Mai,
My suggestion on props would be around 50-55 diameter and 1.2-1.4 pitch. For speed in a scale sense you would be flying at 35mph I would think. With 56 series motors you only need to go 92 mm in length, the longer cans will just draw more amps. You may get away with 40mm cans with the right props, = less cost! Seaking HV 130 ESC's will do the trick but you probably only need 6-8s as well. 8S gives just under 15K rpm unloaded, x 2 screws will be plenty of speed. Hobbyking have Multistar batteries in 4 & 6S at 20000mah. I use these in my endurance offshore boat for runtimes of 20 mins (max). The lower you get your amp draw the longer the runtimes. You will be looking to keep the amps down around 40-50 amps for decent runtime. These are all suggestions as unless you can find someone who has built a similar setup then you have no actual starting point. You will need to be prepared to test and try different props, Octura have a range of 1.2 and 1.3 props but you will probably have to settle for 3 blades, bearing in mind that the more blades equals more current draw, two blades may also be sufficient.
NZMPBA 2013, 2016 Open Electric Champion. NZMPBA 2016 P Offshore Champion.
2016 SUHA Q Sport Hydro Hi Points Champion.
BOPMPBC Open Mono, Open Electric Champion.
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