I've watched a number of the youtube videos with the OpenRovs' in action. What i have picked up is the slight tendancy of the unit to torque roll.
I'm assuming this is because of the force exerted by the twin propellers spinning in the same direction?
In order that this can be eliminated, i'm planning on purchasing equivalent sized contra rotating props and swapping the wires on the ESC > brushless motors.
1. "The prop shop". Bespoke propellers, approx £40, lead time 3 weeks.... http://www.prop-shop.co.uk/
or2. Cornwall model boats, COTS propellers, http://www.cornwallmodelboats.co.uk/acatalog/propellers.html
Has anyone tried this?