cox desert defender

mitchg95 Tue Jun 19, 2012 4:51 pm

i got this plane for $15 and the engine is almost brand new, how do i tell if it has a high comp. cylinder head?

microflitedude Tue Jun 19, 2012 4:56 pm

Pics? the head will look like this - rotary knurling.

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mitchg95 Tue Jun 19, 2012 5:05 pm

it does not have the ring roud' the top of the glow head, just checked wikipedia, looks like its a #325 head
the cylinder is a #3

mitchg95 Tue Jun 19, 2012 5:28 pm

how common is this plane? i could not find it on http://www.mh-aerotools.de/airfoils/cox_frameset.htm

happydad Tue Jun 19, 2012 5:43 pm

mitchg95 wrote:i got this plane for $15 and the engine is almost brand new, how do i tell if it has a high comp. cylinder head?

mitchg95: also look and the other side where the "combustion chamber" is. the ones with the smaller chamber are the high compression heads, usually with only 2 fins, but there are some with 3 fins and the knurling on top as seen in your photo. happydad Small Cox Logo

mitchg95 Tue Jun 19, 2012 6:32 pm

happydad wrote:
mitchg95 wrote:i got this plane for $15 and the engine is almost brand new, how do i tell if it has a high comp. cylinder head?

mitchg95: also look and the other side where the "combustion chamber" is. the ones with the smaller chamber are the high compression heads, usually with only 2 fins, but there are some with 3 fins and the knurling on top as seen in your photo. happydad

thanks, the head has 4 fins, looks like a smaller combustion chamber than what i am used to Smile

and as a plus the engine needed no work when i purchased it, just a external cleaning Smile

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