I've done quite a bit of low aerial photography using rc planes and KAP (kite aerial photography) A few things I've learned:
Forget aperture. It won't matter when your shooting from a couple hundred feet.
Smaller sensors are better because you'll never want bokeh. You'll want everything in focus.
Crank up that shutter speed to 1200 and beyond.
Shoot at noon so that you have as few shadows as possible (if you are several hundred feet up and mostly shooting down). Obviously you might vary the time of day depending on your subject, artistic efforts, etc. But usually shadows are bad thing in aerial photography, and because you need extremely high shutter speeds, bright mid-day light is a good thing.
Better to let the ISO creep up a bit than to have a slow shutter speed.
Video is a big problem because of vibration and odd frequencies from propeller motors. It can totally be overcome, but wavy lines are very common for beginners. Stills are easier.
Wide angle is good. The wider the better, because you'll do a lot of cropping, rotating, and you'll need good software to straighten your horizon (which can curve from the lens and from the natural curvature of the earth.
I would recommend the Canon S series.
I also recommend the Canon SX series because you can use Sanyo Eneloops and get about 900 shots per session. I put the camera on continuous (which was essentially one picture per second) at a high shutter speed, focused to infinity and taped down the shutter button. It starts clicking, I place it in the plane (or kite rig) and send it up. The first 50-100 photos are scrapped, the next four or five hundred are good, and as the plane/kite comes Down another 50-100 are scrapped.
Go to APlanding.com for help. It's a slower website bus is a wealth of knowledge. Also, RCgroups is another website with great rc aerial advice.
Good luck and have fun.
My first ever kite photo. 400 feet. Savannah.

This is also a kite shot from when my skills had advanced a bit.
This is the first time I shot a photo from a remote control plane.
Keep in mind this one important rule: it's not a matter of if, but a matter of when. It WILL happen.
