I'm taking my 50D with the 70-200 f/4 for in close (and static) stuff and my 7D with the 100-400 for the aerial this year. Looking forward to having a choice on the ground and not having to swap lenses around spinning blades.
Still trying to figure out the sweet spot for the 7D. It doesn't appear to need to be set as low as the 50D.
to the OP: for what its worth. 1/100 is a great ss for prop blur if you can keep it steady. But as I was saying above, my 7D gets the same results at higher speeds....like 1/160 for example. If you can, head to a local airfield and dial it in in advance of going to a show.
I'm only in my 2nd full year so take what I say with a grain of salt but I spend just about a full day a week at my local airstrip practising haha.