RC Scale Aircraft Discuss rc scale aircraft here (for giant scale see category above)

Andy Sheber Pitts s1s

Reply
Old 01-02-2013, 05:40 AM
  #401
john josey
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 977
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

A triangular structure is the strongest there is, so i would defo add the cross brace Robert. It may not be needed, but there is no benifit to not fiting it.

The cabane's on my own are a completely different set-up. TC has used 3mm piano wire with the aerofoil section being fabricated from oval shaped balsa halfs with the recess cut out the middle to fit over the piano wire. The piano wire is fixed to the fusalage with what can only be described as threaded eyelets. If you were to take a piece of threaded rod about 1" long and hammer one end flat then drill a hole that the piano wire can pass through then drill a hole in the fusalage side and pass the threaded part through, and a washer and nut to pull the wire tight against the fusalage side to the piont that you cand move it by hand but tight enough that the wire wont fall under it's own weight. With that done, you can make very small, accurate adjustments for alignment before you tighten the nuts fully, then smear the whole lot with epoxy.
john josey is offline  
Reply With Quote
Old 01-02-2013, 06:39 AM
  #402
acerc
Thread Starter
 
acerc's Avatar
 
Join Date: Sep 2006
Location: The Sunshine state, when it's not raining!
Posts: 8,108
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

Man you guy's have a way of making one paranoid. So, I went looking for a solution for a little more reinforcement with minimum weight gain. Here is what I came up with. In the pic the red circles are where the struts exit the fuse. At that point there is a 3/16 x 1/2" hardwood rail. The hardwood rail will actually have to be contoured for the struts, the black marker in the yellow circles. I will make a smallbracket to fasten the cabane to these hardwood rails. I think this will add the needed support at the center of the cabane's.
acerc is offline  
Reply With Quote
Old 01-02-2013, 07:15 AM
  #403
john josey
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 977
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

I think thats a good idea Robert, it'll give you peace of mind.
john josey is offline  
Reply With Quote
Old 01-02-2013, 08:45 AM
  #404
RickBoyer
 
Join Date: Mar 2002
Location: Fleetwood, PA
Posts: 189
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

Hey Robert,

I used airfoil shaped Chrome Moly, jig aligned and tig welded together, on my Pitts cabane assembly since the drawing called for using welded steel brake line (flattened in a similar fashion to your brass method). I also used flat stainless sheet machined down to a square profile with a hole drilled in the middle, to accept a machine screw and locking nut which secured the assembly in four places to the bulkheads.

Be careful with brass since it is allot softer than CM or stainless.....

Just say'n,

Rick Boyer

Top Gun 2004-2012
Pitts Special S-1S (#1)
Ryan STA
Pitts Special S-1S (#2)

RickBoyer is offline  
Reply With Quote
Old 01-02-2013, 09:00 AM
  #405
acerc
Thread Starter
 
acerc's Avatar
 
Join Date: Sep 2006
Location: The Sunshine state, when it's not raining!
Posts: 8,108
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

Hi Rick! How are you doing? What are you bringing to TG this year. I appreciate your concern and you may very well be right. But not having the welding equipment or skill I have to find other avenues. The cabanes will be bolted to the bulkheads and the hardwood runner at the top of fuse. If it turns out not to be strong enough I'll get to do it again. Now if someone (hint, hint)was willing to jig one up and weld it, I would be most appreciative. And willing to pay. I don't, personally, know anyone that is capable of doing such.
acerc is offline  
Reply With Quote
Old 01-02-2013, 09:48 AM
  #406
acerc
Thread Starter
 
acerc's Avatar
 
Join Date: Sep 2006
Location: The Sunshine state, when it's not raining!
Posts: 8,108
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

Any volunteers?
acerc is offline  
Reply With Quote
Old 01-02-2013, 12:58 PM
  #407
acerc
Thread Starter
 
acerc's Avatar
 
Join Date: Sep 2006
Location: The Sunshine state, when it's not raining!
Posts: 8,108
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

Not much done today, just not in the mood I guess. But I have managed to get the wing cabane mounts made.
acerc is offline  
Reply With Quote
Old 01-02-2013, 03:56 PM
  #408
WacoNut
 
WacoNut's Avatar
 
Join Date: Jan 2005
Location: Blanchester, OH
Posts: 6,562
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

Robert,

Hard to tell from your pics but can you run music wire thru your streamlined tubing and silver solder a lug at each end for attaching to the mounts? I would then JB Weld the brass over the music wire.

This would help strength wise, I would be a bit skiddish of the brass. I think you will be fine with pulling and compression forces it is any side load forces you will encounter that worries me with brass. As squirrely as a Pitts can be on the ground and also doing snaps and such you will see alot of side load.

Not trying to worry you just an opinion.
Later!!
Anthony
WacoNut is offline  
Reply With Quote
Old 01-02-2013, 05:15 PM
  #409
john josey
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 977
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

I think the flying wires might be functional on your pitts Robert.
john josey is offline  
Reply With Quote
Old 01-02-2013, 05:47 PM
  #410
acerc
Thread Starter
 
acerc's Avatar
 
Join Date: Sep 2006
Location: The Sunshine state, when it's not raining!
Posts: 8,108
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

Ok! All this over my cabanes got me thinking. I don't know why but a thought popped in my head and thought I'd try it.
Look at the photo. Now keep in mind I only weigh 170lbs. All my left foot is doing is keeping balance. There will be two, front and rear.
acerc is offline  
Reply With Quote
Old 01-02-2013, 06:03 PM
  #411
flyingagin
 
flyingagin's Avatar
 
Join Date: Feb 2009
Location: Modesto, Ca
Posts: 2,251
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

