Recent content by murmur

This is the answer; When the crank (or rather the extension of the crank's axis out to the pedal's lateral location) moves toward the hip joint during the power stroke, with the force provided by the leg being unchanged (as when the crank wasn't moving toward the hip) then the leg is providing...

Fantastic! PMs sent. Dave

I want to retrofit my Silvio 2.2 with a V20 chainstay, prior to the V20c. These chainstays mount to the BB shell inside of the bearing cups, not to the cups themselves. I need the regular (19.6") length. Anybody have one they want to sell?

Oh, I get it now. But... the geometry of the S30 makes it look more like 10-degrees-outward pedaling force would be needed to keep from turning the boom. Sounds kind of knee-ligament-intensive, i.e. not for those of us whose knee ligaments are already dealing with a lack of stability in the joint.

I'd still like to understand the fabled no-hands Cruzbike technique. I mean, without simplifying it too much: - Foot push on pedal, only one side. - Bar/Boom/Crank/FrontWheel turn - How to stop turn? Hands. Wait, I bet I know. Only do downhill rides. You can stop pedaling, and everything goes...

I don't think the energy from the wobble is *lost*. Where would it go? If you're doing the wobble correctly, it's going to propel you and the bike. Haven't we been through this already? If you're doing the wobble wrong, I doubt severely if your arms are seeing any more energy expenditure than...

I think you mean intersection.

Can you point me to that NASA analysis? So far I've only seen studies that say there IS a measurable dependence of power capability on hip angle.

Me too, I've even made some "adapters" for my Magnalock pedals so I can move the pedal backward on my foot and still have some positive position control. Right now I'm about an inch aft of the "conventional" position but I plan to go further back before long.

Serpentine isn't for the long haul, as far as I can tell. It's only for low speeds, which is ok for us recumbents since sprinting isn't something we do a lot of. In cardio-limited situations, serpentine isn't going to gain you much, but otherwise it's a free increase in recruitable muscle mass...

Osiris, 327 watts to do 24.7 mph on a V20? Doesn't square with Larry's 203 watts (all day long) for his 25.05 mph century record in 2015. Being small and having a rear disc wheel and front three-spoke... and maybe better tires... helps. But not by 38%. Even if his meter was reading 17 watts low...

trplay, while you're getting the video ready on the Hoochie Coochie Swivel, I'll just mention that the standard MBB serpentine mode will get you 12.34632% more power, but it will take ±9.04 degrees of steering travel. That means managing somewhere close to ±6" of lateral front-end travel for...

wow, things are going to be ok, trplay. Sometimes things just look bleak, right? I get it. Not much you can do but ride it out. Tomorrow's another day.

I don't quite understand rollers as they're currently marketed, but it seems like they would be the best way to understand the power implications of this "phenomenon". There are some rollers that have variable-drag mechanisms; are there any that claim to do power measurement? Actually it doesn't...

We've been over aspects of this topic before, and I did some analysis (which Dr Parker said he largely agreed with) showing the level of steering movement you'd need in order to get 6.5% of your power from your upper body, given the sample, but representative, MBB bike geometry. It's plus and...