Bad Piggies Tusk ‘Til Dawn Level 5-11 can be 3-starred using a single contraption. Build a basic helicopter, but remove the left wheel. Place the powered yellow umbrella on the left side of the contraption. Work your way slowly through the level, using the helicopter rotors to move rightward and the umbrella to move left. Grab both star boxes along the way.
If you have a different strategy for completing this level feel free to leave a comment below.
To move leftward more easier, place the right wheel under the motor.
Video shows using both wheels. On the PC version, I found it easier to control with NO wheels. Less chance of hitting TNT too.
I made the basic cart with the rotor in the middle on top. Put the umbrella on the left side then the pumpkin, pig, then engine and moved the left wheel over to the middle. Make sure the umbrella is at least partially closed when you move right to make it easier and turn it on to move left.
Used your method. Slow and steady is essentially the real key here. If you hit anything even a bit it’s enough to set off a chain-reaction and cause the cart to crash.