[whoarmongar]

If your blowing rads and head gaskets your doing something seriously wrong. OVERHEATING.

Watch your temps. It can be taxiing thats the problem, use your brakes to help steer on the ground, your aim, once your engine is started is to get off the ground ASAP.

As soon as your temp aproaches 40* get going.

As soon as your airbourne get your gear up, stay low to pick up speed and switch to coarse pitch. NOW your revs will be to low perhaps less than 2000, but look at the temp gauge, Your temps will be plummeting with coarse pitch and full open rads the temp will drop amazingly. perhaps down to 40*.
Now you can close the rads a bit,play with it see how it affects the temps.
In coarse pitch level flight you may have it open as little as 10% perfectly safely.

To recap.

At the moment your low slow in coarse pitch. your aim should be to climb and gain speed. BUT now your temps should be OK. your choice is a gradual pickup in coarse pitch of speed and altitude. or you could point the nose a bit steeper switch back to fine pitch and climb in steps.
In fine pitch full revs low altitude its easy to overstress the engine, open the rads and watch the temps.
At higher altitudes in fine pitch its easy to overrev the engine watch your revs.
You see the difference ?
Low altitude = denser air, warmer temps.
High altitude= thinner air lower temps.
By now it may be starting to dawn on you that its all a balancing act.
In the same way your having to balance your inputs into the flight controls, your also having to balance your engine controls throttle/prop/cooling.
As you change throttle and prop this will affect the torque effect on your aircraft, so to fly hands free you will be constantly changing your trim.

It sounds more complicated than it is. Very soon it becomes second nature.
Its well worth mastering, as this is the beating heart of this sim.
Persevere and enjoy, becouse its worth it.