Stewart 51 Partner LLC

2018 News and Events

January February
Above, Elliot Seguin in Rod Bower's beautiful S51.  Check out Elliot Seguin's Facebook page, Wasabi Air Racing for updates on Elliot's test flights.  They have made four flights now (February 25th).  Elliot's film production of the fourth flight is excellent, with a glimpse into test flight data generation.
Leading Edge and Rib Production:

We are ever closer to testing our leading edge production concept.  Last week, Chuck and I were in Chuck's facility, TPR, Inc., evaluating the first prototype blanks he had water-jetted.  Chuck has one more refinement to test on the process, mostly about minimizing "overspray" from the solid media working up under the protective plastic film on the aluminum.
Rod Dill and I spent a morning last week double checking ribs for correct fit and design, and found several more details that we need to correct before going to quantity production.  Below, you'll see how things are beginning to look with new ribs clamped into position on a long range fuel spar.  This long range spar is slightly different in a couple of ways from the standard spar we'll be building, and is a pain in the tail to work with, but will have to do for now.

Above, Doll's Engine prepped for Dyno Run.
The photo above (sorry about the glare) shows the coolant line Al added to get more flow from the engine to the thermostat box.  Before, we only had holes inside the box to allow coolant past the thermostas to tell them what was going on in the engine.  Those holes proved to be inadequate.  This added line should give us the flow, therefore the information to the thermostats, that we have to have to properly regulate our engine temperature.
Trey and Al with the engine loaded.

Cliff Fitch sent this picture of the Main Landing Gear components he has manufactured for us.  Cliff plans to bring them down to Montgomery in the next month or so.  He is also finishing up on manufacture of throttle quadrants.  When Cliff gets to Montgomery, we'll finalize plans for the remaining landing gear parts and tail wheel parts.  Below, a shot of one of the downlock assemblies Cliff is also manufacturing.
Jim Czachorowski has taken on the job of Moderator of the Stewart 51 Builders Group on Yahoo.  Owen Smith created the site and served us all as Moderator since the site's inception.  Many thanks from all builders for the work Owen performed in keeping the site going as long as he did.  The site is for Stewart 51 builders only, and has been a valuable source of builder to builder communication.

That said, the site has become somewhat cumbersome and obsolete for us, given limitations on photo uploading and getting people approved and on the site.  Jim Czachorowski ("Czach" or "Zack") has done some study and, taking a page from Test Pilot / Race Pilot Eliot Seguin, has formed a Facebook page for our Builders Group.  Czach is still working out the details of how to keep it secure for Builders while, at the same time, allowing genuinely interested followers to see some content.  We look forward to this new tool in S51 communication.

Below, you'll see the left wing aileron idler arm on our kit under construction in Bartow, and below that a photo of the leading edge of the left flap. 
Jim Stewart's blueprint and Owen Smith's Builder's Manual point out that the aft spine on the idler needs to be relieved to clear the flap.  We missed it on our kit.

We were alerted to look at this issue by Rod Bower and Elliot Seguin.  Recall that on the first couple of flights, Elliot reported some friction in the ailerons.  The two photos below show what they found.  Also notice that Rod's idler has been relieved per instructions, but still made contact with the flap.  Jim Czachorowski has done a finite element analysis on the part and has determined further relief will not weaken the part in the directions it needs strength, so one option for Rod is to remove more material to clear the flap.  The other method that will work is to notch the leading edge of the flap to clear the idler.  The leading edge is already relieved in other areas to clear hinge brackets and actuator arms.
I should get a start this week  on re-installing the engine in Doll.  We should also be close to our leading edge skin production method proof.  We'll keep you posted.

April, May News and Events

In the sling, then in the cradle.  Finally.  Now for some hooking up.

Below, you can see a little detail that slipped past us:  To make room for the Main Landing Gear in the wheel wells, the inner four ribs had to be "lengthened" from the main spar forward.  We did this with the tooling we built for those ribs.  What we missed in the instructions from Jim was that we also had to make them deeper toward the front to allow for the gear.  Looking back at the original tooling, we saw where they had made the same mistake, and had added metal, then reshaped.  We are in the middle of that process now on the four inside ribs on each side.
Below, shots of the Main Landing Gear components and Throttle Quadrants from Cliff Fitch.  Cliff and his son, Cliff III, drove them down to Montgomery and took stock of other parts we need to build.  Cliff and Cliff are doing excellent work on these parts.  You should see Cliff III modeling these parts and changing views and making them move and interact with one another on his computer.  Amazing talent and experience in these two men.  We are lucky to have them involved.
Rod Bower and Elliot Seguin are still flying Rod's time and researching his flight characteristics on his S51 out in California.  Elliot continues to post excellent YouTube videos of his flights and data.  Find them on his website Wasabi  Racing or YouTube.

Jim Gohm is flying in Arizona.  Good reports from Jim.

We'll update again soon.