Design of a snowbike

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Design of a snowbike

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Design of a snowbike

  1. 1. Design of a Snow Bike
  2. 2. Initial Plan <ul><li>Build a water bike </li></ul><ul><li>Able to float and safely propel a person on the water </li></ul><ul><li>Scratched the idea, already in commercial production </li></ul>www. Shuttlebike.com Seacycle or Water bike www.Nauticleniche.com
  3. 3. Evolution of the Plan <ul><li>Work with a bike or some form of human power. </li></ul><ul><li>Researched Snow bikes </li></ul>www.winterxbike.com <ul><li>No cross country bikes currently in production </li></ul>
  4. 4. Why a Snow Bike? <ul><li>No cross country human powered snow vehicles currently in production </li></ul><ul><li>Cross country skis are the only competition </li></ul><ul><li>Bike enthusiasts will not have to put expensive bikes in storage over the winter months </li></ul>
  5. 5. Design Requirements <ul><li>Gain traction in moderate to deep snow </li></ul><ul><li>Hold up to a 220lb person </li></ul><ul><li>Attach to a standard stiff back mountain bike </li></ul><ul><li>Not fail in cold weather </li></ul><ul><li>Made affordable using some off the shelf parts </li></ul>
  6. 6. Speed in the Snow
  7. 7. Data obtained from: Bicycling Science, by Frank Rowland Whitt
  8. 8. Stability in the Snow <ul><li>Gyroscopic motion does not contribute </li></ul><ul><li>Centripetal motion gives inline vehicles the ability to lean without falling over </li></ul><ul><li>Constant corrections account for Stability </li></ul><ul><li>Trailing wheel is more stable </li></ul><ul><li>Shimmy effect due to joint imperfections </li></ul>
  9. 9. Surface Area Estimations <ul><li>Should compare to snowshoe or snowmobile surface area </li></ul><ul><li>Large snowshoe, approx. 1psi on snow </li></ul><ul><li>Average snowmobile, .5 psi on snow </li></ul><ul><li>Bike + Human weight = 260lbs (max.) </li></ul><ul><li>Need between 260 and 520 in 2 surface area </li></ul>www.atlassnowshoes.com www.ski-doo.com
  10. 10. Concepts Steering Drive 2 Skis Large Board Dual drive wheels (Tricycle) Paddle wheel
  11. 11. Final Design Concept Ski Steering Track Drive
  12. 12. Connection Points Aluminum clamps attach permanently to frame Extended Rear wheel hub will hold sprockets on the outside of the track
  13. 13. Key off the shelf components <ul><li>Track from Arctic Cat ZR120 </li></ul><ul><li>ZR120 drive sprockets </li></ul><ul><li>ZR120 idler wheels </li></ul><ul><li>Snow lubricates drive gears and sliders </li></ul><ul><li>Plastic gears are light weight </li></ul>$250 $90 $30
  14. 14. Prototype Design <ul><li>Use to test what the surface area of the drive system needs to be </li></ul><ul><li>Test a concept </li></ul>
  15. 15. Future Goals <ul><li>Design and build a track system using some off the shelf parts </li></ul><ul><li>Design and build a ski steering system </li></ul><ul><li>Test in varying snow conditions </li></ul>
  16. 16. Acknowledgements <ul><li>Prof. Keat </li></ul><ul><li>All Seasons Equipment inc. 60 Freeman’s Bridge rd. Scotia </li></ul><ul><li>Freeman’s Bridge Sports inc. 38 Freeman’s Bridge rd. Scotia </li></ul><ul><li>Jim Howard and Roland in the Machine Shop </li></ul>
  17. 17. Questions ?

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