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Will start working on the drawings this week Matt. The only difference between the two boxes, is one a single output and the other is a dual output.
Craig
Matt: Is that the booster box for the cockpit light? Hangs just about the left ear on the back cockpit side frame? If so, there are two versions of it. I’ve got one sitting on my table ready to have drawings done. I can also do a schematic if you want it to be operable.
Craig
Sean: Count me in for one. I’ve got an acquaintance that came up with one of the fittings at the bottom of the mast and has given me the dimensions. It’s a stepped mushroom and is some sort of coated metal. Haven’t worked that out yet.
I finished making sketches this morning of all the components of the antenna reel. I’ve got to get them into CAD and start correcting them and bringing them to standard dimensions and materials. Whom ever executed this one, did so without much accuracy on some things and way too much on others.
For the ceramic cone on the rudder, I was thinking of doing them in a reverse lost wax process…3d print the mold and slip cast the part. I haven’t done any ceramic work sine I was in junior high, so been away from it for a long time.
Re: drag cones…. I have two here on the desk to copy. One is the black rudder/plastic style and the other is an acetate one. They are of different sizes, so I’ll draw up both. Neither has any kind of attachment hardware, so that would need to be sorted out as well. My thinking, is that I’ll come up with a small wire frame and sew up a nylon cone instead, like a tiny wind sock.
Craig
Bob: When you need parts, take the time to shop around a bit. You can often find the parts a lot cheaper elsewhere, but lead times may be a bit longer.
Jim: A thought… as we find these substitutions, maybe we should, as a group, put together a known interchange on part numbers that are no longer available, but have current substitutions.
Worth checking the drawing notes, as a couple of them, and I don’t remember which ones, listed a 10 series Stinson part number as “same as”.
Robert: The 62304 was a custom rod end. It uses an AN201-K4A bearing. That number, as well as it’s updated version, MS27641, are available.
For the RE3M6A, look at the MS21151 specification and check the measurements.
Wag Aero has the RE3H5’s in stock, but hold on to your nitro pills when you look at the price.
https://www.wagaero.com/re3h5-rod-end-bearing.html
Craig
Sam: Thanks for the info on your tail piece. Most of the mastheads on faster birds have been ceramic, so this was a little surprising. After years of searching, I did find the answer on how the radio connects to the long wire. There is a mushroom shaped fitting at the base of the mast that is steel of some sort, that the antenna lead from the radio, is jumpered to. The antenna wire simply passes thru this fitting, giving a surface contact and allowing the RF to pass to the wire. An acquaintance of mine that restores lots of old military radio gear, happened to post a photo of his RCA long wire system and there was that fitting. I’ve got the dimensions, so just need to draw it up and send him a copy for checking.
I’ve got a pretty good idea on how to slip mold the tail insulators, but need to get my hands on one for a bit and to create a pattern. Lanny has one over at the hangar, and I should be able to pull a pattern off if it.
Working on the antenna reel drawings right now, and correcting some hardware errors from the pattern unit that I am using. Drag cone drawings are next after that.
The IN-83 insulators for the antenna wire between the radio and the mast, have become very hard to find in any quantity. I think I’ve located a source for a current production bead that is extremely close in all dimensions and even color. I’ll probably drop them an order, as soon as I can verify the dimensions from the package of IN-83’s that I do have. I need about 600 for another aircraft project that takes the same ones. A package of 1000 pieces is relatively inexpensive, so we shall see.
Hi Jim: Kinda unusual that the head is metal rather than ceramic. I know someone that has one, probably from Jason. I’ll see about borrowing it and making a cast pattern off of it. I’m not up on casting stainless, but using a 4 axis mill could replicate them reasonably quick. Will have to cogitate on it a bit.
Craig
Something else to remember, is that there is a minimum of about 65 pounds of weight that would have been removed when the a/c was licensed civil. The radio in the front cockpit, mooring kit, engine cover kit, tool kit, most likye the fire extinguisher too. B’s and on would have lost even more weight when the SCR-274 radio package was removed and the camera stuff on C’s and on.
Bill: P/N on the clips should be 76-64069-x. This drawing replaced the 76-31492, 31545 and 31505 when the G model was designed. The 64069 drawing also states that they are the same as the 77-64121-x drawings. Material list shows them to be 2024T0.
I’ll pull the power supply out this weekend and shoot some photos. Probably be a couple of weeks at least before I can do a correct set of drawings. I’m trying to get the antenna reel stuff done now, but having to switch software, so it’s slower than molasses at the South Pole….. The unit I’m copying has some incorrect parts, so I am trying to correct that as I go. I finally found out how the transmitter output is fed to the antenna wire and that part is a bit complicated to figure out, as I only have photos of it. I need to find a ceramic masthead and a guide cone for the rudder to make molds off of at some point.
Craig
