The good news (and was there ever any bad about this?) is that relatively inexpensive carbon-fibre tubes at (!) 22mm are out there in the universe...
... and we'll likely need them before we fly as the sixteenth-inch alloy tubing that we saw yesterday will I fear not be as rigid as we need in order to preclude vibration.
Bear in mind too that I'll be leaving them in native black (though carbon-fibre comes in red now too) and thus I don't need anyone wanting their money back if the product doesn't match the picture... frankly nowadays, when does it ever?
Let's move on however to today's sermon in an effort to keep up the momentum. By way of recap we're looking at using our proprietary offset co-rotating propellers and not the conventional (X-8) co-axial arrangement because:
(a) It's expected to be more efficient, and
(b) We don't need complex motor-mounts.
Accordingly for today's exercise we shall be trialling what I shall call 'dog-bone' motor-mounts. This is one for the whole family to enjoy as it can be done indoors on a table-top like a giant game of Cluedo.
The ingredients include matching propellers, a pen, a sheet of plywood, U7 templates, tins of tuna and (if you can get hold of one) a Nigella Lawson.
The tins of tuna are subbing for motors at this stage because:
(a) In the event of dropping one there are no more tears, and
(b) They make a perfect melted tuna-cheese sub afterwards.
