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What crankshafts are these? Cox_ba12




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What crankshafts are these?

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Post  dondaniels59 Fri Nov 17, 2023 9:41 am

I cannot find this style crankshaft or find any reference to it online. Does anybody have information on this crankshaft? What engine they were designed for?

The crank is has straight edges instead of round or scalloped edges.

I included a .049 crankshaft in one picture just for size reference.

What crankshafts are these? Img_2040

What crankshafts are these? Img_2041

What crankshafts are these? Img_2042


Last edited by dondaniels59 on Fri Nov 17, 2023 11:41 am; edited 3 times in total
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Post  gkamysz Fri Nov 17, 2023 10:20 am

It couldn't possibly fit a standard TD .020 case. Maybe these are incomplete? Dimensions could help.

Yes, I can see the non-existent photo. Huh...

What crankshafts are these? A17787723-109-IMG_20231116_203946076~2
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Post  dondaniels59 Fri Nov 17, 2023 11:22 am

Apparently the browser on my phone was really slow and the insert button was not showing up. I restarted my phone and now I can upload the photos.


Last edited by dondaniels59 on Fri Nov 17, 2023 12:39 pm; edited 2 times in total
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Post  Levent Suberk Fri Nov 17, 2023 11:42 am

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Post  dondaniels59 Fri Nov 17, 2023 11:50 am

So it appears that these are helicopter cranks that have been modified. Can they still be used in a TD for an airplane or do they have to be used on a helicopter?
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Post  gkamysz Fri Nov 17, 2023 4:23 pm

Duh, I knew I recognized that shoulder, but was looking for .020. These are probably VA .049 MKI.

http://www.gregorie.org/freeflight/f1j/va/va.html



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Post  944_Jim Mon Nov 27, 2023 4:34 pm

Don,
Any chance you have a digital caliper? I have loose Medallion (.049, .09, .15) and Tee Dee (.049 only) cranks to compare bearing diameters. But I suspect given the difference in crank diameters, you are showing more than just Cox cranks.

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