Discussion in 'Army Reserve' started by davenport, Sep 1, 2009.

Welcome to the Army Rumour Service, ARRSE

The UK's largest and busiest UNofficial military website.

The heart of the site is the forum area, including:

  1. ive done a search but couldnt find anything...

    ive got a long tab coming up ive got a choice over which bergen to use, long or short?

    also any recommendations for weight and it's packing

  2. Fill it with steel ball bearings, they take the form of the bergan and distribute the weight evenly.

    You look like Lurch-longback
    You look like Frodo-shortback

    Edited to add- On the subject of weight, if you are going on a long tab you want as little as possible.
  3. Depends on how tall you are. Tall = long back and short = short back.

    Also, what Spaz said, if you're not going to fill it, don't bother with a long back. I've got an infantry bergan but can fit a weekend's worth of kit in my patrol sack. But if doing a war weekend, it means lugging everything around so gear your gear around the training.
  4. Depends which is bigger???
  5. one tip i like to give is that when starting the tab dont necessarily tighten up the skiny straps which pull the top of the pack towards into the shoulder straps. the reason i do this is initially then your waist will bear most of the weight then you can relieve them by yanking the straps tight after a while. this is something i do primarily just for CFTs and the like. over rough terrain probably wise to have it all tightened up for better control of the weight.

    just a thought, worth trying, may in fact be purely psychological but works for me, and a SAS bloke who showed me it.
  6. Wah!

    Both have the same volume - long is narrower, short is wider.
  7. Double Wah!

  8. thanks for that guys

    ive got a patrol bergen and an infantry one, im 5ft 10 so can see why the long bergen makes sense for someone taller but dont want my added weight to be jumpingaround all over the place even with sufficent padding! it's going to be 15kg over 10 mile.

    i train with a 30 litre black daysack stuffed full of clothing with added weight at the top, looks better than the long bergen as you do get a few strange looks running around with a bergen! 8O
  9. The bergan size is about your back size not your height.

    Your back size is approximately the same as the distance between your elbow and your fingertips, place your elbow on the seam where the lid is attached to the sack, lay your arm along the back of the bergan, your fingertips should be at the base,or thereabouts.

    If it is then its the right size back for you and will not push your beltkit into the small of your back.
  10. Got to ask, do you you use the same principle when trying on new clothes ?
  11. tut.. shouldve known better than to bother mentioning my source!
  12. Any type if you have one of these

    Big Dog — an infantryman's best friend
    Email articleComment on this articlePublished: 21 August 2009 12:30 PM
    Source: The Engineer Online

    Whether it's loping through the undergrowth, scrambling up snowy banks or skittering across the ice, Big Dog is an astonishing and somewhat unsettling sight.

    Developed for the US defence research agency DARPA by MIT spin-out Boston Dynamics, the four-legged robot has been designed to carry soldiers' equipment across terrain too rugged and difficult for existing tracked and wheeled vehicles.

    Around 1m tall and 1.1m long, the 109kg quadruped is able to stand, squat, crawl, trot, run (its current top speed is 7mph) and even bound. It has been tested in mud, snow and water, has carried a 154kg load and last summer it set a world record for legged vehicles when it completed a 12.8-mile, eight-hour hike without stopping or refueling.

    The power supply is a two-stroke internal combustion engine, the eerie whirring noise of which adds to the robot's air of menace. The engine drives a hydraulic pump that delivers oil through accumulators and other devices to the hydraulic leg actuators.

    Sensors on these actuators measure joint position and force, while around 50 sensors elsewhere in the robot measure the acceleration and attitude of the body.

    Along with visual data gathered by stereo cameras and a LIDAR system, this information is processed by an onboard computer that carefully coordinates the behaviour of the legs, giving the system stability on rough terrain and enabling reflex responses to external disturbances, that would otherwise tip the machine over.

    Boston Dynamics' Marc Raibert, who heads up the Big Dog team, explained that there are three ways to control the robot: 'An operator can drive it from a portable joystick. It can navigate using GPS waypoints, with a computer visual system used to avoid trees. Or, it can follow a human leader using a specialised visual tracking system. In all cases, the onboard computer and control system automatically do the walking and balancing, including dealing with local roughness of the terrain.'

    Although the company is now nearing the end of the funding for Big Dog, Raibert is hopeful over its chances to take the technology to the next level through DARPA's Legged Support System (LS3) project.

    The goal of this follow-up programme is to develop a legged system that can travel 20 miles and carry 180kg of payload in addition to its fuel payload.

    Planned improvements to Big Dog that could see it meet these requirements include a stronger mechanical design, the ability to right itself should it fall over, plus alternative power sources that would enable it to travel further and switch to a quieter operating mode if necessary. According to the company, this could make use of either a quieter four-stroke engine or a form of hybrid power system.

    Perhaps the team could draw on other DARPA-funded research into robot power systems. Robotics Technology is working on the EATR robot, a system that munches through biomass to make its own fuel. In response to tabloid stories about 'corpse-eating robots' the company stated that the robot is 'strictly vegetarian' — a relief to readers terrified by the thought of ravenous robo-dogs turning on humans.

    To see Boston Dynamics' Big Dog prototype in action on a variety of surfaces, click here:
  13. Well it would explain a lot :D
  14. As far as I can remember the long one is for those over 6' 2".
  15. I hear you brother, one tip i like to give is to put one foot in front of the other and keep walking until some uber tanned pti tells you to stop.

    Back to the bergan dilema, I wouldn't worry to much about long or short what's most important is colour?