Hello
Regarding the 109 overheating issues, one thing should be kept in mind: the 109E4 comes equipped with kommandogerat whereas the previous versions don't.
To take off and fly in an E4 observe the following procedure:
- Fuel cock on;
- Pressurize the fuel system by operating the hand pump on the lower right- hand side of the cockpit a couple of times;
- Magnetos on (although these will be switched on automatically at ignition time);
- Ignition;
- Lower the flap to the takeoff position;
- As the engine coughs to life switch kommandogerat (auto prop- pitch) off, set the prop pitch to the quarter to twelve position;
- observe the engine temperature indicators (oil and water);
- as the temps approach 40 degrees Centigrade open the oil radiator to half and open the water radiator until there's half a spin of the handle left;
- Give the aerodynamic controls a move through their full travel;
- Taxi to the runway and take off;
- Once in the air retract gear and flap;
- Switch the komandogerat back on and check whether it's working by observing whether the prop- pitch indicator needles rotate with the change of airspeed and movement of the throttle;
If all of the above is done You wan't need to worry about engine overheating
In the older 109s whitch don't have komandogerat just try and keep the engine RPM below 2300 through prop- pitch control and throttle position.
Good luck