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the formula for engine weight for non-airship/non rail Support vehicles is:

Engine weight= Base engine value x movement factor x engine weight multiplier x Total vehicle weight
with movement factor being desired Speed times desired Speed plus 4

with a Little math we get: movement factor x vehicle weight = engine weight /base engine value /engine weight Multiplier
so for any engine weight and model we get a value that i will call Mft movementfactortons
an engine that provides 29 MF to a 1000 ton vehicle(for a Speed of 5) produces 29000 Mft

first rule: to give a Support vehicle with a weight of Y tons a speed of X it Needs engines providing Y((XtimesX)+4) Mft

second rule: when a Support vehicle has several engines the Speed is: root of(sum of all Movement factors)-4; round down.
Example: the MF of all installed engines sums up to 104; sum of all Movement factors -4=100; the root thereoff is 10, the Speed of the vehicle is 10

third rule: when only part of the engines is engaged the Speed calculates as above, ignoring the engines that are not used.

example: the SV has one engine that reaches a MF of 53 and one that is constructed for a MF of 51; with the first engine it reaches a Speed of root of (53-4) = 7
with the other engine it reaches root of (51-4)rounded down= 6
with both engines it reaches root of (53+51-4)=10

what sense does this make?
- when an existing engine is installed in another vehícle the Mft can be calculated, divided by the weight of the new vehicle(round down) you can calculate the the Mf of the new vehicle.
- when several engines are installed into a new vehicle the sum of the Mft could be calculated and divided by the weight of the vehicle to find out what Mf the new vehicle would get
- most important: it becomes possible to construct vehicles with different types of engines, for example a freighter could have a Fusion engine for a Speed of 7, and auxilliary engines for a combined Speed of 10. this means that the freighter has infinite range with a Speed of 7 because of the Fusion engine, but it could also operate at a Speed of 10 as Long as the fuel allows and it could probably operate on a Speed of 6 or 7without using the Fusion engine in case the Fusion engine would be damaged.it could have a Fusion engine for a Mf of 53 (7x7+4) and two ICE engines for a Mf of 29(5x5+4)each, this means it could operate on one ICE-engine at a Speed of 5, two ICE engines at a Speed of 7(29+29 is 58; root of 58-7, rounded down, is 7)or with all engines engaged it could travel with a Speed of 10 (29+29+53=111; the root of 111-4, rounded down, is 10)


the base engine value and engine weight Multiplier depend on the Technology the engine has, an engine of a TL B vessel installed in a TL A vessel would Keep ist weight and the power it could provide.

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typos and spelling-mistakes are property of the finder. english is not my mother-tongue.