New powermeter rumours
Moderator: robbosmans
+1.
Isn't this why Stages didn't release power meters for Campag and SRAM's carbon cranks?
Isn't this why Stages didn't release power meters for Campag and SRAM's carbon cranks?
SHUT UP LEGS
2015 Giant Propel Advanced
2015 Cannondale Supersix Evo
2013 KTM Strada mod. (totaled)
2011 Pinarello Dogma 60.1(loaner)
2011 Scott SUB 45(sold)
Politecnico di Milano Ingegneria Meccanica
2015 Giant Propel Advanced
2015 Cannondale Supersix Evo
2013 KTM Strada mod. (totaled)
2011 Pinarello Dogma 60.1(loaner)
2011 Scott SUB 45(sold)
Politecnico di Milano Ingegneria Meccanica
Correct.
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The crank doesn't need to have a linear stress-strain curve but as maquisard mentioned, you'd need more data points (i.e. known, varying weights hanged from the pedals) for the system to plot the curve, or an approximation of it.
Not mentioning the imperfections of glue jobs...
Sent from my iPhone using Tapatalk
Not mentioning the imperfections of glue jobs...
Sent from my iPhone using Tapatalk
SHUT UP LEGS
2015 Giant Propel Advanced
2015 Cannondale Supersix Evo
2013 KTM Strada mod. (totaled)
2011 Pinarello Dogma 60.1(loaner)
2011 Scott SUB 45(sold)
Politecnico di Milano Ingegneria Meccanica
2015 Giant Propel Advanced
2015 Cannondale Supersix Evo
2013 KTM Strada mod. (totaled)
2011 Pinarello Dogma 60.1(loaner)
2011 Scott SUB 45(sold)
Politecnico di Milano Ingegneria Meccanica
Their patent application, haven't had time to dissect it in detail yet.
http://www.freepatentsonline.com/20130333489.pdf
http://www.freepatentsonline.com/20130333489.pdf
I can tell from the patent that their product is aimed at Bicycle Raiders, I do hope that I qualify!
Looks like the patent application says it'll measure crank arm bending and twisting, have a temperature sensor and the last claim is "control unit preprogrammed for auto-calibration".
Perhaps they will measure various cranks and program the device for them.
Sounds like it could be good but it has to make it to market first.
Perhaps they will measure various cranks and program the device for them.
Sounds like it could be good but it has to make it to market first.
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What is it about this product specifically that makes it seem like "vapor ware?"
Is it the price point? The hand-wavy PR piece without real technical data? Is it just skepticism because it seems too easy? Or just because we're used to under delivery in this space (ie: brim brothers/garmin vector)?
Is it the price point? The hand-wavy PR piece without real technical data? Is it just skepticism because it seems too easy? Or just because we're used to under delivery in this space (ie: brim brothers/garmin vector)?
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kulivontot wrote:What is it about this product specifically that makes it seem like "vapor ware?"
Is it the price point? The hand-wavy PR piece without real technical data? Is it just skepticism because it seems too easy? Or just because we're used to under delivery in this space (ie: brim brothers/garmin vector)?
I think the following quote is pretty accurate.
DC Rainmaker wrote:Historically for companies those dreams have been dashed by the realities of bike distribution (costs associated with profits at each layer of the bike world), as well as the inability to get an accurate product. Every single person in the power meter industry will tell you that it’s easy to get 95% there, but it’s the last 5% of building a commercially available power meter (no matter the price) that spills the most blood for these companies.
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Marquisard is right. I work with strain gauges for a living. on human bone, which is ALOT harder to deal with than an engineering material. but the concept is similar
in addition to ensuring a good bond between the gauge and the material surface, proper alignment of the gauge is critical, too. a gauge even one degree off will give you vastly different readings from another gauge. If they work with rosettes, ( a network of 3 strain gauges) then it's easier as those aren't so sensitive to misalignment, but then you still have to take care to put in in the correct location. i.e. say 5cm from the pedal spindle. but then, the strain 5cm from a pedal spindle on a dura ace 7900 crank will be different than that compared to a campag record. even worse if you have other factors like decals, lacquer, crankskins, coming into play.
Wattteam is either doing LOTS of testing and have a very powerful algorithm taking all these into account...or their data simply isn't very accurate.
in addition to ensuring a good bond between the gauge and the material surface, proper alignment of the gauge is critical, too. a gauge even one degree off will give you vastly different readings from another gauge. If they work with rosettes, ( a network of 3 strain gauges) then it's easier as those aren't so sensitive to misalignment, but then you still have to take care to put in in the correct location. i.e. say 5cm from the pedal spindle. but then, the strain 5cm from a pedal spindle on a dura ace 7900 crank will be different than that compared to a campag record. even worse if you have other factors like decals, lacquer, crankskins, coming into play.
Wattteam is either doing LOTS of testing and have a very powerful algorithm taking all these into account...or their data simply isn't very accurate.
Or they have a clever calibration procedure.
The patent has a leaf spring to which strain gauge(s) are attached.
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- Location: Winnipeg Canada
In the process of a possible new build and sorting through options... Campagnolo SRM is the way I am leaning now.. but with the new 4 bolt system they introduced.. is it even possible for SRM to integrate since there are now 8 chainring bolts??? I assume anyone wanting to use a Campy SRM will still use the current 5 bolt?? Anyone heard any rumors??? I just hope Campy continues making 5 bolt rings!!
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