One solution to the various issues that face the Engineer of Items of Transport upon the Grid - though these issues I believe to be slowly but surely disappearing, hopefully to be banished into the annals of history, only to be brought out again to scare the newest of new residents, "the Sim Crossing Monster will eat you up and spit you out at 0,0,0 with your shoes in your rear end!" - is of course to design vehicles which are purely attachments.
These are sturdy, reliable things, and much can be done with them. Attention to custom animations is required, as well as careful attention to the current state of the wearer to instruct the device to behave as appropriate (see
llGetAgentInfo and quite possibly
llTakeControls; the former should be polled regularly on a timer, and appropriate link messages sent out for changes in status). Acceleration of the wearer, driver or pilot can be achieved with the use of
I recently released photographs of my old compatriot Professor Gould's Hovering Chair Device Thingy, and last night was reminded of this particular form of movement by the approach of Per Lagerkvist in a rattly Motorised Wheeled Chair. On the ground it moves back and forward with spinning wheels, chugging away, and when one takes to the air, Rotary Wings are extruded to allow powered flight. The little flag upon the mast can even be changed to different designs! I was most impressed.
More can be found at the Lagerkvist Inc HQ, Jeju (250, 170, 84).