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Old Mar 16, 2006, 09:15 AM
Registered User
Susquehanna Valley, PA
Joined Jan 2006
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How do I stop stripping threads on Graupner Folders?

I like the Graupner folding props. They look good on the plane, the blades are strong and won't break under high speed "hotlining", but it sure is aggravating to have the allen screws continually stripping the plastic threads when tightening the screws on the yoke. I have a box of blades and worthless yokes.

Does anyone have a "secret" on how to prevent this? Or how to "recondition" the spinner yoke after it's been stripped?

I've tried other collet type folders but the props are cheapos and they break easily.
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Old Mar 16, 2006, 10:00 AM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
Use Graupner collet adapaters and yokes with your existing blades.

.. or just re-thread the plastic hubs and use larger set screws.
..a
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Old Mar 16, 2006, 10:48 AM
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Susquehanna Valley, PA
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Andy

I never heard of Graupner collet adapters. Who sells them? I need adapters for 2.3mm shafts - I use Graupner folders for my 400 size gliders.

Thanks for the "clue" by the way.
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Old Mar 16, 2006, 10:52 AM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
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Ah - the smallest I know of is GPE0703C for 3.2mm..
Just re-rap what you have for a larger screw ..
..a
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Old Mar 16, 2006, 11:04 AM
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Susquehanna Valley, PA
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Yep - the best I could find also was for 3.2 mm shafts. Thanks for the help. I'll figure out something ingenious, I'm sure.
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Old Mar 16, 2006, 11:23 AM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
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Rethreading is really a good idea, as a larger screw will be less likely to strip the nylon anyway..
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Old Mar 16, 2006, 12:05 PM
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Susquehanna Valley, PA
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I agree - and I've already decided to do that.
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Old Mar 16, 2006, 01:33 PM
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Joined Sep 2002
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Try MP Jet spinner sets with Graupner blades. (Collet style and aluminum hubs) Never had a problem with threads. They use pins and C clips.

http://www.aircraft-world.com/shopdi...ers+%2D+MP+JET

Aero Model offers Lite Spinner spinner sets that use nuts and bolts to hold on the blades.

http://www.aero-model.com/litespinner.aspx

SG
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Old Mar 16, 2006, 04:33 PM
modest-master's Avatar
Palm Bay, FL, USA
Joined May 2001
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Here you go:
http://www.espritmodel.com/accesorie...g_spinner.html

Anything from 30mm to 50mm
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Old Mar 16, 2006, 05:21 PM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
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That's great ZB, but I don't see a single 2.3mm adapter on that page..?
..a
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Old Mar 17, 2006, 10:44 AM
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Joel Shreenan's Avatar
United States, GA, Flowery Branch
Joined May 2001
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Quote:
Originally Posted by gus1911
Andy

I never heard of Graupner collet adapters. Who sells them? I need adapters for 2.3mm shafts - I use Graupner folders for my 400 size gliders.

Thanks for the "clue" by the way.
gus1911: Hobby Lobby carries Graupner folding prop/spinners for 2.3mm shafts that use a collet attachment for Speed 400 motors. I've used the GPC06330 (6.3x3) prop/spinner for my Terry and they grip the motor shaft very well (never had one fly off). The screw that attaches the blade to the yoke has never stripped the hole in the plastic yoke because the screw doesn't have to be tightened down to do its job. Tightening the screw too much prevents the blade from folding. The spinner diameter is 38mm. The 6.3x3 prop is about the largest you'd want to go with a direct drive SP-400 motor.

The Aircraft World site has several 2.3mm collet folding prop options which offer better looks and higher precision than the Graupner, but the spinner diameter is limited to 30mm.
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