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Post  mitchg95 Sun Aug 26, 2012 12:33 am

how will this affect rpm on a golden bee with a black widow #1 cylinder and piston?
thanks
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Post  RknRusty Sun Aug 26, 2012 2:16 am

mitchg95 wrote:how will this affect rpm on a golden bee with a black widow #1 cylinder and piston?
thanks
http://www.ebay.com/itm/Du-Bro-Cox-Spinner-Prop-Nut-DUB777-/160527785025
If that's it it should be fine. It says it comes with an aluminum screw, but I think that's a misprint, the picture looks like a black oxide steel screw which is what most of us use.

Here's the package.
http://www.hobbylinc.com/htm/dub/dub777.htm

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Post  PV Pilot Sun Aug 26, 2012 5:55 am

I have one of the Dubro spinners,,very, very heavy. I would avoid them.
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Post  lousyflyer Sun Aug 26, 2012 8:18 am

I have a DuBro spinner, as previously mentioned it is huge. I've never run mine (yet).

I did weigh them:
Stock Cox unit = 2.95grams w/screw
DuBro = 11.6grams w/screw

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Post  microflitedude Sun Aug 26, 2012 11:19 am

11 grams... Wow.

Not very practical unless you have a very tail heavy airplane! Shocked
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Post  mitchg95 Sun Aug 26, 2012 11:54 am

wow 11g's ill just use that on my slower engines, not on my speed gb
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Post  RknRusty Sun Aug 26, 2012 12:44 pm

I posted this early this morning but I must have forgotten to click Send. But I'll try again:

Unless you like to fly slow and peacefully, this would be a good one to avoid. The weight of the spinning mass is extremely critical to the planes ability to perform aerobatics. If you ever need to add front end weight for balance, a little more weight back closer to the CG performs better than a slightly lighter balancing weight extremely far forward. In front of the prop is the worst place you can add weight.

I learned that from this article:
http://flyinglines.org/mckay.trimming.html


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Post  PV Pilot Sun Aug 26, 2012 12:52 pm

That big spinner is like a tuning fork on your crank. I tried mine on a old Babe Bee and once it came up to rpms, it was vibrating big time with a well balanced prop. Shut it down, took it off and tossed it in the parts bin.
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