An advantage of stepping away from the vehicle from time to time is those insights that emerge from reflection. To date I've three frames in the wings: a first that one which needed to be fitted with a 20" airscrew instead of the 22" in stock, set for the national small boat collection in the UK should our design come good; a second like the first but fitted with said 22" propeller at its leading edge; a third identical while set for contra-rotating propellers at the rear that eliminates the need for a rudder.
The diagram shows how, tempting as it might be, one of these motors can't be fixed to the leading edge where it would 'walk' the deck in the same direction and have it going around in circles at low speed. Notice instead how with each propeller piercing the waterline, one yaws the craft in one direction and the other: the other.
At planing speeds, differential operation of each motor should roll the craft in one or other direction; though there'll only be one way of finding out...
There's been a decline of over 50% in the appearance of semi-colons over the past two decades, and in this post they roam free. I run a home for unwanted semi-colons in the UK, and you can donate at the merch page on the TELEDRONE website.
