Shock Cooling

[FastEddieB]

Just looked at the CTLS POH I have on my iPad and it shows a minimum oil temperature of 120°f.

Not to say it might not be different for different CT Models.*

Just looked and 120°f also for my ROTAX 912ULS2 Sky Arrow.


*And I see Charlie Tango confirmed that.

[drseti]

The CTSW POH says 124

http://documents.flightdesignusa.com/SW-POH.pdf

page 8.3

It's interesting how different airframe manufacturers make up their own numbers, though ASTM rules allow them to set limits different from the engine manufacturer's. In this case, the CTSW POH says 51C/124F, while Rotax says 50C/122F. The difference is below the resolution of most temp gauges, thus negligible. But the CTLS gives yet a third number. So, I have to wonder why Flight Design put that 140 F number on their gauge.

[CharlieTango]

I have to wonder why Flight Design put that 140 F number on their gauge.

My gauge looks like its 122.

[drseti]

Just looked and 120°f also for my ROTAX 912ULS2 Sky Arrow.

Actually, I like that 120 number, and find it consistent with Rotax. Mathematically, 50 C translates to 122 F. But 50C was given to only two digits, so rounding off to 120F is consistent with the degree of precision documented in the Rotax manuals.

[MrMorden]

The CTSW POH says 124

http://documents.flightdesignusa.com/SW-POH.pdf

page 8.3

My gauge is tiny, it could be the line is close to 140 on the dial but is actually 124. I will check next time I'm out there.

[sandpiper]

I'm not sure we need to worry about shock cooling with Rotax 912"s in tightly cowled plane like CT's or RV-12's, especially if we are not flying in really cold temperatures.

However, I do think that rapid and full power reductions are generally not necessary and are indicative of poor piloting technics that could upset passengers and lead to bad habits that could cause problems with more powerful and more complex engines.

[designrs]

Well stated Sandpiper. Thanks. Opinion as expected, but it's good to hear for confirmation.