feihu-RCU

this may sound not so good but...(im not a full scale pilot, but it intregue`s me):

you are saying flying (a cessna 150) with 10º flaps it takes fwd trim....to maintain 75mph, but.. when adding 30º or 40º of flaps...it takes back(up trim ) to maintain the same 75mph.... why would you want to maintain the same speed>?(with 10º or 40º of flaps) i thought the idea of flaps was so you could approach at a slower speed>?..and land. does it become more stable with the flaps at max deflection>?

you may of just used this as an example for arguments sake....

so ..when coming in for a landing you start with 10º of flaps ...it pitch`s up slightly .you compensate by pushing fwd.....then once it begins to "settle in".. and you add more flaps.(and i would guess throttle)then you begin to pull back. to maintain same speed,, during aproach>?... then it sinks in at what ever speed the aircraft was designed to land at>?