More progress has been made on the SA-1 model. The final detail bits have been added. After going through more photos of the SA-1 vehicle, I noticed that the fuel tank on quadrant 1 does not have the same valve detail as on the other tanks. Instead of a recessed valve there is a raised detail where the on pad fuel fill and drain line attaches. I made this part with a stack of styrene strips with each strip getting smaller as they go up. This helped in shaping the part since it has tapers on both ends. The top appears to have a round shape so I sanded that in. The part then got attached over the original tank valve recess.
Next I moved on to the air scoops on the outboard engine fairings. I’ve been thinking of how I would model these parts since I began the build. I finally came up with an acceptable solution. I pulled out the Walthers piping sprue that I used earlier to create the turbo pump exhausts. I looked carefully at the ends of the runners that lead to some of the parts on the sprue. Some of the ends had a rounded profile and were close to the right diameter. I used a sharp #11 blade and cut off the hemispherical ends of the runners and then cut those in half. This left me with some 1/4 sphere shapes that were close the size needed. I then glued them in place on the fairings and used the #11 blade to shape them to more closely match the correct profile. They may still be slightly oversized but they look close, so I’m going to leave them at that.
Next I noticed that there were vent openings at the top of some of the fuel and LOX tanks. Not all of them just some of them. I found some drawings online that showed the plumbing of those vents. The drawing along with some photos allowed me to determine which tanks had the vent holes. I used a small drill bit in my pin vice and made the vents.
I then primed the upper dummy stages and the first stage. I’m sure it won’t be the last time I prime these parts. It seem that every time I think I’m done, I find some more pin holes that need to be filled. I also attached the engines and turbo pump exhausts to a paint stir stick and primed them as well.
The next thing will be to glue the upper stages to the first stage. Some more sanding and filling will be required at the join. But that is for next time. Thanks for looking.
I’ve had other things going on, so it has taken me longer than I planned to get back to the build. But I now have made some progress. First I trimmed the outboard engine fairings. They have an angled edge rather than straight. The angle needs to somewhat match the subtle angle on the boat tail. The next thing to do was to complete the turbo pump exhausts. I cut out some brackets from 0.010 styrene sheet and attached them to the pipes.
I then drilled some small holes in the first stage boattail to accept the exhaust pipes. I’ll attach them later in the build. I also drilled holes at the base of the fuel and LOX tanks to match photos of SA-1.
Finally, for this post are a couple of pictures of the continuing filling and sanding of the model to cover some of the blemishes in the castings. You can also see that I’ve added some tunnel covers to the fuel tanks and a vent pipe on the fuel tank of Position 4.
I finally made some new progress on the SA-1 model. I glued the top section of the first stage in place. I then also glued the second and third stages plus the nose cone together. The first stage needs more clean up and filling. I started where the tanks meet the boat tail. I thought about using my Dremel to get rid of some of the junk in between the tanks on the first stage, but it is such a confined area that I’m afraid that I’ll mess up the tanks on either side. I think I’ll be adding filler between the tanks to cover up the lumps an bumps there. The dummy upper stage assembly also requires some filling and sanding.
While waiting for some filler to dry I started scribing the panel lines into the base of the boat tail. I also drilled some holes to insert locator pins for the engine bells to be added later. Next I drilled a hole in the base of each engine bell. I also glued some 3/64 inch styrene rod into each of the locator holes in the boat tail.
The outboard engine fairings that come in the kit are too small and do not fit well on the boat tail. I instead used some 0.010 inch sheet styrene to make some replacements. I glued them on with Plasti-Zap CA glue. Since each curve on the boat tail is a bit different on this kit I numbered the edges of each fairing so I could get them in the right place. Plus I continue to add filler to the tanks on the first stage.
I also started making the inboard engine turbopump exhaust ports. I’m not that great at bending styrene rod, so when I can, I adapt other parts. I had some piping left from a Walthers Piping kit that I used on a steampunk rocket a while back. I pulled out the runners to see if there were some parts there that I could use as a turbopump exhaust. Sure enough I found some. I only had four pieces that I could use, so I had to make sure not to mess them up. After cutting them from the runner I carefully trimmed off the ends that I didn’t need. I then drilled out the ends that will be seen so they look more like pipes instead of rods.
That’s it for now. I have to make some brackets for the turbopump exhausts before they can be attached. I also have some more detail items that need to go on the first stage tanks, but first I have to finish the filling and sanding.