to quote Monty Python, "...and now for something completely different."
i was bored the other day and was itching to do something different. i had recently disassembled my flying mario cart and had been thinking about the 2 contra-rotating motors i had used and wanted to do something similar. i started looking around the plane room and spotted my old Delta wing that i had setup w/ twim EDF's. one of the EDF's had ate itself doing pancakes spins (ooops...

) but other than that it was fine.
i pulled it out, ripped off the remaining EDF, patched the holes, cut a prop slot, designed and printed some motor mounts, and glued on 2 x 2204-2300kv motors!
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testing showed that not only did it balance perfectly with a 3S-1300, but with the 30a esc (major overkill), and the opposing motors, neither was working hard at all. the maiden flight was eventless as expected except for the "Stuka" like siren that the opposing props made. i had a blast dive bombing the field each time i flew.
i am currently using a 5x4.5 speed prop on the front motor, and a 6x4.5 on the rear. my thinking was the front was doing most of the initial work so a smaller prop would allow less load, while still getting the air moving. i went for the bigger 6" in the rear knowing that once again, most of the work had been done and it could easily handle the bigger prop. i will start playing with some different props and sizes and see what gives the best power v. efficiency. if i get crazy, i may swap the cheap HobbySky motors i am currently using for some Emax 2205-2300kv's and go from 2-1 thrust ratio up to 3-1.
if i build another, i will design and print a dual motor mount setup that has both motor mounts connected w/ with cut-out parts that include the base plates (eliminate the balsa) and will make sure that both motors are aligned perfectly straight with each other.
laters,
me