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I recently purchased a WWII Sperry A-5 Autopilot system. I'm looking for info about what made up the complete system? List of all components? Any other general info like list of aircraft it was used on, How it was used, used with which bomb sights, how much is it worth now, etc I have the...

Grumman XF5F Skyrocket, 2 1200 hp radials and supposedly 380 mph at 20,000 feet. Best guess on top speed at sea level?

Can someone please tell me how to find-locate-define the center-line of a model airplane... I have spent 2 days searching for an example and all I can get is a reference to it, but no visible image or description of where it is. I assume that it's derived from the Cord Line of the airfoil...

There used to be a thread around here for pics like this but I couldn't find it so.... A few days ago while driving to the doctor's office I had the pleasure of coming across this....an Osprey doing circles at treetop level! I don'y know why but I pulled the car over, grabbed my phone/camera...

View: https://www.youtube.com/watch?v=yC4jG-wuVoc