On my want to do list is to build a flap controller for my HP16T.

I have been using PIC Microprocessers and pressure sensors that could
easily be adapted to do this. My initial Idea was to install a drag
rake that the microprocesser would read the pressure difference from
and would adjust the flaps accordingly. Alternate ideas are to connect
directly the the Pitot/Static system or build an AoA Sensor. All are
pretty easy to do but good low pressure sensors are in about $100
range and so far my budget hasn't made it to that. I really hadn't
considered AoA sensors until reading this thread, That might be a
cheaper way of doing this.

Brian Case
HP16T N16VP.



On Jul 10, 11:25 am, Udo wrote:
Unfortunately we do not have A of A meter. I have come to the
conclusion that using the flight manual for specific flap setting and
speeds and wing loading is the way to go.
For example: At a gross of 800 lb and a flap setting of +20 the
optimum speed range is about 5-7 kt, about the same in a 45 deg. bank
with the needed extra speed added for that bank.
But in level cruise the minimum drag has a range from about 70 kt to
95 kt at zero flap and 800 lb gross. You will feel the aft loading
of the airfoil in climb at the Flap handle , but no load in cruise.
Due to friction this " flap handle feel", as an indicator is
unreliable and depending on the airfoil also misleading.
I can speak from practical experience. On my past projects I had to
calculate the speeds for each flap setting as well as wing loading
In case of that airfoil it had a very narrow speed range in each flap
setting to maximize performance but it comes at a cost of having to
pay attention to the flaps to get the most out of each setting.
Udo

On Jul 10, 11:49 am, "Ken Kochanski (KK)"
wrote: