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#1 SemRoc Estes Midget

Posted: Sun, 14 May 17, 16:22 pm
by Commander
Started building the Midget this past week. This one is a Carl's Semroc version. No pictures yet.

#2 Re: SemRoc Estes Midget

Posted: Sun, 11 Jun 17, 20:16 pm
by Commander
Haven't had much time to work on this, even though I meant it as a quickie build and launch. :cry: Better days are coming though :) and I have been able to at least take a couple of pics :)
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The balsa filler coat has been brushed on and I started sanding the sustainer's fins. If only Cortana would take dictation, I could write posts while sanding. :ugeek:

#3 Re: SemRoc Estes Midget

Posted: Tue, 13 Jun 17, 04:41 am
by Trident
A neat little classic! Why is it I am so drawn to some of the simple little rockets from a 1/2 century ago? Well, for one, I guess it's because I could afford the simple little ones a 1/2 century ago! I could never afford a big Saturn, or a Mars Lander.

I was also a huge fan of stagers. My first was the Apogee II.

Looking forward to seeing this one completed, so let's get moving on this!

#4 Re: SemRoc Estes Midget

Posted: Sun, 18 Jun 17, 04:28 am
by Commander
I would like to say it surprises me when I put the first primer coat on a rocket to see all the blemishes and imperfections, but it really doesn't after all these years.

Fill and primer sprayed, pics in the morning or sometime soon.

#5 Re: SemRoc Estes Midget

Posted: Wed, 28 Jun 17, 05:56 am
by Trident
Secret I learned from a John Boren (head of Estes R&D). A bunch of us hung out drinking beers and talking rockets one evening at NSL last month. Pried as much as we could out of John. :D
Use a good filler-primer, load the rocket with several heavy coats. (John doesn't even use sanding sealer on fins and nose cone.) Wet sand using a sanding sponge from Harbor Freight. They are cheap, $5.99 for 6. Repeat if seams aren't filled, or if grain shows. I did this routine twice, and everything was incredibly smooth. I had already used Sanding Sealer on fins, and may continue to do so. But John's rockets were flawless, so the technique works.

Note: I found the sponges to be a little thick. I ran them upright thru my bandsaw to make them thinner and more flexible.

#6 Re: SemRoc Estes Midget

Posted: Sun, 02 Jul 17, 05:06 am
by Commander
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I don't generally fill the spirals anymore, by the time I have gotten to the finish coats they are already filled, so in a way in that regard I am following in John B.'s footsteps. With balsa nose cones I have my procedure down, three dunks into the pint size can of Brodak Sanding Sealer. After sanding a coat or two of primer and it's set. I have yet to really find a method for balsa fins that I like. The Elmer's Wood filler technique just seems like too much trouble, if done correctly.

Anyways, that's not quite what I was concerned about on this build. Because I was trying to push a quickie build, I neglected to coat the reducer cone with CNA to stiffen it. This has caused sections of the cone to pull away and create a gap at the joint with the body tube as the cone flexes under handling.
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#7 Re: SemRoc Estes Midget

Posted: Mon, 10 Jul 17, 03:19 am
by Trident
Bernie,

Try brushing some thin CA onto the paper cone, right on top of the primer. I often drip thin CA where I want it, and use a Q-tip to spread it around. It should help to toughen the paper. If needed, you could even apply some Bondo Spot Putty or Squadron Putty over the sanded CA if there are any indentations. I've used CA a lot to toughen paper on a rocket, then filled any imperfections. All it takes is lots of patience!

#8 Re: SemRoc Estes Midget

Posted: Mon, 10 Jul 17, 03:27 am
by Commander
I actually ended up using some bondo glazing & pot putty. Here are some pictures from tonight, I gave it a coat of Krylon silver. Boy do the defects start popping out (although they are not readily visible in the pictures).
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#9 Re: SemRoc Estes Midget

Posted: Sat, 15 Jul 17, 05:09 am
by luke strawwalker
Commander wrote:I actually ended up using some bondo glazing & pot putty. Here are some pictures from tonight, I gave it a coat of Krylon silver. Boy do the defects start popping out (although they are not readily visible in the pictures).

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POT putty?? That stuff imported from northern California, Washington state, or Colorado?? LOL:)

I prefer SPOT putty myself... LOL:)

Later! OL J R :) :lol:

#10 Re: SemRoc Estes Midget

Posted: Sat, 15 Jul 17, 22:47 pm
by Commander
luke strawwalker wrote:
Commander wrote:I actually ended up using some bondo glazing & pot putty. Here are some pictures from tonight, I gave it a coat of Krylon silver. Boy do the defects start popping out (although they are not readily visible in the pictures).

P7090005.JPGP7090002.JPG
POT putty?? That stuff imported from northern California, Washington state, or Colorado?? LOL:)

I prefer SPOT putty myself... LOL:)

Later! OL J R :) :lol:
You use what you want, and I'll stick with what makes me happy ;) Thing is I always seem to get the munchies when I'm working on my rockets.