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Old Jan 09, 2007, 01:49 AM
gas tires and oil
prplgoat's Avatar
malad, idaho
Joined Dec 2004
2,433 Posts
Help!
what's the difference in these motors?

recently got a gp siren and thought i'd get one of these multiplex motor/gearbox for it, but i can't seem to find the difference in the choices!
towers offers a
4T,6T
3G,4G,6G
soaring usa recommends a 4G for some hotliners so i thought it'd probably be the best choice!

marty
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Old Jan 09, 2007, 02:26 AM
The frigin Catalina wine mixer
flightmare's Avatar
USA, CA, Buena Park
Joined Oct 2006
599 Posts
3g=3 turns,geared
4g=4 turns geared
3d,4d,the "D"states that it is direct drive,
first # is the turns in the motor
higher the turns,the lower kv
480 4g 4,4:1 is a nice setup for the siren.108.00 can go wrong.dont go with that 37 amp esc that comes bundled with it,go atleast 60 amp...
see this
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Old Jan 09, 2007, 12:10 PM
gas tires and oil
prplgoat's Avatar
malad, idaho
Joined Dec 2004
2,433 Posts
oh ya, that calculator is great! thanks. i was going to get the one with the 37 amp esc,but whoa it's showing it'll be over 45 amps!
well if the 4T,4G,and 4D are all the same motor i'll get a 4T and 60 amp esc instead of the 4G/esc combo.
thanks for the help!
all i fly are slopers,but after last year, i need one with power for the days we get skunked!

marty
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Old Jan 09, 2007, 12:17 PM
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UK
Joined Sep 2002
987 Posts
You may want to look at this download table from the multiplex website:

http://www.multiplex-rc.de/cms/vorsc...nfos/motor.pdf

Brian
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Old Jan 09, 2007, 12:18 PM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
The motor is only rated for 30A. A 60A ESC is not much use.
..a
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Old Jan 09, 2007, 01:07 PM
Wie ein Floh - aber Oho !
Damske's Avatar
Antwerp,Belgium
Joined Dec 2003
179 Posts
It will handle 60 amps bursts...
Hotliners usually need 10 sec motor run max.
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Old Jan 09, 2007, 01:52 PM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
Efficiency at that power level will absurd. The max efficiency current is only 23A.
..a
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Old Jan 09, 2007, 02:14 PM
Texas Ranger
Neil Walker's Avatar
USA, CA, San Francisco
Joined Aug 2004
2,524 Posts
Andy, I don't know any motor in a hotliner that is run at its peak efficiency current, or even at its rated max current. If they were, you'd end up with absolutely huge motors in the fronts of these things. Take for example one of the best motors for a moderately-well powered 60" hotliner (or warmliner, depending on your point of view): A Neu 1105/2.5Y on a 4.4:1 gearbox. Typical setup for this motor is 400-500 watts, a 12" or 13" prop, somewhere in the 40 amp range, and it performs beautifully. I believe Soaring USA recommends this system for their 60" ships.

Yet look at Motocalc, on 3s this motor's peak efficiency will be at around 15 amps It's supposedly rated at around 300 watts max.

Have you ever looked at Hacker's ratings for their motors? And compared them to how people run them in reality?
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Old Jan 09, 2007, 02:54 PM
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rcelectfly's Avatar
San Diego, CA, USA
Joined Nov 2001
2,820 Posts
Neil,

Comparing NeuMotors and Hackers to the Multiplex motors is a big leap in high performance applications. Motocalc efficiency numbers are not very acurate at all. They leave a lot of factors which are critical out of their calculations especially when high currents are considered.

Chuck
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Old Jan 09, 2007, 03:01 PM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
To each their own.

I am fully aware that we push components beyond their ratings. Taking a motor rated for 30A and running it at 60A, however, is not what I'd call typical. I pointed out the max efficiency current to show that at 60A, you're almost three times that.
..a
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Old Jan 09, 2007, 03:29 PM
Texas Ranger
Neil Walker's Avatar
USA, CA, San Francisco
Joined Aug 2004
2,524 Posts
Well, look at the link that Brian posted. That's from Multiplex. There are a wide variety of setups in that PDF file, some of them over 500 watts and pushing 50 amps. That's from Multiplex.
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Old Jan 09, 2007, 11:36 PM
The frigin Catalina wine mixer
flightmare's Avatar
USA, CA, Buena Park
Joined Oct 2006
599 Posts
PRPLgoat,What year is that purple goat??
I run the Siren with a Multiplex 480g 4;4:1,with a 13x7 prop,3s lipo.I made the error in using that 37 amp multiplex esc ( Dont get me wrong,thats an excellent esc,actually made by CC for multiplex.Thats the rumor anyway)and after a 10 sec or so burst,2 or three of those,and the shrink wrap on the esc is about to melt,So go 45 amp or even 60..when you want to step up from warm to hot,
You can always use it in a hotter setup..
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Old Jan 10, 2007, 12:11 AM
gas tires and oil
prplgoat's Avatar
malad, idaho
Joined Dec 2004
2,433 Posts
my goat's a '68, 350 horse 400 ci,4 speed, 3.90 rear posi. restored it in '92, fun car. easy to get tickets though!
advice taken on the esc. i was going to get a 10 cell nimh 'cause of the $$ and i thought it might need the weight anyway. can always get lipos later i guess. i'm not really into e-power, but i could use one when the wind won't blow!

marty
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Old Jan 10, 2007, 11:56 AM
The frigin Catalina wine mixer
flightmare's Avatar
USA, CA, Buena Park
Joined Oct 2006
599 Posts
Ya, just mind the Cg on the Siren, with a big Nimh,I think it will be in your favor.Andy W did a great review on the Siren,pay close attention to the tail servo part..
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Last edited by flightmare; Jan 10, 2007 at 03:07 PM.
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Old Jan 10, 2007, 12:46 PM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
http://www.rcgroups.com/forums/showthread.php?t=356191 - in case you're looking..
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