First Test-Flight Crashes

nomad

hello,

today i make my first test-flight:
OOPS
Start Procedures OK
Throttle stick = neutral.

quad goes verry fast up (you are airborne) about 10 meters ev. more not hovering or waiting for
throttle up ?

then i goes with the throttle-stick down
quad goes down, then i think i forgott consitence to take the throttle down. ?
then about 2-3 meters over ground : quad crashes in the ground.
- 4 propellers broken, landingGear left-side broken.
- at home: test FC-GroundStations-Soft- and HardWare OK

i think, if the stick is neutral == and quad is on ground then do nothing, propeller spinning (low)
if throttle up = fly up then back to neutral -> then hover

but i dont know whats happened...
ev. if starting: throttle realy verry low spin
with a yuneec typhon G: is the same procedure ok ?

now i hope i can repair the quad :-)

welcome tips and tricks
regards

geo_leeman

Hi @nomad - With the throttle in the middle of the range, the quad will accelerate upwards. You generally start with it at the minimum setting and increase until you just become airborne. This video is for a different quad, but still shows the basic principles, though the arming procedure is different.

Edit - video post appears to be wonky - link here.

nomad

hello
@geo_leeman

thanks for your good answer.
also its my fault. i have a another quad: yuneec typhoon g, and at this quad, neutral = props turn slowly....
i have download your clip thanks its help me.

in the meantime i make short test without props. RC-System on, lipo on
starting procedures ok
throttle-stick is down, then to neutral, super no problems, no stutter
on mot3 + mot4 (look my next post)
thank you verry much.

best regards
nomad

nomad

Hello,

in the meantime i repair my copter.
after this, i would calibratiing the ESC on SystemTest (step 25):
my first try: nothing ok, no tones, no text, (on linux) then change to win7
more trys, then all correct tones (beeps), text.

but the engineTest fail.
then (i must be gaga) i make the start-procedure with RC (no Props) and
the engines running, stop ok
but when i move the throotle-stick downwards. motor3 and motor4 not slowly down (stutter)?
is this a bad news for me?
then i go back to the software -> systemTest -> TestMotor: All OK

for ideas or tips and tricks.....thanks.

regard nomad

JasonDorie

Unless you are flying in "altitude hold" mode, the center of the throttle just means "half throttle" on the motors. It does not mean "don't ascend" - only altitude hold mode manages that for you, otherwise it is up to the pilot. The Elev8 requires a pilot to fly it - it does not fly itself for you, which is more like what a Yuneec or DJI quad is like.

With the Elev8, we recommend that you start at minimum throttle, then slowly increase the throttle until the quad lifts above the ground, then lower the throttle again. Do small "hops" like this until you get a feel for how much throttle you need to raise and lower the quad, and how it responds when you steer. Do this is an open space, like a field. Grass is better to crash land on than concrete.

With your engine test, can you try to say again what is happening? Motor 3 and 4 are not slowing down when you lower the throttle? It is possible you have moved the rudder stick or something else so the quad is trying to change its orientation. Look at the "motor power" values in GroundStation - there is one for Yaw Power, Roll Power, and Pitch Power - these tell you what the quad is trying to correct. If those are zero, it means the quad is facing the right way and level. If yaw power is not zero, it means the quad is trying to change the heading. If all of these power values are zero, then the throttle should respond as you would expect, with all motors changing at the same time. If one of those numbers is not zero, it means the controller is trying to correct something, so the motors may not all respond the same.

Does that make sense?

nomad

hello
thanks for your answers.

the whole stuff, with the throttle was my misunderstanding.
(ss. yuneec).
yesterday a make some test.
- i have a mode 2 rc-sender and changing the throttle-stick
old: selfneutralize, if move the stick then not neutralize, if moving the stick make little clicks.(on german: Raster-Stick)
excuse my english.
i find the Elev-8 the better system,
- simple, good Gui-software, and OpenSource,
- and you can DIY
- and i am the pilot :-)
today: - make new calibrations of Gyro and ACC.
- make testing the behave of mot3 and 4
- looking -> Yaw Power etc.

yesterdays test with throttle-stick down and the slowly up,
engines looks good,
but i would buy (carefully) propeller-sets and 2xESC, 2xEngines.
but the delivery-duration to switzerland is long (1 to 4 weeks)

when i have make the tests i make a posting.
nice weekend, regards
nomad

nomad

hello
@JasonDorie
my testings:
- 1) Gyro- and ACC-Calibrations OK
- 2) EngineTest with SystemTest : All ok
- 3) my Pseudo-Start:
- Throttle-Stick down OK no stutter, gently spinning...
slowly up (< neutral) OK no stutter, gently spinning
stop Engine OK
- 4) your Questions about Roll,Pitch,Yaw-Power (Status)
as attachment:
- Status-Engine-noRC-noLipo-1-1709.jpg
- Roll-Pitch-Yaw-Power-1-1709.jpg
- i must say that my working-table is not in a horizontal-level
(spirit-level)
- at the RC-Sender: i have nothing change values etc.
- the values are verry unstable, -> yaw-power if i turn the quad then the value smaller or higher
- on friday before crashing: quad flying up without problems, no burst, no, roll or pitch or yaw-problems.
- my questions is this essential for the quad?
- where can i change this behavior
- or is this the life: modified tarot-frame and modified placements of FC, RC, etc ?
- in the moment i can life with this stuff.

thanks for your tips and hints ;-)

regards nomad

JasonDorie

Hi Nomad - It is normal for the "power" values to change, even on the bench. Those numbers are the quad showing you how much power it will apply to each axis to make it go where it is supposed to. If it flies well, don't worry about the numbers - I'll try to make a video sometime to explain what they mean.

nomad

hello
@JasonDorie
thanks for the informations.
here its raining, and i hope that i can make outdoor-fly-tests in the
next week.
in the meantime i make some research for the groundstation-software and the firmware under linux.
thanks for all.
best regards
nomad