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147 topics in this forum

  1. 'Soarer' magazine archive 1 2 3

    • 41 replies
    • 8,592 views
  2. This Looks very Worrying 1 2 3 4 60

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    • 61,183 views
  3. CAA registration consultation 1 2 3 4 6

    • 110 replies
    • 3,734 views
  4. Inactivity report... 1 2 3 4 6

    • 102 replies
    • 5,155 views
  5. Model Flying and the National Trust 1 2 3 4 6

    • 100 replies
    • 11,516 views
  6. This still looks worrying 1 2 3 4

    • 60 replies
    • 4,800 views
  7. Nats 2013 1 2 3

    • 43 replies
    • 4,038 views
  8. Modelspot no more 1 2

    • 39 replies
    • 4,198 views
    • 30 replies
    • 2,891 views
  9. 2015 Kerry Glide-in. 1 2

    • 30 replies
    • 2,251 views
  10. Tom Wallace son of Stuart (Gromit) and Gill 1 2

    • 29 replies
    • 1,991 views
    • 25 replies
    • 4,388 views
  11. Radioglide 2013 1 2

    • 25 replies
    • 4,047 views
    • 23 replies
    • 2,012 views
  12. Lifetime Modelling 1 2

    • 23 replies
    • 4,356 views
  13. Forums closed for maintenance 1 2

    • 22 replies
    • 2,178 views
  14. HOBBYSTORES - Stores notice 1 2

    • 20 replies
    • 2,512 views
  15. BARCS Membership or Renewals

    • 19 replies
    • 1,316 views
  16. Robin Sleight

    • 18 replies
    • 1,284 views
  17. Airprox reports

    • 18 replies
    • 1,427 views
  18. In Memory of our Son Tom.

    • 17 replies
    • 2,973 views
  19. At last.....a glider with an ION drive has flown

    • 17 replies
    • 671 views
  20. MEMBERSHIP CHANGES

    • 16 replies
    • 1,058 views
  21. Leek Scale Fly In. 20/21st Aug.

    • 16 replies
    • 1,223 views
  22. Rod Potts

    • 15 replies
    • 810 views
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    • pete beadle
      Hi Marc and all, I'm hoping that I might be able to help at least a few of you guys who are just starting to use a bungee, by describing a few of the techniques that can be employed to make "marginal" power bungee systems work better in practice Firstly, wind, any wind, seriously improves the power available to be used on any launch. If you start using a bungee on a dead calm day you'll see this immediately Secondly, you'll find that, the more ooomph you can get into the first few feet of the launch, the fewer problems will appear as you start to really get into the climb Thirdly, the glider should be launched at roughly 45 degrees nose up, no more, and certainly no less, and you MUST launch squarely into wind ALWAYS.....every time Don't stand , ready to launch the end of the line, any more time than you absolutely have to.......holding the bungee at full stretch really kills it over time You can improve any launch by weaving on the line, but only after you are settled into the launch, at about a quarter of the way up, weaving stretches the line and improves the pull, especially if you feed some up elevator at the same time, but doesn't increase the total energy of the pull........that's simple Physics for you.......this is also known as "kiting" Gauging the moment of release at the top of the launch is important too, try to get off just before the model does it for you...... Towhook position is also critical and an ordinary cup hook is often better than the releasable type because it can be "tuned" by moving it forward or back depending on the conditions.....just drill holes in front and behind the starting position and move the cup hook either way as necessary Then there's CG position, the hook position must enable the glider to "cock" on the launch settling the glider's angle of climb to maximum effect I won't go into caring for the bungee rubber or repairing line breaks just here but, if anyone is in any doubt as to look after their bungee rubber, please post here and I'll try to answer what you want to know.....oh, and hand winches and power winches either...... they're quite complicated to get working at 100%....... Smooth, high launches and long flights chaps Regards Pete BARCS1702       
    • LEO THOMPSON
      Hi, I think we may have met at wormwood Scrubs last weekend.. I was flying my supra off the high start. (My favourite way to fly bar slope soaring) I got my 2 mtr class bungee from Seta tek in Germany as I have built his models and he sends a complete ready to use high start.  I purchased my 3mtr and above high start from the states, super nice quality components and you can specify exactly your requirements. see links below. http://www.seta-tech.de/ https://www.aerofoam.com/complete-3m-1.html best, Leo.  
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