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  #571  
Old 08-03-2006, 11:27 PM
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CPMcGraw CPMcGraw is offline
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Quote:
Originally Posted by James Pierson
New design called the XR-1 is a strange spinnoff of a SR-71 with much longer ramjets.


This makes 275 plans. Only 25 to go!
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  #572  
Old 08-04-2006, 11:19 PM
James Pierson James Pierson is offline
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Join Date: Dec 2005
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Default New Design: Sky Wolf

Wow, I finally came up with a good name for this design. I had some major problems with this design because I was trying to use two flat wings on the BT using fin thickness at 4" and plan points at 3/32" and 2" wide. That my friends is not a good cheat as it freaks out Rocksim. I just deleted those stupid flat fins and went with the Bt-50 tube fins. I like the way it turned out better anyway's.

Thanks Again and Enjoy, JP

James Pierson
NAR# 77907
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  #573  
Old 08-05-2006, 12:30 AM
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snaquin snaquin is offline
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Join Date: Jun 2005
Location: Louisiana
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Quote:
Originally Posted by CPMcGraw
Talk about procrastination, I've had this rocket sitting off to one side for so long, I've forgotten how long I've had it. Maybe six years...

The LHS had this LOC Viper 4 in stock probably since the day they opened, and that was long enough for the price sticker to fade, yellow, and crack. I'm not really sure why I bought it, other than I was just looking for "something bigger" than a typical modroc. I didn't particularly care for the fin shape of the Viper, but figured I might find a better fin shape sometime in the future...

Well, it's "Back to the Future" time, and the inspiration is a combination of several EnerJet fin patterns, with a contribution from not just a few Estes models...

The ViperJet 4256...

Length: 45"
Diameter: 2.63" (LOC 2.56)
Fin Span: 12.06"
Weight: 15.5 oz

This is a high-performance cluster model, requiring four (4) 24mm motors. All motor combinations (except the poor E9-8) will reach flight V on a 48" rod, 1/4" diameter.

(4) C11-3..................270'......20 FPS......Margin 4.18
(4) D12-5..................783'......23 FPS......Margin 3.97
(4) D15-6..................992'......11 FPS......Margin 3.93
(2) E9-6 + (2) D12-7......1112'......36 FPS......Margin 3.69
(4) E9-8..................1438'......30 FPS......Margin 3.45 (Needs 56")
(4) E18-8.................2305'......27 FPS......Margin 3.58
(4) E6-8..................2347'......28 FPS......Margin 3.86
(4) F72-10................3879'......47 FPS......Margin 3.31
(4) F32-10................4252'......32 FPS......Margin 3.17
(4) G37-10................5277'......56 FPS......Margin 2.81

The LOC 50" nylon parachute is used for recovery. Use birch plywood, 1/8" thick, for the new fins. All Dv values above 25 need to have their parachute lines reefed to prevent an explosive opening, which may result in a shredder...

Enjoy!



Hey, nice design Craig I really like your ViperJet 4256 and saved it with my other RockSim files!
The Loc 2.56 dia tubing is fairly thin walled and your design for such a large rocket at only 15.5oz moves out pretty well on the black powder motor clusters

I always really liked the Loc Viper III and IV kits but found the Viper IV the more versatile of the two because it could be flown on 2 or 4 motors. Although I have never owned either kit a very good friend of mine has the Viper IV and has had many good flights using chad staging of 4 D12-0's to 4 D12-7's.

Do you have a RockSim file for the Viper IV standard kit that you could post? I'd like to build 4 dummy motor tubes into the design to make it two stage and see what the DV's and altitudes are with 4 D12-0's staged to 4 D12-5(7)'s.

No doubt in my mind that Ron Schultz with Loc was thinking EnerJet 2250/2650 when he designed those two Viper kits .....
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Last edited by snaquin : 08-05-2006 at 12:36 AM.
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  #574  
Old 08-05-2006, 06:52 PM
James Pierson James Pierson is offline
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Join Date: Dec 2005
Location: Washington State
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Lightbulb New Design: Purple Haze

Here is a new design I call the Purple Haze. It uses a ping pong ball as a rear transition that will hide most of the motor. It will fly using the 13mm motors. The image shows you the business end of this design.

