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REV 2.4 - Tue May 31 06:02:52 2011

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Model Minutes
G-75 Carrier
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SPECS: 20" x 2" - oz
ROCKSIM FILE: MISSING - please submit here
SpaceCAD FILE: MISSING - please submit here
REC'D MOTORS: B6-2, C6-3

Rating
(Contributed - by Chan Stevens [Who's Who Page] - 2/04)

Model Minutes G-75 CarrierBrief:
Want a cheap venture into space? Try this paper rocket complete with payload bay. If you've never built a paper rocket though, this is not the kit to start with as there are numerous intricate cuts and folds, 3 shrouds, and a paper nose cone.

Construction:
Components are--paper! OK, the fins are actually cut from foam board, the engine hook is metal, and there's a bit of clay nose weight, but everything else is pre-printed highly quality color patterns to cut and fold. Recovery is via a 9" mylar chute, with shroud lines that are terribly undersized (less than 6"), and attached to a rubber band shock cord. I upgraded mine to 3/8" elastic from my spare parts box.

In order to take advantage of the very nice 3-D photos in the instructions, you must first build a pair of 3-D goggles (red film on one side, blue film on the other). I personally found this a bit hokey and the images aren't too clear under fluorescent light, but the photos are quite helpful, especially where I struggled to understand the instructions which had been translated from French.

Construction begins with a massive cut/form/glue festival, making the 3 body tubes, 3 shrouds, and nose cone. The main shroud is actually two separate inner/outer pieces bonded together for reinforcement. There are also a variety of rings that must be cut out of paper, bonded to foam, then cut out of the foam. My foam had been dented, most likely in storage, but it didn't look like it would jeopardize the flight. Make sure you have a very sharp knife for cutting the foam, as even my fairly new utility knife blade had a tendency to leave a slightly jagged edge to the foam. When I switched to an "extra sharp" X-Acto blade, I got very crisp, smooth edges. Also, white glue works best on the paper tubes and transitions, drying clear and leaving more of a "rolled" edge than yellow glue.

One tip on the main body tube: cut out the fin slots BEFORE rolling the tube rather than waiting until the directions call for this. You'll save yourself a lot of hassle, potential tearing, and get a much better finish.

The construction now moves to modular stages, adding centering rings/reinforcements to the body tubes. Clay weight is added to the nose, then sealed in by two pieces of foam block, which act as the nose cone shoulder.

The motor mount assembly consists of a rolled paper tube, engine hook, and foam centering rings. It glues into the bottom of the main body tube.

The body tubes and transitions are now glued together (separation is at the nose cone), and then the fins are attached. When they guys at the pad start making fun of you for flying a paper rocket, remind them that your paper rocket has through-the-wall fins! This is one durable paper tiger.

I completely upgraded the recovery. As noted earlier, the materials are a bit weak and the mounting is through a sliphole in one of the paper centering rings. I used a tri-fold mount and elastic, much like standard Estes kits. I also went with one of my spare 12" chutes with more generous 15" shroud lines.

Finishing:
As the patterns were all pre-printed, there's no finishing necessary for this. The instructions suggest a Mud-pudge clear coat, which I've never heard of, so I stuck with the untreated finish.

Construction Rating: 3 ½ out of 5

Flight:
First flight was with no wind, freezing temps, and clear skies on an Estes C6-5. The flight was perfectly straight, though spinning (probably due to the bent foam fins). Very impressive for a paper rocket!

Deployment was a bit after apogee and resulted in a violent separation at the paper transition joint. Even on just this one flight there's evidence of burn marks on the inside.

Recovery:
As noted, the recovery provided for this rocket is weak and most builders will want to upgrade it.

Flight Rating: 4 out of 5

Summary:
Very impressive design and appearance for a paper rocket. It will hold its own against most commercial kits out there.

Overall Rating: 4 out of 5

[Submit your Opinion]

GUEST's OPINION:
06/09 - "I'm almost done with this build and am not impressed except for the outstanding "pre-printed graphics" on body parts. It was very hard to assemble, line up body tubes, etc. Besides needing a bigger shock cord and chute, you finish it with "modge podge hard case." This will harden up and make it more durable. I will post an up date after its first launch. It's no wonder these paper rockets are such a hard sell." (G.A.R.)

GUEST's OPINION:
02/04 - "We are so sorry about the shroud line because the real length is 12". W we have found two 6" from the Flying Spider mix with the 12" for G75 (Murphy’s law?). We are sure you can understand our bad feelings. For the shock cord, we will work to find a new material." (ModelMinutes)

[Enter Rocket Specific Tip]

SPECIFIC ROCKET TIP:
05/04 - "I believe the sealing material being referred to is: Mod-Podge http://www.plaidonline.com/apMP.asp You should be able to find this stuff at an arts&crafts store." (N.K. )

[Enter Flight Log]
Date Name Motor Ejection/
Altitude
Wind Notes
05-01-2005 Clive Davis Est SU B6-4 Apogee - Perfect 5-10 mph winds - The boost was perfect. Straight. Picture perfect. Shock cord failure w/nose cone & streamer tumbling down on their own while the main body did a Peter Alway backslider recovery. Very cool. Maybe I will always have it recover this way.
05-01-2005 Clive Davis Est SU B6-4 Apogee - Perfect 5-10 mph winds - The boost was perfect. Straight. Picture perfect. Shock cord with nose cone and streamer went tumbling down on their own while the main body did a Peter Alway backslider recovery. Very cool. Maybe I will alway have it recover this way.
08-27-2005 Clive Davis Est SU B6-4 Apogee - NC Down 5-10 mph winds Event: ASTRE Sport Launch
- Nose cone came down with streamer, body tube did a lawn dart. It will require repairs, but the Carrier will fly again some day.
01-31-2004 Chan Stevens Est SU C6-5 Apogee - NC Up Calm - Chute sep.

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