Ye Olde Rocket Forum - Designer's Corner

#11

01-09-2007, 05:58 PM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

Quote:

Originally Posted by Pyro Pro

Well, I was just reading over the motor thread, and saw a mention of ST-6 body tube for 15mm motors, with an OD of 0.62". That would be a more "to scale" size for the command module body (actual size is somwhere arount .65"), and could replace the current ST-5 tube.

The ST-6 is my own creation -- it doesn't actually exist yet. I needed a tube to use as a motor tube for the 15mm, so I created those specs to "fit" the motor casing with similar play to the ST-5 using the 13mm motors.

OD = 0.620"
ID = 0.594"
Wall Thickness = 0.013" (Same as ST-5)

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#12

01-09-2007, 07:07 PM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

New Plan -- Whippit

Here's an example of what we could be doing in the area of two-stage models once we get the booster motors. This design is tweaked for 10mm motors.

Length: 23.45"
Diameter: 0.908" (ST-8)
Fin Span: 4.41"
Weight: 1.105 oz

A8-0 | 1/2A6-5......430'......Dv 25 FPS
A10-0 | A8-5........700'......Dv 2 FPS
A8-0 | A10-5........724'......Dv 12 FPS
A10-0 | A10-4.......750'......Dv 22 FPS
A8-0 | A3-5.........755'......Dv 5 FPS
A10-0 | A3-5........780'......Dv 5 FPS

The model qualifies as a "Schoolyard Sounder" by using motors 13mm or smaller [I may allow 15mm motors here, but not just yet.] All motor combinations reach flight velocity on a 36" standard rod.

Enjoy!

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#13

01-09-2007, 07:29 PM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

New Plan -- Whippit-X

In the spirit of the Farside-X, here is the Whippit-X.

Length: 22.5"
Diameter: 1.04" (ST-10)
Fin Span: 4.41"
Weight: 1.16 oz

A8-0 | 1/2A6-4......410'......Dv 7 FPS
A10-0 | A8-5........668'......Dv 5 FPS
A8-0 | A10-5........700'......Dv 14 FPS
A8-0 | A3-5.........725'......Dv 9 FPS
A10-0 | A10-5.......726'......Dv 13 FPS
A10-0 | A3-5........750'......Dv 8 FPS

All motor combinations reach flight velocity on a standard launch rod.

Enjoy!

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#14

01-09-2007, 07:44 PM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

Micro Hustler, Take IV

Better results using the most-recent motor file...

Length: 16.3"
Diameter: 0.998" (ST-9)
Fin Span: 4.875"
Weight: 0.83 oz

1/2A6-3......121'......Dv 15 FPS
A8-4......358'......Dv 3 FPS
A10-4......413'......Dv 4 FPS
A3-4......421'......Dv <1 FPS

Thanks for the great design, David. This is going to be a popular model when those motors finally come on-line. I like this one!

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#15

01-09-2007, 08:11 PM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

Updated Semroc Motor File [Preliminary Data]

Version 4. I added the Quest A6 and B6 sizes to the 10mm and 15mm lines.

Same installation instructions as before.

Attached Files

SEMROC.zip (5.5 KB, 10 views)

#16

01-09-2007, 08:19 PM

rocket_james rocket_james is offline

Ye Olde Rocketeer

Join Date: Jan 2007

Location: DFW Area, Texas

Posts: 58

Quote:

Originally Posted by CPMcGraw

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.

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

#17

01-09-2007, 08:35 PM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

Quote:

Originally Posted by rocket_james

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.

#18

01-09-2007, 09:01 PM

rocket_james rocket_james is offline

Ye Olde Rocketeer

Join Date: Jan 2007

Location: DFW Area, Texas

Posts: 58

Quote:

Originally Posted by CPMcGraw

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

#19

01-09-2007, 09:25 PM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

Quote:

Originally Posted by rocket_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.

#20

01-09-2007, 09:36 PM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

New Plan -- Triplet

Another cluster of 10mm motors. This design is a 5-fin sibling to the Snitch.

Length: 22.8"
Diameter: 1.04" (ST-10)
Fin Span: 4.04"
Weight: 1.26 oz

(3) 1/2A3-4......365'......Dv 5 FPS
(3) A6-5.........602'......Dv 11 FPS
(3) A8-5.........667'......Dv 13 FPS
(3) A10-5........795'......Dv 3 FPS
(3) A3-5.........819'......Dv 15 FPS

Enjoy!

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