Questions tagged [gearbox]

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3answers
101 views

Why would the propeller of a lightsport plane or ultralight w/ Rotax engine be connected to the engine through a clutch, and not turn at low rpm?

Why would the propeller of an ultralight or lightsport plane be connected to the engine through a clutch, and not turn at low rpm? I've often witnessed the engine start of a Bailey-Moyes Dragonfly (...
1
vote
3answers
164 views

Can an automatic gearbox improve engine transmission for an ultralight? [duplicate]

I am working on my dream to build and fly an ultralight aircraft so I wouldn't like to know the following: Does adding a motorcycle automatic gear box to an engine improve on the strength for an ...
2
votes
2answers
133 views

What Oil thickness is used for the geared turbofan jet engine gearbox

In light of the huge operating speed of the geared tubofan gearbox gearing down the fan speed, what Oil thickness is used for the geared turbofan jet engine gearbox and does it use use regular gearbox ...
-5
votes
1answer
152 views

What would happen if one smeared a generous amount of grease on the gears of the geared turbofan jet engine

What would happen if one smeared a generous amount of grease on all the gears or parts of the gearbox of the geared turbofan engine such that no tooth is left without grease to the extent that it is ...
7
votes
2answers
1k views

Gear reduction on large turbofans

Do engines like the GE90 and Trent 1000 use transmissions (planetary gears?) for RPM reduction on the fans, or are they welded directly to the same shaft as the low pressure turbine?
3
votes
1answer
325 views

Is it possible to add “planets” to the gearbox of a Trent 1000?

The gearbox of a geared turbofan engine has 4 reducing gear small wheels being spun by a larger wheel or gear, simultaneously spinning the shaft that is attached to the fan. That is 8 points of ...
1
vote
2answers
622 views

What are the pros and cons of adding a gearbox to larger jet engines?

What are the merits and demerits of adding a gearbox to larger jet engines like the Trent 900. If its about torque, why not use a magnetic gearbox? What are the demerits of using magnetic gearboxes ...