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  #311  
Old 12-04-2008, 06:56 PM
rkt2k1 rkt2k1 is offline
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Join Date: Mar 2005
Posts: 131
Default New Design: Sub-Assembly Examples

Here are a couple of sub-assemblies I put together a while back. I developed these while working on a BT-70 based cluster design.

They are FlisKits Engine Mounts:

- EMK3-24-70
- EMK3-24-70R

Let me know what you think of these and if there is interest in similar sub-assemblies. I would think the rocketry vendors would be interested in having there parts and components available for use within Rocksim.

Thanks,

... Bill

P.S. I had to rename the .RSA files to text files to upload to post. Just remove .TXT extension and add to your Rocksim \Data directory.
Attached Thumbnails
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Name:  EMK3-24-70.JPG
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Name:  EMK3-24-70R.JPG
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Attached Files
File Type: rkt EMK3-24-70.rkt (18.7 KB, 63 views)
File Type: rkt EMK3-24-70R.rkt (19.7 KB, 61 views)
File Type: txt EMK3-24-70.rsa.txt (12.9 KB, 70 views)
File Type: txt EMK3-24-70R.rsa.txt (13.7 KB, 67 views)

Last edited by rkt2k1 : 12-04-2008 at 06:59 PM. Reason: Added RSA files.
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  #312  
Old 12-05-2008, 12:53 AM
CPMcGraw's Avatar
CPMcGraw CPMcGraw is offline
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Default New Design -- Sort Of...

Folks,

Here's a good reason to use RockSim when designing your models. I just got my RS8 back up, and worked out the basic plan for "Shooting Star".

Check out the attached screenshot. Note the Dv numbers...

The good news is, it reaches safe flight V on a 36" standard rod.

More work to be done before this sketch is flight ready...
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Name:  Shooting Star Simulation Run.jpg
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Size:  315.7 KB  
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File Type: rkt Shooting Star.rkt (65.6 KB, 59 views)
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  #313  
Old 12-05-2008, 12:55 AM
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CPMcGraw CPMcGraw is offline
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Default

Quote:
Originally Posted by CPMcGraw
The general recommended minimum is about 40 FPS safe flight V off the end of the rod. Anything below that is asking for trouble.


OK, the suggested minimum in RockSim is 44 FPS, and the trip value is 43.999 FPS. I knew it was 40-something...
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  #314  
Old 12-05-2008, 01:41 PM
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CPMcGraw CPMcGraw is offline
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Exclamation New Design (Official) -- Shooting Star

OK, I'm going to make this an official design with this post. I've tweaked the design as far as I think it will go, mostly in the way the two forward rings are represented. They are now simply "inside tubes" instead of "ringtail fins". This brings the margin up to a more respectable number, and is likely closer to the 'real world' build performance.

Length: 22.70"
Diameter: 0.908" (ST-8); 1.556" (PPB)
Fin Span: 3.94" (BT-101)
Weight: 1.38 oz

B6-2......150'......Dv 7 FPS......36" x 1/8" rod (Flight V at 27")
B4-2......155'......Dv 8 FPS......36" x 1/8" rod (Flight V at 23")

The 3D image shows an approximated location for the dowel supports for the rear ring.

Enjoy!
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Name:  Shooting Star 2D.jpg
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Name:  Shooting Star 3D.jpg
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Attached Files
File Type: rkt Shooting Star.rkt (66.3 KB, 100 views)
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  #315  
Old 12-06-2008, 06:29 PM
James Pierson James Pierson is offline
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Join Date: Dec 2005
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Default New Re-Design: Crazy Bee II

Quote:
Originally Posted by johnnwwa
Hey James
Another great design such coolness.
Remember that 13mm tube fin rocket you gave Conner at our last launch well . we cut down the streamer a tad loaded up a A3-4 and this thing scoots would you please post a sims photo/drawing, parts list SEMROC parts of course or pm me. I'd like to build one or possible upscale to a 18mm ABC.

Thanks
John

Also posted our OPROC club launch site on Google Earth.



Here it is John . I called it the Crazy Bee and it is just an small 13mm design that I put
together with some scrap parts. I had to rework the file quite a bit because Rocksim is still
quite inaccurate when it calculates drag for both Tube fins and Ring fins. I am glad that the
test flight went well for you and Conner. We'll turn Conner into an Mad Rocket Scientist/Designer yet .

This design does have some custom parts to it unfortunately. I designed it before I began to design rockets from off the shelf parts . You will have to cut the (2) 1/2 inch long rings fins from the ST-1620.

PS. John, I will try to work on an upscale soon, JP.

