Talk:Macchi M.C.72

This article is within the scope of the Aviation WikiProject. If you would like to participate, please visit the project page, where you can join the project and see lists of open tasks and task forces. To use this banner, please see the full instructions.AviationWikipedia:WikiProject AviationTemplate:WikiProject Aviationaviation

This article has been checked against the following criteria for B-class status:
Referencing and citation: criterion not met Coverage and accuracy: criterion met Structure: criterion met Grammar and style: criterion met Supporting materials: criterion met

This article is supported by the aircraft project.

One engine or two?

thumb| The video linked at the bottom of this article clearly shows one propeller at a time starting to rotate, as the engine driving it starts. So this and other descriptions should call it a two engine airplane, engines in tandem but both driving puller propellers, with opposite rotation. But how did the rear engine drive its propeller? The shaft can't go through a hole in the crank shaft of the front engine because the connecting rods would hit it. There must be a shaft under the front engine to transmit the power? David R. Ingham (talk) 06:41, 22 November 2012 (UTC)[reply]

It's one engine, as it has always been described as such, some features were shared, and it has no ability to operate as two separate engines. Although it was indeed developed by grafting two V12s together, and they retain separate and uncoupled crankshafts.

It's a V engine, and the shaft from the rear block runs above the forward block, in the valley of the V. I don't recall if this ran at crankshaft speed, or at propeller speed (i.e. if the reduction gear was at the crankshaft or the propeller ends of the shaft). The propellers contra-rotated, I think the engines did too - their design was constructed by reflecting one block behind the other (look at the cam drive gears), not just by placing one behind the other. As is usual in such cases, the two shafts are concentric (at least through the propeller hub) so that the rear block drives the front propeller and v.v. Andy Dingley (talk) 09:47, 22 November 2012 (UTC)[reply]

If it has always been described as one engine, we should conform, but with no mechanical connection and one starting at a time, tandem would seem more descriptive. Engines in the same nacelle with propellers at opposite ends are described as tandem. I spoke 75 years too late. 99.170.145.115 (talk) 20:46, 22 November 2012 (UTC)[reply]

External links modified

Hello fellow Wikipedians,

I have just modified 2 external links on Macchi M.C.72. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

Added archive https://web.archive.org/web/20061006215424/http://aeroweb.lucia.it/en/history/mc72.htm to http://aeroweb.lucia.it/en/history/mc72.htm
Added archive https://web.archive.org/web/20061109214939/http://www.flyandrive.com/Story3.htm to http://www.flyandrive.com/Story3.htm
Added {{dead link}} tag to http://members.xoom.alice.it/_XOOM/mc72/mc72.htm

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

Y An editor has reviewed this edit and fixed any errors that were found.

If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 09:04, 11 January 2018 (UTC)[reply]