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  #1  
Old 11-17-2019, 04:06 PM
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Default Build thread: Estes SA-2061 Sasha #7271

While "The Vixen" wet-sands the 3D printed parts of the Boyce Aerospace Nike Ajax and shoots me dirty looks (go figure,) I'll build this brand new, 2-stage, scale-like beauty: the Estes #7271 SA-2061 Sasha.

I've slit the kit bag open and everything looks good. Tubes are nice. There's a slotted BT-60 booster tube. Decals are nice. There's (3) balsa sheets.

I first assemble the (2) engine mounts. These will get epoxy for adhesive and the sustainer's 24mm mount gets a Kevlar shock cord leader. TBC
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Old 11-17-2019, 05:09 PM
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Now to prep the fins.

I first lay the Corian board covered with 220 across my herculean thighs, and while "The Vixen" feeds me grapes I scrape the leading edges of the (12) fins round.

Four down--eight to go. TBC
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Old 11-17-2019, 07:41 PM
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I've epoxied the engine mount into the booster and slot-mounted the (4) fins to the booster section. TBC
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Old 11-23-2019, 10:08 PM
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I think I'll jump ahead in the instructions and attach the raceways before the fins instead of afterward.

Now for some technique: to scrape a concave detail into the mounting surface of each raceway I first cover a scrap piece of BT60 with 220 grit sandpaper. I then rub some Elmer's glue stick onto the fingertips of my right hand. This allows the raceway to stick to my fingers as I scrape the concave detail into it.

I then glue the (4) raceways onto the sustainer with Titebond red.

TBC
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Old 11-23-2019, 10:18 PM
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The following is WHY I'm mounting the raceways before the fins.

After the glue is dry on the raceways I then surround each raceway with Scotch Blue Delicate Surface painter's tape. The tape will protect the sustainer's BT60 as I sand and scrape the final profile of each raceway using the mahogany block initially and then by hand.
After I'm satisfied with the profiles I then give each raceway (4) coats of sanding sealer. After the sealer is dried and sanded I finally remove the surrounding tape.

TBC
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Old 11-23-2019, 10:21 PM
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Now for the sustainer's fins. The (8) fins are now mounted to the sustainer. I've also mounted the (2) launch lugs onto the sustainer and I ensure the lugs and the fins line up with the lug and fins of the booster. I'll fillet them tomorrow.

Time for a drink. Good night.

TBC
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