Rocket 2 XXL, HPR lvl 1 cert rocket

[Voyhager3]

For my L1 I decided I wanted to build an even further scaled up Rocket 2, this time to a 4inch airframe.

Rocket 2, standard size
Rocket 2 XL, 200% scaled

Rocket 2 Family so far
R-2 XXL will only be about 1.2 meters tall, but it’ll probably be fine.

 

[Voyhager3]

So, let’s begin.

 

[hobie1dog]

plenty of pictures yes

 

[Voyhager3]

I was getting ready to print out the fins, then I found out they are too large to print on my printer . So I have to hand draw them now…

 

[tsmith1315]

I was getting ready to print out the fins, then I found out they are too large to print on my printer . So I have to hand draw them now…

Have you tried printing them on more than one page and tacking the prices together?

 

[Voyhager3]

Have you tried printing them on more than one page and tacking the prices together?

That’s what I do for my RC plane plans, but those pre pre formatted, and I only use Openrocket. But if you have any suggestions, that would be helpful.

 

[tsmith1315]

That’s what I do for my RC plane plans, but those pre pre formatted, and I only use Openrocket. But if you have any suggestions, that would be helpful.

I was thinking OpenRocket prints 1:1 size, even if they're split onto multiple pages.

 

[Voyhager3]

I was thinking OpenRocket prints 1:1 size, even if they're split onto multiple pages.

My worry was that the fins would be 1:1, but there would be a void where the printer prints margins, and OR wouldn’t account for it. But it turns out it does so that’s nice

 

[Voyhager3]

This is why we make test pieces!
Fin tab was too short

 

[tsmith1315]

Fin tab was too short

Surprisingly short, at that!

 

[Voyhager3]

Surprisingly short, at that!

I think what happened is that I fixed it in OR, but didn’t save it and then forgot to double check before I printed the template

 

[Voyhager3]

Is 5-minute epoxy good enough for secure the centering rings to the MMT and the airframe? Or how should I do that, because I feel that every video I see just says “epoxy”. And I can also get 5-min at the store.

 

[jmasterj]

Is 5-minute epoxy good enough for secure the centering rings to the MMT and the airframe? Or how should I do that, because I feel that every video I see just says “epoxy”. And I can also get 5-min at the store.

Should be fine, but 5 minutes is pretty short. If you can find 15- or 30-minute hobby epoxy you'll probably have an easier time of it.

 

[tsmith1315]

Is 5-minute epoxy good enough for secure the centering rings to the MMT and the airframe?

Any epoxy will be stronger than the tube & rings, but like @jmasterj said, 5-min is a short working time. It could lead you to set something into place before you're ready. The materials will work if you're up to it. I'd recommend peeling the glassine layer from the area to be glued on the outside of the MMT.

 

[jmasterj]

I'd recommend peeling the glassine layer from the area to be glued on the outside of the MMT.

Just wipe it with a wet paper towel, that will take off the glassine.

 

[tsmith1315]

Just wipe it with a wet paper towel, that will take off the glassine.

I'll have to try that again, maybe I wasn't patient enough.

I score the outline with a sharp razor and the top layer lifts right off, super easy.

 

[Voyhager3]

Should be fine, but 5 minutes is pretty short. If you can find 15- or 30-minute hobby epoxy you'll probably have an easier time of it.

Any epoxy will be stronger than the tube & rings, but like @jmasterj said, 5-min is a short working time. It could lead you to set something into place before you're ready. The materials will work if you're up to it. I'd recommend peeling the glassine layer from the area to be glued on the outside of the MMT.

Yeah good call, since I’m still not super experienced with epoxy, i think the 15min will be better, and it’s on sale on Amazon rn so I will order some.

 

[Voyhager3]

Just wipe it with a wet paper towel, that will take off the glassine.

I’ll do that, I was just watching a video where they said that would work for the loc tubes.

 

[G's Monster Rocket]

Is 5-minute epoxy good enough for secure the centering rings to the MMT and the airframe? Or how should I do that, because I feel that every video I see just says “epoxy”. And I can also get 5-min at the store.

I used the J B Weld 5 minute epoxy on mounting the centering rings to all my 38 mm motor tubes and setting the fin root onto the motor tube between centering rings, without any issues or problems on both my L1 and L2 rockets. I did use Total Boat Thixo Fast Setting thick epoxy as fillet material on the fin root inside the rocket and outside. I did have an issue where I didn't let the initial JB Weld completely cure before putting on the Thixo. In that instance, the Thixo did NOT set up correctly and had to be removed and reapplied after I cleaned up the area and prepped it again.

 

[Voyhager3]

Welp, here goes nothing I guess
They will be cut on the table saw, and I’ll cut small areas with a hand saw or Dremel tool or something

 

[Voyhager3]

I’m getting ready to cut the mmt down to size, and I was wondering if there was a recommended amount of volume/length I should leave between the upper ring, and the bottom of the nose cone?

 

[waltr]

I do not like the Grain orientation on the fins. I prefer the grain to be parallel to the fin leading edge.

Length of BT between MMT and nose needs to be large enough for ALL the Recovery pieces. Chute, Nomex or wadding, cords.
Do you have all the recovery parts? Then pack every thing into the tube and measure the length needed then add some.

 

[Voyhager3]

I do not like the Grain orientation on the fins. I prefer the grain to be parallel to the fin leading edge.

Length of BT between MMT and nose needs to be large enough for ALL the Recovery pieces. Chute, Nomex or wadding, cords.
Do you have all the recovery parts? Then pack every thing into the tube and measure the length needed then add some.

That’s the problem, I don’t have the chute yet, but I could find the dimensions and make one from a trash bag or something for a mock-up

 

[Voyhager3]

It think I can have it done by the launch day, well, mostly. And do the final touches launch day, or get the parts Saturday and fly Sunday. With the full paint-up
Midsize sedan for scale

 

[hobie1dog]

orange white and black paint scheme?

 

[Voyhager3]

orange white and black paint scheme?

You know it!
It’s going to be a more complex version of r2 xl, with the fin design being copied to also be on the leading edge, and stripes from the upper orange ring to the fins.

 

[Voyhager3]

I’m not too good with drawing on the phone

But this is what I’m going for

 

[Voyhager3]

Spirals filled and sanded!

 

[hobie1dog]

what brand of primer are you going to spray on it?

 

[Voyhager3]

what brand of primer are you going to spray on it?

I use a Rustoleum paint and primer 2 in 1, which I have in black and white. And semi gloss white and orange. And then Krylon black paint and primer, but I’ll probably buy Rustoleum instead, since krylon is just not great.