Good expearment. Go for it

Ken
flyingagin is offline  
Reply With Quote
Old 01-02-2013, 06:18 PM
  #412
john josey
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 977
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

LOL Exellent Robert !  That clinches it !
john josey is offline  
Reply With Quote
Old 01-02-2013, 06:33 PM
  #413
acerc
Thread Starter
 
acerc's Avatar
 
Join Date: Sep 2006
Location: The Sunshine state, when it's not raining!
Posts: 8,108
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

John you refered to yours as a TC. Who is that?
acerc is offline  
Reply With Quote
Old 01-02-2013, 06:35 PM
  #414
flyingagin
 
flyingagin's Avatar
 
Join Date: Feb 2009
Location: Modesto, Ca
Posts: 2,251
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

My asking aboutcompressive load at the center back in post 395may have cuased some doubt about the cabanes. I really did not mean to do that and I want to apologize to you personallyacercand any others on this thread that took it that way.

Ken
flyingagin is offline  
Reply With Quote
Old 01-02-2013, 06:44 PM
  #415
acerc
Thread Starter
 
acerc's Avatar
 
Join Date: Sep 2006
Location: The Sunshine state, when it's not raining!
Posts: 8,108
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

No apology neccessary, Ken. It was a perfectly logical question. It's just my anal head could not let go with just my simple belief that it was good. I think that test show's it will be plenty strong.

Think of it like this, if it was weak you would have saved a plane.
acerc is offline  
Reply With Quote
Old 01-02-2013, 07:08 PM
  #416
flyingagin
 
flyingagin's Avatar
 
Join Date: Feb 2009
Location: Modesto, Ca
Posts: 2,251
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s


Quote:
ORIGINAL: acerc

Think of it like this, if it was weak you would have saved a plane.
Ahhh now I did not think of that. Good thought

Ken

flyingagin is offline  
Reply With Quote
Old 01-02-2013, 07:15 PM
  #417
john josey
 
Join Date: Jan 2010
Location: glasgow, UNITED KINGDOM
Posts: 977
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

Robert, TC....Toni Clark in germany the manufacturer of my own pitts kit. I would think the outline on both will be identical, it's just the construction method thats different.
john josey is offline  
Reply With Quote
Old 01-02-2013, 07:22 PM
  #418
acerc
Thread Starter
 
acerc's Avatar
 
Join Date: Sep 2006
Location: The Sunshine state, when it's not raining!
Posts: 8,108
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

DUH! I know that one. Thought about getting one. Even emailed him on total price shipped. But my love of the build overcame the idea of a kit. Although the kit would have been much cheaper.
acerc is offline  
Reply With Quote
Old 01-03-2013, 05:44 AM
  #419
RickBoyer
 
Join Date: Mar 2002
Location: Fleetwood, PA
Posts: 189
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

Hi Robert,

I still have the machine shop quality aluminum jig that I made for the cabanes and I can fabricate the cabane for you but I would'nt be able to turn it around for you until mid February due to work and travel. If this helps let me know, although it looks like the brass cabane assembly that you have fabricated will do fine.

Let me know if I can help,

Rick Boyer

Top Gun 2004-2012
Pitts Special S-1S (#1)
Ryan STA
Pitts Special S-1S (#2)

RickBoyer is offline  
Reply With Quote
Old 01-03-2013, 07:27 AM
  #420
acerc
Thread Starter
 
acerc's Avatar
 
Join Date: Sep 2006
Location: The Sunshine state, when it's not raining!
Posts: 8,108
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

Thank's for the offer Rick. That is very kind of you. I think I'll be ok with the brass.
acerc is offline  
Reply With Quote
Old 01-03-2013, 07:44 AM
  #421
VincentJ
 
VincentJ's Avatar
 
Join Date: Mar 2011
Location: Peterborough, NH
Posts: 2,973
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

Just want to chime in here and bring up two points. First, it never ceases to amaze me how willing others in this hobby are to help other modelers in need. In a crazy "what can you do for me" worldit's refreshing to see help and concern from others. Second point, nice legs thereRobert.. LOL
VincentJ is online now  
Reply With Quote
Old 01-03-2013, 08:34 AM
  #422
acerc
Thread Starter
 
acerc's Avatar
 
Join Date: Sep 2006
Location: The Sunshine state, when it's not raining!
Posts: 8,108
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

My brother, you need glasses!!
Thanks for the laugh!
acerc is offline  
Reply With Quote
Old 01-03-2013, 08:58 AM
  #423
acerc
Thread Starter
 
acerc's Avatar
 
Join Date: Sep 2006
Location: The Sunshine state, when it's not raining!
Posts: 8,108
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

I was getting set up to start sanding and realised I had not installed shear webs in the top wing. When they are dry sanding will commence.
acerc is offline  
Reply With Quote
Old 01-03-2013, 12:54 PM
  #424
acerc
Thread Starter
 
acerc's Avatar
 
Join Date: Sep 2006
Location: The Sunshine state, when it's not raining!
Posts: 8,108
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

I'm still sanding. Will probably be most of tomorrow finishing up the sanding.
acerc is offline  
Reply With Quote
Old 01-03-2013, 03:01 PM
  #425
acerc
Thread Starter
 
acerc's Avatar
 
Join Date: Sep 2006
Location: The Sunshine state, when it's not raining!
Posts: 8,108
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Andy Sheber Pitts s1s

I quit! For the day. Got a club meeting to get to.
acerc is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 01:36 AM.