Woodstock Glider

Hi. Did you ever follow through with the wing rib patterns or templates. I'm looking to start a build this summer. Any time savings on templates would be greatly appreciated and worth a financial fee to me. Turns out my plans are a copy from years ago so I dont really trust their accuracy. Either way, thanks for your time. Mark

On Thursday, May 10, 2018 at 8:36:39 PM UTC-4, wrote:
I'm looking to start a build this summer. Any time savings on templates would be greatly appreciated and worth a financial fee to me.

Something to think about. People who're building boats out of marine plywood often have their plywood cut out by laser. You can get your Woodstock paper pattern for ribs professionally scanned, then send the file to a job shop to be cut out. This is quite common for boat builders who're building from both traditional and new designs. It is cost effective because of the time savings and precision. The laser cutter can insure that the ribs for the left and right wings are identical, and symmetry is important.

Google for 'custom laser cutting plywood'. You can send your file to multiple shops for competitive bid.

On Thursday, May 10, 2018 at 7:16:17 PM UTC-7, son_of_flubber wrote:
symmetry is important.

Balance is important. Symmetry is way overrated, and I have the check templates to prove it.

--Bob K.

On Thursday, May 10, 2018 at 11:35:16 PM UTC-4, Bob Kuykendall wrote:
On Thursday, May 10, 2018 at 7:16:17 PM UTC-7, son_of_flubber wrote:
symmetry is important.

Balance is important. Symmetry is way overrated, and I have the check templates to prove it.

--Bob K.

If I might suggest, have them cut on a CNC machine, not burned on a laser cutting machine. Adhesives don't stick well to charred wood. I have a set of Wood stock parts, even completed spares that I cut by hand on a bandsaw, maybe 30 years ago...other ships got in the way and I never got around to assembly...plans are sometimes procrastinated by life. However it is a very straight forward process, tack the drawing to a piece of HARD masonite. Cut to almost the line then sand to the line. Tack two sheets of the 1/4 inch Marine ply together and trace the master pattern onto the stacked plywood. Rough cut (within an 1/4 or a 1/2 with a hand jigsaw)then cut and sand to the line. Trim the master pattern to the next rib and do the same for all the ribs. You can make a second set of master patterns by making a second master pattern with the sacrificial pattern each time. Please feel free to contact me should you like.
Jeff

On Thursday, May 10, 2018 at 11:35:16 PM UTC-4, Bob Kuykendall wrote:
On Thursday, May 10, 2018 at 7:16:17 PM UTC-7, son_of_flubber wrote:
symmetry is important.

Balance is important. Symmetry is way overrated, and I have the check templates to prove it.

--Bob K.

Please say a little more about how this works. I was thinking that precision and symmetry affects the left right balance in an aircraft.

Guys, we're talking about a wooden glider that is covered with plywood and fabric. Space age technology is not required. Your precision cut ribs will be cut in half, then glued to the spar........I'd be more concerned about maintaining a true cord line in the vertical assembly process. Jim's instructions were to glue the master rib sheet to 1/8 birch, then nail two blank rib pieces of 1/4 plywood, then cut to within 1/16 with a band saw, followed by disc sanding down to final size. Then nail two more blanks to the master and repeat the process. After all ribs have been glued to the spar, I like to level everything with a 36" sanding board running it fore and aft as I slowly move down the wing.
Hope this helps,
JJ

On Thursday, May 10, 2018 at 9:33:49 PM UTC-7, son_of_flubber wrote:

Please say a little more about how this works. I was thinking that precision and symmetry affects the left right balance in an aircraft.

The gist of it is in Eric Stewart's article in the March 2018 issue of Soaring.

--Bob K.