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        Discussion Inertia - 100" Pitcheron / TWF

#1 Thane63 Apr 30, 2012 10:45 AM

Inertia - 100" Pitcheron / TWF
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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.


#2 Ward Hagaman Apr 30, 2012 11:04 AM

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?

#3 BigSwede Apr 30, 2012 11:09 AM

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.

#4 Thane63 Apr 30, 2012 11:23 AM

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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.


#5 Hutch Apr 30, 2012 11:48 AM

Looks super clean Thane! Nice work! Good luck with the chuck!


#6 Shedofdread Apr 30, 2012 11:55 AM

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.


#7 Thane63 Apr 30, 2012 12:15 PM

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.

#8 Thane63 Apr 30, 2012 12:18 PM

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Here's a photo before the servos were mounted.

#9 Jack B Apr 30, 2012 12:26 PM

Wow Thane its done. hope to see it in a couple weeks. Is Jims plane done?

#10 c0dem0nkey Apr 30, 2012 12:30 PM

Plane looks wicked fast. What is the AUW on her?

#11 slopemeno Apr 30, 2012 12:57 PM

Looks great. I'd love to see some video.

#12 droydx Apr 30, 2012 01:12 PM

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!


#13 winchdoc Apr 30, 2012 01:13 PM

nice looking plane! Shiny metal gizmos! oh yeah!

#14 Thane63 Apr 30, 2012 01:36 PM

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.

#15 c0dem0nkey Apr 30, 2012 03:01 PM

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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