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Sheber Pitts S1S build - 9/6/2012 9:30 PM   
SplinteredProp


 

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From: Cave Creek, AZ, USA
Status: offline 		 Greetings,

New to the board, and would like to document this build here.  If anyone is interested, they are welcome to follow along.

I just got my hands on a set of Andy Sheber 1/3 Pitts S1S plans, so the build is in it's infancy.

So far, I've only made a copy of the plans, cut up the copy to useable sizes, and have made a material list.

This will not be a fast build, since weekends are the only time I can dedicate to building.

Since it is my intention to post a pic with every post (except if answering a question), I will start off with a pic of the plans.




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RE: Sheber Pitts S1S build - 9/6/2012 9:50 PM   
john josey


 

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From: glasgow, UNITED KINGDOM
Status: offline 		Hi There,

I built a 1/3 s1s from the toni clark kit a couple of years ago so i'm definatly interested in your build !

                   cheers
                          john

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RE: Sheber Pitts S1S build - 9/7/2012 3:40 AM   
smithcreek



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Status: offline 		Looking forward to this.

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RE: Sheber Pitts S1S build - 9/9/2012 3:19 PM   
SplinteredProp


 

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Status: offline 		This plan requires various elements to be laminated to curved shapes, the most complex being the horiz stab/elevator (hs/e).

Since I've never attempted this method of construction before, this seemed like the logical place to start.

Pic 1: The plan.

Pic 2:  I traced  the inside line of the perimeter of the hs/e, cut out the pattern, and glued it to doubled up pieces of MDF, which   I screwed together.



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RE: Sheber Pitts S1S build - 9/9/2012 3:21 PM   
SplinteredProp


 

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Pic 1: The pattern/template after being cut with a band saw and final shaped with a bench belt/disc sander.

Pic 2: I drilled 1" dia holes through the template while they were still screwed together - these will provide places for clamping. I then seperated the 2 template halves, placed packaging tape around the perimeter and screwed then to my workbench.

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RE: Sheber Pitts S1S build - 9/9/2012 3:28 PM   
SplinteredProp


 

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Status: offline 		I needed a few balsa strips, so I fashioned a bench mounted balsa stripper.

The plan calls for a final thickness of 5/16, but I cut these to 7/16 to allow me to sand out imperfections and uneven strips.

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RE: Sheber Pitts S1S build - 9/9/2012 3:38 PM   
SplinteredProp


 

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Status: offline 		I soaked the balsa strips for about an hour, then placed them, without glue, around the template.  I wanted to pre-shape the laminate strips before gluing.  I thought this would make the gluing process easier.  That also explains the lack of wax paper under the template in the first pic.

After the laminate pieces dried, I removed them from the template, placed wax paper under the template, and began gluing the layers together.

I glued a single layer at a time, allowing approx 30 minutes between layers, for a total of 6 layers, and let dry overnight.

The finished piece ended up being between 13/32 and 7/16 thick, allowing me enough material to sand to a finished 3/8 width.

Overall, I'm pleased with the finished result, considering I have never attempted this construction method before.

That's it for this weekend - Today is going to be spent watching football.



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RE: Sheber Pitts S1S build - 9/16/2012 12:50 AM   
SplinteredProp


 

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Status: offline 		OK, back to the shop...

The first thing I did was to cut the HStab TE & Elev LE to the correct size, mark the hinge locations, add 5/16x3/8 backing to the hinge locations, drill them both at the same time on the drill press.  I then inserted dowels in 4 of the 8 hinge holes to keep everything aligned. (Pic 1)

My shop helper (Pic 2)


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RE: Sheber Pitts S1S build - 9/16/2012 3:34 AM   
acerc



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Status: offline 		I have the plans, cowl, pants, and canopy. Plan to start after the first of the year. So I am subscribed and learnin.


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RE: Sheber Pitts S1S build - 9/16/2012 2:08 PM   
SplinteredProp


 

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Status: offline 		I didn't like how little material there was for the hinges to grab onto in the elevator, so I added more balsa. (Pic 1)

The almost finished stab/elev (pic 2)

 

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RE: Sheber Pitts S1S build - 9/16/2012 2:10 PM   
SplinteredProp


 

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Status: offline 		Rather than use block balsa in areas that require addidtional strength, I made 3-ply balsa pywood...

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RE: Sheber Pitts S1S build - 9/23/2012 3:12 PM   
SplinteredProp


 

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Status: offline 		I cut the H stab/elev gussets out of 1/8" plywood on the scroll saw & sanded to fit (pic 1)

The finished H stab/elev (pic 2)



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RE: Sheber Pitts S1S build - 9/23/2012 3:22 PM   
SplinteredProp


 

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Status: offline 		I dislike sanding the edges of control surfaces since I feel as though I have little control - especially on this H stab/elev with everything being curved.

So I figured a shaping tool of some kind was needed and made on out of a piece of 1/2" PVC & some self-adhesive sandpaper.



