(previous entries over the years have also mostly/always been rockets).
Are you absolutely sure on that?
The last rocket powered holder of the LSR was before Thrust 2 - and there's only been one rocket car thats held the record. Record was set in 1970 and was broken by Richard Noble in Thrust2 in 1983
Most recent cars have been turbojet engines, only Thrust SSC used the Turbofan engine design successfully.
The last car that was wheel driven to hold the overall LSR was in 1937. The current wheel driven LSR is around 450mph iirc.
All the the FIA states as requirements for the Land Speed Record is :
Land Vehicle : Vehicle propelled by its own means in constant contact with the ground either directly by mechanical means or indirectly by ground effect, and the motive power and steering system of which are constantly and entirely controlled by a driver on board the vehicle.
So, must have a driver on board steering and controlling the forward motion and must be in contact with the ground. Thats it.
There are so many classes for the Land Speed Record that it's unbelievable really.
In Category A - there are 13 groups *engine type*, each with 11 classes *engine capacity* and then 3 sub classes *unladen weight*
Category B - Another 13 groups, this time with 18 classes and then the 3 sub classes
Category C - Specials Vehicles *which is what Thrust 2, Thrust SSC, Spirit of America etc... fall under - and is really anything goes...*
Category D - Drag Racers - this follows the FIA Drag Racing regulations.
That gives the possibility for well over 1100 individual Land Speed Records... *my mental calculations produced something in the region of 1130 for the first 2 categories by themselves...*
Also, are you so against the Water Speed Record as well? Even Donald Campbell was using a jet engine to push himself along rather than a prop or a water jet?