EDF Dynamic rotor balancing - Page 11 - RC Groups
Thread Tools
Jun 09, 2012, 03:38 AM
Registered User
Bob Blackburn's Avatar
Originally Posted by BJ64
Do you do any "specials" for overseas buyers, Bob?

Currently I am EXTREMELY busy.
So I can't see any slots to do specials.

There are currently 3 units partly assembled ready to finish and post after that it may become harder to get them out for people.
Sign up now
to remove ads between posts
Jun 09, 2012, 04:10 AM
The wheels touch down FIRST??
BJ64's Avatar
No worries.

Looks like I better get in the queue early then...

Jul 16, 2012, 09:52 AM
scunna's Avatar
Hi bob heres a video of your balacer i received today. Very impressed, the fan on video was actually balanced on magnetic balancer last week after playing with your balancer fo an hour or so i thought i would check it. Exellent work Regards Rod

bobs workshop EDF fan balancer (0 min 54 sec)
Jul 16, 2012, 05:32 PM
It should fly at least once
clive45's Avatar
Hi Bob, is that a better led light you are now using , seems much better than the silver one I have with the leds in a row.
Jul 17, 2012, 05:51 AM
Life's short - Enjoy!
DeeCee 57's Avatar
exactly what I was thinking Clive!

Bob, any chance to get this new light separately or even better, is it maybe an off the shelve item since I noticed the attachment is kinda USBish?

Jul 17, 2012, 04:41 PM
Registered User
Bob Blackburn's Avatar
The video will help to make the strobing look brighter!!!!!!

The triple led silver ones should be as bright as the single black one in the vid.
Yes they look like a standard usb lamp but I have modified the current limiting.

some have a 10 ohm resistor on the pcb and the lamp has no current limiter so dont try it in a usb slot.

if the pcb resistor is linked out then the current limiter is within the lamp.

You can pop the face off the silver ones to see if the resistor is there, if it is you can lower the resistance to get the lamp brighter.
Jul 17, 2012, 05:51 PM
It should fly at least once
clive45's Avatar
Thanks Bob for the info, I will leave mine alone for the time being................
Nov 24, 2012, 06:39 AM
The wheels touch down FIRST??
BJ64's Avatar
Any new info for the thread?

I've got my Bob-o-Matic balancer, and done a few small tests so far. Unfortunately, nothing big to report yet as there's a few other areas of my life getting some overdue attention just now.

The only thing that concerns me regarding this dynamic balancer is how sensitive the internals are.

Man, I nearly pooped myself when I slowly edged up the throttle on a 2S LiPo via a servo tester.

Nothing...nothing...nothing.. and then it suddenly jumped into life.

Not uber-fast, but it gave a fair jolt.

Bob - how sensitive are these sensors? And how much is too much?

I've put balancer on the self for now - a bit wary of applying too much force to the sensor pads and risk causing my blancer to sh'it itself.

Are the sensor pads available/expensive.. and how hard are they to replace in case I do the wrong thing...???

Nov 24, 2012, 12:02 PM
Registered User
Bob Blackburn's Avatar

Some escs are poor at starting smoothly dont forget you can use a smaller esc as you are not doing any real work with the fan/motor so you may have an old one in the bits box.

enable the soft start function in the esc, gearbox/heli mode if you can.

The sensors are quite tough but a big fan and a violent start may cause a large amount of travel.

The good news is they are not expensive 3gbp per pair plus postage.
I have been extremely rough with them myself and not been able to destroy one in normal use.

The nature of the way the unit is constructed will physically limit the travel so the beam cannot get at them too badly.
Nov 24, 2012, 02:13 PM
It should fly at least once
clive45's Avatar
Had no problems with mine and I have used 90mm fans.....but as said use the soft start if you can
Nov 24, 2012, 08:53 PM
How close are those trees?
Goody63's Avatar
Yep I'm ashamed how rough I treat mine at times (even when I'm popping the EDF 'holder' on and off to do adjustments). But countless fans balanced and still going strong.
Nov 25, 2012, 07:19 AM
The wheels touch down FIRST??
BJ64's Avatar
Great - thanks for the info guys (and assurance LoL)

I'll rummage through my ESC box to see if I can find one that starts the motor spinning with little servo tester travel. And of course, "soft start" - great info I hadn't thought of...

Nov 25, 2012, 07:53 AM
Registered User
Bob Blackburn's Avatar

Latest version of Bobsworkshop balancer in silver

Just so people know, there is a new version.

Laser cut chassis
more rigid sensor mounting
more sensitive even though it was already very sensitive

Pictures and info not updated on the website yet

I am considering kitting this unit to help with the price I need to know if there is any interest in a kit option?
Nov 25, 2012, 09:03 AM
Registered User
Joe 1320's Avatar
Originally Posted by Bob Blackburn

I am considering kitting this unit to help with the price I need to know if there is any interest in a kit option?
I would be interested.
Nov 25, 2012, 09:46 AM
Registered User
DamonH's Avatar
I may be interested. What would the price difference be?

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
MF 480 rotor balancing Olivier Electric Ducted Fan Jet Talk 2 Sep 13, 2010 02:00 PM
Sub-Rotor balancing on Corona Orion_V Electric Heli Talk 11 Jun 27, 2003 10:46 PM
Corona Sub Rotor Balancing ??? johnitahoe Electric Heli Talk 2 May 26, 2002 07:42 PM
Balance GWS EDF-50 Rotor GoEFlight Electric Ducted Fan Jet Talk 0 Apr 02, 2002 11:08 PM
Rotor Balancing WKoltis Electric Heli Talk 4 Nov 02, 2001 01:05 PM