First post here...
I recently got into road cycling after the urge to try something different. I've only been riding on and off since October (lately not as much) but did pickup a used kurt kinetic road machine off craigslist and plan on sticking primarily to indoor training this winter. I like the trainer a lot but after seeing the Rock n' roll addon for it, it got me thinking why couldn't i do something like this?
After a quick search, I came across a short clip of someone who apparently had a similar idea:
I've tried emailing the guy but his mailbox is full. I even went as far to email general info for the website he works for with no avail. It doesn't look like this went any further than a concept but looks fairly easy to do with minimal parts to buy.
From what I gather, He's got the board resting on a couple of U-bolts to provide the smooth side to side movement and then attached a few springs for resistance. It's hard to tell how many or where they are located but it seems like they are probably towards the middle and my guess would be 4 total springs. Other than some way to secure the trainer to the top of this platform, that seems to be the extent of it.
I'm a big hands on person and think this would be a great project to take on if nothing else but for the experience. However, I would like to try and give it some realistic resistance so that I'm not stuggling to stay balanced in the center or fighting with the bike to try and move side to side and I've got no idea where to start in terms of figuring out just what sort of compression springs i should use or if there's even a better method. Mcmaster.com has tons of springs to choose from.
I've thought about some improvements that could be made to this design as well-
-perhaps using ball bearings on a central shaft vs. resting the platform on U bolts. However, i think for the simplicity and relatively small amount of movement side to side, I don't know if there would be a major advantage
-Also, I've been thinking that perhaps using gas struts would provide
a potentially stronger and more rigid yet still realistic platform. This could also be potentially cheaper than the springs depending on what amount of force is necessary...
What I could use some help in is determining first of all how to even go about estimating the forces (centripetal?) that are induced in cycling and then how they can be recreated using either of the methods listed above. Any good mechies out there care to chime in? Any help/advice would be appreciated!