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Originally Posted by MichaelW
(Post 16220401)
"Look" made a solid adjustable stem.
I'll take some pictures of the drivetrain this weekend and post so you all have a better idea of how this thing is built. BTW - We shot at the World Championships of Punkin Chunkin last weekend and won with a shot 1776' (a world record for a human powered centrifugal machine). Looking to glean as much as I can from everybody here and improve for next year. So thank you all for your input! |
Originally Posted by kckulp
(Post 16220964)
This was my first week on the machine. The bike is too small, cheap and not sized correctly so my technique is agreeably not what it should be. My cadnence was also not ideal. This is not like riding an ordinary bike, so it takes some getting used to. There's a HUGE dead zone at the top and bottom of the stroke especially at the low range. I am a solid B/B+ rider and competitive triathlete. Surprised you can diagnose my fitness level from that clip.
The shot in the clip was a ramp up to a target RPM, not a timed shot. Don't know the answer how much power it takes to spin up. We're curious about that and are hoping to add a power meter to the system (bottom bracket? Garmin Vector pedals?). Currently only using a cycling computer w a magnet on the main wheel to read rpms. Last year the builder left the front suspension on the MTB. We convinced him to lock it out for this year. Will engineer some type of a fix for the front end. I think looking at the transmission, then, should take precedence over all else, since you're losing a huge amount of power in those dead zones. Next, I'd focus on cadence and power, and then start looking at the bike. I really believe that for 2mins of riding, the bike won't make any difference, provided you're getting the leg extension you need and have room jump out of the saddle for the last 10-20 seconds during the sprint. I am, clearly, assuming that maximizing flywheel velocity is the goal; is that correct? |
Originally Posted by kckulp
(Post 16221003)
BTW - We shot at the World Championships of Punkin Chunkin last weekend and won with a shot 1776' (a world record for a human powered centrifugal machine). Looking to glean as much as I can from everybody here and improve for next year. So thank you all for your input!
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@chaadster Not a problem.
Originally Posted by chaadster
(Post 16221080)
maximizing flywheel velocity is the goal; is that correct?
You are correct. Max out the RPM's. We have not passed 300 RPM with current setup but believe its easily obtainable. Still addressing efficiency (trying to remain topical), suggestions for a new drivetrain? What options should we look at? I will admit that I'm weak on the math here. Suggestions for a rear cassette set-up? Should we consider a big 55+T ring up front? Triple crankset? |
Originally Posted by kckulp
(Post 16221791)
@chaadster Not a problem.
You are correct. Max out the RPM's. We have not passed 300 RPM with current setup but believe its easily obtainable. Still addressing efficiency (trying to remain topical), suggestions for a new drivetrain? What options should we look at? I will admit that I'm weak on the math here. Suggestions for a rear cassette set-up? Should we consider a big 55+T ring up front? Triple crankset? I how many gears are you using for a competition wind-up now? |
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