Wondering if anyone else has been following the build videos on the Rotax Owner web site?

http://www.rotax-owner.com/ (rotax factory authorized support site)

Although the plane they are using is a zenith CH750, the engine is a 912is. Just consider it a FFW with a 912is.

The site now has 5 videos. Can't say I found all of them equally interesting; however two of them were good for bulders in theory regarding fuel system testing and design of the cowling for the 912is.

I don't think many of us would go to the extent of fabricating a window into a header tank to see what the fuel does under various conditions; but, the fuel system testing has many points to think about when testing a fuel system in general. The explained the logic behind fuel line sizing and routing, which is particular to the fuel injection system in this case; could give us reason to think about what we do with any installation.

The cowl build showed a backflow duct in the high pressure area at the bottom of the windscreen. Reminiscent of some of the muscle cars with induction cowling of a similar design. In this case, the backflow design was explained to provide cooling air for the electronics in flight and a place to vent warm air off the engine after shutdown.

Sincerely,

Dave S
KF 7 Trigear
912ULS Warp Drive