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Old Apr 30, 2012, 11:45 AM
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Joined Nov 2004
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Inertia - 100" Pitcheron / TWF

I convinced a good friend of mine Jim, that we should each build a pair of pitcherons that I had been dreaming up for a couple of years now. He hasn't said it, but I'm sure he wondering what he got him self into. It's been a struggle at times.

The design called for a 100" wingspan, able to fit inside a packing case so a cross tail is mandatory, thin airfoils optimized for fast huge air carving & the largest diameter wing rod possible to take the abuse of the Dragons Teeth. The construction is all carbon. Uni on the bagged wings & carbon sock on the fuse.

The twisty hardware uses 3 thrust bearings capturing two flanges that rotate independently. The wing rod does not carry thru, but is split in the middle and each half slides into the rotating flanges. It's hard to describe & unfortunately I don't have any photos of it not installed. I hope it works.

I hope to maiden it in a couple of weeks at Wilson Lake during the MWSC.

Thane
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Old Apr 30, 2012, 12:04 PM
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Ward Hagaman's Avatar
San Diego
Joined Mar 2003
2,320 Posts
Beautiful! Nice job molding, too! I love the slip on nose! I hope you can video her maiden flight!

So...what exactly is going to take the span wise bending load?
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Old Apr 30, 2012, 12:09 PM
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United States, CA, Thousand Oaks
Joined Feb 2007
1,771 Posts
Wow! Looks amazing! I've been thinking about a 100" wingeron/pitcheron for a while. I don't think I'll get to building one for a long time though. Your ship looks great. Good luck on your maiden.
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Old Apr 30, 2012, 12:23 PM
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Joined Nov 2004
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Ward, the loads are carried by the thrust bearings & flanges working against each other.

I hope it works, if not I'll be giving you a shout.

Thane
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Old Apr 30, 2012, 12:48 PM
Slopeaholic
Hutch's Avatar
Roseville, California, United States
Joined Mar 2001
3,098 Posts
Looks super clean Thane! Nice work! Good luck with the chuck!

-hutch
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Old Apr 30, 2012, 12:55 PM
Deniable plausibility
Shedofdread's Avatar
Derbyshire, UK
Joined Aug 2008
2,327 Posts
Elegant airframe and lovely workmanship

Have you locked the wing rods to the rotary bearings and is the frame that carries the servos / bearings very strong? I think I get what you're doing but there may be some odd loads in the fuselage. Or I may have got it completely wrong

Best of luck for the maiden flight.

S
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Old Apr 30, 2012, 01:15 PM
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The side rails are 0.25" 6061-T6 that squeeze the flanges & bearings together with four 10-32 aircraft grade screws. In a positive bending load situation the bottom of the flanges will want to spread apart & are held from doing so by the rails, while the top of the flanges are compressed against each other. The thrust bearings hopefully keep everything running smooth.
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Old Apr 30, 2012, 01:18 PM
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Here's a photo before the servos were mounted.
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Old Apr 30, 2012, 01:26 PM
Jack
United States, NE, Lincoln
Joined Dec 2005
36 Posts
Wow Thane its done. hope to see it in a couple weeks. Is Jims plane done?
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Old Apr 30, 2012, 01:30 PM
I want it to go fast...
c0dem0nkey's Avatar
San Diego
Joined Sep 2006
797 Posts
Plane looks wicked fast. What is the AUW on her?
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Old Apr 30, 2012, 01:57 PM
more casual than stylish....
slopemeno's Avatar
Joined Jan 2003
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Looks great. I'd love to see some video.
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Old Apr 30, 2012, 02:12 PM
Fun ain't cheap!
droydx's Avatar
United States, CA, Santa Barbara
Joined Apr 2003
3,035 Posts
Very nice, should really be a big air carver...hope you have a great landing area, because your workmanship is so awesome, it'd be a real bummer to 'nack it up after one great flight (been there - done that, many times myself!)

Thanks for sharing, hope to see super positive maiden results!

Andy
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Old Apr 30, 2012, 02:13 PM
Yes, ALL your money...
winchdoc's Avatar
A hut in the woods in Oregon
Joined Jan 2003
2,536 Posts
nice looking plane! Shiny metal gizmos! oh yeah!
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Old Apr 30, 2012, 02:36 PM
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Jack, I know Jim's getting close. He hopes to have it ready for the slope challenge.

The AUW is at 79 oz.

Landing is a major concern. With the slip on nose cone, winchdocs canopy brake is out. I'm going to give it a go with no system at all for now. I have access to some hills with open stretches of pasture ground for landing zones. Hopefully it all works out. maybe a drag chute is in the future.
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Old Apr 30, 2012, 04:01 PM
I want it to go fast...
c0dem0nkey's Avatar
San Diego
Joined Sep 2006
797 Posts
Would love to collaborate on the drag chute idea...I know its a one shot deal but I think with the right setup there would be no need to fly around for another landing.
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