I don't know what the issue is witha 70" trainer on a 52 four stroke but I am in agreement with all the guy's who are saying his approach angle is too steep,he should look at full size aircraft they usually have an approach angle of 3 degree's. My house faces the approach to our local airport at six miles out the planes are flyingin just slightly nose down and about a 600 ft up, and they make it onto the runway at that angle.The biggest problem we have with learners and some guy's who don't realise it is that the stick on the left is more than an on off switch,it is about reducing power halfway down the down wind leg of their approach to a landing,not at the last turn onto the runway.
A slower aproach speed will develop into a better landing than trying to slow down and dump it on the runway because you are coming too hot.
Jim.
www.modelclub.org