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Power Systems Talk about motors, ESC speed controllers, gear drives, propellers, power system simulators and all power system related topics

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Old 12-29-2011, 12:59 AM   #1
Wildflyer
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Default Multiplex planetary gearbox, Removable ?

I have a Multiplex BL-480/3G motor with a 3.3-1 planetary gearbox on it.

The motor itself has a very high 4180KV, even with the 3.3-1 gearbox, it will be turning the prop at about 10K on a 2s battery, and about 15K on 3s

I would like to slow the out put down to swing a large carbon folding prop.

Their next motor is 3170KV, or their other gearbox is 4.4-1, either way I get down to about 7000+ rpm

Can this gearbox be removed and installed on a different motor, or are they a fixed unit?

Dave R, Proud PGR rider.
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Old 12-29-2011, 03:25 AM   #2
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I don't know the gearbox but I imagine it can be unscrewed from the threaded backplate which is itself attached to the motor by means of some machine screws.

As far as RPM go, remember that with a relatively large prop you won't get much more prop rpm than about 75% of Kv x v.

In your example, your 2s RPM might well be closer to 7000rpm, and your 3s RPM might be no more than 10,000rpm.


.... but certainly if you want lower RPM a 3170Kv motor on 4.4:1 would be the way to go.
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Old 12-29-2011, 05:14 AM   #3
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Thank you, Dr Kiwi

Boy, if that is the way it is mounted (I sort of guessed it might be)the person that mounted it must have used JB weld instead of locktite.

I am waiting for a new 2s battery, ESC, and 10x6 blades to try this thing out again.
My first test was shut down quick when I had over 400 watts at less than 1/2 throttle stick (1400 micro sec pulse) It had a 3s battery and 10x8 blades, that is how the first owner had set it up.

This a 300 to maybe 400 watt short pulse motor, it will be the unit for my Sky Sergio glider, right now it looks like I have to use a 10x6 but the watt meter will tell me.

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Old 12-29-2011, 05:51 AM   #4
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Gearboxes IMHO-R-A-PITA Sell the Motor gearbox assy. on EBay, and buy a direct drive motor, Brushless Motors are very inexpensive, and its not worth the hassel of trying to swap gearboxes, press on and off motor gears and get the gear mesh just right, Just my 2 cents worth, Take care and have fun, Chellie

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Old 12-29-2011, 08:03 AM   #5
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On this plane, a Sky Sergio 09 from Soaring USA, this type of motor is about the only way to get power needed to climb quickly. I will be flying in ALES or LMR events.

I could use a common 28mm outside dia outrunner motor, setup as a behind the firewall mount, only if I drill a hole and run the wires outside the fuselage, then back in behind the spinning case.
The body is only 29mm dia id at the firewall, and 35mm dia id, 2" behind the firewall. The 30mm spinner blends very well with the body tube, which is a Kevlar fiber unit.

I have been researching all possible drive systems for 2 months. There are other motors that could be used BUT they need to be shaped and wired like the Hacker B40 geared motors to fit in this thing.

This is the smallest motor area inside the fuse I have ever seen. These type motors are expensive, and I don't want to burn it up.

But if you know of a very inexpensive 28mm motor that will spin a large (12-14") carbon folder at 7000, I may just drill the holes for the wires, and put an air scoop around them. Thanks

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Old 12-29-2011, 09:41 PM   #6
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Originally Posted by Wildflyer View Post
On this plane, a Sky Sergio 09 from Soaring USA, this type of motor is about the only way to get power needed to climb quickly. I will be flying in ALES or LMR events.

I could use a common 28mm outside dia outrunner motor, setup as a behind the firewall mount, only if I drill a hole and run the wires outside the fuselage, then back in behind the spinning case.
The body is only 29mm dia id at the firewall, and 35mm dia id, 2" behind the firewall. The 30mm spinner blends very well with the body tube, which is a Kevlar fiber unit.

I have been researching all possible drive systems for 2 months. There are other motors that could be used BUT they need to be shaped and wired like the Hacker B40 geared motors to fit in this thing.

This is the smallest motor area inside the fuse I have ever seen. These type motors are expensive, and I don't want to burn it up.

But if you know of a very inexpensive 28mm motor that will spin a large (12-14") carbon folder at 7000, I may just drill the holes for the wires, and put an air scoop around them. Thanks
This motor on 2 cells will spin a 12 to 14" prop, the wireing will be at the back of the plane, it has a prop adapter that fits the can, and its a 28mm can size. this is an example at Heads up Rc, i know that your not in the States.

http://www.headsuprc.com/servlet/the...2C-28mm/Detail



7.4 volt x 1100 kv = 8140 RPM - 10% for battery voltage draw + prop drag = 7326 RPM APROX

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Old 12-29-2011, 10:00 PM   #7
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or these motors from HK on 2 cells

http://www.hobbyking.com/hobbyking/s...ner_Motor.html

http://www.hobbyking.com/hobbyking/s...ner_Motor.html

http://www.hobbyking.com/hobbyking/s...er_20_22L.html

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