What to do with a 9-inch BT-20?

[Cookie the Dog's Owner]

I have a couple of 9-inch lengths of BT-20 and matching nose cones and didn't quite know what to do with them. I decided to play with alternate designs in Open Rocket. First, I made up a file with the body tube, nose cone, and everything else except the fins.

View attachment 9 inch BT-20 (no fins).ork

The I started plating around with variations. Here are a few: sounding rocket-style fins (View attachment 9 inch BT-20 (1).ork), elliptical fins (View attachment 9 inch BT-20 (2).ork), tiny elliptical fins (View attachment 9 inch BT-20 (5).ork), a version with tiny swept fins, capable of insane altitudes on a C6 and and furious kamikaze flights straight into the sound barrier on an 18mm D21 :surprised: (View attachment 9 inch BT-20 (15).ork), an even more insane version of that last one, with a booster stage :y: (View attachment 9 inch BT-20 (15 with booster).ork), and a far more sensible sport flyer with fancy fins. (View attachment 9 inch BT-20 (fancy).ork)

If you want to play along, start with the "no fin" file and post what you come up with. I'd love to see it.

 

[Sooner Boomer]

Try this:
View attachment BT20 new fins.ork
trapezoidal fins, shaped more like sounding rockets I've got. With a D21 it sims to 2361 feet, mach 0.96 (airfoiled instead of rounded fins and you get 2435 feet and mach 0.98). Single-use rocket. You'll never see it again. 3...2...1...Buh-bye!

 

[Cookie the Dog's Owner]

A few I came up with:

The "Firehawk" cruise missile:

View attachment 9 inch BT-20 (Firehawk).ork View attachment Firehawk.pdf

The "Spindizzy, with canted fins, capable of 2,000 RPM:

View attachment 9 inch BT-20 (Spindizzy v2).ork View attachment Spindizzy.pdf

"Parallel Process":

View attachment 9 inch BT-20 (fluted).ork View attachment Parallel Process.pdf

 

[Scotty Dog]

Like the names..Cool
Do you have a "rearview" of the PP?

I ve had the name "Nine Inch Nails" on the brain since first reading this thread.

 

[Cookie the Dog's Owner]

Do you have a "rearview" of the PP?

I worked up two different versions, one with 3 fins and one with 6.

View attachment Parallel Process 3-fins.bmp

View attachment Parallel Process 6-fins.bmp

Not sure yet which one I will build.

 

[Scotty Dog]

I worked up two different versions, one with 3 fins and one with 6.


Not sure yet which one I will build.

Thanks,but,ahhhhhhhhh,I,ummmm,well,I meant to ask for a RV of the Firehawk.

 

[Cookie the Dog's Owner]

Here you are:

View attachment Firehawk rear view.bmp

 

[Scotty Dog]

Here you are:

View attachment 123108

Im liking that!!!!
They are all cool designs and all have great names.
Ild call that a "Hat-trick" :clap:

 

[Cookie the Dog's Owner]

Im liking that!!!!
They are all cool designs and all have great names.
Ild call that a "Hat-trick" :clap:

Thanks for the kind words.