Howdy

[Ladykate]

I'm a 3D printer geek. Started making rockets and got kinda hooked. Staying with 18mm right now. Was looking for any info on a Genie Air to Air nuke and found it on this website. Here is my latest effort - hasn't flown yet.

 

[KenECoyote]

Welcome! I love the Bullpup, so you've already got a fan

 

[smstachwick]

Hey! Welcome aboard!

Have you gotten an opportunity to try out the Q-Jet 18mm D motors?

 

[Kelly]

LadyKate from rec.pyro? Welcome to the forum!

 

[Cape Byron]

Nice Bullpup. You have our full attention!

 

[Hobie1dog]

nice rocket and stand

 

[Ladykate]

Thanks to all. Since I posted that, I flew it and it was a bit underpowered - but stable. I redesigned the flying version by trimming just about everything and using vase mode for the main tubes. Rocksim says it is good so we'll see... tomorrow, I hope.

 

[smstachwick]

Thanks to all. Since I posted that, I flew it and it was a bit underpowered - but stable. I redesigned the flying version by trimming just about everything and using vase mode for the main tubes. Rocksim says it is good so we'll see... tomorrow, I hope.

What have you got loaded up in there?

 

[Ladykate]

What have you got loaded up in there?

C6-5. Since it is totally printed (no paper tubes or innards) I'm fighting weight. Right now it is only a few grams heavier than the Estes model. Vase mode makes very light (and somewhat fragile) tubes.

 

[rharshberger]

Put a Quest Q-jet 18mm D16 motor in it, should do better.

 

[smstachwick]

Put a Quest Q-jet 18mm D16 motor in it, should do better.

Agreed.

Even a C12 or C18 should improve T:W considerably, and they’re available in delays as short as 4 seconds. You’ll almost always be fighting weight with an end-burner in rockets like this.

 

[techrat]

A question regarding 3D printed rockets: Since the plastic bits are formed by melting plastic "wire" into the the pieces you want, then the plastic is heat sensitive, no? So if you build an entire rocket out of meltable plastic, doesn't the engine heat cause some distortion or melting during flight and/or ejection?

 

[Ladykate]

Hey! Welcome aboard!

Have you gotten an opportunity to try out the Q-Jet 18mm D motors?

Not yet. Saw some at the field today. Very interesting.

 

[Ladykate]

A question regarding 3D printed rockets: Since the plastic bits are formed by melting plastic "wire" into the the pieces you want, then the plastic is heat sensitive, no? So if you build an entire rocket out of meltable plastic, doesn't the engine heat cause some distortion or melting during flight and/or ejection?

Depends. I have a few PLA rockets (all printed). In most cases, the motor can is just fine - I've never had a problem with them - in 18mm size. The worst problem I've had is that when the ejection charge goes, the walls of the main tube heat up a lot. A hard landing will warp them. I'm also experimenting with vase mode and that is a lot more sensitive to heat. However, it is still only the main tube that is affected and then only on ejection of the chute. Here is a rocket that I've flown many times - all PLA - that has never had a problem: