This mod adds a variety of new blocks that allow you to build compact mechanisms, including for your Valkyrien skies and Create Aeronautics vehicle.

official guide: https://www.youtube.com/watch?v=TYmECfhmdqY

blocks:

Sequential four-speed transmission: A compact gearbox in a single block that lets you change rotational speed quickly and conveniently. Gears: R, N, 1, 2, 3, 4. Provides a GUI to configure the gear ratio for each gear except N.
Rotator: effectively a compact clutch + reverse-gear unit — there is no rotation when no redstone signal is present. When powered from above, below, or by the block itself it reverses the rotation direction. Useful for, for example, compact tank turret builds.
Auto_fuel_pump: automatically pumps fuel into a TFMG (The Factory Must Grow) engine (only while the engine is running). Maximum pumping distance: 2 blocks. (has been removed in 1.0.1 version, it is now replaced by fuel_injector (right-click on a Create pipe).
Compact speed changer: works like the redstone resistor from Clockwork but inverted — increasing the redstone signal increases speed, up to a maximum multiplier of ×2. If there is no redstone signal the rotational speed remains unchanged.
Compact speed changer with clutch: same as Compact speed changer, but when there is no redstone signal rotation is not transmitted.
Compact speed regulator: a compact analogue of the rotation speed controller from Create.

Smart speed Doubler: a simple gearbox with an adjustable multiplier for each of three gears:

1 — default gear (active with no redstone signal),

2 — active when a constant redstone signal is supplied from above,

3 — active when a constant redstone signal is supplied from below.

CO2 scrubber: removes carbon dioxide from TFMG engines.
Injector: halves fuel consumption of TFMG engines (×0.5).

Create: Compact Transmission