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        Mabuchi S400 Model Numbers Again?

#1 wim5150 Jul 09, 2004 01:11 PM

Mabuchi S400 Model Numbers Again?
What are the Mabuchi model numbers for 6V and 7.2V speed 400 motors?

#2 Hobbygroup Jul 11, 2004 12:31 PM

Mabuchi Does not make single voltage motors they are in a range i.e. 1.5-3V, 3-6v. They also have High and low rpm motors but I found out that the SH400 series is a pretty good motor, for up to 3S packs.

#3 Bruce Abbott Jul 12, 2004 03:40 AM

1 Attachment(s)
RS-380PH-5020 = Graupner #3320 Speed 400 4.8V
RS-380PH-4535 = Graupner #3321 Speed 400 6V
RS-380PH-4045 = Graupner #1794 Speed 400 7.2V

The last 4 digits of the Mabuchi code refer to the wire diameter (eg. 45 = 0.45mm) and number of turns per pole (eg. 35 = 35 turns).

#4 wim5150 Jul 12, 2004 07:50 AM

Bruce, Thank you!

This is very good info!

Much appreciated!

Gets me to thinking though - can a brushed motor be re-wound to get better performance?

#5 wrenwright Jul 12, 2004 10:35 AM

I bought a couple of Mabuchi RS-380 motors off ebay that don't have any other designation other than the rs-380 and a serial number.
I took one of them apart and they had about 72 windings per pole. They didn't seem to be very powerful and would require about 10 cells to do anything with a 6x3 prop DD.
Any comments/suggestions?

#6 vintage1 Jul 12, 2004 06:49 PM

Try 20 cells ? :)

#7 Bruce Abbott Jul 12, 2004 07:59 PM

They are probably RS-380PH-3270. This motor has maximum efficiency at about 2A, and needs 14V to match the performance of a 6V Speed 400 at 7V.

They could be useful in a large multi-engined model, eg. a B-36 Peacemaker might have 6 motors running on 16 cells, drawing about 30A total. The advantage of high voltage motors is that they can all be wired in parallel, which is more reliable and less complicated than a series/parallel combination.

#8 wrenwright Jul 14, 2004 10:53 AM

How do you recon these motors would do in a twin with, say, a couple of 6x3 props DD? How many cells would I need?

#9 wrenwright Jul 14, 2004 01:20 PM

Wired up the motor with 10 1300scr's and got 13,000 with 10x3. Seems like it doesn't quite match up with the 3270, as motocalc predicted only 11,000 with the 3270 and 10 cells. Maybe I'll see what 16 cells does.

#10 vintage1 Jul 14, 2004 02:50 PM


Originally Posted by wrenwright
How do you recon these motors would do in a twin with, say, a couple of 6x3 props DD? How many cells would I need?

I reckon 5-6s LIPO, or 16-20 cells basically. But very low current cells - n=maybe 700mA/h or so.

Problem might be finding ESC for them.

#11 wrenwright Jul 14, 2004 04:54 PM

I think the practicality of this proposition has reached about nil that this point. :eek:

#12 Hotnewton Jul 14, 2004 10:46 PM

I wanna find out some nice 500 euqal motor (Blushed motor) Which is best one please recommend for me~

#13 vintage1 Jul 15, 2004 02:42 AM

Best 500 class brushed motor is probably astro cobalt 05.

#14 wrenwright Jul 22, 2004 09:12 PM

Anyone know a supplier in the US that carries the various Mabuchi motors like mentioned above (RS-380PH-5020, et al)? Especially interesting to me is the 4.8V motors. Paying Hobby Lobby $16 for a $2 motor is too much to bear for this tightwad.

#15 Bare Jul 23, 2004 12:56 AM

Sometimes you can find the Mabuchis at an Electronics Supply House.. usually for $2 or $3.. but supply is 'iffy' and I've yet to spot a 4.8v variant.. 6 v are Rare enuff :-).
Could try rewinding.. it's definitely not Rocket Science.. and with a Magnetic Balancer you could actually Balance the Finished Armature. Few of which come from the Factory Balanced.. BUT some do.. look for the green blobs of Epoxy on the windings :-)

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