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Is it possible to stop a propeller at same point- Fauvel AV221

Old 12-31-2019, 09:10 PM
  #1  
baco
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Default Is it possible to stop a propeller at same point- Fauvel AV221

Hi guys
I've a project of a Fauvel Av 221, which has a serious problem. Beeing a flying wing moto-glider the real plane has an unusual feature on his engine cowling. As is possible to see at the picture cowling has a kind of slot to keep folded propeller, wich means that prop must stop at the same position for gliding.
Any ideas, is it available some kind of device, or specific Bec, or some...?
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Old 01-01-2020, 01:13 AM
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quorneng
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As far as I am aware the only option is incorporate some kind of mechanical stop that can only operate on very low or no power. .
Of course a single cylinder IC motor always stops in the same position.
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Old 01-01-2020, 04:14 PM
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Turbojoe
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As can be seen in your picture that aircraft uses a folding propeller. I can honestly say this is the first 1:1 aircraft I've ever seen with a folding prop. (Unless of course it's a model placed to give the photo illusion of size relative to the humans.) Just do a Google search for "folding propeller" and you'll find tons of links on where to buy what you need and in the size you need. I have a few CAM folding props and they work great. Not sure they're even in business anymore though.

Joe
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Old 01-01-2020, 04:37 PM
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quorneng
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Whether its folding prop or not if you want an electric motor to stop at a particular position it will require some sort of mechanical stop.
Most model powered gliders have a slim and almost symmetrical nose profile that allows the prop to fold adequately in any position.

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Old 01-01-2020, 06:15 PM
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baco
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Turbojoe
Picture shows a 1:1 aircraft, one of the very few Fauvel AV 221 existing. A folding prop is not a problem, I use to fit in some of my models. Stop motor (or engine) at exactly same position every time so it folds into the slot existing in the cowl is my problem. Of course I can use a mechanical solution or an electronic if it is available.
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Old 01-01-2020, 07:32 PM
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Turbojoe
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Originally Posted by baco View Post
Turbojoe
Picture shows a 1:1 aircraft, one of the very few Fauvel AV 221 existing. A folding prop is not a problem, I use to fit in some of my models. Stop motor (or engine) at exactly same position every time so it folds into the slot existing in the cowl is my problem. Of course I can use a mechanical solution or an electronic if it is available.
I know of no electronic method available to do what you're asking. Maybe Ron will pop in with an electronic solution if it even exists. If he doesn't know then nobody does.

Joe
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