Sprint missile 1/3 scale

[amiles]

My next project is a 9-ft long (1/3-scale), two-stage, tube-launched Sprint missile!

The plan is to use an M6000ST for the booster to get close to 20g acceleration, and then transition to a long-burning L400W for the second stage. The calculated apogee is about 11,500ft.

 

[amiles]

Starting with the second stage motor mount and interstage coupler.

 

[Rschub]

 

[neil_w]

Awesome project. How are you going to stabilize it? Are you just going to rely on the cone?

 

[amiles]

Awesome project. How are you going to stabilize it? Are you just going to rely on the cone?

Just the cone. Plus lots and lots of so much nose weight.

Speaking of which, here is the nosecone on top of the upper stage motor mount and coupler.

 

[yvanthesaxophonist]

This is super sick!

 

[LD124]

Looks awesome! How are you going to constrain it within the launch tube? Some kind of guides that fall away?

 

[amiles]

Looks awesome! How are you going to constrain it within the launch tube? Some kind of guides that fall away?

The plan is to use fall away foam sabots, which is what I've done previously on large tube-launched rockets. You can see an example of them separating and falling away in screenshots from my most recent (and biggest!) launch:

 

[LD124]

The plan is to use fall away foam sabots

Very nice. Foam as in expanded polystyrene or the kind that comes in a spray can?

Those folding fins look interesting, do you have a build thread for that rocket?

 

[amiles]

Very nice. Foam as in expanded polystyrene or the kind that comes in a spray can?

Those folding fins look interesting, do you have a build thread for that rocket?

Two-part expanding poly, which I can then cast in place around the rocket as it sits in a surrogate launch tube.

And yes, here is the build thread for that one, including details on the folding grid fins and the sabots:

https://www.rocketryforum.com/threa...aber-rsd-10-pioneer-irbm.169775/#post-2212637

 

[Johnly]

The plan is to use fall away foam sabots, which is what I've done previously on large tube-launched rockets. You can see an example of them separating and falling away in screenshots from my most recent (and biggest!) launch:

That is stunningly cool.