Granbury, TX USA
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You won't be able to run anything bigger than a 10" on the standard 550 due to tip clearance and stability. I would say a 9-4 would be a good prop unless you run motor extensions.
I extended my arms 50mm on each side so that I could run the 10 inch props. I had a descent stability issue on mine due to a lack of tip clearance, but when I added the extensions, they tamed it down a bunch.
Good luck on your decision.
Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX;
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