how to mount large size electric motor. Radial or Cage mount?

[drstillpatient]

I'm in the middle of installing a 5330 size outrunner motor and i can mount it either way, radial or cage mounted. What do you guys suggest is the better way to mount it so it holds well during violent maneuvers? thanks

[sun.flyer]

I'm in the middle of installing a 5330 size outrunner motor and i can mount it either way, radial or cage mounted. What do you guys suggest is the better way to mount it so it holds well during violent maneuvers? thanks


What plane are you mounting the 5330 motor in?

Tim

[drstillpatient]

What plane are you mounting the 5330 motor in?

Tim

Its a 75" Ultra-RC Katana

[hermperez]

there are also weight considerations.. the esprit cage mount is bulletproof but also nearly 2lbs.. I say build a large box out of lite-ply and radial mount it.. keep the prop light.

http://www.espritmodel.com/index.asp?PageAction=VIEWCATS&Category=729

I think the plates are 1/4" aluminum..

Hopefully on a crash the box will sacrifice itself and save the motor and fuselage.. make it out of 1/8" lite ply with hard points to screw the motor to..

[SHELBY1]

Something else to consider. Noise. Big motors on metal mounts, especially with lots of open area in the cowl can really get noisy. The light metal mounts don't do a lot to dampen noise, and the big old hollow area inside the cowl tends to applify the noise.

[jrb]

Here's how I'm going to mount a 6330-230 in my 1/4 Cub ( http://www.rcgroups.com/forums/showthread.php?t=752795 ).

That's 3" of 3" PVC and 10-32 bolts

Have kept the hangar/build rash to a minimum by working mostly in the vertcal!

[drstillpatient]

Here's how I'm going to mount a 6330-230 in my 1/4 Cub ( http://www.rcgroups.com/forums/showthread.php?t=752795 ).

That's 3" of 3" PVC and 10-32 bolts

Have kept the hangar/build rash to a minimum by working mostly in the vertcal!

That PVC mount seems pretty innovative...i've decided to go with a radial mount with my motor and am getting aluminum spacers made for my application. I am looking to save weight as well.
The thought behind asking the question was to get opinions if there was "the ideal" method of mounting a large outrunner motor because of the higher torque, higher gyro effect from the spinning motor and the prop and other forces that come into play.
Would a radial mount bend during a high throttle tumble or snap roll etc as opposed to a cage mount

[hermperez]

I would think the radial mount would be ok, but the stress will be on the stator portion of the outrunner.. where the windings and bearings are.. a cage mount would better support the motor since the motor is held closer to where the prop is. I would use a light wood prop..

[drstillpatient]

I would think the radial mount would be ok, but the stress will be on the stator portion of the outrunner.. where the windings and bearings are.. a cage mount would better support the motor since the motor is held closer to where the prop is. I would use a light wood prop..

A wood prop of say 20" will be lighter than a similar diameter APC-e prop?

[tIANcI]

Home made aluminium stand offs ... works very well for my 5330 equivalent. Big washers are necessary on the firewall end to keep things solid with a larger base :)

[hermperez]

yes, much lighter and stiffer.. try the new Zinger Pro series.. I also like the MA wood props.

A wood prop of say 20" will be lighter than a similar diameter APC-e prop?

[drstillpatient]

Home made aluminium stand offs ... works very well for my 5330 equivalent. Big washers are necessary on the firewall end to keep things solid with a larger base :)

Yup, thats what my setup should hopefully look like, if the stand-offs come out ok. What size prop is that?

hermperez: will be ordering a few wood props today to experiment with.

[tIANcI]

Yup, thats what my setup should hopefully look like, if the stand-offs come out ok. What size prop is that?

hermperez: will be ordering a few wood props today to experiment with.

I am turning a 20x10 ... no torque effect when I put on the big washers. Before I used the washers you can see the stand offs twisting because of the torque ... guess the base was not stable.

Guys ... help me out here, are the wooden props better than the APC E props? Thanks!

[drstillpatient]

Guys ... help me out here, are the wooden props better than the APC E props? Thanks!

From what i've read and seen, the APCe props flex too much at high speeds loosing some efficiency. there might be more to it

[tIANcI]

I have to try out some wooden and CF props ... everyone seems to be into the XOAR ones ... fashion & marketing or are they that good?

[Jocke]

I would say it all depends on the motor, if its designed for it then yes, radial mount is better, but most motors, cheper ones dont have full suport of the bell, then radial is no good and you will end upp with motor heat, osilation, wibration, bad bearings or trowing magnets, if the motor have a good design that suport the bell, radial mount is the better way, lighter simpler installation, better cooling.

[jrb]

Interesting comment about “E”’s and flex!

I know I hear flex/flutter of these when I wouldn’t expect to; and am really wondering if I should do something differently for my Qtr Cub???

Though I must say that the worst prop I ever tried on my 1/5 (80”) Cub was a Zinger!

[Jocke]

I never use APCE on setups over 1,5kw or 18", they flex!

[tIANcI]

No APC Es for over 1.5KW ok ... got it ...

[hermperez]

The original Zinger props were horrible, but the new Pro series are pretty good, try em..

I would say no APC E props over 1000watts..


Though I must say that the worst prop I ever tried on my 1/5 (80”) Cub was a Zinger!