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Assume that a drive efficiency improvement results in a 15% increase in drive weight and drive wt.
is 15% of bicycle wt. and bicycle wt. is 15% of total weight and that rolling resistance is 20% of
total power consumption because, let's face it, the 800 pound gorilla is wind resistance.
That's about 0.07% decrease in *overall* efficiency on flat land due to weight.
There may be some room for drive train efficiency improvements that will increase overall
efficiency.
Bret Cahill
Bret Cahill
[email hidden] (BretCahill) wrote in message
news:<[email hidden]>...
Quoted message said:Assume that a drive efficiency improvement results in a 15% increase in drive weight and drive wt.
is 15% of bicycle wt. and bicycle wt. is 15% of total weight and that rolling resistance is 20% of
total power consumption because, let's face it, the 800 pound gorilla is wind resistance.That's about 0.07% decrease in *overall* efficiency on flat land due to weight.
There may be some room for drive train efficiency improvements that will increase overall
efficiency.
Krikey, yes... if you look at the convoluted drivetrains of the "speedbikes" running at the WHPSC
this week, you'll see some of the lengths the builders go to in order to cram a rider into a
streamined shell.
BTW: Sam Whittingham is cracking off 75+ mph runs regular as clockwork:
wisil.recumbents.comresults.htmOpen ↗ Pics of vehicles with and without
fairings: wisil.recumbents.comresultswednesday.htmOpen ↗
Jeff
Wow.. 75+.. amazing.
I think I saw something about Sam Whittingham on TLC or Discovery a while ago.. really cool.
Mike mikebeauchamp.commikebeauchamp.comOpen ↗
"Jeff Wills" <[email hidden]> wrote in message
"]news:[email hidden]...
Quoted message said:[email hidden] (BretCahill) wrote in message
news:<[email hidden]>...
Quoted message said:Quoted message said:Assume that a drive efficiency improvement results in a 15% increase in drive weight and drive
wt. is 15% of bicycle wt. and bicycle wt. is 15% of total weight and that rolling resistance is
20% of total power consumption because, let's face it, the 800 pound gorilla is wind resistance.That's about 0.07% decrease in *overall* efficiency on flat land due to weight.
There may be some room for drive train efficiency improvements that will increase overall
efficiency.Krikey, yes... if you look at the convoluted drivetrains of the "speedbikes" running at the WHPSC
this week, you'll see some of the lengths the builders go to in order to cram a rider into a
streamined shell.BTW: Sam Whittingham is cracking off 75+ mph runs regular as clockwork:
wisil.recumbents.comresults.htmOpen ↗ Pics of vehicles with and without
fairings: wisil.recumbents.comresultswednesday.htmOpen ↗Jeff
"Jeff Wills" <[email hidden]> wrote in message
"]news:[email hidden]...
Quoted message said:BTW: Sam Whittingham is cracking off 75+ mph
Note: In some versions of the english language "cracking off" eq "farting".
"W K" <[email hidden]> wrote in message news:<[email hidden]>...
Quoted message said:"Jeff Wills" <[email hidden]> wrote in message
"]news:[email hidden]...Quoted message said:BTW: Sam Whittingham is cracking off 75+ mph
Note: In some versions of the english language "cracking off" eq "farting".
Hmmm... an interesting colloquialism. Sam's Canadian, I'm a U.S.-type person (I'll avoid using the
imprecise "American" designation.). Does that make a difference?
On the other hand... they're in completely sealed fairings. Maybe *that's* why he's going
so fast. ;-)
Jeff
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