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Showing results for tags 'crossbow'.
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This is a MOC I created first in LDD, then in real life (thanks BrickLink!), featuring four attractions at a Renaissance Faire/Festival. I wasn't sure whether to post it in this forum or City (since technically it would take place in modern times), but figured its elements would appeal more to Historic fans. You can find many more pictures on my Flickr page. Also, I have submitted this as a project on Lego Ideas, so if you feel so inclined, I'd love your support: https://ideas.lego.com/projects/131376 C&C are always welcome and appreciated! Thanks, Lindulan Overview of the whole group: 1 - Renaissance Faire by Lindulan Halcyon, on Flickr The concession stand, with half-yards of lemonade and smoked turkey legs: 2 - Concession stand by Lindulan Halcyon, on Flickr The stage, where a minstrel plays his lute: 4 - Stage by Lindulan Halcyon, on Flickr Shooting gallery with stud-shooting crossbow: 5 - Shooting gallery by Lindulan Halcyon, on Flickr Souvenir tent with removable roof and lift-up side flaps: 7 - Souvenir tent & roof by Lindulan Halcyon, on Flickr
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I always loved lego creations that shoot things, especially crossbows. Unfortunately, the bricks are not so ellastic, so some power source is needed. I decided to use stiff string, as opposed to common ruberbands. Instead, the limbs are moved by steel springs. Reverse draw crossbow by David_Z1, on Flickr This is how it looks unloaded: Crossbow - up1 by David_Z1, on Flickr and here loaded: Crossbow - up2 by David_Z1, on Flickr The limbs are not moving that much, but the draw length is quite long due to the compound system. This has few advantages: -The peak string velocity is 3x the limb velocity -Bolt acceleration is smoother -For the given draw length, limbs can be shorter = stronger and with less inertia. The springs are stretched a lot even in the idle position. Thanks to this, the string force ramps up from 0.6 kg to about 1 kg, greatly increasing energy as compared to going from zero. Moreover, the construction is stiffer this way. The aim of reverse draw construction was to shorten the limbs and move them to the rear, improving balance. The limb movement is synchonised (two grey beams on the front), and the spring tension is regulated (suprisingly, two identical springs were not-so-identical, so this was mandatory). Trigger system: Crossbow - trigger mechanism by David_Z1, on Flickr This is a typical crossbow trigger. After pressing it, the white knob is free to rotate, releasing the string with little friction. The knob can rotate backwards, so that the string can be hooked up by just pulling it over the knob. Okay, for the performance: bolt velocity 20 m/s (about 66 fps). Not exactly blazing fast, but the ammo is quite heavy and stable in flight. The hit effects are usually like this: Penetration test by David_Z1, on Flickr I'd still call it a toy, it is no real danger unless someone is shot in the eye (obviously). Hitting anything beyond 20 m or so is very hard. One can also load lighter ammo such as pencil to reach some 35 m/s, but accuracy becomes terrible. -
So after a few month pause away from LEGO, instead focusing on my electric skateboard, I'm back with a new powerful creation. This crossbow only took a few hours to construct and is a ton of fun. It shoots anything that is 1 stud wide and 1 stud high. This crossbow is immensely powerful, packing quite a punch; if you do try to recreate one, use common sense and don't shoot living things. It uses one long rubber band to propel the projectiles and it has a 32 stud draw. It has simple iron sights and it's rather accurate plus it has a crazy long range, I shot it straight up from my balcony and it went out of sight. I calculated the speed of the projectile to be 80km/h, and no I'm not lying, the calculations are in the video. Here is a terrible picture of a little doohickey being shot. I hope you guys liked my crossbow, any feedback would be appreciated.
