hi
im still building  my first one
but one think thats bothering me

when i arm without props on table
it like to you known probably
like start to vibe
and then it try to probably undo it so it vibes more and more
motors are starting to get hot from this etc

is it 'normal' on table with no props ? or i have done something wrong ? like put FC to hard and rubbers canot cancel this vibes? is this reason of this rubbers etc ?
thanks

You cannot test quad with props off.

It thinks its flying but can't so goes crazy.

yes i saw that i known that this is reason so my quastion was not about speeding just about vibrarions

in terms of no props, the vibrations are the same theme. there is no ability to do corrections for the flightcontroller, it trys to controll but what happens are vibrations form "wrong" corrections, tries to take over controll.

The only way to know if things are working properly is to put the props on and do an actual hover test (initially in angle mode) with your finger over the disarm switch in case you need to use it quickly. If the vibrations / oscillations continue, it will be then that you know you have a problem which you need to look further into, but if the vibrations / oscillations stop it means you are good to go

DYNAMIC_FILTER set up caused this vibrations to disapear - motors are spinning like it should 'in my opinion'
should i use this dynamic filter? or it should be off untill it is nesesery ?

(12-Apr-2021, 11:36 AM)UrbanJungle1966 Wrote: You cannot test quad with props off.

It thinks its flying but can't so goes crazy.

Why not? You arm the quad, motors start spinning on idle, drone is not flying - so no difference if you do that with props or without. They can spin the motors like that forever and they have to remain cold. Shouldn't be any vibrations either.

If you increase the throttle however that's when the quad may go crazy, especially in angle mode.

(14-Apr-2021, 10:44 AM)Major Tom Wrote: Why not? You arm the quad, motors start spinning on idle, drone is not flying - so no difference if you do that with props or without. They can spin the motors like that forever and they have to remain cold. Shouldn't be any vibrations either.

If you increase the throttle however that's when the quad may go crazy, especially in angle mode.

urbanjungles point out you can not test the functionality without props. he wasnt saying its not possible to arm, it makes no sense to do arm without rotors.
angle mode doesnt make a true difference - if ifs leveld. airmode feature makes a difference how crazy it freaksout. the flightcontroller goes crazy, there isnt just a littlebit more noise, there is plenty more vibrations. you can see this in a bb log.
the flightcontroller send commands which cant be done by the esc and motors, so its not healthy for any part, even not for the motoes.

after settup a quad, i arm my quads for a second, to check if it arms and the motors spin. anything else doesnt make any sense without props.
@major tom what else than see the motors spinnig would you like to check without rotors?

You're right without props you cannot check too much except the FC/ESC are arming and the motors are running in the right direction, but from my experience on low throttle they shouldn't get hot or vibrate, this is not normal with our without props.

vibrate/noise can probably be missunderstanding, it doesnt need to "truly" move, we can hear vibrations by tiny rpm changes, try to takeover controll.

we know from previous threads the op is building a 7inch with beefy motors, these motors will cause more vibrations as their "spin energy" is higher. dont know the right name; the force from the spinning bell.
its less vible on small quads with low force.



what could cause an issue would be things like wrong:
board aligement
motor mapping
motorspin directions

probabyl major toms point is good, there are different amount of "vibrations"
@d00lar it would be a good idea to check all the named settups above again - but !in betaflight configurator! xD

you can check motor vibrations in the motor tab to see if the motors are damaged in any way. But this is only one motor at a time. The graph that is at the top of the motor tab will show any minute vibrations in the motor. 0.00 is a perfectly balanced motor, this never happens...... If it goes above 1.0 then either you got a really crappy motor, or the motor has been damaged.

Some people might even change out their motors at 0.50 or less ;O

Either way, as long as the motors aren't getting too hot while FLYING then there shouldn't be too much cause for concern unless you're in a professional environment or something.

When you arm, doesnt matter what mode. There is PID loop.
No props = nothing to counteract error.

You should first test on bench with NO PID.

If you want to test motors are balanced:
Betaflight motors tab. props off. lipo connected. on stable surface. Ramp up each motor to 50%. Dont run this over 20s.

If you want to test props balanced:
You can use Betaflight Config or Motors live accelermneter display. Strap quad to table. Props on. etc..

like i sad DYNAMIC_FILTER set up caused this vibrations to disapear - motors are spinning like it should 'in my opinion'
should i use this dynamic filter? or it should be off untill it is nesesery ?
please answer someone

with filter i can play with it without props you known like balance left / gight and see that it try to balance it withoud any hot or vibes

i canot fly cause my battery is still ON THE WAY it should be next week
untill then i had like 2 old 2s so i made 4s out of them but they have like 10/20c so i canot fly with them - they are for some small rc car that my son have ;P

i would let dynamic filtering enabled

"with filter i can play with it without props you known like balance left / gight and see that it try to balance it withoud any hot or vibes"
you cant get any usefull informations about vibes or motorheat without rotors attached, as told the only usfull information from a quad without rotors is: does it arm and does the motor spin. does it burn xD nothing else.