RE: trainers: engine size, prop size, weight
G'day Mate,
The speed the plane flys is not really related to the engine size, it is determined by the elevator trim & the throttle setting, if it is flying too fast for you, tell your instructor, & get him to trim the plane so it flys slower, eg. more up trim, less throttle, trim for straight & level at about 1/2 throttle, or you may need less throttle than that, that's what the trims are for.