FR-4 is a fire-retardant G glass-epoxy laminate that is used primarily in the printed circuit board industry. The thing I like about cutting it is that it smells like a circuit board. I guess I have made that same assumption as well.
I know it has fiberglass and epoxy and the best way I found to cut that is with the diamond bits. BTW, they work very well on carbon products too. Also, typically G10 circuit board material at least is compressed during layup with several thousand PSI of pressure.
G10 is a rating of the glass its strength and temperature abillities. So all the above can be G10 or other ratings dependant on the materials used. Normally G10 is tougher and has higher heat abillities. Its also harder to cut drill and ect. Thanks, guys! Doug both you and Chris LaPanze mentioned the right diamond cutting wheels for fiberglass.
Thanks Matt. Last edited: Sep 30, Joined Jan 19, Messages 14, Reaction score They have Carbon Fiber tubing. Joined Jun 17, Messages 5, Reaction score 1, Also, where can you find a 29mm nose cone? CarVac Well-Known Member. Joined Feb 13, Messages 5, Reaction score This I'm sure about: G10 fiberglass tubing is wound cloth, and G12 is plain-filament wound.
I'm not sure whether that's actually true or not. In my rocket club's experience, G10 is much lighter than G12, but much less tough; we've had it split open by a blue tube coupler before. On the other hand, drilling holes in filament-wound tube has been known to weaken it significantly. If you want your rocket to truly "disappear" on the H, you might not want to use these products, since they're probably much stronger and heavier than you need.
Regarding nosecones: Shockwave has fiberglass ones that fit the thicker HPR style tubing nicely. CCotner Well-Known Member. Joined Sep 4, Messages Reaction score 2. Shockwave makes nominally nice 29mm fiberglass cones. I've had mixed luck-they're either near perfect 2-part mold cones no plaster top coat like the old PR and wildman cones, fiberglass right at the surface , or they're terrible-completely out of round and misshapen.
CarVac got that one replaced for free, though. The cones are a little bit on the heavy side but you will never be able to break it. I don't know that their CF tubing is; I've seen performance rocketry carbon fiber tubing that was wrapped-fabric style and also seen some that was filament-wound style. Either way, for a 29mm MD, it's probably unnecessarily strong.
The colored tubing and profusion tubing are identical to the G12 tubing in construction style; they're all filament-wound fiberglass at something like a 60 degree wind angle. Far from ideal, thick-walled tube, totally indestructible. The colored ones have pigment in the epoxy matrix, the profusion ones have powdered graphite to make the tube look like CF and also to add a modicum of strength.
I don't know if the profusion tube has enough graphite to inhibit radio and GPS. The G10 tubing is fabric-wrapped fiberglass. It's lighter than the filament-wound tube and almost as strong in lab tests-but it fails more readily in the field.
A friend lake staked a rocket that had a blue-tube coupler and a G10 fiberglass tube in front of that, and the blue-tube coupler split the fiberglass tube down the middle and barely got scratched in the process.
You want something light and stiff for this. If you don't want to make your own tube which is what I'd recommend, all the commercial tubes will have thicker-than-necessary walls , I'd order the plain G12 or Hawk Mountain G The Hawk Mountain tubing is a little lighter and a little thinner-walled, and is stiffer but more brittle. At this size, the brittleness almost certainly won't matter. Or, get a thin-walled paper tube for a motor mount , and put wraps of carbon fiber around it, wrapped under tension, and you'll be in even better shape.
You can tell we're both having trouble focusing on homework today. CCotner said:. FFFF 2. Tripoli vs. NAR vs. Pro38 vs. Kosdon vs. Ellis Mountain? Fill n Finish vs Dope vs Kilz 5. Newtons vs fig newtons vs pounds of thrust 6. RATTWorks vs. Hypertek vs. AT Hybrid systems 7. G75 vs H vs Certification 8.
Sweet Vee on 32MM G12 Dremel vs Wizard vs Ryobi vs Craftsman Dremel vs Ryobi vs Craftsman vs Wizard who???? HPR vs.
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