Questions raised during a recent CHT thread about the affects of oil temperature on CHT during climbs encouraged a test to determine the relationship between the two.
Results: Oil Temp has little or no influence on CHT during climb
Test: Two runs from Take-off to 6000PA, Vy climb @ WOT/Full rich. Each T/O was commenced with #2 CHT at 350 deg F to keep data consistent. Rate of throttle application, rotation speed and initial acceleration to Vy (110mias) were consistent between the two runs. Data was taken just prior to throttle application, 300ft, and every 1000ft to 6000ft via Dynon Skyview screenshot.
The first run was conducted with Oil temp at 100deg F at Take-off while the 2nd run Oil Temp was 159 deg F at T/0. OAT was within 1 deg at each altitude for each run. A/S was maintained +- 1 mias throughout. Ball centered during all phases of flight. Aircraft configuration was constant between runs.
Data: (note configuration and test conditions in upper corners)
Next test is to investigate the influence of heat soak on CHTs during initial climb.
Results: Oil Temp has little or no influence on CHT during climb
Test: Two runs from Take-off to 6000PA, Vy climb @ WOT/Full rich. Each T/O was commenced with #2 CHT at 350 deg F to keep data consistent. Rate of throttle application, rotation speed and initial acceleration to Vy (110mias) were consistent between the two runs. Data was taken just prior to throttle application, 300ft, and every 1000ft to 6000ft via Dynon Skyview screenshot.
The first run was conducted with Oil temp at 100deg F at Take-off while the 2nd run Oil Temp was 159 deg F at T/0. OAT was within 1 deg at each altitude for each run. A/S was maintained +- 1 mias throughout. Ball centered during all phases of flight. Aircraft configuration was constant between runs.
Data: (note configuration and test conditions in upper corners)
![1178f1k.png](/proxy.php?image=http%3A%2F%2Fi56.tinypic.com%2F1178f1k.png&hash=75b9a405d55eaeed0f1036e9365b3c50)
Next test is to investigate the influence of heat soak on CHTs during initial climb.