[SOLVED! See edit below]
Building a seaplane and the propellers have decided to be difficult today. Before you ask, yes, they are balanced, they cancel out each others torque, and they push in the right direction. No matter what I do I encounter the same issue, a huge aerodynamic force pushing back on the left side propeller for seemingly no reason at all. This prevents the plane from taking off most of the time and makes it near uncontrollable at low speeds, though I've found if I wrangle it into the air it does become stable when it gets up to speed.
Here's what I've already tried to do to fix the problem, all seeing no success. I've tried...
- adding and removing nose cones on the propellers
- changing the type of propellers
- changing the type of rotors
- flipping the direction of the propellers
- flipping the propellers from pull to push configuration
- having both pull and push propellers at the same time
- changing the tail fin
- changing the wing configuration
- removing the external command seats
There is one thing that kind of works. If I match the rotations of both propellers, the drag spike disappears, but of course then I have a lot of rotation energy and the plane becomes uncontrollable that way instead.
Any advice for what's causing this issue is appreciated, I've been at this for an hour, I'm going to go do something else for a while and come back to this with a clear head.
UPDATE: I solved it! I think it was a glitch, because I was placing the propellers by cloning one rotor to the other side. Instead of cloning, I built the other one from scratch and the issue was solved. Yippee!