Help! Baby bugatti not maintaining its altitude, nose dropping

[Karthik1130]

Hello all,
Recently built a depron foamboard Baby bugatti RC plane. The plane had the automatic tendency to drop its nose when trying to cruise, at a good altitude with a constant 75% throttle. The plane asked for constant elevator stick input to make it fly in a straight line like a dart, parallel to the ground.

Why this is happening? Can somebody help!

 

[Mr NCT]

How does it glide without power? If it glides fine without up elevator then your thrust angle is pulling down. If it glides the same as it flies under power then check your CoG, it may be too far forward. If both of those check out okay then it might be the angle of the horizontal stabilizer. Hope that helps

 

[Karthik1130]

Hi, all it was a success. I flew the plane at windspeed of 24km/h and the plane maintained its altitude without any adjustments to the elevator input .This time,the CG was pushed slightly forward by placing the battery slightly forward and it maintained its altitude while cruising.

Unfortunately, the plane when taking a tight turn towards the wind, suddenly it spiralled after coming out of turn and crashed into the ground.
What could be the reason?

 

[Mr NCT]

Hi, all it was a success. I flew the plane at windspeed of 24km/h and the plane maintained its altitude without any elevator input adjustment.This time,the CG was pushed slightly forward by placing the battery slightly forward and it maintained its altitude.
Unfortunately, the plane when taking a tight turn towards the wind, suddenly spiralled after coming out of turn and crashed into the ground.

What could be the reason?

A spiral coming out of a turn is usually a stall. I've crashed more of my "speed" planes by trying too tight a turn and stalling than by anything else.

 

[Karthik1130]

A spiral coming out of a turn is usually a stall. I've crashed more of my "speed" planes by trying too tight a turn and stalling than by anything else.

what would be the remedy actions, I should follow next time when RC plane flying?

 

[Mr Man]

what would be the remedy actions, I should follow next time when RC plane flying?

You could try to keep your speed up in the turns, especially with speed planes like @Mr NCT said. (I do a lot of speed planes, so I have to do this a lot)

 

[Mr NCT]

Two options to keep your speed up: First choice shallower, wider turns or if that’s not possible increased throttle going into the turn.

 

[Piotrsko]

And every once in a while, you get one that needs a potload of "up" in a turn, but that is more common in aileron turns opposed to rudder turns. Does it bobble in stalls or are they abrupt?