Wooow

This post is becoming very interesting. While reading post I´m waitning for cement to dry, and repairing some minor problems AND discovering very interesting facts

Due to some problem in BEC contacts must test motor and when did [:-] can see clerly that wing is deformed by the thrust !!!!. Show the video please !

[youtube]http://www.youtube.com/watch?v=zsqt_gVrV20[/youtube]


So if agree with Himat, what´s wrong is that the airflow at low rpms / speeds hit the elevator , and at higher rpms the flow becomes paralel to elevator due to the distortion..and then the balance is changed making the nose go down.

At first sight BMatthews opinion seems to be in oposition of Himat´s, but BMatthews is talking only of thrust angle influence, and not of elevator being pushed down by airflow...

I must agree with BOTH , and the next question is:

If modify the tail to a T (really a + ) setup, then the elevator will receive a "centered" airflow and BMatthews "effect" may be more important than Himat´s one. So a good solution for this may be a + tail with more tail moment and the elevator fill moveable wich may be very efficient !!!

Great ! people in this forum is wonderfull !!!