Originally Posted by
AW009
- In case of gear mashing the gear housing never will explode and the cardan shaft wouldn't do the very same as the main rotor of H225LP LN-OJF did in Bergen Crash.
- In (Super) PUMA MRGB the ring gear is part of the housing!
- To incorporate the outer bearing race of the planet gear as part of the gear might be a cheap solution in automotive transmissions, but we are talking about gearboxes in aviations. High quality outer bearing races by press-in conection to the planet gears don’t make much difference in costs, but are an enormous profit in safety and reliability.
Those are precisely the four crucial core issues which were not catched by the very loud ‘engineer’ Lonewolf_50, because he lapsed up to now into a suspicious silence!
In summary: The MRGB of (Super) Puma does not even meet the present standards of automotive engineering.
Points 1 and 3 are the same point worded differently.
An automatic gearbox works by allowing the ring gear to rotate in some ratios and fixing it in others whereas the helicopter gearbox has one ratio only. Apples vs oranges.