any tips on cleaning out the cowl?

It's quite ingenious the way you have that rigged up. If you really wanted to get fancy you could rig up a couple of bypass actuators and doors like a real cowl induction or air grabber hood to get warm engine compartment air when the engine first starts and cool cowl air when you stomp on it :burnout: I still think that is pretty a cool setup though just the way it is.

Like your helo too. What is that? EMS? I'm a former helo driver so that's why I'm curious.
Sorry for the hijack. It is a Agusta 139, 12 pass with 2 P&W PT6c67c engines 1300 HP each or 1800 plus on one engine. first twin engine mid size helo with true single engine fly away. used in offshore oil and EMS/RESCUE. PM with contact, we will talk.