Shop our Airplanes Products Drone Products Sales
Thread Tools
Old Apr 30, 2012, 11:45 AM
Thane63 is online now
Find More Posts by Thane63
Registered User
Discussion

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
Last edited by Thane63; May 01, 2012 at 02:14 PM.
Sign up now
to remove ads between posts
Old Apr 30, 2012, 12:04 PM
Ward Hagaman is online now
Find More Posts by Ward Hagaman
Registered User
Ward Hagaman's Avatar
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?
Old Apr 30, 2012, 12:09 PM
BigSwede is offline
Find More Posts by BigSwede
Ninja Master
BigSwede's Avatar
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.
Last edited by BigSwede; Apr 30, 2012 at 12:23 PM.
Old Apr 30, 2012, 12:23 PM
Thane63 is online now
Find More Posts by Thane63
Registered User
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
Old Apr 30, 2012, 12:48 PM
Hutch is offline
Find More Posts by Hutch
Slopeaholic
Hutch's Avatar
Looks super clean Thane! Nice work! Good luck with the chuck!

-hutch
Old Apr 30, 2012, 12:55 PM
Shedofdread is offline
Find More Posts by Shedofdread
Deniable plausibility
Shedofdread's Avatar
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
Old Apr 30, 2012, 01:15 PM
Thane63 is online now
Find More Posts by Thane63
Registered User
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.
Old Apr 30, 2012, 01:18 PM
Thane63 is online now
Find More Posts by Thane63
Registered User
Here's a photo before the servos were mounted.
Old Apr 30, 2012, 01:26 PM
Jack B is offline
Find More Posts by Jack B
Jack
Wow Thane its done. hope to see it in a couple weeks. Is Jims plane done?
Old Apr 30, 2012, 01:30 PM
c0dem0nkey is offline
Find More Posts by c0dem0nkey
I want it to go fast...
c0dem0nkey's Avatar
Plane looks wicked fast. What is the AUW on her?
Old Apr 30, 2012, 01:57 PM
slopemeno is online now
Find More Posts by slopemeno
this space for rent
slopemeno's Avatar
Looks great. I'd love to see some video.
Old Apr 30, 2012, 02:12 PM
droydx is offline
Find More Posts by droydx
Fun ain't cheap!
droydx's Avatar
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
Old Apr 30, 2012, 02:13 PM
winchdoc is online now
Find More Posts by winchdoc
Yes, ALL your money...
winchdoc's Avatar
nice looking plane! Shiny metal gizmos! oh yeah!
Old Apr 30, 2012, 02:36 PM
Thane63 is online now
Find More Posts by Thane63
Registered User
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.
Old Apr 30, 2012, 04:01 PM
c0dem0nkey is offline
Find More Posts by c0dem0nkey
I want it to go fast...
c0dem0nkey's Avatar
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.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion foam pitcheron or TWF kit? hamburger Slope 5 Mar 20, 2012 10:28 AM
Video TWF Tail cam - 2m pitcheron flyonline Sailplane Talk 6 Feb 07, 2010 03:16 AM
Discussion TWF: Pitcheron differential and LE shape? Antonsoarer Slope 4 Jan 25, 2008 08:25 AM
Build Log SSDC 100" Pitcheron, vacuum bagged solid hardwood AndreasMergner Slope 19 Sep 28, 2007 06:58 PM
Discussion TWF Gurus - Pitcheron + elevator = CROW? BillO Slope 20 Aug 02, 2007 01:49 AM