srt10

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I wonder if anyone builds a V twin that could be used here?

mooman007uk

I found this vtwin zenoah...[link]http://www.youtube.com/watch?v=13oPgkWvrb8&feature=related[/link] though it looks like 2 engines bolted together with a plate and not a common crankshaft

SAVAGEJIM

That is a novel idea, to couple a pair of engines to one crank shaft. Of course, in an RC, you will have to mount the engine backwards because the coupling crankshaft will turn the opposite directn.

srt10

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Great find man!
and that sounded really cool..

SAVAGEJIM

I just thought of another thing: I guess in boats, having the shaft turn in a negative turning function (clockwise when looking at the front of the engine) is not a problem so long as your prop screws are designed to move water to the rear of the both while turning in that negative rotation.

Otherwise, you would have to turn the engines around too in this case and make the PTO part of the crankshaft come out the front side of that plate holding that coupling crankshaft.

Likewise in CR cars and trucks.

sheograth

That zenoah V-twin is real nice. Wonder how it compares to the more common inline twins used in boats.

SAVAGEJIM

That is a very good question. I guess assuming a 2cylinder in-line and this v-config with a coupling crankshaft, the in-line 2cylinder has the benefit of one less moving part (their cranks are coupled together directly in line, no gears for that) and thus also less friction from gear teeth mesh interface because that is one less gear that has to be turned. Also, the inline 2 cylinder would be lighter and smaller, so it can fit into a shallower hull will keeping the center of mass low and closer to the waterline.

srt10

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http://www.youtube.com/watch?v=13oPg...eature=related
the video is of two motors mounted side by side..
it had twin drives
so I canot call that a true V-Twin