How much does a 6 pack weight?

Isn't that why you have a dog, Mark? ;)

Noel and Mark - Now if you could train a dog to carry one of those Heinekin little barrels like a Newfoundland does a brandy cask ... Actually, this seems like a clever solution, no 'swivelling' wings or rotors to add complexity, just a flight computer - and it looks like it works! Now if it will scale up, but it depends on weight V size I suppose, it could be a very versatile solution for many worries on limited access (forest clearings? or tight city plazas?) for a lot of uses.

Once in use, how long before the delivery drones get shot down by thieves hoping to help themselves to the contents, and the components of the aircraft?

There is going to be the need for an onboard camera - and thus increased payload - to record deliveries because as sure as eggs is eggs there are some who will claim that what they ordered did not arrive.

This is a fab device. Obviously it's going to have to be quite a bit larger to carry any sort of payload.
Is this supposed to hover outside your front door waiting for you to realise it's there?
if this could be just scaled up to carry a man, then we would have a wonderful flying machine. Surely it would be possible to have a small Wankel engine, driving four propellers?

This problem was was solved about 15 years ago by Hugh Schmittle of Freewing. He called his drone: Manta.

@ Nik Five minutes in the USofA ten elsewhere.

This architecture (term?) is a German idea that was made into at least 3 different experimental aircraft in the '50s. 1 of the problems with them was that the pilots couldn't see the ground while landing, not a problem for a drone. But a drone will still be blown sideways by strong winds while it is in vertical flight.

It does not show the change from vertical to horizontal flight and vice versa. That is the issue the engineers are trying to solve not the vertical flight and the horizontal flight individually of any vehicle, which had been solved for over a 100 years.