usapyro Posted January 9, 2012 Share Posted January 9, 2012 (edited) I have a hankering to build another one of these sometime. I really want to build an optimized one with around a 500-700' range and hurl 1-3Lb projectiles. Even been playing with the software to calculate out the proper design. I use to build these when I was around 14. I had one that could hurl 1lb pieces of 1.5" iron rod around 250'. About 450#'s of counterweight. Very inefficient beast. Anyone else here into Trebs? This seems like the best forum for this thread. Edited January 9, 2012 by usapyro Link to comment Share on other sites More sharing options...
Col Posted January 9, 2012 Share Posted January 9, 2012 I made a few for the kids, somewhere in the shed there`s a small FAT, two F2k trebs and an onager. Link to comment Share on other sites More sharing options...
Potassiumchlorate Posted January 9, 2012 Share Posted January 9, 2012 The idea has struck me. The Romans made them already 2000 years ago, and they were used in Medieval Europe. Link to comment Share on other sites More sharing options...
JFeve81 Posted January 9, 2012 Share Posted January 9, 2012 I'd like to build one but it would have to be small scale. No bigger then a standard table top. Link to comment Share on other sites More sharing options...
Col Posted January 10, 2012 Share Posted January 10, 2012 (edited) A small Fat (Falling Arm Treb) is quite easy to make, iirc the one in the shed is about 15" long x 8" wide x 20" high so it`ll sit on a table. You can`t use it indoors as it chucks golfballs a good 100ft with a few lbs of counterweight. I`ll see if i can dig it out and snap a pic. Edited January 10, 2012 by Col Link to comment Share on other sites More sharing options...
dagabu Posted January 10, 2012 Share Posted January 10, 2012 I have a FAT that is 48" tall and has a 50# lead slab for the counterweight. The arm could be better but it throws well. We use it to throw apples at targets at Halloween. Painted the ugliest shade of blue you ever saw though... -dag Link to comment Share on other sites More sharing options...
madmandotcom Posted January 10, 2012 Share Posted January 10, 2012 a way of avoiding carrying heavy weights is to attach rockets to the platform to fire when you wish to launch the payload Link to comment Share on other sites More sharing options...
Mumbles Posted January 10, 2012 Share Posted January 10, 2012 And you still can't understand why everyone thinks you're unintelligent? Link to comment Share on other sites More sharing options...
dagabu Posted January 10, 2012 Share Posted January 10, 2012 a way of avoiding carrying heavy weights is to attach rockets to the platform to fire when you wish to launch the payload Have you though through the implications before you posted that? What happens once the arm reaches the end of its stroke? If you had instead though about a piston and sleeve, black powder powered, your'e idea would have had some merit but to suggest a Wiley Coyote, pull it out of your bum idea and then post it as if it were an actual thought out idea is foolish. -dag Link to comment Share on other sites More sharing options...
Potassiumchlorate Posted January 10, 2012 Share Posted January 10, 2012 I was out in the woods before, and I saw a troll. Link to comment Share on other sites More sharing options...
Col Posted January 11, 2012 Share Posted January 11, 2012 (edited) rocks are cheaper than rockets and they`re reusable If you don`t want to carry weights around.. use it in a quarry (plenty of rocks around) or use it near a lake and use a counterweight box that can hold water..don`t forget to take a bucket Edited January 11, 2012 by Col Link to comment Share on other sites More sharing options...
usapyro Posted January 11, 2012 Author Share Posted January 11, 2012 I actually created a wooden bucket just for rocks. You have to make sure it can't swing into the sides or twist so it has to be custom built for the Treb. To boost the counterweight chains were used. Link to comment Share on other sites More sharing options...
madmandotcom Posted January 12, 2012 Share Posted January 12, 2012 (edited) What happens once the arm reaches the end of its stroke? If you had instead though about a piston and sleeve, black powder powered, your'e idea would have had some merit you just need to either put in an aqua deccalerator or regulate the size of the rocketsand mr coyote would probably attach the rockets to himself Edited January 12, 2012 by madmandotcom Link to comment Share on other sites More sharing options...
dagabu Posted January 12, 2012 Share Posted January 12, 2012 (edited) you just need to either put in an aqua deccalerator or regulate the size of the rocketsand mr coyote would probably attach the rockets to himself Ahhhhhhhh, yes. Stick the whole thing in a lake. Question: Why would limiting the size of the rocket matter? Now, before answering, think about it all the way through and then answer. Yes, Wiley E. Coyote would in fact attach them to himself, the result would, I am afraid, be the same as your idea but you are indeed not a cartoon. -dag Edited January 12, 2012 by dagabu Link to comment Share on other sites More sharing options...
Col Posted January 12, 2012 Share Posted January 12, 2012 Sounds very inefficient. A treb throwing arm should (ideally) stop abruptly just as the projectile leaves the sling, the idea is to transfer all the energy from the arm to the projectile at the point of release. Tuning a normal treb can be tricky, a rocket treb would be a nightmare Link to comment Share on other sites More sharing options...
madmandotcom Posted January 13, 2012 Share Posted January 13, 2012 the reason the size of the rockets has a part in the issue is because a 1 oz rocket will have a different burn time than that of a 1 lb rocketalso, you do not need a lake just a bucket Link to comment Share on other sites More sharing options...
Col Posted January 13, 2012 Share Posted January 13, 2012 like i said..a nightmare to tune Link to comment Share on other sites More sharing options...
dagabu Posted January 13, 2012 Share Posted January 13, 2012 the reason the size of the rockets has a part in the issue is because a 1 oz rocket will have a different burn time than that of a 1 lb rocketalso, you do not need a lake just a bucket Really? How so? Please defend your statement of a 1oz rocket having a different burn time as a #1 rocket. Thrust, yes but I have 10mm rocket that has exactly the same burn/delay/burst time as my #3 rockets. A bucket? Again... Really? And how would that work? Hypothetically, I could get my Unicorn to pull a rainbow tied to the swing-arm and launch a comet to Uranus.... Just saying. -dag Link to comment Share on other sites More sharing options...
dan999ification Posted January 13, 2012 Share Posted January 13, 2012 i hope the comet is a boot...iful one. dan. Link to comment Share on other sites More sharing options...
madmandotcom Posted January 14, 2012 Share Posted January 14, 2012 Really? How so? Please defend your statement of a 1oz rocket having a different burn time as a #1 rocket. Thrust, yes but I have 10mm rocket that has exactly the same burn/delay/burst time as my #3 rockets. A bucket? Again... Really? And how would that work? Hypothetically, I could get my Unicorn to pull a rainbow tied to the swing-arm and launch a comet to Uranus.... Just saying. -dag do those two rockets use the same fuel, are they both the same type-ones not an end burner and the other a core burner- also the specifications of the rockets can also affect the burn time, as a short and fat one will flash through the fuel grain quicker than a long skinny one no matter what the weightfilling the bucket with water will cause the rocket to slow as the density of water is different from that of airunicorns are mythical creatures and rainbows are purely light with no physical mass therefore your suggestion is impossible, you could however, hypothetically speaking, swap the rainbow with rope and the unicorn with a team of horses, if it was a big enough swing arm, it would be theoretically plausible Link to comment Share on other sites More sharing options...
dagabu Posted January 14, 2012 Share Posted January 14, 2012 unicorns are mythical creatures and rainbows are purely light with no physical mass therefore your suggestion is impossible Too easy, way too easy! Yes, mythical and impossible but no more a fairy-tail then the dribble about a rocket and a bucket of water. -dag Link to comment Share on other sites More sharing options...
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