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That's a jolly complicated mechanism I wonder what advantages it was supposed to have over a more conventional design?
Quote from: Roger B on March 07, 2015, 07:05:55 PMThat's a jolly complicated mechanism I wonder what advantages it was supposed to have over a more conventional design?A cam has the advantage of slowing the crank speed for a given firing rate (each piston completes all four strokes in one revolution ) so potentially giving more power while removing the need for a gearbox. The main problem for this, and the similar Caminez engine, is that the large reciprocating mass verses the relatively low rotating mass of the crank and prop causes a torsional vibration that is/was difficult to control in a light aircraft.
>Aircraft never rolled under own power. Actually the Caminez did fly: (perhaps you mean the marchetti?)
To my eye the Marchetti looks to have a greater problem : 8 pistons, conrods, bearings etc. all stopping and starting at one time
Yes, an eight cylinder at 45 degrees would have helped with the fourth order torque problem :-) >Aircraft never rolled under own power. Actually the Caminez did fly: (perhaps you mean the marchetti?)"The Fairchild-Caminez 447 was first flown in an Avro 504 from Farmdale, Long Island, New York, in 1926. It was successfully endurance-tested in 1927, and was the first ever axial engine to receive a US Dept of commerce type certificate. "To my eye the Marchetti looks to have a greater problem : 8 pistons, conrods, bearings etc. all stopping and starting at one time
I downloaded the Solidworks PDF from curiosity. I'm wondering what you don't also include the SW parts files for download.
Hi all,I found this thread a few years back while researching a different cam engine, the Fairchild Caminez 447-C. Thanks to Wesley's impressive work I was inspired to start working on that design to produce an air powered model of my own. Like Wesley I am a student, so progress has been slow, but I am finalizing my designs and hope to start machining in a month or so.Currently I am working on the cylinders and pistons, and am stumped on how to get the timing for the compressed air figured out. I saw mention of an automatic exhaust valve idea and was curious if you folks knew more. Since Wesley and my projects are similar I though it might be a good approach instead of also designing my own push rods, cam etc.I don't mean to clutter up this thread but if anyone has any advice that would be much appreciated. Feel free to post here or PM me. This is my first post on this forum so I am not familiar with how everything works yet.-Jack