BARCLONE Designer's Studio 2008
Welcome to BARCLONE's Designer Studio, a thread dedicated to the development of new model rocket designs using classic construction methods, modern materials and software creation tools. All persons interested in designing models are encouraged to participate by posting their work here for others to study and critique, giving you a "peer review" by fellow model builders, flyers, designers, and even manufacturers. Generally speaking, the best review you can receive because it comes from people just like yourself!
BARCLONE was started with the ideal of "BARs Helping BARs", and that ideal is carried forward in this thread. Feel free to submit and post your work here, and listen to the advice offered. Because that's the point -- making the hobby more enjoyable not only for yourself, but for others as well.
The thread is now OPEN.
New Plan -- Say Cheese
To inaugurate this thread with the first new plan we have the Say Cheese, which as the name implies, is a Camera Ship. It has been trimmed to reach 800' consistently on a D12-5, and is intended to fly the Aiptek Mini Pen like TBZEP uses in his modified Stormcaster.
The starting point for this design is a Screamin' Mimi, with the main tube cut into 12" and 6" lengths. To save weight, I used a simple 0.07" thick matteboard bulkhead and a tube coupler instead of a solid balsa bulkhead to join the payload body to the booster body.
Fins are standard 1/8" thick balsa.
A 48" x 3/16" rod is needed to reach a safe flight speed. The camera is listed as 45g, and I allowed 50g to account for the needed padding and support. With that much mass to move, even the reliable D12 can't push hard enough to get it off in less than 38".
Diameter: 1.637" (BT-60)
Fin Span: 4.13"
Weight (with camera): 5 oz
Weight (without camera): 3.25 oz
If you fly the rocket without ballast, you will need to reef the parachute shrouds, as the Dv is above 25 FPS. The unballasted altitude is over 1030', or 330' better than with the camera. Use the 48" rod for unballasted flights as well.
Enjoy! And, if you build it before I do, you're obligated to share some in-flight videos!!!
New Plan -- Sky Lance
Another reuse of an old name...
This is a 13mm cluster ship, probably Skill Level 3 for difficulty. It requires some very careful surgery on a BC-1032 (used as the tailcone) to fit the ST-5 tubes through without breaking the remaining balsa. Also, you will need to cut and trim the ST-5 tube where it overlaps the ST-10. The gaps must be sealed completely, as the deployment pressurization would escape otherwise. The ST-10 does not need to be slotted. Study the 2D and 3D images carefully to see what I'm trying to describe (poorly) in words.
Note the override in the mass of the tailcone, reduced about 30%. The final piece will likely be even less mass than this, considering what has to be removed to fit the tubes. This is critical to the simulation, as it has much higher Dv numbers if left "stock".
Diameter: 1.04" (ST-10)
Fin Span: 5.44"
Weight: 2.13 oz
(2) 1/2 A3-2T......120'......Dv 18 FPS.......23" guide length required
(2) A3-4T..........383'......Dv 3-7 FPS......33" guide length required
Don't try this with the 1/4 A3 as it never gets above 35'. The A10-3T is also not recommended as the Dv is above 30 FPS.
New Design: Solar Sailor III
Another recycled name here as well ;) .
Here is another design I decided to call the Solar Sailor III after its two predecessors. This design will carry a 24 inch chute as well. The Dv's are a little high for the B4 and B6 so I reccomend flying this design on the C6-5.
Enjoy and Thanks Again, JP
Solar Sailor III (18mm)
Launch guide length: 48.0000 In
MOTOR.................MAX. ALTITUDE...........DEP. VELOCITY
B4-4..................205.06955 Ft............30.0259 ft/s
B6-4..................229.79921 Ft............25.3781 ft/s
C6-5..................640.47572 Ft............8.5704 ft/s
New Plan -- Aiptek Mini PenCam 1.3 Rocket
A two-stage PenCam carrier .....
While waiting the five days for my two Aiptek Mini PenCam 1.3 cameras to arrive, I set out to build a quick and basic rocket to fly the camera in. Appropriately named "Aiptek Mini PenCam 1.3 Rocket" I found parts & fin cans from a couple of Estes Eliminator and OOP Longshot kits and some lengths of Semroc series 13 tubing.