Enjoy and Thanks Again, JP

James Pierson
NAR# 77907
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  #575  
Old 08-05-2006, 06:55 PM
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CPMcGraw CPMcGraw is offline
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Quote:
Originally Posted by James Pierson
Here is a new design I call the Purple Haze.


For Experienced modelers?
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  #576  
Old 08-05-2006, 07:01 PM
James Pierson James Pierson is offline
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Thumbs up

Craig said,
Quote:
For Experienced modelers?


LOL, JP

We need to talk to Scott and have him program us some Smiles with some cool guitar ripping sound effects or something.
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  #577  
Old 08-05-2006, 07:18 PM
James Pierson James Pierson is offline
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Join Date: Dec 2005
Location: Washington State
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Default New Design: Sabre Sled

New design called the Sabre Sled. Maybe Santa Claus has decided to upgrade his technology and speed up a litttle.

Enjoy and Thanks Again, JP

James Pierson
NAR# 77907
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  #578  
Old 08-05-2006, 10:42 PM
James Pierson James Pierson is offline
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Join Date: Dec 2005
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Lightbulb Updated Design: Six Shooter

Here I go again with this thing, the Six Shooter. I changed the
transition papers to .0110 thickness and the six fins .0625 thickness.
I also found and Rocksim mistake, as it had the center tube
coupler(part # Est NB-20) as solid which added .5 oz to this design. I
changed the coupler to .0625 thickness and it helped the mass greatly.
Here are some photo's of my recent launch and please forgive my poor
photo editing techniques.

Here are the stats:

Six Shooter - Simulation results
[B4-2]
Launch guide length: 36.0000 In.
Velocity at launch guide departure: 32.7044 MPH
Minimum velocity for stable flight reached at: 29.7878 In.
Velocity at deployment: 5.5232 MPH
Altitude at deployment: 128.32964 Ft.
Maximum altitude: 129.39960 Ft.


[B6-2]
Launch guide length: 36.0000 In.
Velocity at launch guide departure: 32.2724 MPH
Minimum velocity for stable flight reached at: 31.7649 In.
Velocity at deployment: 4.7298 MPH
Altitude at deployment: 126.30121 Ft.
Maximum altitude: 126.90206 Ft.



Thanks Again and Enjoy, JP

James Pierson
NAR# 77907
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  #579  
Old 08-05-2006, 10:59 PM
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CPMcGraw CPMcGraw is offline
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Join Date: Mar 2005
Location: Mobile, Alabama
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Default

Quote:
Originally Posted by James Pierson
Here I go again with this thing, the Six Shooter. I changed the
transition papers to .0110 thickness and the six fins .0625 thickness.
I also found and Rocksim mistake, as it had the center tube
coupler(part # Est NB-20) as solid which added .5 oz to this design. I
changed the coupler to .0625 thickness and it helped the mass greatly.
Here are some photo's of my recent launch and please forgive my poor
photo editing techniques.


This looks good, James. Are you ready to post to the website with it?

Quote:
Here are the stats:

Six Shooter - Simulation results
[B4-2]
Launch guide length: 36.0000 In.
Velocity at launch guide departure: 32.7044 MPH
Minimum velocity for stable flight reached at: 29.7878 In.
Velocity at deployment: 5.5232 MPH
Altitude at deployment: 128.32964 Ft.
Maximum altitude: 129.39960 Ft.


[B6-2]
Launch guide length: 36.0000 In.
Velocity at launch guide departure: 32.2724 MPH
Minimum velocity for stable flight reached at: 31.7649 In.
Velocity at deployment: 4.7298 MPH
Altitude at deployment: 126.30121 Ft.
Maximum altitude: 126.90206 Ft.


Interesting performance comparison. The B6 gets no better performance than the B4, and fractionally not as good. The slower Dv is perhaps the only plus reason for using it, but otherwise the B4 is the optimum motor.

It's also good to see those changes had such a large effect on the simulation. You've gained confidence with the program, too. That's the real 'plus' here.

Good photos, too. You got three out of six streamers in the frame with the main vehicle post-deployment. Looks like a fun model...
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  #580  
Old 08-06-2006, 12:16 AM
James Pierson James Pierson is offline
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Join Date: Dec 2005
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Thumbs up

Thanks for the input Craig. I believe that I got really lucky considering I made this design two years before I rocksim it. Either luck or help from above. I agree with you however that it is a skill level 4 or 5 and please post it at Barclone.

James Pierson
NAR# 77907
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