Reply to post: Re: No...

Hi-torque tank engines: EXTREME car hacking with The Register

Brian Morrison

Re: No...

Yes, it's the idler gear for reverse together with the corresponding main and layshaft gears that are straight cut.

Straight cut gears also led to the demise of Bristol Britannia prototype G-ALRX that was crash landed on the Severn mud flats after the straight cut reduction gear started vibration at the natural tooth frequency and broke up, the engine accelerated with no load and the resulting turbine failure set fire to the oil tank in the wing.

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