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Cox Engine of The Month
June-2024
F4D Phantom II's

"Cox .049 Marine inboard engine."

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Post  OneWingLow Sun Mar 19, 2017 6:32 pm

Since my first post I won the bidding on an Aurora B-25.  Photos are attached.

Did all B-25s come with .060 engines?

Thanks, Hadrian

Aurora B-25 B25a10
Aurora B-25 B25b10
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Post  Mark Boesen Sun Mar 19, 2017 11:44 pm

Yes,
K&B designed the Aurora Tornado engines and in '60 Aurora bought K&B, they needed more pop to pull larger plane, so in '60 they intro'd the B-25 with new .060 engines, stamped 'K&B .060' on the bottom of case.
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Post  Madguns Tue May 23, 2017 3:58 am

You have an awesome plane there. I'd really like one for my collection as well.
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Post  getback Tue May 23, 2017 8:40 am

Lucky you !! Thats a fine example of ma B-25 Thumbs Up bounce
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Post  GallopingGhostler Tue May 23, 2017 11:02 am

OneWingLow wrote:Since my first post I won the bidding on an Aurora B-25.  Photos are attached. Did all B-25s come with .060 engines? Thanks, Hadrian

Aurora B-25 B25a10

Nice mint condition B-25, Hadrian, congrats. Thumbs Up It is amazing the quality of items 57 years ago. Are these K&B engines the reed valve version? Sceptre Flight has the March 1961 Model Aircraft test report on the .049 Tornado version:

sceptreflight.com Model Engine Tests/K&B Tornado .049

It put out about the same power as the Cox Babe Bee, may be a touch more. With a 22% increase in engine displacement, it would be understandable why the upsize with a heavier plane.

OK Cub when they came out with their reed valve, upsized it to .059 (.06). From what I heard, it produced decent power comparable to the Cox Babe Bee.

Leroy Cox was able to produce his reed valve .049's cheaper with better quality than the others, and by the mid 1960's the competition discontinued their efforts as they couldn't compete. Wen Mac later Testors continue selling their .049's, and Herkimer their OK Cubs.

In 1973, I ordered an OS Pet .06 for more power in my Goldberg 1/2-A Junior Falcon on single channel, but the now defunct Hobby Shack substituted an OS Max .10R/C cross scavenge at no additional cost, a sweet deal. sunny (Sorry for departing off topic.) Paranoid - George
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Post  Mark Boesen Tue May 23, 2017 5:37 pm

Mark Boesen wrote:Yes,
K&B designed the Aurora Tornado engines and in '60 Aurora bought K&B, they needed more pop to pull larger plane, so in '60 they intro'd the B-25 with new .060 engines, stamped 'K&B .060' on the bottom of case.
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