I gave a brief preview in a recent post, but I’m excited to report that the L3 Fusion rocket is now finished. This is a kit available for pre-order from Scott Binder at SBR, and I was fortunate enough to partner with Scott to do a test build on his latest design.
As mentioned a while back, the L3 Fusion is a larger, upscaled version of his classic Fusion rocket. It has a 5.5″ diameter airframe and is about 90 inches in length, with a 75mm motor mount tube capable of flying on an M motor. What’s particularly great about this rocket is that it combines strength with being lightweight. Its cardboard airframe weighs in at just 11 lbs when fully loaded, minus the motor.
And yet it’s fully double-tubed from top to bottom, and the entire interior is coated with West System epoxy to harden and strengthen it. This thing can take a beating, and it is more than strong enough to handle an M motor.
I plan to fly it for L3 certification on an Aerotech M-1297 motor. Believe it or not, this will be my first time using a reloadable (RMS) motor, and my first time putting one together. I’ve previously just used disposable (DMS) motors since they’re so easy to handle – minimal preparation, and then discard entirely after the single use. But having now built the M-1297 in preparing to fly, I have to admit there’s something satisfying about putting together the motor yourself. Of course, it’s a bit messy and you’ll get your hands dirty – and the casing is not cheap – but the end product speaks for itself.
In addition to building the rocket, we also set up a small studio and filmed the entire project, from start to finish. Throughout the process, I try to explain what I’m doing, though I’m far from an expert (I am, after all, just applying for my L3 certification). It was a lot to film, and as you can imagine, the video editing process is extremely time-consuming (props to Scott for undertaking this). But it should make for a great tutorial on YouTube, and I’ll post the video as soon as it’s ready!