EDF Balancer - Page 3 - RC Groups
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View Poll Results: What applications would you use balancing for?
helicopters 2 11.76%
Turbines 4 23.53%
Electric Ducted Fans 16 94.12%
Drones 2 11.76%
Aircraft Props 7 41.18%
Multiple Choice Poll. Voters: 17. You may not vote on this poll

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Nov 16, 2012, 04:21 AM
Good vibrations.
dynexhobby's Avatar

Cradle


Hi guys,

Here are some basic dimensions for the cradle that I use.

Regards,

DH
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Nov 16, 2012, 08:09 PM
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Base


I will provide a base, thats very similar in design. It will have adapter cradles, for 55mm, 70mm, 90 mm. and 100mm, fans. All aluminum base and balance bar. Introductory price of $65, plus shipping, as long as I get a minimum of 10 orders. I can also provide other adapters for other fans.

Larry E.
SouthEast Model Products
Orlando, Fl.
Nov 25, 2012, 08:06 AM
Registered User
Bob Blackburn's Avatar

Well Done Dynex


Looks like I have finally got some competition after 5 years

Thats a novel way of mounting the fan unit I wonder what gave you that idea?
I am considering kitting the Bobsworkshop unit if there is enough interest.
Latest version below
Nov 25, 2012, 11:58 PM
Good vibrations.
dynexhobby's Avatar

Cradles


The Cradles are industry standard. See attached image. We found soft bearing cradles worked very well.
Nov 26, 2012, 08:15 AM
Registered User
D_FAST's Avatar
nothing wrong with a little friendly competition!

Price war anyone? :P m seriously looking into one of these, and dynxhobby looks a bit more professorially done.
Nov 30, 2012, 04:55 PM
Good vibrations.
dynexhobby's Avatar

New short kit


Hi guys,

We just released our new short kit. Only takes 10 minutes to assemble now.

http://dynexhobby.com/assembly.html

regards

DH
Nov 30, 2012, 07:35 PM
Gorilla Glue Expert
PikeStaff's Avatar

Dang!


THIS is the way to go! On top of all the pre-programmed software, I cannot wait to put this unit to work. Much easier than the saddled-up cellphone method
Last edited by PikeStaff; Dec 01, 2012 at 09:10 AM.
Dec 02, 2012, 03:11 AM
Registered User
With the balancer cradle..... the 'blue thing' used for inrunners.... is that just a foam block and is not critical to be isolated? Just something to rest the motor on?

And the 'black thing' used for outrunners looks like a cardboard box, again just to rest the fan housing on - no need to be isolated?

And the 'pivot bar', with 'soft springs'.... I guess you aim to centre the fan as best as possible, but it main aim is that it at least has some motion ability - not critical to be dead on 50% weight either side?

And then as per the manual, the sensor is going to be blue-tacked onto the top of the fan.

Those balancer cradle specs.. with the fan used there seemingly a 120mm fan (??)..... but I assume those same sort of cradle specs would still work fine for 90mm, 70mm, 64mm, and probably even down to 50mm ???

And.... LOL..... though it is an alloy 'box' for a base, it could probably be any solid support - like even a wooden block?? Though that might absorb a fraction of vibration, so the more rock solid the better?
Dec 02, 2012, 07:48 AM
Registered User
Subscribed
Dec 02, 2012, 08:30 AM
Gorilla Glue Expert
PikeStaff's Avatar
Quote:
Originally Posted by PeterVRC
And.... LOL..... though it is an alloy 'box' for a base, it could probably be any solid support - like even a wooden block?? Though that might absorb a fraction of vibration, so the more rock solid the better?
Find a chunk of cast iron from any old source - that would be the best isolator you can find.
Dec 02, 2012, 11:59 AM
Diverted by planks
tracknoob's Avatar
Subscribed while waiting for my package to arrive!

Dec 02, 2012, 02:17 PM
Good vibrations.
dynexhobby's Avatar
Hi PeterVRC,

Yep the blue thing is a block of foam stiff enough to support the motor. The black thing for the outrunner is just a box lid (only shown for demonstration purposes). I would use the same blue foam for the outrunner setup (it just wasn't thick enough for the photo).

You want the fan to be centered on the pivot beam. The rest of the mass is supported by the blue foam.

The cradle picture has been used for fans 90mm to 125mm. For smaller fans you will need to change the springs to something softer. Strange enough, I balanced an EDF (50mm) by blue-tacking the shroud to a solid wood board (same width as EDF) and wrapping an elastic band around the fan and board. Seemed to work well but maybe I was just lucky on that occasion. Bottom line is you will need to explore the option that works best for your setup.

And yep my base is an alloy box. I wanted to use something anyone could buy off the shelf. The most important ting is to have a solid workbench to place it on and isolate the setup from the bench. I used a blue yoga mat, seemed to work for me.

good luck,

DH

Quote:
Originally Posted by PeterVRC
With the balancer cradle..... the 'blue thing' used for inrunners.... is that just a foam block and is not critical to be isolated? Just something to rest the motor on?

And the 'black thing' used for outrunners looks like a cardboard box, again just to rest the fan housing on - no need to be isolated?

And the 'pivot bar', with 'soft springs'.... I guess you aim to centre the fan as best as possible, but it main aim is that it at least has some motion ability - not critical to be dead on 50% weight either side?

And then as per the manual, the sensor is going to be blue-tacked onto the top of the fan.

Those balancer cradle specs.. with the fan used there seemingly a 120mm fan (??)..... but I assume those same sort of cradle specs would still work fine for 90mm, 70mm, 64mm, and probably even down to 50mm ???

And.... LOL..... though it is an alloy 'box' for a base, it could probably be any solid support - like even a wooden block?? Though that might absorb a fraction of vibration, so the more rock solid the better?
Dec 03, 2012, 08:17 PM
ancora imparo
jj604's Avatar
Balancer arrived safely yesterday. Nice to get one of the first 10 fully assembled.

Looks like it works perfectly but of course my main PC has a mono mic input only and my workshop PC with a stereo in sound board just had a hard disk crash!

the iMic stereo adapter is on its way.

John
Dec 03, 2012, 08:26 PM
Gorilla Glue Expert
PikeStaff's Avatar
Got mine last week, but wife impounded it immediately as a Christmas present....... so going to be a couple weeks before any testing can go.

Meh.....gives me time to build the base.
Dec 03, 2012, 11:29 PM
Registered User
OMG that is just bureaucratic inefficiency at work!! You better explain to her the ramifications of such short-sightedness.....
Planes could crash! They could hit people or property! Law suits could follow! Jail time! No income, wife and kids struggle... turn to crime.... the Butterfly Effect..... who knows how wide her actions could expand out to!!


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