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Great descriptions. The risk of glomming lube on the o-rings is that it might lift the ring and ignite the lube leading to another booster disaster.

I believe the instructions say to grease the threads so it's easier to take apart afterwards. Nothing sucks more than a seized case.

Nice video. But here is a couple tips from someone that has used these loads since they first came out in the 90's (the 2 grain version came out later). 1.) DO NOT GREASE THE DELAY O-RING. Since the o-ring does not have to twist into something, it is not needed. Also the grease can contaminate the ejection charge and make it weak or worse case senario not fire at all. This is especially true on a hot summer day and the rocket sits on the pad for a while. Only RMS+ Delay assemblies you want to grease the delay o-ring (but not the delay washer) and you have to be careful not to get any grease on the end of the delay grain. 2.) Taping the grains together is not really necessary and just makes loading the motor more complicated. I just stick them in the liner and look down the core. Aerotech has done testing to see if the grains have to be perfectly lined up, and they determined they don't have to be.

It was a nice build. I launched it 5 times, 4 of those were beautiful flights, the last one it was a victim of rod whip or some other phenomenon. It ascended about 30-50 feet and proceeded to turn near horizontal, it went in the river or was eaten by the trees.

Another outstanding model rocket video. The Sandhawk fins are very impressive and most likely impart fantastic stability in flight. Extra detail pieces are a plus. also. In the past I have built the old Estes Sandhawk kit and also have an unbuilt kit in my stash. I may have to purchase a Rocketarium version for a comparison, the Estes version does use a considerable amount of plastic in their kit however. Nice video. You do make it so simple. Bravo!

Thanks this helped guide me to build mine 😊

You could make the yellow body tube the bottom so the motor mount is easier to install

I really appreciate these videos as a noob model rocket builder (at 60 yrs old). Can you share what you use for your "universal bonding primer" please?

Apply to nasa

thank you you, you helped a lot

In watching this one more time, your assembly techniques are quite addictive and it amazes me that your cutting board is devoid of old glue blobs and paint spots! Neat work to say the least. Thanks for the video!

Followed Step By Step - Thanks!

Man I appreciate you doing this but it's an hour long and I wish you would edit it.

Reminds me of the Gnome, with different colors. Looks like a fun little build. Thanks for another great video!

Good flight!

The "Flash" Rocket kit with the launcher has the exact same rocket with a silver tube... so this video is extremely helpful for assembling that rocket as well.

"I have too many rockets," said no one ever.

Brilliant video. Great help.

great video! any tips for how to pack the chute so it has the best chance of working? Practically, a streamer looks better but chutes are fun

doesn't that mount method put the cord RIGHT in the path of the ejection charge gas and heat? How does that work?

This was so helpful! Thank you so much 😊

Elmers glue on a model rocket is diabolic

Thank you so much for the build video. I learn best being an auditory learner.

Please help me understand... why not put the forward engine mount ring up further forward? it doesn't seem to be helping with fin mount etc... and you quibbled about motor wobble at the closser placement

Super nice flights great job

Thanks! This is timely: LOC discounted this kit on black Friday so now one is on its way to my house. After building several Estes kits and attending a high-power launch it seemed like the right time to try something bigger, and your pair of videos answers a bunch of questions in advance.

My daughters and I built one of these employing your supplements to the kit instructions. When we prepped it to fly, the motor was exceptionally loose fitting. I put a tiny bit of masking tape on the motor to keep it from falling out on the pad. The rocket flew quite well, however at ejection, the styrofoam ball blew into 3 pieces. Looking at the remains, it seems the engine block blasted out forward like a shotgun wad and caused the destruction. Such an odd rocket, we are gonna try again.

Perfect video

I remember these from like 10 years ago when they were sold separately...didn't know they were still available....cool.

When doing the Fillets on the fins could i use an epoxy putty?

Really nice flights. Awesome job!!

Congratulations on a successful day of launching!

Great flights guys ! Like those close recoveries

How did you paint the nose cone black through the lattice? If I had read ahead I would have painted the capsule before attaching the tower!

I dry fit all the fin bits and beveled them before gluing.

My 3 capsule pieces were too large to fit in the base groove. I had to sand one edge down a LOT to get it to fit. Ultimately it did.

Can I request you do the estes Explorer Aquarius? It looks like they may not be producing it anymore.

Excellent tutorial! Thank you for explaining everything in detail.

Hello, I was wondering, since the parachute has the protection around it, would it be better to insert that into the rocket first and then the shock cord, so it would be protected from the hot gasses? Also, the parachute would help push the shock cord out of the body tube. Great job on the Rocket! Thank you for taking the time to share.

Like your body tube cradle you made,great idea

Why use CA to tack the fins to the motor mount? Why not use epoxy, which is much stronger?

I was expecting a promo for Wendy's

I hate music.

Is this a BT-50 tube???

Where do you get the longer rivets?

I love the KSR-420. It's just an atteactive design. I've not built the Rocketarium kit but I did build a smaller (BT-55) scratch-built version. I have wanted to build a 4" high-power version but have never gotten around to it. Lovely work on this one.

You gotta make it so we can see the WHOLE wocket when you are done! 😱😁👍👍🇺🇸

A viewer pointed out the the fins should go the other direction than how I built it. He was correct, but the rocket will fly with the fins in either direction.

I like these videos but they would be significantly improved by showing a launch at the end.

"white glue or wood glue" what happened to your "white wood glue"?