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1/4A-1/2A propellor mounting food for thought. Cox_ba12




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Post  roddie Sat May 29, 2021 3:26 pm

Found this in a search today.

1/4A-1/2A propellor mounting food for thought. Prop_s10

Huh... Huh...  Curious to know more about how this works. Perhaps there's a magnetic (Samarium-Cobalt type) link involved? If the motors' output-shafts' drive-plate incorporated a square or hex "boss" containing the magnet(s) and the prop's "hub" had a "mating" square or hex FE/iron insert (washer).. might it work?

With such a set-up; a pre-balanced propeller could be fitted to the motor.. by merely pressing it onto the motors' drive-plate.. with a "click" affirmation that its' locked-on?
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Post  dckrsn Sat May 29, 2021 5:33 pm

Did a little head scratching and all I could come up with
is, it's an electric motor application. Not to say it wouldn't
work on a fuel engine, RPM wise.
 How you liking the holiday weekend weather, Roddie? Sad
Watching the Yanks play in Detroit, and it looks beautiful there.
Bob
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Post  roddie Sat May 29, 2021 6:09 pm

@dckrsn wrote:Did a little head scratching and all I could come up with
is, it's an electric motor application. Not to say it wouldn't
work on a fuel engine, RPM wise.
 How you liking the holiday weekend weather, Roddie? Sad
Watching the Yanks play in Detroit, and it looks beautiful there.
Bob

The weather sucks Bob... Laughing
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Post  NEW222 Sun May 30, 2021 1:45 pm

Very interesting roddie. Do you know where you saw that online or what the particular model that was available on? That info may help in a search to find a possible thread on it or review that may show better how it works?
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Post  rsv1cox Sun May 30, 2021 3:48 pm

Curious here too.  Think I would have used "Break away" rather the "Loose".  

Enlarged the picture, looks like foam and electric if the real thing and not a print.  Fuel or electric, I would not want to be in the way without safety glasses if it ever cut "loose."
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Post  gkamysz Sun May 30, 2021 5:03 pm

Looks like plastic parts that snap together. The models there are used on are quite small.

https://www.exhobby.com/products/propeller-and-propeller-saver-shaft-adaptor-for-rc-airplane-761-5?variant=38102168174782
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Post  NEW222 Sun May 30, 2021 5:34 pm

If it wasn't so much there is an Eachines P-51 for sale locally with that design.
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Post  roddie Mon May 31, 2021 11:34 am

@NEW222 wrote:Very interesting roddie. Do you know where you saw that online or what the particular model that was available on? That info may help in a search to find a possible thread on it or review that may show better how it works?

Hi Chancy, I was searching the web for F4U Corsair engine cowlings. You may remember; some 6 years ago, my brother gave me a TopFlite (kit RC-21 circa 1978) that he found at a flea market. It had been opened.. but looked complete except for a missing cowling.

CEF thread-link here

My recent search came up with an electric park-flyer having that break-away propeller system. I can't remember the model manufacturer. I was more interested in the break-away concept.

Neodymium/rare-earth/Samarium-Cobalt magnets have an incredibly strong field. I once harvested a pair from a PC's hard-drive.. and made the mistake of putting one in my jacket pocket.. which already had one in it. The two "snapped" together wile I was holding one.. and it pinched some skin on my finger.. drawing blood. Mad
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Post  NEW222 Mon May 31, 2021 6:18 pm

Here you go roddie. See the video starting at 2:50. Shows the propeller and him seperating it from the motor.
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Post  roddie Mon May 31, 2021 8:55 pm

Hey Chancey! Thanks for finding the model that uses the break-away prop. system. We still don't know how it works though. The magnetic link was my thought.. but it doesn't look like that's what's implied here. Maybe my idea is too far-fetched..
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