Hubsan Official Forum

loss of altitude during acceleration, turn and gas.

Hello eur_c7439NKnO8,

I email you for further checking this loss altitude issue.

Hello Ailsa

I have same issue.
Please send me the advice too.

Bonjour,
J'ai le même soucis de perte d'altitude.

This is common in quads that use only a barometric sensor for maintaining altitude, barometric pressure inside the quad will fluctuate with wind speed either by the wind blowing or by throwing the quad around in turns or accelerating hard. This is why more expensive quads now use ultrasonic sensors as well as barometer.

I have noticed the Zino loses height faster than the old 501 but I believe this is because it is heavier. Just use a bit of up stick in your turns. The Zino is a not a 100% set and forget Quad you have to fly it

Hello all,

Kindly check all your email,hope will help you.

The Zino is a bit "quirky" when it comes to turns (at speed).
I think the FC firmware needs looking at a bit closer

Here's what actually happens.
In a left hand or anticlockwise turn, the quad loses altitude as it goes through the turn.
In a right hand or clockwise turn, the quad gains altitude

The normal reasons for this is the way the FC balances the roll against the altitude.
To turn left you normally increase the power in the RHS motors, whilst reducing power in the LHS, but in ALT hold, also balancing the two so that altitude is not lost. It's a balancing act.
A Right hand turn does the opposite. If the increase and decrease are not balanced, you can get rapid changes of altitude as a result.

Funnily enough I videoed this today as part of a failed live broadcast
In a way it's well the broadcast failed, because the wind noise was a bit excessive.
I do however have some footage which I'll try and edit out the worst of the wind noise, to demonstrate this feature, and I'll post it up on YT as soon as I get a chance.
It would be nice however if this "feature" was addressed in the next FC release

Here's the demo of the altitude LOSS in a LH turn, and the altitude GAIN in a RH turn.
Hopefully Hubsan canlook at tweaking the FC to balance those out

Starts at 11:10

Hello ailsa,

Thanks for the e-mail.
I tried it today and feeling is much better than FC1.0.46, but it is not enough yet. There may be impact of strong wind, but i think more tuning is necessary.
It seems that altitude drops with forward travel at max pitch or turning with max rudder.