The purpose of "takeoff trim" durring a decent???

[Immelman]

Food for thought: In better than half the (rental) airplanes I've flown, the trim indicator is so messed up that attempting to move it to the "takeoff" position -- even for takeoff -- will not have very desirable results.... trim for control pressure in a given configuration & desired airspeed, that's all there is to it.

 

[Kream926]

I do beleive I remember my instructor saying something about it compensating for the nose-down pitch induced by flap extension.

the airplanes i fly will have a pitch up moment when i extend flaps

 

[moxiepilot]

i'm thinking that it might be more along the lines of verifing that you're not going to have a trip up stall in case of a go around. without the power on a descent the student might not recognize the position of the trim tab

 

[Moonfly201]

Think of the trim wheel as an "airspeed" adjuster. Any action (whether it's a change in pitch, power, or flaps) that causes the airspeed indicator to register a different airspeed, will most likely require an adjustment of trim in order to relieve control wheel pressure.

Go faster, trim down. Slow up, trim up. Don't chase the trim for minor or temporary changes in airspeed (like turbulence induced), use it when you want to stay at a particular speed for at least a little while.

 

[darkvw]

I trim for best glide , then it's hands off all the way down , changing as needed