RE: DLE-35/Cowl Cooling
On several occasions I posted my recorded temperatures of well baffled engines.
In short, I have two types.
Using Venom gauges topmost rib against cylinder wall, well shielded from cooling air:
Normal flight, engine well tuned, 155°C peak temperature. Towing duty 200°, test stand , no shrouding, 220°C
Using a thermocouple under the plug seat and data logging:
Normal flight 200°, towing duty 220°C, test stand 240°C
All temperatures corrected for 20°C ambient. measured temperatures follow ambient temperature differences almost exactly.
PS
I never measure after landing. It's useless.