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Cox Engine of The Month
Yet another twin.
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Yet another twin.
These things keep coming up.
http://www.ebay.com/itm/TWIN-CYLINDER-COX-049-MODEL-AIRPLANE-ENGINE-/390977207091?pt=Radio_Control_Parts_Accessories&hash=item5b080ebb33
At least this one looks to have a legitimate attempt to make a crankcase, but it looks like the maker chickened out on trying to come up with a proper crankshaft.
Rod.
http://www.ebay.com/itm/TWIN-CYLINDER-COX-049-MODEL-AIRPLANE-ENGINE-/390977207091?pt=Radio_Control_Parts_Accessories&hash=item5b080ebb33
At least this one looks to have a legitimate attempt to make a crankcase, but it looks like the maker chickened out on trying to come up with a proper crankshaft.
Rod.
Oldenginerod- Top Poster
- Posts : 3973
Join date : 2012-06-15
Age : 61
Location : Drouin, Victoria
Re: Yet another twin.
Yeah, making a crankshaft for that one will be difficult. The pistons should move as "mirrored", in a true boxer engine fashion, and to create such a crankshaft with only one end supported by main bearings... hmmm. I see some strength issues At least this seller points out that there is no crankshaft at all.
That kind of engine might be possible to make using a Medallion or a TeeDee as a donor. You could cut the cases and arrange the cylinders the same way, and substitute the back plate with an extra main bearing. Then with a new boxer crankshaft you would have the necessary pressure/vacuum cycle inside the crankcase and the engine would breathe through the crankshaft as a normal Medallion.
Of course anyone who has the skill and equipment to make a crankshaft for that application could easily whip up a crankcase too, with better results than butchering innocent little engines
That kind of engine might be possible to make using a Medallion or a TeeDee as a donor. You could cut the cases and arrange the cylinders the same way, and substitute the back plate with an extra main bearing. Then with a new boxer crankshaft you would have the necessary pressure/vacuum cycle inside the crankcase and the engine would breathe through the crankshaft as a normal Medallion.
Of course anyone who has the skill and equipment to make a crankshaft for that application could easily whip up a crankcase too, with better results than butchering innocent little engines
KariFS- Diamond Member
- Posts : 2004
Join date : 2014-10-10
Age : 52
ian1954- Diamond Member
- Posts : 2688
Join date : 2011-11-16
Age : 69
Location : England
Re: Yet another twin.
That one has a relatively nice case on it. Milled and joined instead of jbweld.
Phil
Phil
pkrankow- Top Poster
- Posts : 3025
Join date : 2012-10-02
Location : Ohio
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