Why does nose drops after gear up?

[Bolelas]

At first glance it seems wrong. But i read some article about a device (prototipe) to counteract this efect. So, it probably means this happens. (and i am not including flaps in it, this was second question)

"It is known that aircraft in flight, when lowering retractable landing gears in preparation for landing, experience a nose up condition."

I got it from here:http://www.google.com/patents/US3045954

It is the other way around, but samething. Thx for you answer Mr Freddie.

[MaxGunz]

When you speed up or slow down, your lift changes and you need to change pitch, maybe do that without thinking, but it's flaps that change your center of lift.

IIRC, CoL changes some with AoA.