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Rotax cooling system!
Posted:
Wed Jul 10, 2024 8:47 pmby dboeshaar
I'm excited about the factory announcement for the new cooling system for Rotax equipped Sonex kits!
I'm a builder and not a designer. I feel the Rotax is the best choice for my mission and I now have a great deal of confidence that I'll get safely into the air.
How many others here are planning on a Rotax engine?
I have not yet purchased the engine but I'm planning on a 912 ULS
Dkb
Re: Rotax cooling system!
Posted:
Wed Jul 10, 2024 8:58 pmby 13brv3
I guess I missed the big announcement. Last I heard they weren't even flying the only 912 prototype. I do think they'd be well served by making the 912 a more supported option though.
Re: Rotax cooling system!
Posted:
Thu Jul 11, 2024 2:19 amby Skippydiesel
My Sonex Legacy/Rotax 912ULS had its first flight 18 months ago.
High coolant temps on ground , high oil temps in air. Tried everything I could think of - lots of extra cowling hole/scoops and ducting (not all at once)- all helped a little but not enough.
Took aircraft out of the air for 4 months for cooling system revamp.
All good now, thanks to conventional forward position for coolant radiator and Rotax Extra Large Oil Cooler now in engine bay exit air stream
Winter here in Eastern Australia; In Cruise - Coolant (with some blocking strips) 89C, Oil 96C - not perfect but will do me.
Note: As far as I can tell from the Sonex press release the new cooling system is addressing Coolant Radiator only - don't forget you have to cool the all important life blood/oil.