Howdy everyone. Well, here's that update I promised y'all yesterday...
I reckon the first thing I should do here is recognize again, one of the volunteers that is consistently a huge help to us, whether it's when we're working on the B-29, Testiclese (our engine test cell), or the B-24. His name is Jim Ballard and he's an electrical guru. This guy has come out here countless times to work some of the most unGodly hours, while at the same time, coming up with amazing solutions to some bizarre hurdles that we throw him. Often times, some of my "great ideas" become an electrical nightmare, and Jim has yet to be stumped on how to work it out. He's currently working on an interior lighting setup for the B-24 that I came up with (funny how that works, huh...I come up with an idea and make poor ol' Jim do all of the hard part

). He built up this junction box with all sorts of electrical gadgets in it, all from scratch, and is installing it as we speak. We are quite fortunate to continue to have Jim's support..........
So now back to my waistgunner's door project. When I last updated y'all on it, I believe Scott had just repositioned the gun mount so that the door could now swing into it's open position, as advertised. Now, it was time for me to come up with a latching mechanism for the door. This was difficult for me, as I now had to use my brain. I don't do that often, so I was on unfamiliar territory here.
Right off the bat, I knew that I didn't have anymore latch assemblies like the one that should really be on the door. I used the last one we had when I made the tunnel gun door. Besides, I just wasn't happy with the thought of holding this door in place with a single latch, right in the top. I'd much rather have two pins holding the door up, one on either side. I didn't really feel like designing and fabricating the bellcrank assembly that would work for the idea I had bouncing around in my head (geometry isn't my strong suit), so I went on one of my "missions" to find something laying around that I could use. That's when I found the old linkage assembly that was in the bottom portion of the old entry door that we used to have. I just realized I've already posted a picture of that find for you, so I'll move on.
Okay, the first thing I did in order to get this show on the road was to get a basic location to where I needed the latch assembly. A simple measurement and tick mark on the inner skin was the first step....
With the inner skin removed, I just transferred the mark to the inner portion of the door and started laying parts out......
Using an exsisting rivet hole as a pilot, I just enlarged it to accept a -3 bolt. I also went ahead and added the bushings needed that go between the bolt and the linkage bellcrank. This would allow me to place the linkage assembly in it's appropriate spot, so that all further measurements will be accurate.....
After that, a hole was drilled on each side of the door to allow the linkage to protrude from it. These will be the actual locking portions of this assembly. The action of how this assembly works is sort of shown below......
Since the bellcrank assembly was slightly taller than the waistgunner's door, I had to "adjust" it by trimming some material off. This took a few efforts to get it to where I thought was the correct height, but I didn't want to take too much off in one failed swoop........
The next step in this process was to make a piece of structure to retain the upper end (with the door laying on the table like this) of the bellcrank assembly. I just grabbed the first piece of aluminum angle I found laying around and went after it.......
After cutting the angle to length, I added another, smaller angle to the window frame, so that the long angle could have something to attach to. No rocket science here. I just marked the center line, drilled the appropriate hole, and installed the angle.....
When I put the angle in place, I realized that I still hadn't trimmed enough material off of the bellcrank assembly, and it was too tall. The remedy for this was to just keep on trimming........
Once I finally got everything the correct height, I just placed a tick mark on the angle for the mounting hole, and then drilled it..........
Well crap! It turns out that I had apparently stopped using my brain when I'd decided to use that "first piece of angle" that I found when starting this portion of the project. It was much too narrow and the bellcrank interfered with the angle itself.........
So, I just threw the first piece away and made another piece out of some wider, stronger, bulb angle. This was the right answer..........
Once my head was out of my butt and I got the correct angle made, it was a simple task of attaching it to the door structure and temporarily bolting the linkage assembly in place.......
So far, the plan for this linkage was working out. I just needed a latch to make all of this work now. As mentioned before, I wanted a latch assembly that looked like the ones that came on the airplane, but I was out of them. I tossed around several different ideas, but none of them appealed to me. Sure, I some pretty quick and easy ideas, but they just would've looked terrible. I needed something that was fairly easy to build (since time is obviously an issue), yet look somewhat like it belongs on there. You've heard me say it before..."If it's not original, trick people into thinking it is."
Now, I don't know why it is that I can do this, but sometimes, I can walk by an object that looks nothing like what I'm looking for, and see the end result in it. For example, do y'all see a door latch in this large piece of aluminum channel? I did.............
...So I started hacking away until it started looking like the picture I had in my head. I'll spare you the boring details of each step, all of which have been described before...........
Now, here's where my lack of knowledge in geometry came into play. I mean, I made it work, but it certainly looks like I've done it the most difficult way possible......kind of like the British when they engineered the hydraulic system on a Sea Fury

(I apologize to my British friends, but you must admit there's some truth to it

)..........
The next item on this list of projects was to make an actuating rod to attach the handle to the linkage bellcrank. It just so happens there was the exact length rod I needed on some old engine that was laying around here. No need to let that go to waste, you know.

..........
I wanted a little more range of travel with the linkage, so I drilled another hole in the bellcrank to hook the rod to. This made all of the difference in the world, and now the latch works as planned..............
So, that's where I am for now. I plan on
trying to get this stinkin' door done this week. I obviously still have to attach the latch to the door structure, along with modifying the inner skin to accomodate the latch. But with yesterday's mess from the high winds, us having to move out of another hangar (parts storage), and me feelin' like poop, I just don't have high hopes of being very productive. But we'll see.
Gary