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Old Dec 30, 2011, 12:34 AM
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Luis Moya's Avatar
Mexico
Joined May 2004
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Need tips to Avoid Hanging Prop

Most pictures of flyings sailplanes show one blade attached to the fuse and the other hanging.

Neddles to say, my planes also show this behavior. Are there effective tips to avoid the unnecessary drag from the hanging blade?


All the best,

Luis
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Old Dec 30, 2011, 01:13 AM
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United States, PA, Easton
Joined Jan 2009
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A very small rubber band attached to very small hooks will work on Art-Hobby gliders.... I made my hooks out of stainless steel wire, drilled tiny hole near blade root, knotted SS wire, pulled wire thru and made a tiny hook for the rubber band to hook to. When power is off, blades snap back flush to fuselage, I've heard this is popular in Europe....
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Old Dec 30, 2011, 01:43 AM
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Hi Luis,

A rubber loop works fine for me, however I found it needs to be fixed with pieces of tape, at least with the yokes/spinners I do use. Very primitive, I know...

One afterthought: I find opening and closing the canopy pretty annoying when I have to fight the interfering blades

Regards,
Jan
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Old Dec 30, 2011, 04:07 AM
turn, turn, turn.
Athol, Massachusetts
Joined Oct 2005
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Rotate the yoke on the shaft (you may have to grind a flat spot in the shaft in a different location), ....so the blades stop sideways, instead of up and down.
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Old Dec 30, 2011, 07:04 AM
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Belgium, Flemish Region, Oosterzele
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Use the "Reisenauer" clamp spinner/yokes, they have rubber O rings available and the design takes them into account....
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Old Dec 30, 2011, 09:25 AM
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Joined Sep 2008
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I use rubber bands similar to Dingo's method, but with no tape. Make a half twist in each end then slip the loop over the prop hub, the middle loop behind the yoke with the motor shaft inside the loop,then the last loop over the other prop hub. You might have to remove the second prop blade from yoke to get the loop over the hub. Dress the rubber band so it's even and there's no interferance with the spinner or motor screws. Close fitting spinners might not let you use this method. I am not aware of any way to index the prop when stopped as Kenny Sharp suggested. It would be nice if there is one.

Excuse the crude drawing but you can get the idea from it.
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Old Dec 30, 2011, 09:45 AM
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Luis Moya's Avatar
Mexico
Joined May 2004
223 Posts
Quote:
Originally Posted by smewr View Post
A very small rubber band attached to very small hooks will work on Art-Hobby gliders.... I made my hooks out of stainless steel wire, drilled tiny hole near blade root, knotted SS wire, pulled wire thru and made a tiny hook for the rubber band to hook to. When power is off, blades snap back flush to fuselage, I've heard this is popular in Europe....
smewr

This seems to be intuite right, although I have problems visualing your actual implementation. A photo or two could made it clearer.

Thanks a lot,

Luis

Quote:
Originally Posted by DingoII View Post
Hi Luis,

A rubber loop works fine for me, however I found it needs to be fixed with pieces of tape, at least with the yokes/spinners I do use. Very primitive, I know...

One afterthought: I find opening and closing the canopy pretty annoying when I have to fight the interfering blades

Regards,
Jan
Jan,

Clear and simple. I'll try this while waiting for pictures from smewr.

Luis
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Old Dec 30, 2011, 09:51 AM
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Luis Moya's Avatar
Mexico
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Quote:
Originally Posted by Leadchucker View Post
Excuse the crude drawing but you can get the idea from it.

Leadchuker,

Will study your method. Crude drawing beats no drawing every time.

Thanks,

Luis
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Old Dec 30, 2011, 11:29 AM
turn, turn, turn.
Athol, Massachusetts
Joined Oct 2005
10,234 Posts
I've tried rubber bands ...not a huge fan.
WimH knows a lot of solutions ...I'd check out Reisenauer just in case rubber bands keep breaking on you.
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