Which one the two (or both) , the elevator or the throttle, controls the climb and descent of the aircraft ?

It's both. The throttle controls forward thrust, which translates to lift by the wings. The elevator controls the aircraft's pitch. If you're in level flight and you increase the throttle or increase the angle of the elevators, you'll go up.

Try it for yourself:-Fly straight and level and reduce the throttle. Does the plane desecnd?-Fly straight and level and trim down. Does the plane descend?

From level flight. Power, Attitude, Trim.To climb, increase power, increase the attitude and trim to hold it. Converse to descend.But on approach. Prop a/c :- Throttle controls the rate of descent and elevator controls the speed. Jet a/c :- Thrust levers control speed and elevator/stabiliser controls rate of descent.Colin B

From level flight. Power, Attitude, Trim.To climb, increase power, increase the attitude and trim to hold it. Converse to descend.But on approach. Prop a/c :- Throttle controls the rate of descent and elevator controls the speed. Jet a/c :- Thrust levers control speed and elevator/stabiliser controls rate of descent.Colin B

Thank you all for responding to my question.But as for yours, M.Colin B., I find it difficult that Prop a/c Jet a/c react differently to elevator & power . Can you please say more about this difference? Because, I consider that jet engines or a prop engines both produce thrust.

Thank you all for responding to my question.But as for yours, M.Colin B., I find it difficult that Prop a/c Jet a/c react differently to elevator & power . Can you please say more about this difference? Because, I consider that jet engines or a prop engines both produce thrust.

Its because there is a delay (a few seconds) in Jets between the time the thrust levers are moved and the engines producethe actual commanded thrust. So that would be a poor method of controlling pitch.In props the thrust produced when the throttles are moved is fairly immediate and the pitch changes as a result would also be fairly immediate.But really I think you can't go wrong using both in Jets.RegardsErnie.

Props "blow" over the wings- jets don't.

Its because there is a delay (a few seconds) in Jets between the time the thrust levers are moved and the engines producethe actual commanded thrust. So that would be a poor method of controlling pitch. In props the thrust produced when the throttles are moved is fairly immediate and the pitch changes as a result would also be fairly immediate. But really I think you can't go wrong using both in Jets. RegardsErnie.

Clear now, thak you so much.

Thank you all for responding to my question.But as for yours, M.Colin B., I find it difficult that Prop a/c Jet a/c react differently to elevator & power . Can you please say more about this difference? Because, I consider that jet engines or a prop engines both produce thrust.

There is obviously a requirement to use power and elevator together (and then retrim) but the primary uses are as posted and as learned and used over 40+ yrs of RAF & Airline flying. If you cannot bring yourself to believe it, I suggest you visit your local library to get books on basic fundamentals first then progress to such as Davies' "Flying the big jets" to see why there is a difference. It is not easy to explain such a topic in a few simple words in a forum. Colin B