912ULS Temp in Vegas

Mine runs about the same in the 90s OAT around here although I did have the external alternator shut down the other day in the hot muggy and smokey weather. That was scary.

I try to climb slow or in steps to keep it under 250.

Thanks Fred--

I appreciate the response sir--

VR

Joe

"I am a  first time owner/flyer of a 912ULS--I live in Las Vegas and its Hot--

That said my Oil Temp at Taxi is +/- 219 and on climb out is 250+/- with an OAT of 110--"

Hi Joe,

"Taxi is +/- 219" (104C) is only just okay during low power ground operations but sets your engine up for high temperatures during take-off/climb out when its operating at high power and generating more heat.

250+/- (121C) during TO/Climb is getting worryingly high but still just within Rotax operational limits.

Rotax recommend that the oil temperature should go over 100C (212F) for a sustained period (I suggest minimum of 20 minutes). This is to drive off volatile fractions, such as water, fuel, byproducts of combustion.

What are your cruise temperatures? I like to see low to mid 90C's (194-203F)

I live in Australia, so am passingly familiar with high ambient temperatures. I would make the following observations/suggestions:

Double check that your engine cooling systems are actually operating at their best - Oil and coolant (glycol/water is best) levels are full. Air entry/exit /flow optimum (check oil cooler/radiator/fins for contaminants).

Minimise taxi time and engine high speed run ups. Point nose into wind whenever possible.

Shallow climb outs and step climb (as per Fred above) to reduce load (heat generation) on engine.

If appropriate, reduce power, when safe to do so. Higher the power setting, more fuel burnt, more heat generated

After periods of high engine temperature operation, consider more frequent oil changes (I do 50 hrs).

Whenever possible conduct TO's during the cool of the day. Early mornings are best, the air is usually nice & smooth and density altitude effects minimum. Late afternoons are okay but "last light" must be adhered to and landings into the sun can be problematic (I usually start at first light and stop when the temperature gets above 35C/95F).

Personally I find flying much above 30C ambient to be unpleasant - in addition to "cooking" in the cockpit there is usually significant turbulence, which is great for glider pilots but not so much fun in a powered aircraft.

Hope this helps.

I’m in the California desert and it’s too hot for comfort after 7am. Even that early my ULS wants 90kts while climbing to stay cool but stays manageable.

Has anyone had success lowering oil temps with the high flow radiator? 997084

I’m seeing temps in a climb around 250 degrees F in OAT above 75 degrees. 

I swear it was lower prior to maintenance. 

Step climb is a good idea, also 90 kt climb and lowe power setting.