Crazy Bee II Parts List
Nose Cone.............1-Qty.......BC-524
Main BT..................1-Qty.......ST-5120
Thrust Block.........1-Qty.......TB-5
Eye Screw.............1-Qty.......SE-10
Shock Cord...........1-Qty.......EC-112
Tube Fin.................3-Qty.......ST-590
Ring Fin..................1-Qty.......ST-1620.....cut into (2 Qty.) 1/2 inch lengths.

Enjoy and Thanks Again, JP

James Pierson
NAR# 77907

Crazy Bee II (13mm)
Launch guide length: 36.0000 In

MOTOR.................MAX. ALTITUDE...........DEP. VELOCITY
1/4A3T-3..............130.61647 Ft.............13.8283 ft/s
1/2A3T-4..............301.22179 Ft.............13.2720 ft/s
A3T-4.................605.50853 Ft.............10.8764 ft/s

.
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Name:  Crazy Bee II 2D Image #2.jpg
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Attached Files
File Type: rkt Crazy Bee II 13mm.rkt (63.5 KB, 69 views)
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  #316  
Old 12-06-2008, 06:33 PM
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CPMcGraw CPMcGraw is offline
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Default

James,

I notice this one isn't in the list. Was Crazy Bee II ever posted in one of the BARCLONE "Scrounged" threads? Can I add it to the growing list?
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  #317  
Old 12-06-2008, 06:43 PM
James Pierson James Pierson is offline
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Thumbs up

Quote:
Originally Posted by CPMcGraw
James,

I notice this one isn't in the list. Was Crazy Bee II ever posted in one of the BARCLONE "Scrounged" threads? Can I add it to the growing list?


Please Do Carig. I just did some looking and realized I had never posyed it . Must be that Dain Bramage again!

Also just found and upscale 18mm for John that I called the Crazy Train. I will have to rework the file as "Rocksim is still quite inaccurate when it calculates drag for both Tube fins and Ring fins". Sure wish TVM would fix this!!!

James Pierson
NAR# 77907
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  #318  
Old 12-06-2008, 10:52 PM
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CPMcGraw CPMcGraw is offline
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Default Design Count Update

508...
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  #319  
Old 12-07-2008, 12:12 AM
rkt2k1 rkt2k1 is offline
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Default Final Design: Falcon Rocket Racer

Quote:
Originally Posted by rkt2k1
This design was inspired by the aircraft from the Rocket Racing League. (http://www.rocketracingleague.com/) I chose not to include the prevalent carnards in my design.

While this model utilizes standard parachute recovery, but I would like to eventually get the model to glide recover, kicking out the motor with either a streamer or parachute for recovery. I've seen this technique used on the Estes Space Shuttle and SR-X models.

The balsa fins (wings) are laminated with 110# cardstock for strength. Carbon fiber tape could also be used to strengthen the fins further, especially the longer ones. TTW is used wherever possible.

A version with wing-tips will need to wait for RS9 to model properly.

Thanks,

... Bill

Name: Falcon Rocket Racer
Engine Size: 18mm
Launch Guide Length: 36.0000 In

Min velocity for stable flight reached at 25.775" (C6) and 26" (B4).

Motor Max Altitude Dep. Velocity

B6-4 271.42 21.51
C6-5 652.79 18.49



Here is the final version of my Falcon Rocket Racer model based on aircraft of the Rocket Racing League. I added cockpit windshield and canopy, tweaked the stability and performance numbers, and added some graphics to improve visual presentation of design.

Name: Falcon Rocket Racer

Launch guide length: 36"


Engine B6-4

Min velocity for stable flight reached at 26.91"

Dep. velocity 28.82 ft/s.

Max altitude: 224.26 ft.



Engine: C6-3

Min velocity for stable flight reached at 25.82".

Dep. velocity 18.48 ft/s.

Max altitude: 498.39 ft.


Thanks,

... Bill

P.S. Please note, textures on Main Body Tube and V-Tail fins should have "Rotate around R-Axis" selected. Rocksim does not seem to be saving this setting in design file correctly. Attached images are correct.
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Name:  Falcon Rocket Racer Design.jpg
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Name:  Falcon Rocket Racer Beauty Shot.JPG
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Attached Files
File Type: rkt Falcon Rocket Racer.rkt (73.8 KB, 85 views)

Last edited by rkt2k1 : 12-07-2008 at 12:42 PM. Reason: Oops! Forgot Launch Lug - Updated Rocksim Design File
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  #320  
Old 12-07-2008, 12:31 AM
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CPMcGraw CPMcGraw is offline
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Default Design Count Update...

509...
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