Ye Olde Rocket Forum - Scrounged-Up Designs 2006

#241

03-10-2006, 11:53 PM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

Quote:

Originally Posted by James Pierson

I meant to add this one to the last post but forgot. I need alot of help tweaking this one Craig. I still dont like the velocity at ejection, but motor choices are limited.

I call it the Master Blaster. Kind of a retro/vintage/ Galactic Pirates spinoff. I think that the Sandman might appreciate this one the most. Enjoy.

James Pierson
NAR #77907

Wicked!

Nothing to change on this one, James. You have good Dv's and a great margin with that C6. One thing to note on your simulation runs -- the C5 has been OOP for a long time. There might be a few packs still available, but they're not widely available. I wouldn't use them in simulations except as a comparison for what "might be possible, if only..."...

3D image attached below...

Attached Thumbnails

Click image for larger version

Name: Master_Blaster.jpg
Views: 119
Size: 65.7 KB

__________________
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

#242

03-11-2006, 09:58 PM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

New Plan -- Spike

Another in the "Schoolyard Sounders" series, this is a minimal-diameter, minimal-component, highly aerodynamic model ideal for small field operation.

Performance is BVR with any motor above the 1/4A3-3T.

Motor........Alt........Dv........Max Accel
A3-4T.......1018'.....75 FPS.....1111 FPS/S
A10-3T.......928'.....98 FPS.....3260 FPS/S
1/2A3-4T.....500'.....27 FPS.....1683 FPS/S
1/4A3-3T.....205'.....10 FPS.....1085 FPS/S

Skill Level 1.

Use only the 1/4A3-3T or 1/2A3-4T for general flights. Use extreme caution with the other motors.

Enjoy!

Attached Thumbnails

Click image for larger version

Name: Spike.jpg
Views: 125
Size: 38.0 KB

Attached Files

Spike.rkt (24.8 KB, 104 views)

#243

03-12-2006, 10:31 PM

James Pierson James Pierson is offline

Master Modeler

Join Date: Dec 2005

Location: Washington State

Posts: 654

Mini Jet #3

Craig the Spike looks great. What is your opinion of minimal Dia rockets with motor retension of just a tape friction fit. Are we OK with the NAR saftey code or do we to somehow hide a retaining hook?

Anyway here is Mini Jet #3. Enjoy. JP

James Pierson
NAR #77907

Attached Files

Mini Jet #3.rkt (49.6 KB, 69 views)

#244

03-12-2006, 11:18 PM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

Quote:

Originally Posted by James Pierson

AFAIK, tape / friction fit is still acceptable. Some designs simply will not allow the use of a hook, and even some HPR designs don't bother with them.

#245

03-12-2006, 11:27 PM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

Quote:

Originally Posted by James Pierson

...here is Mini Jet #3. Enjoy.

James,

My only revision was to cut your ballast in half, but this wasn't really nescessary. Your numbers were below 10 FPS on both motors. I managed to get below 5 FPS with this trim, but it makes the model unstable if you should ever want to use the full A3-4T. Simple solution? Don't use the A3-4T, or the A10-3T. These are much too powerful for this size model.

Very nice!

Attached Thumbnails

Click image for larger version

Name: Mini_Jet_#3 B.jpg
Views: 119
Size: 42.1 KB

Attached Files

Mini_Jet_#3 B.rkt (49.6 KB, 93 views)

#246

03-12-2006, 11:32 PM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

Quote:

Originally Posted by James Pierson

Craig the Spike looks great. What is your opinion of minimal Dia rockets with motor retension of just a tape friction fit?

As for an opinion, I don't have any problem with it. I think in some of the designs that Estes, for example, has put out recently, and even some classic designs, like the original Century Javelin, it was an unnescessary addition. There was no real benefit gained. For larger models, a motor hook can make removal easier, but that's about all. They're a convienience item, not an absolute necessity.

#247

03-14-2006, 04:15 PM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

New Plan -- Rogue Bear

This design borrows from several earlier BARCLONE models, including some very recent contributions...

I noticed some curious things in RockSim as I worked the numbers. The canards actually increased the static margin by several points, as compared to not having them at all. This must be a critical shape and position result, as most texts on the subject suggest that canards normally reduce the margin, which is why we typically use only tiny, dress-up fins ahead of the CP/CG points. These, most interestingly, are active aerodynamic contributing surfaces on this model.

Give this one a Skill Level 3 for complexity.

Model flies with a 1.65 margin using the C6-5, and a 2.07 using the B6-4.

B6-4.....275'.....21 FPS
C6-5.....635'.....22 FPS

Other motors are not recommended.

Enjoy!

Attached Thumbnails

Click image for larger version

Name: Rogue Bear.jpg
Views: 109
Size: 46.0 KB

Attached Files

Rogue Bear.rkt (68.1 KB, 71 views)

#248

03-14-2006, 11:35 PM

James Pierson James Pierson is offline

Master Modeler

Join Date: Dec 2005

Location: Washington State

Posts: 654

Craig, the Rouge Bear is one sweet design. I still have not figure out how you are doing the sub assemblies.

Quote:

This design borrows from several earlier BARCLONE models, including some very recent contributions...

Anytime, but I hope for the same in return. I'm thinking of an Maxi-Spike.

James Pierson
NAR#77907

#249

03-14-2006, 11:58 PM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

Quote:

Originally Posted by James Pierson

Craig, the Rouge Bear is one sweet design. I still have not figure out how you are doing the sub assemblies.

Anytime, but I hope for the same in return. I'm thinking of an Maxi-Spike.

James Pierson
NAR#77907

I'm not only hoping for it, I'm counting on it!!!

I haven't mastered the subassemblies yet, but they're not hard to set up. RocSim saves subassemblies in their own special file, then pulls out the code when you use it. Like a DLL in Windows programming...

#250

03-15-2006, 11:37 PM

CPMcGraw

BARCLONE Rocketry

Join Date: Mar 2005

Location: Mobile, Alabama

Posts: 5,357

New Plan -- Spectral Queen

Here's a challenge build...

This model is a cluster, but the main body tube has no motor tubes inside. The engine pods are actually the motor tubes, with the deployment gasses vented through the pylons into the main tube. An internal stuffer tube reduces the volume of the pressurized area to allow the pair of 13mm A10-3T motors to deploy the laundry.

The pylon patterns shown in RocSim are distorted in the 3D rendering, but it's the distorted view that needs to be cut. The pylons are supposed to contour around the tail cone in the way the 3D image makes it appear.

RocSim says this model will actually fly, and fly well:

(2) A10-3T.....198'.....6 FPS

I'm setting this as a Skill Level 3.

Attached Thumbnails

Click image for larger version

Name: Spectral Queen.jpg
Views: 133
Size: 34.9 KB

Attached Files

Spectral Queen.rkt (66.4 KB, 108 views)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode