Yes, one Opto for each ESC.
That way you will have different circuits for power and control.
When I talk about “control” Is because you can guaranty the APM will have a constant and clean Supply, not the unreliable one coming…"
"As a rule I always use a separate battery for the control section + a BEC If needed, and for quads I also recommend Opto-isolator for each ESC.
ONLY with the control battery plugged you can upload firmware, program, play without any risk. Then when…"
"Many groups have sent video packages to near space, (recently a team from Sherwood Park, Alberta Canada, near where I live)
Also one of our members here at DIYDrones rec'd alot of media attention years ago...TJ Bordelon, has been there, done…"
What are you going to use as clutch or one way bearing between the rotor and each drive chain?
Without that, after engine or bevel gear failure would be impossible to perform an autorotation.
Probably a good idea is to make…"
USB connector (top-left)
Infrared sensors XYZ Horizon connector (bottom-right)
I2C conector for pressure sensor (SCP1000) or magnetometer (HMC5843) (bottom)
The left “strange” pads could serve to ppm encoder in order to…"
Nice board! As you said quite big…
Here my guess for the oil pan:
-FTDI chip (top-left)
-Differential Pressure Sensor MPXV5004DP (top-right)
-Gyro LPR530AL for Pitch and Roll (center)
-Gyro LPY530AL for…"
"You can go with:
APC 10 x 4.7 Slow Flyer Pusher Propeller (APC10047SFP) for clockwise
APC 10x4.7 Slow Flyer Propeller (APC10047SF) for counterclockwise
Of course depends on your motor and ESC.
www.amainhobbies.com has them in…"
"The SF board worked fine for me, BUT be aware about one diode that in some boards is in the wrong direction.
Please find the schematics (*.pdf) from SF where the show the diode in the WRONG direction. Actually some boards have it that way…"
"My only concern is the Video Tx is very close to ESC and motor.
Also be very careful with the video tx power supply cable it shouldn’t pass near the rx antennas or be glued to the receiver. I would not recommend wrapping the satellite cable,…"