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copria
Starting Member

USA
21 Posts

Posted - 12/16/2012 :  13:28:00  Show Profile  Reply with Quote
This year the K-State team has decided on rear wheel drive.

We have consulted Chapter 4: Power and Speed in "Bicycle Science" by David Wilson and Sheldon Brown's webpage on Gears and Drivetrains http://sheldonbrown.com/gearing/index.html. Are there other significant resources for drivetrain design?

Thanks

John Opsahl

Edited by - copria on 12/16/2012 13:28:50

copria
Starting Member

USA
21 Posts

Posted - 04/30/2013 :  11:59:50  Show Profile  Reply with Quote
I created rough excel spreadsheets for determining gain ratio and theoretical top speed. Email me at john.opsahl1@gmail.com if you want the files and an explanation on how to use them.

Analytical cycling is also a great place to start: http://www.analyticcycling.com/

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W Hilgenberg
recumbent enthusiast

USA
286 Posts

Posted - 07/26/2013 :  22:43:35  Show Profile  Reply with Quote
Hey there,

For the Poly team, we usually reference "Bicycling Science" as a starting point if we are going to pursue the analysis for certain drivetrain configurations. From there we use resources such as Shigley's "Mechanical Engineering Design" on how to calculate the decrease in efficiency with each additional component.

A good rule of thumb as far as design is concerned is that if you are ever going to do something more than once, then you should write a program for it to save time later. We also have written up an excel sheet for final drive ratios as well as vehicle speed and rider cadence for a given ratio and speed. Sheldon brown has a good calculator for this as well if you don't feel like writing one but it doesn't take into account a middrive.

As far as overall configuration is concerned, take a look around you at what has been successful in the past at the competition as well as what the general recumbent market has done for efficiency. This will point you in the correct direction for future development.
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copria
Starting Member

USA
21 Posts

Posted - 08/04/2013 :  16:29:41  Show Profile  Reply with Quote
I have posted all our team's drivetrain information for upload.

Start with the HPV Drivetrain word document. Enjoy

https://mega.co.nz/#F!zYUAmKyA!LS0-F3bBCg1BeGTCOGD94g
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