The parts I selected stacked up to be an Estes Longshot only with Estes & some additional Semroc parts including a Mars Lander nose cone - a short length of Semroc ST-16, and the short Semroc BR-1316 transition. Although it wasn't my intention, after looking at it in RockSim I realized the capsule somewhat resembled the old Estes Camroc.
My main design goal for this project was quick assembly with the plastic fin cans and to get the camera in the air and launch it tomorrow, but the weather is flaring up again. I have since abandoned this design although someone else on the forum may have interest in it.
Diameter: 1.64" (ST-16)
Fin Span: 5.716"
Weight (with camera): 8.21 oz
Weight (without camers): 5.76 oz
New Plan -- Rogue Star
This is a bit tricky to describe, as once again RockSim gets in the way of doing what I want to do visually. Rogue Star is 18mm powered, and qualifies as an upper-end VR-Class bird on "C" power. There are some features that the 3D image just cannot show:
1. The pods use the SST: Shuttle-1 engine tube nose and tail cone set.
2. The four fins at the rear of the ST-13 tube really belong on the ST-5 pods, 2 each, angled outbound 45 degrees above and below the horizontal. Think Estes Titan-III stabilizing fins here.
3. The cockpit canopy is also from the SST: Shuttle-1 mothership.
4. The forward end of the ST-13 should be cut with a "French Curve" styling, such that the 'forward protrusion' occurs just behind the canopy. Think of a sine wave curve, but only using half of the curve. The 'hump' of the curve points forward, on the top side of the modle, and the straight edge falls to the bottom of the model.
Diameter: 1.34" (ST-13)
Fin Span: 6.34"
Weight: 1.82 oz
A8-3......130'......Dv 21 FPS......requires 33"
B4-4......320'......Dv 19 FPS......requires 27"
B6-4......330'......Dv 14 FPS......requires 28"
C6-5......710'......Dv 20 FPS......requires 28"
A cutting pattern still needs to be drawn out for the ST-13. Obviously, there are other details that could be added by the builder, and a good decal set could go a long way toward trimming it out.
New Plan -- 24mm AstroVision Booster
Got one of these in working order today, after picking up a dud yesterday. I wanted to see if I could come up with a better booster that would give some real performance, or at least gain some substantial altitude, compared to the booster you get with the camera. This first version is a throw-together, what-if type of design, and I'm just guessing about the actual weight of the camera. I have not yet weighed the payload to get an accurate value, but I'm guessing no more than 2.5 oz. It really doesn't feel that heavy, maybe just a little more than a hollow plastic NC of the same size.
The camera shoulder loose-fits into a standard ST-13 tube, so that's where I'm starting from. Other variations of this theme are coming, so this is just a beginning baseline.
Diameter: 1.34 (ST-13)
Fin Span: 4.84"
Weight: 3.31 oz (Camera estimated at 2.5 oz)
D12-5......1015'......Dv 26 FPS......48" x 3/16" Rod
Takes about 7.2 seconds to reach apogee, so the 12-18 seconds of record time should be enough to get a flight video.
I really like the booster and your choice of fin design. Looks great!
There is however a limitation that I haven't been able to figure out in RockSim that is throwing your margin of stability out. Margin without engines in RockSim shows 32.28 & I think it's probably closer to 6.43
RockSim is throwing it out somewhere in your Nose Cone Tip, Transition or Fin used for the camera shroud estimation.
To determine this I eliminated those three items from the design file and replaced those items with a single ogive BC-12561 Semroc cone, same as used on the SLS Javelin. I then added a single mass object to the true CG of the Semroc cone at 4.595" to bring the total rocket weight to 3.3085 to match your designs weight and I get a 6.43 margin without engines.
RockSim just doesn't estimate the CG accurately in this case (and I'm not sure why it doesn't).
Jay Goemmer emailed me with the heads-up. Change the setting on the first tab "Rocket Design Attributes" where it says "Static Margin Reference" from the default setting of "Nose Cone Base Diameter" to "Maximum Frontal Diameter". Everything else being equal, this should bring a loaded margin (with a D12-5) to about 5. The base diameter of the nose cone is actually larger in this case than the body tube, which is what RockSim normally defaults to. Empty margin comes to 8.
Jay put this info in another thread not too long ago, and I just forgot to make this change. I used his NC drawing method to produce the AV shape.
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