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by HalfaDave Wed Apr 17, 2024 7:28 pm
Cox Engine of The Month
Cox .049’s get a mention in Kitplanes magazine
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Cox .049’s get a mention in Kitplanes magazine
Kitplanes magazine is doing a multi-month article on basic engine design, and in the first installment in the October issue, they reference the Cox .049 when mentioning cylinder design:
“A primary selection is how large to make the cylinder. Larger cylinders – greater diameter, piston stroke, or both – make more power, but when all the physics are considered, one huge cylinder doesn’t cut it. Scaling up an .049 Cox Thimble Drone to lift an RV-10 would lead to teeth-buzzing balancing issues, horrible friction, tremendous fuel waste, and be rather difficult to prop start.”
FYI an RV-10 is a 4-passenger plane with a gross weight of 2,700 pounds that cruises at about 200 MPH. It uses a Lycoming IO-540, about 11,040 times the displacement of our .049's.
The Reporting Mark
“A primary selection is how large to make the cylinder. Larger cylinders – greater diameter, piston stroke, or both – make more power, but when all the physics are considered, one huge cylinder doesn’t cut it. Scaling up an .049 Cox Thimble Drone to lift an RV-10 would lead to teeth-buzzing balancing issues, horrible friction, tremendous fuel waste, and be rather difficult to prop start.”
FYI an RV-10 is a 4-passenger plane with a gross weight of 2,700 pounds that cruises at about 200 MPH. It uses a Lycoming IO-540, about 11,040 times the displacement of our .049's.
The Reporting Mark
batjac- Diamond Member
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Posts : 2333
Join date : 2013-05-22
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Location : Broken Arrow, OK, USA
Re: Cox .049’s get a mention in Kitplanes magazine
How about scaling-up a TeeDe? (I kill myself).
Thanks for that Mark. Neat to see the reference.
Bob
Thanks for that Mark. Neat to see the reference.
Bob
dckrsn- Diamond Member
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Location : Long Island, New York
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