Great question, I’ll have to get creative with internal mass arrangements. I think I’ll model it in OR this weekend and see where things fall to start.Whew! Talk about taking on a project. How do you make something like the ugly thing stable with all those fins?
-Bob
If you can get that look and acheive that perfect exhaust plume that will be awesome!I have a few projects to finish up first, but I have built several low power scale models of the Sprint ABM in the past. I'm planning on getting back in the Sprint business again...
Sprint missile...
View attachment 440172
The ones I did back when (over twenty years ago) ranged from 13mm to 24mm motors and were between 5" and 36" tall. The only one I still have is a boilerplate model about 15" tall for 18mm motors. It's pretty rough these days, but is still a good flyer.
View attachment 440170
I'm going to start with another 18mm version (I still have the patterns), but I really would like to do a large scale for high power.
Make a larger version and put it on a J1799 for realistic acceleration tooI have a few projects to finish up first, but I have built several low power scale models of the Sprint ABM in the past. I'm planning on getting back in the Sprint business again...
Sprint missile...
View attachment 440172
The ones I did back when (over twenty years ago) ranged from 13mm to 24mm motors and were between 5" and 36" tall. The only one I still have is a boilerplate model about 15" tall for 18mm motors. It's pretty rough these days, but is still a good flyer.
View attachment 440170
I'm going to start with another 18mm version (I still have the patterns), but I really would like to do a large scale for high power.
Well, that is kind of the plan...Make a larger version and put it on a J1799 for realistic acceleration too![]()
Looking forward to seing that one! It'll be a real challenge to stage without electronics for the airstartMyself I'm working on a Thales Starstreak as seen below
Calling @hcmbanjo Unless I'm mistaken (again) he entered it for Scale competition and is acquainted with the stability challenges of that airframeBut I have plans for this ugly thing (a Rheintochter R I Missile) in late 2021
A sincere good luck with the scaling. My BT-60 18mm Great Big Inductor (GBI) worked pretty well (except on a D10 composite), but the BT-80 24mm version has not faired as well. I'm thinking the increasing mass and moments of inertia overwhelm the motor induction, and it remains to be seen if composite motors are even suitable for GDSIf I get to it, my unique build would be a Polaris A3 using engine-driven gas-dynamic (induction) stabilization, aka, finless. Would likely start small (13mm engine size). If that works as it should, then scale up to 18, 24 and/or 29mm motors.
I'm not but the little blue folks are making an updated version of theirs:Is anyone working on something, or even just making plans, to attempt something you don’t see every day?
I roughed in a OR simulation for it last night at full scale and needed a steel nose cone tip and 20kg of additional nose weight to get it stable with no engines. Total sim weight 110kg.Whew! Talk about taking on a project. How do you make something like the ugly thing stable with all those fins?
-Bob
The BP versions had a HUGE exhaust plume (for BP) due to the recessed motor! It wasn't that dense of course, but it was every bit as big as the base of the rocket. Sounded weird too... I think the mid/high power versions would be pretty spectacular on White Lightning propellant!If you can get that look and acheive that perfect exhaust plume that will be awesome!
The operational Sprints were launched vertically from a silo. They were basically blown out of the silo by a gas charge and ignited the first stage as it exited the tube. It would then make an abrupt turn in the direction required and accelerate to Mach ten or so in the low atmosphere.If only it were legal to launch at that low angle the effect would be sweet.
Tough recovery experience though.