In keeping with the nature of this private development forum, I am starting this thread for posts dealing exclusively with new model rocket designs that will use some of the new motors we are anticipating from SEMROC. It should be understood that designs presented here cannot be openly discussed on the "public" side of Ye Olde Rocket Forum, as they will contain information which has not been made available to the general public. Therefore, anything presented here will NOT be posted to the BARCLONE website until after such information has been released by SEMROC, nor will it be transferred to the "Scrounged" thread for general release.

I am going to set some additional rules for this thread. While most of the designs on the public "Scrounged" thread presently follow these rules, on this thread they will have to. First: All plans must be submitted in RockSim file format. Second: Include the 2D and 3D exported images from RockSim as visual references. Third: When rendering the 3D image, set the resolution to HIGH, and fill the window with the image; we need the largest 3D image RockSim can produce. Fourth: Send the 3D image as a JPG file, not as a PNG or BMP.

As information comes in on the new motors, special motor files and component CSV files will be created and posted on this thread for exclusive advanced use by the SVDT designers. These files are not to be shared, or made publicly available. These files will also be subject to unannounced change as circumstances warrant.

__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635

The following motor file was developed for testing by adapting the Apogee motors from 1/4A through B. Both 10mm and 15mm sizes have been simulated where possible. The motor power/delay curves have not been modified, but the time delay values have been added to cover a number of choices, generally beginning with 2 or 3 seconds, and going as high as 9 seconds. Some of these values will be arbitrarily high, but it allows for simulation tweaking.

Remember: These motors are for testing only, and do not necessarily represent the final production motors. It's just a starting point.

How to use:

Unzip the SEMROC.ZIP to get the SEMROC.RSE file. Save the RSE file in your DATA folder in the RockSim directory. Open RockSim. Click FILE | Reload Engines. Add the SEMROC.RSE file to the list on the right. Close this window. You can now use the SEMROC motors in your designs.

Attached Files

SEMROC.zip (2.5 KB, 16 views)

__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635

Here is the first BARCLONE design to use a 10mm 1/4A2-4 SEMROC motor. It is a micro version of an early MMI favorite, the Aerobee 150. This one is called the Microbee 150. It is streamer-recovery, and has spectacular performance.

Length: 9.06"
Diameter: 0.448" (Apogee 10.5mm tubes)
Fin Span: 2.188"
Weight: 0.1173 oz

1/4A2-4T......370'......Dv 6 FPS......18" launch rod

Notice the last column -- it takes only an 18" launch rod to reach safe flight velocity.

Also note, I tried to create a new ST-4 body tube for use with these motors, but RockSim declared the diameters to be only usable with 6mm MicroMaxx motors. It would not offer the 10mm motors as an option. This will be tweaked later in the program.

Study the new design and get the feel for what's in the works!

Attached Thumbnails

   

Attached Files

Microbee 150.rkt (104.7 KB, 14 views)

__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635

Here's one I designed a few months ago. It's not designed specifically for any of the new motors (although the design could very easily be adapted), but I thought it would make a neat kit.

The Micro Hustler, a 42.65% scale model of the SLS Hustler. Uses 18mm motors, but could also be adapted to fly on 13mm or 10mm motors. Gets to about 1450' with a C6.

Length: 16.3015"
Diameter: 0.998", 0.759" (ST-9 payload section, ST-7 body)
Fin Span: 4.8751"
Weight: 0.7675 oz

1/2A6-2 . . . . . . 130' . . . . . . Dv 20 FPS* . . . . . . 36" launch rod
C6-7 . . . . . . . . 1448' . . . . . . Dv 26.6 FPS* . . . . 36" launch rod

*Both simulations are "in between" delays, a 1/2A6-3 or a C6-6 would be nice

Attached Thumbnails

   

Attached Files

MicroHustler.rkt (105.5 KB, 14 views)

__________________
David Hash
NAR#77967
http://www.Semroc.com

Pyro,

I modified your design (nice one, BTW...) to use the 10mm motors, with a motor mount based on 10.5mm tubes. Not too shabby results...

Hope you like how this turned out...

ADDENDUM: And no sooner than I get this posted, I discover it needs a long rod (49" long!) to become stable on this motor.

Let me try this one again on 15mm power...

Attached Thumbnails

   

Attached Files

MicroHustler v2.rkt (44.0 KB, 11 views)

__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635

OK, sorry about the weak design with the 10mm motor. It almost worked. The truth is, I ran into the same issue with the A2 motor I've included here. It's a weak motor for this size model.

The B2 and B7 motors are better; the B7 is perhaps the best of the three, jumping off the pad with enough velocity to get stable in 18". The B2 requires a full 36" of launch rod, so it's right at the transition.

Attached Thumbnails

   

Attached Files

MicroHustler v2.rkt (60.9 KB, 13 views)

__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635

All of my engine files are accessed as .eng files. Am I missing something?
James

What you have are RASP files. If you are using RockSim versions 7 or 8, you can import ENG files into the EngEdit program and convert them to RSE (RockSim Engine) files. RockSim reads RSE files only, but the Engine Editor program is where you create new engine values, or (as I'm doing) modify existing data files to appear as the new motors.

__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635

Interesting, as there are no .rse files in my Data folder except the Semroc files you provided. I am using RockSim version 7. I do have an RSEngine.dbs file, though. Nothing happens when I open RockSim and select File>Reload engine data.
James

Interesting. Apogee must have made a change between 7 and 8. I use version 8, and just had it updated in the last week. Let me look into this, and I'll see what can be done.

__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635