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Unread 29-06-2003, 19:56
FotoPlasma FotoPlasma is offline
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Re: M. Krass

Quote:
Originally posted by Tytus Gerrish
And here is an intresting pdf...
www.army.mil/usapa/doctrine/DR_pubs/ dr_a/pdf/fm1_514.pdf
id like to point out the part on the combining transmition
Im still looking for more info... so its on the way
Here's a working URL for that PDF.

<edit>
Because of the fact that that PDF is image based, you can't search through it. Also, actual information pertaining to a "combining transmission" seemed a little lacking. This irked me a little, so I searched around a little.
</edit>

Other than that, upon my own investigation of "combining transmissions," it seems they're only used in rotary aircraft (helicopters [namely the Chinook] for the most part).

Here's another website that explains the CH-47 drivetrain's usage of a "combining transmission," or "C-Box," as they like to call it. The images on their website are artificially shrunk, so here're some links to the actual full-size images:

Diagram of CH-47 drivetrain, focusing on how the assembly is integrated into the body of the aircraft.

Conceptual diagram of the actual mechanical set-up of the system.

Assuming the engines are the same, in the concept diagram, they output 15066rpm, which goes through a ~1.23:1 reduction, taking it to 12263rpm, which goes through another reduction of ~1.77:1, taking it to 6912rpm, which goes to the two independant (somewhat) rotors, which have their own ~30.72:1 reduction, before the output shaft (the rotor) which is a nice and manageable 225rpm.

I have no idea what I added to this thread, probably nothing, but there's a little more information about practical usage of this kind of system. *beats a dead horse*

And just for the record, I still love Google.
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Last edited by FotoPlasma : 29-06-2003 at 19:59.
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