Odd spinner problem....

Rhys · Post by **Rhys** » Sat Mar 18, 2006 4:31 pm

I've had a bit of a problem, and was just wondering if anyone else has had the same experience. I've just been testing out my spinner, and as I throttle up between 40-70% i get horrible vibrations. But then when it gets over 70% it all seems fine, and I can continue on to 100% without any problems.

Any ideas why this has happened? I could understand if it got worse at 100%, but not why it gets better.

Flippt · Post by **Flippt** » Sat Mar 18, 2006 5:09 pm

Can it be the gyro effect?

peterwaller · Post by **peterwaller** » Sat Mar 18, 2006 5:22 pm

I have had this problem with some spinners that are badly balanced. The vibration is often worse at low speed I think due to hitting some kind of resonance. If you get the spinner well balanced it should be OK at all speeds.

Post by **BeligerAnt** » Sat Mar 18, 2006 9:05 pm

Yes, balance problems will often be at their worst over a fairly small speed range. I used to have a car that periodically suffered from worn track rod ends. It would shake like anything - but only at 70mph - any slower (or faster

) and it would be perfectly fine. I think you get the same effect if a car wheel isn't balanced properly - you only really notice it at certain speeds.

Rhys · Post by **Rhys** » Sat Mar 18, 2006 9:43 pm

peterwaller wrote:...due to hitting some kind of resonance...

Yep, that's what I was looking for. Well that's fine with me. I wasn't plannig on being below 100% throttle that much

Remote-Controlled Dave · Sun Mar 19, 2006 1:09 am

due to hitting some kind of resonance

You mean, like your hapless opponent?

Flippt · Post by **Flippt** » Sat Jun 17, 2006 11:22 pm

Now I got a odd spinner problem...

I was test-spinning Desire, and pretty much went okey, except one thing:
My brushless motor has reversed direction! It was spinning clockwise when I started the spinup, but when I tried a second time it went anti-clockwise.

I didnt do any changes with the setup.

EDIT!!! I just swaped some cables and its going clockwise again

But I'm still wondering over how the motor could reverse direction, without changing any cables.

Andrew_Hibberd · Post by **Andrew_Hibberd** » Sun Jun 18, 2006 9:23 am

That is very odd that it changed direction without changing anything. There could have been a short circuit somewhere.

Might as well say swapping two of the 3 wires to a brushless motor will change its direction.

Remote-Controlled Dave · Mon Jun 19, 2006 10:43 am

I get that with brushed motors all the time, didnt think it would happen with brushless ones though.

Flippt · Post by **Flippt** » Tue Jun 20, 2006 10:36 pm

Cant be bothered to start a new thread...

Yet another problem accours, just a few days before the event!!

I've got a E-tec 300HP batterypack, and when I tested Desire tuesday afternoon, it stopped! The ESC did some sounds and blinked, and I thought it was just a need for a re-charge. When connecting to my charger on 3 cells, it says its wrong amount of cells!

I quickly grabbed my Digital multimeter, and to my horror, it showed only 8,4V! A cell is dead!

I will go out and buy a new one later, but heres my question:
The pack I'm using atm is 300mAh. If I add another ?4, I can get 450mAh. I got the weight and space. Should I get it instead?