My brushless MCPx thinks it's a dolphin!

[jamesandyori]

Really!

Ok here is the skinny. Recently my MCPx has developed a porpoising action. It's a slight up and down movement at the nose. It's not constant and will calm down in a hover.

Here is my heli's breakdown!

MH 3 bearing CF frame
extended solid boom with cat 5 wire soldered directly to the board from a 120 motor
plantraco turbo prop
brushless system with a HP05 s motor and 7m speed control
MH swash
Rakon boom support
MH hub
fresh clean servos
new main gear
new MH solid shaft
V-1 board
I use Hyperion 550 mAh batteries with stock plug installed.

I use the stock plug on this heli. The deans seems too bulky for me.

What I've done is:
Replace the feathering shaft, main shaft, main gear, cleaned servos.

So here we are, with my very own flying dolphin.

Any ideas? Could the stock plug be causing the problem? Is it allowing enough energy through to the system?

thanks,
James

[nhoj_yelbom]

check your plug wires under the heatshrink. i had a problem with my neg wire only had two strands still soldered.

[Nytflyer]

What main blades are you using? I find the stock high perf main blades make my BL helis porpoise. The bullets are better but still get a little dolphin action here and there. The kbdd main blades have pretty much eliminated it all together.

[jamesandyori]

I didn't physically check under the hood, but I tried 2 different plugs. Could both be frayed?

As for the blades I tried KBDD blue, white and the high performance blades and bullet blades.

James

[craig303uk]

KBBD's and try to get rid of any play in the feathering shaft / blade grips helped with my dolphing problem, with the stock non bullets on it would go mental unless u give enough pitch to pull through it in FFF.

was better when i ground down the feathering shaft a little.

[dr dremel]

Porpoising on my c05 bird came from play between main shaft and bearings. I sanded down the cf rod I bought for replacing a cracked shaft just a little to much. After replacing it with a correctly fitting one the porpoising was gone.

[jamesandyori]

Originally Posted by dr dremel

Porpoising on my c05 bird came from play between main shaft and bearings. I sanded down the cf rod I bought for replacing a cracked shaft just a little to much. After replacing it with a correctly fitting one the porpoising was gone.

Hummmmm I could pop them out and clean them! I have a ultrasonic cleaner that cleans jewelery and such.

[dr dremel]

Sorry if I wasn´t accurate enough, but my bearings were ok. The play came from my home made main shaft, which I sanded down to much.

Bearings are worth checking, though. Even if I doubt that cleaning will remove any play, cleaning and relubing goes a long way for smooth operation.

Cheers
Dr Dremel

[profilefan]

Do you have the o rings on all of your swash balls? That solved my porpoise effect by placing the red orings on the upper swash balls. Forgot who was selling them here.

[jamesandyori]

It has V-2 mechanics, so it has the black o-rings from Blade.

James

[Bee_random]

Just solve this one for my latest build. New metal swash and the rear ball had worked itself lose. Now loctited and grommet mod to all three not just the front two. Also spotted a lose screw on a side servo.