Estes Space Twister #7258 Build

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Back_at_it

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With the weather here below freezing, the progress on my Hawkeye Upscale has stalled at the primer / paint stage so why not start something new. Honestly, this is a rocket I never would have bought as I don't care for it's looks. Estes sent it to me with a pack of motors after a CATO a while back and I never really looked at it until yesterday. It's different and I'm hoping that I grow to like it during / after the build. If not I might give it away at a club launch next spring.

Parts list is pretty standard stuff. BT50, 18" long, Maverick style conical nose cone. Balsa fins, 18mm motor mount etc.

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After reading through the instructions, the tail nozzle is not used in this kit but I decided that I wanted to use it. It's included and will look good so why not. I began by separating the tail from the nose cone then trimmed away the excess plastic. I did this first as I will need the tail section to locate the rear centering ring on the motor mount.

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Next up was a standard motor mount build. For this step, I used the two centering rings and the motor block.

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Upper ring was installed about an 1/16 of an inch down from the end of the tube.

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The motor block was installed using an old Estes yellow motor tube spacer. I have marked this to allow the motor to extend 1/4".

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Next was locating and installing the rear centering ring. I knew I wanted the end of the motor tube to sit flush with the end of the nozzle. The rear ring was slid onto the tube then the tube was pushed down through the nozzle until it bottomed out. Once located, glue was applied to the top side of the ring to keep it in place and left to cure.

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Next up was the fins. Each fin is two pieces. There is a piece that connects to the leading edge and extends to the right. I'm assuming this is designed to make the rocket spin but honestly it looks like it's going to create drag more than anything else. All three fins are built the same with the additional piece to the right of the leading edge. I started by sanding everything with 400 grit. The Balsa is extremely soft on this kit and sands very easily.

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The pieces were tacked together with CA at three points. I will come back with either epoxy or wood glue for the permanent connection.

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Repeated the process for all three fins.

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Had to stop there for the night. I'll do more tonight and be back with an update tomorrow.
 
Picked the build back up with marking the body tube and removing the outer layer where the fins will attach.

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Each fin was then tacked in place using a couple of drops of 5 min. epoxy. I used a drop at the top, middle and bottom of the fins. These fins are large and are not balanced due to extra piece that hangs off the edge. 5 min. epoxy made it much simpler to attach. I will be going back with T88 or BSI 30 Min. for the fillets.

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Continued until all three fins were attached.

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While the fins were curing, I added 4ft of 300# Kevlar to the motor mount.

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Everything was left to cure overnight. More work to come this weekend.
 
I would coat the first few inches of of kelvar with glue to protect the kevlar from ejection charges. Ive seem to many times where ejection charge flame cut through kevlar cord. Usually I "upgrade" my kits that come with this shock cord anchor method to the classic t-bag method. Usually outlasts the rocket, and if it needs replaced, so much easier to do.
 
I would coat the first few inches of of kelvar with glue to protect the kevlar from ejection charges. Ive seem to many times where ejection charge flame cut through kevlar cord. Usually I "upgrade" my kits that come with this shock cord anchor method to the classic t-bag method. Usually outlasts the rocket, and if it needs replaced, so much easier to do.
The first few inches will be protected with heat shrink tubing for protection.
 
With all three fins cured, I inserted the motor mount into the body tube. The spacing was set using the nozzle.

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Next up was external fillets. These were done with T88 epoxy. This first coat was warmed with a heat gun and allowed to soak into the materials. You can see where it wicked under the outer layer and into the fibers.

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The launch lug was attached.

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I'm going to do one more coat of fillets then do a light coating of epoxy on the fins as the balsa in this hit is very soft and flexible.

Should be in primer in a few days.
 
What is your technique for doing this on an already-assembled kit?
I like to mix a few drops of 91% rubbing alcohol with T88 epoxy in a stainless cup. I keep the epoxy warm by sitting the stainless in the hot water.

If it's cold in the shop i'll also warm the fins with a heat gun. The idea is to keep the epoxy super thin so that it soaks into the balsa. After about 5 mins. I'll use a towel and wipe away any excess.

From there I'll sand if needed to knock off any high spots then primer and paint.
 
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Been a crazy week with work and the below freezing temps have kind of slowed what I can get done on either of my projects.

I did get the lug attached but that is as far as I have gotten on this one.

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Sorry for the lack of updates on my build threads. Decided to take a break from rockets for a little while and focus on cleaning out some of the stuff from my other hobbies. With the weather being as cold as it has been, I've not been able to do much painting but I finally got some color on this one.

The main color is Behr Lunar Surface Gray. I just can't bring myself to paint another rocket white right now. There must be 50+ in my collection that are white and I just couldn't do it :) The nose cone and fins are Krylon Foil Green Met. The engine nozzle was done in Krylon Dark Gray Met.

I'm going to be using the stock decals on this one but adding some additional details on the fins to try to break up some of that fin area.

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Finally back to finish this one up. For such a simple rocket, I sure let this build drag on forever :)

Started by cutting some stripes for the outside of the fin edges. Being flat, they looked awkward so I wanted something to break them up a little. Next I added the stock hurricane decals to the fins and was able to get the large name decal to come off the paper without too much difficulty. The stripes that went around the body were another story. They disintegrated the moment you tried to move them off the paper. Interestingly, this happened with both of them but not the other decals.

Quick fix was to cut black and green stripes from vinyl.

Overall I'm happy with the result. It's still an awkward design but it's not as bad as it looks on the face card.

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Afterwards, I connected the shock cord to the nose cone and called this one done. Next up will be finishing my Hawkeye build then it's on to a build of a classic.
 
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