R/C Naval Combat

Mikey,

I can't remember -- are you using gear reduction? I would imagine that with gear reduction those two Wah-Mings will work just fine...

Carl

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Originally posted by froggyfrenchman

The motors that I have in her at this time are Wah-Mings (12 volts), very efficient. They do get her up to speed just fine, but I have to admit that I have been looking for something larger, in the way of motors, just because they look too small for the application.
They have been just fine for all of the trials so for.
I used them in my small-gun Jean Bart (24 seconds). She is around 38 lbs.
The Strasbourg will be more like 70+ lbs, but is also slower.
So to make a long story even longer. The Wah-Mings seem to be doing fine, but I plan to replace them with something bigger, if I find something.
Mikey

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Carl
I haven't been posting here for quite a while. Been too busy. But it is that time of the year again, and I jope to get back to working on her.
I have been looking at a new gear drive set-up from B/C that can have two motors driving one shaft. I plan to order a couple of these little beauties, and install them in her so that I can continue to run the Wah-Mings (which I really like), but also run only the inner shafts (to help with her turning), but also have four motors.
I hope to be able to post some new photos in the next week or so. I haven't made much visible progress, but if anyone has any questions about what's already there, I can concentrate on posting photos that will help answer any questions, as to how I set her up.
Mikey

Hey Mikey,

Good to hear from you! Hope you had a Merry Christmas and a Happy New Year!

I have a couple of questions about using two motors to drive one shaft. First, since the two motors probably try to turn at different speeds even at the same voltage, doesn't tying them together onto one shaft increase their power consumption? Second, do you really need that much power (two motors on one shaft) for the Strasbourg? If so, I may need to use bigger motors than I was thinking for my Shimakaze...

Carl

Carl
Happy new year to you also.
As to the Strasbourg drive-line stuff.
That is sort of a trick question about the motors.
The Wah-Mings are really nice motors. They draw next to no current,
but also don't have a lot of horsepower. They are about the same size as a typical 550 motor, but are nowhere near as powerful.
I have had the Strasbourg out on some pretty extensive sea-trials, and they
have not given me any trouble so far, but I think that pushing around a 70+
pound ship even at our relatively slow speeds would be asking a lot of them.
I do not think that hooking two motors to a single shaft is the best way of getting the job done, but I have battery power to spare, so that may be the way I go for the time being.
Of course, I am going on theory here, as I have never built anything this big, or heavy.
Now in the case of your DD.
In theory. It will be about the size of a heavy cruiser in big-gun format, and will run the speed of a really fast heavy cruiser, so we can look at what those guys are running, and go from there.
If I remember correctly. I was running Wah-Mings in my Suffren, and Tourville
in big-gun, at 7.2 volts, and could run for a nice long time.
Tourville ran two shafts and was perhaps 52-53 inches long, and weighed around 12-13 pounds, and ran something like 32 seconds in the 100' course.
Mikey

Hey Mikey,

I was planning on using two Graupner 400 6V motors, one per shaft, with a 3:1 gear reduction on my Shimakaze. Joe Kutz was going to use this setup on his Gearings, although he recommend using direct drive on larger boats. I was planning on using two LiPo's @ 7.2V to keep the weight down, although I'll have to use a BEC to drive the Graupner 400s as they are 6V motors.

I didn't realize the Wah-mings were weaker than the 550s. The Wah-mings are probably more efficient from the sound of it. So you might need two of them per shaft if your big bad Strasbourg needs more torque. Hopefully my Shimakaze will be faster and more maneuverable than yours. [:D]

Now I just need some time in the garage to finish the dang thing...

Carl

Haha

That's just mean...[:D]

BTW, that looks like a Mogador deck. Is there a hull to go with it?

Carl

Carl,

The Speed 400 6v motors will operate ok on 7.2 volts, just faster. Heh. They won't melt under that load.

I'm working on a Mogador. It's power system will be a 4 cell 4.8v NMh pack powering a 4.8v Speed 400 motor geared around 3:1, turning 1" props. I suspect the ship is going to be too fast. If so, I'll swap the 4.8v motor out for a 6v Speed 400.

Mike,

Thanks for the tip. I know it won't melt, but it will generate extra heat, and I figure in Texas that having extra heat in your boat is a bad thing. [:)]

Are you making a one-off hull, or are you making a mold?

Thanks,

Carl

Actually, I picked up an old BC Mogador hull (at least I think it is a BC hull), made my own subdeck and decks, and ordered the turrets from BC. :)

Ah ... it's a 1/144 scale ship, so I'll pipe down and return this thread back to the discussion of a much larger, nicely done 1/96 ship. Heh.

It's a BC hull.

Sorry, but I just couldn't resist.
It is a Mogador. That is as far as I have gotten.
But you can't get finished, until after you get started.
Mikey

Mikey did you try those motors I sent you?

Dave
I have not taken the time to install them just yet, but plan to when the weather gets warmer up here.
I have been really busy working on my new boat-shop, but was able to make a little sawdust yesterday. It was nice to work on the boats for a change.
I will post some photos when I get a chance.
Mikey

Up-date on Mogador.
All ribs are drawn on wood.
All but the last 5 are cut out.
Aren't I a stinker??
Mikey

Yer a stinker!

So now we're getting a destroyer! Make a nice escort for Bearn :)