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RE: Sheber Pitts S1S build - 9/23/2012 3:23 PM   
SplinteredProp


 

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Status: offline 		The finished result after using the PVC sander & finishing with some 220 grit.

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RE: Sheber Pitts S1S build - 9/23/2012 3:26 PM   
SplinteredProp


 

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Status: offline 		I then cut the elevator away from the H stab, and rounded the elev LE the same way I did the other edges.

I want to minimize the gap between the elevator & H stab, so in order to do that, I needed to make the TE of the H stab concave.

Another tool was needed, and this time a pencil & piece of sticky sandpaper was used.

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RE: Sheber Pitts S1S build - 9/23/2012 3:27 PM   
SplinteredProp


 

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From: Cave Creek, AZ, USA
Status: offline 		The finished result.

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RE: Sheber Pitts S1S build - 9/23/2012 3:33 PM   
SplinteredProp


 

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Status: offline 		I would love to hinge this thing before covering, but I am unsure how I would do that....any tips would be greatly appreciated...

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RE: Sheber Pitts S1S build - 10/9/2012 7:51 PM   
acerc



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Status: offline 		http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXES25&P=7   Might be helpfull


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RE: Sheber Pitts S1S build - 10/11/2012 3:49 PM   
SplinteredProp


 

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Status: offline 		Well, after a shop disaster which resulted in the destruction of the stab & elevator, I had to start from scratch & rebuild.

I took this opportunity to make some changes to the stab/elev.  In my opinion they are improvements - things that I thought of after building the first stab/elev.

Pic 1 shows the new stab/elev.

Pic 2 shows 1/16" plywood inlays at the points where the flying wires will be attached.  These should make a more stable area of attachement.

Pic 3 shows how I reinforced the leading edge of the stab with plywood gussets.  I figured this couldn't hurt since this is one of the areas where the airplane is held during engine run-ups.

I also doubled up the balsa on the trailing edge of the stab & leading edge of the elevators to provide strength & a better gluing rea for the hinges.


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RE: Sheber Pitts S1S build - 10/14/2012 3:28 AM   
R/C Art


 

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quote:

ORIGINAL: acerc

I have the plans, cowl, pants, and canopy. Plan to start after the first of the year. So I am subscribed and learnin.


I also have the same items but don't know when I will ever get to the actual build. I am subscribed, too.

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RE: Sheber Pitts S1S build - 10/14/2012 2:21 PM   
acerc



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SP did you give the above link a look in regard's to the hinging?


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RE: Sheber Pitts S1S build - 10/14/2012 2:50 PM   
R/C Art


 

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quote:

ORIGINAL: SplinteredProp

Pic 1: The pattern/template after being cut with a band saw and final shaped with a bench belt/disc sander.

Pic 2: I drilled 1'' dia holes through the template while they were still screwed together - these will provide places for clamping. I then seperated the 2 template halves, placed packaging tape around the perimeter and screwed then to my workbench.


I have laminated outlines on several projects over the years but never thought about drilling holes around the perimeter and using clamps. Sheer GENIUS! I will use this technique in the future for sure. (I have sent you a PM)

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RE: Sheber Pitts S1S build - 10/15/2012 11:12 AM   
SplinteredProp


 

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quote:

ORIGINAL: acerc

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXES25&P=7

SP did you give the above link a look in regard's to the hinging?



Yes I did, thanks for the link.   The hinge pockets are worth considering, but I'm not sure I'm going to go that route.



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RE: Sheber Pitts S1S build - 10/15/2012 11:14 AM   
SplinteredProp


 

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From: Cave Creek, AZ, USA
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quote:

ORIGINAL: R/C Art

I have laminated outlines on several projects over the years but never thought about drilling holes around the perimeter and using clamps. Sheer GENIUS! I will use this technique in the future for sure. (I have sent you a PM)


I can't take credit for being a genius.  I've seen that method on this site and copied it.  But it is a forehead-slapping type of an idea...


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RE: Sheber Pitts S1S build - 10/15/2012 3:38 PM   
SplinteredProp


 

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Status: offline 		Well, didn't get too much done this weekend, as I chose to spend a lot of time flying instead

I did work on the upper wing ribs, and in studying the plans, I really didn't like the spar arrangement as shown.  In Pic 1, you can see where the main spars (1) are shown as 1/4" x 1/4" balsa, and not located at the thickest part of the rib.

I chose to add  3/8" x 1/4" basswood main spars as shown on my rib template in Pic 2 (1).  A also decided to use 2 1/4" x 1/4" TE spars in lieu of the 1/4" x 1/2" spar drawn on the detail (2).  I wasn't confident that I could cut accurate rectangular holes in the ribs.  

I spray-glued the modified detail onto 1/8" plywood, and cut on the bandsaw.  I then glued sandpaper onto the backside of the template to prevent it from moving while cutting the ribs.


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