AR-1 gyro manufacturer
- Oct 31, 2011
- Tampa, FL
- Total Flight Time
- 4000+ 380 gyroplanes. Sport CFI Gyro and Trikes
It is not about Rotax engine, it is about Magni oil thermostat and position of the oil radiator below oil tank.
Pephaps if oil radiator on M-24 were above the oil tank, as on M-16, the water would accumulate not in oil radiator, but in the oil tank, from where you drain it every oil change and not even notice.
Oil radiators in almost all Rotax equipped aircraft will be below the oil tank and at best at the same level. That is not the problem. Oil is heavier than water and water should not accumulate at the bottom of the radiator but pass through the radiator as it will be at the top. Most of the Mocal or Permatax thermostats are for 185 deg F.
Every 100 hours Rotax requires that oil change is accompanied by taking all oil out, cleaning the oil tank inside and refilling the whole system with new oil.
Getting the oil temp to 212 F for a minute can and likely should be done after a flight on the ground by running up the engine stationary. If in cold weather, you can cover a part of the radiator for the winter if necessary. Making a system that works in the middle-east and in frozen places without overheating is not easy. The lowest common denominator wins. You'd rather run a little cooler than overheat an engine
Edit Add: duh oil floats on water usually. I have them backwards. But if the flow is correct and the oil radiator is made correctly there should not be accumulation of water at the bottom. It should flow through and then if you get the oil temp up to 212 for a couple of minutes that water should evaporate