I happened upon this kit on erockets site and HAD to have it! I've built the previous (non-deluxe) Rocketarium Jayhawk before, so lets see what's different.

First of all, the boat tail doesn't have to be formed from cardstock. It's 3D printed and has scale surface details.

The decal sheet is far more detailed and more to scale now.

I haven't perused the instructions yet, but it appears there's now an ejection baffle assembly.

The winglets are slot-mounted to the main wings/fins.

Should be fun!

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__________________
Never trust an atom. They make up everything.

4 out of 3 people struggle with math.

Chemically, alcohol IS a solution.

NAR# 94042
SAM# 0078

Fitting the engine mount into the 3D printed boat tail.

I first sand the mounting places of the boat tail with 220 to give it some grip for the epoxy. The 24 MM engine mount that I've assembled is a nice slip-fit into the boat tail and registers beautifully! I've used mid-cure epoxy for the adhesive.

I then add the wood centering ring to the protrusion of the engine mount tube and epoxy it also.

TBC

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__________________
Never trust an atom. They make up everything.

4 out of 3 people struggle with math.

Chemically, alcohol IS a solution.

NAR# 94042
SAM# 0078

Now the baffle assembly.

The perforated baffle disks register into the ID of the JT60 baffle body. I've epoxied those in as well as the shock cord screw eye. Once the baffle assembly is glued into the main BT60 it will probably never again be serviceable so I've cut a length of 100# braided Kevlar and tied it to the screw eve with (2) bowline knots and (1) lark's head knot. The supplied shock cord is the rubber kind, so I've rep[laced it with a 1/4" wide braided elastic fabric cord that's 48" long.

I then epoxy the baffle and shock cord assembly into the main BT60. A 4" length of tube is provided in the kit to push the baffle assembly in the correct distance.

Last step for the night. After marking the BT60 for external features I epoxy the boat tail into the main BT60.

Time for some Scotch! Good night.

TBC

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__________________
Never trust an atom. They make up everything.

4 out of 3 people struggle with math.

Chemically, alcohol IS a solution.

NAR# 94042
SAM# 0078

Jeff,

That kit looks nicely done. I’m looking at the tailcone on a smartphone, but zooming in, it looks pretty smooth, with nice detail. Was any sanding required? A year ago it seemed that most 3D rocket parts needed a fair amount of sanding/filling. The quality of 3D parts is just amazing now.

I bought Rocketarium’s aluminum motor retainers in 18mm and 24 mm when they were introduced several years ago. Excellent fit and finish.

__________________
Lee Reep
NAR 55948

Projects: Semroc Saturn 1B, Ken Foss Designs Mini Satellite Interceptor
In the Paint Shop: Nothing! Too cold!
Launch-Ready: Farside-X, Maxi Honest John, Super Scamp

You’re right. The 3D printed boat tail is pretty smooth. Because of the subtle scale surface details I’m Not going to sand it.

Besides the boat tail, the canards, flare nose cone, and antennas are also 3D printed.

__________________
Never trust an atom. They make up everything.

4 out of 3 people struggle with math.

Chemically, alcohol IS a solution.

NAR# 94042
SAM# 0078

Thanks for responding tonite. Now please go ahead and finish that scotch, and go to bed.

__________________
Lee Reep
NAR 55948

Projects: Semroc Saturn 1B, Ken Foss Designs Mini Satellite Interceptor
In the Paint Shop: Nothing! Too cold!
Launch-Ready: Farside-X, Maxi Honest John, Super Scamp