Hmm, interesting. This requires a session in google to see what the score is!
The G-Lader is actually one of the more efficient supercharger designs about, only really being beaten by Lysholm screws. G-Lader is more efficient in terms of amount of power required to spin it against the amount of air flow (adiabatic efficiency) and amount of energy wasted as heat, than things like Eatons (and other Rootes blowers) and centrifugal blowers like Rotrex. The problem with them is they are pretty complicated, difficult and expensive to manufacture and can be pretty fragile in comparison with things like rootes blowers. So it makes sense that someone is trying the g-lader again now that more modern materials and manufacturing processes (since the '80s when our g-laders were designed) might make it a more feasible long-term solution.
