A - When starting a hover mower, it should be tilted slightly to allow the air to circulate under the deck, giving it lift. Not doing this could make the lawnmower feel heavy during use.
If your lawn feels 'spongy' underfoot, this could be a result of a build-up of thatch and moss. This causes the machine to be sucked down onto the lawn and prevents in from hovering. This can be remedied by scarifying the lawn. A Flymo lawn rake is the quick and easy way to remove moss and thatch from your lawn.
Also, if there is a build-up of grass cuttings underneath the hood, or in-between the fins on the impeller, then this will prevent the hover mower from hovering. This can be resolved by general care and maintenance.