JGR wrote:I don't honestly think it could take 3 tonnes of fuel for one kilo of weight. That sounds like it'd never get off the ground due to the weight of the fuel requiring more fuel than there is fuel. I agree that the base was ridiculously huge though.
The fuel for extra weight is for a complete, already loaded design. As in, it would take another 3 tonnes of fuel to carry that extra kilo across the distance, not 3 tonnes for any
kilo of mass. Just like if you go on a plane and have to pay extra for taking on too much luggage. Remember in this case most of the fuel needed would be to get the craft off Earth in the first place.
I suppose I should point out that I liked the episode in general, though did wonder why he didn't take them to a different planet about halfway through. Then again I would have preferred it if the Doctor had to be the one to blow them and the base up, as opposed to what happened.