drseti wrote:rcpilot wrote:They have quick drain valves for the Rotax oil tank.
True. Rotax neither sells nor specifically authorizes them. Of course, in an experimental, they're perfectly legal. And some SLSA manufacturers install them, or may issue an LoA for you to install one, which is also perfectly legal. But, if the spring fails and you lose all oil, the engine is going to seize. Could that maybe be why Rotax doesn't install them at the factory?
What do you think of the Sky Arrow’s setup?
A hose stays permanently attached to the oil tank drain point with no valve at all, just a plug installed and hose-clamped at the end of the hose. At oil changes, just route the hose downward and remove the plug. Seems like an elegant solution with little to go wrong.