Kate Bush has been calling again saying, Don't give up, 'cause you have friends! Don't give up, you're not beaten yet! Don't give up, I know you can make counter-rotating propellers work!
Accordingly I have looked again, and settled upon this as a solution: one motor fixed to the rear of the deck and another that can be popped into place and removed if ever the propeller in the background should need replacing.
A rule related to building drones that I've just made up relates to (a) how easily carbon-fibre propellers are damaged and (b) how often they need replacing. This arrangement addresses both issues by proving the necessary protection from damage, whilst still sticking to our 'plug and play' philosophy. Furthermore it still allows the drone to be stored (or dried out) upright.
And whereas the previous arrangement looked a bit of a dog, as our CEO put it, this one looks both purposeful and practical.
I've a recent mail from a hobbyist, saying he too knows when a drive-train just fits if he 'thinks of it constantly and buys it flowers'.
I've removed the email address now.
