commands as their brushed equivalents. They have to be stopped first then restarted the other way, so there is a slight (and I do mean slight) delay.

The brushless ESC I linked to in an earlier post is reversible.

[greenman407]

Subculture, can you provide the link again to the ESC and the motors because I cant find it. Thanks

[Subculture]

Post number 12

http://forum.sub-driver.com/showthread.php?1723-New-3-quot-SubDriver-Under-Development/page2

BTW, that was just an example, plenty of other options on that site.

[greenman407]

Ok Thanks I got it.

[greenman407]

This video was taken back in 2008. It was around the time that I was having a lot of trouble with the Seaview. It was eventually traced to incompatability between the onboard electronics and my Futaba PCM radio. After I purchased the Polk Tracker I have had no further problems.

http://www.youtube.com/watch?v=G0wuqfXUMco&feature=g-upl&context=G2097f77AUAAAAAAADAA

[greenman407]

This one follows the other one as she was shown here misbehaving but operating nonetheless. These videos wont win any prize but lets be realistic, they wernt being made with that in mind.

http://www.youtube.com/watch?v=bl8l_r_jxx0&feature=g-upl&context=G22562aaAUAAAAAAACAA

[greenman407]

The time has come to help the turning radius of this boat. Im going to make two add on rudders sized 1&3/4" long and 7/8" wide. They will be CAed ,one on each side of the central rudder underneath. By installing two of them it will form a trough that should increase their effectivness. The only downside, other than not being part of the original design, is that they will hang down below the keel a little bit. So unless I want to plow some furrows, Ill need to keep it up off the bottom.

[Rick Teskey]

Have you tried seperate speed controls and linked them too the rudders for differential steering?
I know Kevin makes a throttle jockey for this application.
Rick

[greenman407]

Oh yes Rick, that part works real good. I do that manually or I can sit still and swing her bow around ,NO PROBLEM. This is to reduce the turning radius when using the rudders alone.

[greenman407]

As can be seen from the pictures, this boat is steered by the action of the water coming from the props over the rudders behind the propulsion tubes. As those rudders are configured now ,only part of the water stream can act on the rudders. If the rudders were hinged in their centers, then the rudders would be affected by the entire water stream. The center rudder is very small and pretty much hidden by the hull to the flow of the water. What I am doing is extending that rudder down into the flow of water beneath the hull where they will do more good.