Skip to main content

10 months in under 10 minutes.

I don't feel like going into depth on every little aspect of work I've done over the last 10 months, so I'll hit the highlights and if anyone has questions, feel free to comment and I'll elaborate.

 As the year started the garage was cold. With a propane heater it would get warm enough to work for a few hours, but because 4130 steel is an air-tempered alloy, it needs to be sufficiently warm out for welding. Long story short; I can't weld, so I make parts.

I plugged away making little bits so I can use them when it comes time to build a new assembly. The landing gear legs and spring struts have metal straps to reinforce the bushings in the ends. I knocked these out in a couple days after work. Likewise, the tabs that will become door hinges and the fittings for the tailwheel were cut, drilled, and deburred.

As it warmed up and I got an order of laser-cut parts the aileron control arm and pulley brackets were welded to the torque tube for the control stick.

 I also cut pieces for the rudder pedals again; the last ones were cut to the wrong size. 

Tubing was cut for the spring struts, the ends were notched, heated, crushed, welded, ground to fit bushings, bushings welded in, and the reinforcement strap heated, bent, and welded in over the bushings. The bushings were left long for welding, so they will need to be reamed to size and the ends ground to length before they are done. When I was tidying up I slid the smaller tube into the larger and they sprung apart from the air-pressure of a tight telescopic fit. I was thrilled and took this video. The bounce you see in the video is just from the air trapped in the tubes.

 I had to do a bunch of cutting and fitting to add the gear fittings to the fuselage. It would probably have been easier if I'd accounted for these fittings when I was laying in diagonals for the fuselage. The diagonals added for the door opening interfere with the wing-strut fittings. The lower fuselage diagonal also gets cut away to make way for the forward gear fitting. Looks weird, but it's in the plans. To help align all the landing gear fittings with one another I made up tubing spacers then threaded nuts and all-thread through the fittings. The tubing spacers locate the fittings relative to one another and the nuts let me adjust the distance between fittings along the all-thread.


The longerons and horizontal stabilizer were drilled for the eye-bolts that will mount them. Widening the fuselage changed the relationship of these bolts relative to the stab, so they needed some finessing.

The tubes for the seatback were another thing that needed to be tweaked due to the widened fuselage. There are a pair of diagonals at station 3 (behind the seat) which go from the upper longerons to the center of the fuselage bottom. With the wider fuselage these diagonals interfere with the seat back as drawn. I elected to push the bottom end of the seatback tubes forward slightly to give a just a little air between the tubes and prevent chafing. Picture one is looking from the center of the fuselage out at the left side (The front of the plane is to right side of the picture). Picture two shows the sliver of light between the seat back and the station 3 diagonals.


Towards the end of summer I began welding in the tailwheel fittings, strut fittings, seatbelt lugs, and the center mounting plate for the rudder pedals. I didn't feel great about the original fitting where the tailwheel spring mounts to the tailpost. It's just a flat plate in the plans, so I chose to mimic the way Piper did theirs on the Cub and added some diagonals that tie into the tailpost.


The rudder pedal mounting brackets also got cut, cleaned, and TIG welded.











Comments

Popular posts from this blog

Fittings. How fitting.

  Not much has happened on the Ace this year. The winter was long and spring has been very cold, so I spent a long time waiting for the garage to warm up. Now that there's a little heat down there I've been making some headway on the next step of my wing build: fittings. I copied the parts off the plans into CAD and then printed them onto cardstock to use as patterns when laying fittings out on the steel stock.    First I tackled the brackets that will hold the pulleys for the aileron cables. I have a lot of extra material in case I had to remake these. The next step was to bend up my fittings. There is one fitting that mounts to the forward side of the strut which gets bent to a 90° angle. The fitting which mounts to the aft side of the spar gets bent at about an 85° angle. I forget the exact number, but don't feel like looking it up at the moment. Next I cut out the aileron control horns. My Harbor Freight porta-band chucked into my vice works well for cutting thes

3-D and waiting.

On January 18th I posted my last blog update; both fuselage sides were tack welded. That was seven months ago now. I should update more regularly. Okay, self-flagellation over, let's get to the content! Once both fuselage sides were tack welded, I pulled all the jig blocks off the table, elected not to repaint again, and just laid out the stations for the top view of the fuselage. We lay out the top view because the top of the fuselage is flat which makes it a lot easier to jig things up if you lay out the fuselage upside-down. With the top view lofted out on the table I could start adding in jig blocks starting in the cockpit area where the sides are parallel. A stick and some clamps help hold the sides parallel for this photo op.  Now may be a good time to mention, if I haven't already, that I am widening this fuselage from stock. The original Jr Ace (Model E) was 33-1/8" between tubing centerlines at the widest point. This makes for a pretty cramped space when two peopl