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Date: 30 Jun 2007 02:55:07
From: joseph.santaniello@gmail.com
Subject: Reasonable CdA estimate for tandem?
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Hi All,
A riding buddy and I have been toying with the idea of getting a
tandem and trying to see what kind of crazy speeds we can achieve. For
fun I have been trying to calculate our times on various courses, but
I don't know what sort of CdA to use for these estimates. We are both
similar dimensions (193cm, 195cm, 98kg, 95kg) so we could switch being
captain on long rides, so it might be fun and FAST.
So what is a resonable CdA guesstimate? For myself in the drops I use .
35. How much more would a tandem be?
Joseph
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Date: 03 Jul 2007 08:07:38
From: NickP
Subject: Re: Reasonable CdA estimate for tandem?
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I rode a couple of time trials on a tandem with a friend a few years back.
Individually we both had a best time for 40km time trial of just under 58
minutes (that's on TT bikes with rear disk and aero bars). The tandem had no
aero gear - just normal spoked wheels and drop handlebars - the only
concession to the time trial was to swap the wide range freewheel for a
close ratio unit. We rode 56 minutes on our first attempt, and on the
second, where we'd had a bit more experience riding as a team, we reduced
that to just over 54 minutes. Aero gear might have been worth another couple
of minutes maybe...
Nick
<joseph.santaniello@gmail.com > wrote in message
news:1183197307.462147.11960@m36g2000hse.googlegroups.com...
> Hi All,
>
> A riding buddy and I have been toying with the idea of getting a
> tandem and trying to see what kind of crazy speeds we can achieve. For
> fun I have been trying to calculate our times on various courses, but
> I don't know what sort of CdA to use for these estimates. We are both
> similar dimensions (193cm, 195cm, 98kg, 95kg) so we could switch being
> captain on long rides, so it might be fun and FAST.
>
> So what is a resonable CdA guesstimate? For myself in the drops I use .
> 35. How much more would a tandem be?
>
> Joseph
>
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Date: 30 Jun 2007 14:00:52
From: joseph.santaniello@gmail.com
Subject: Re: Reasonable CdA estimate for tandem?
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On Jun 30, 10:26 pm, carlfo...@comcast.net wrote:
> On Sat, 30 Jun 2007 02:55:07 -0700, "joseph.santanie...@gmail.com"
>
> <joseph.santanie...@gmail.com> wrote:
> >Hi All,
>
> >A riding buddy and I have been toying with the idea of getting a
> >tandem and trying to see what kind of crazy speeds we can achieve. For
> >fun I have been trying to calculate our times on various courses, but
> >I don't know what sort of CdA to use for these estimates. We are both
> >similar dimensions (193cm, 195cm, 98kg, 95kg) so we could switch being
> >captain on long rides, so it might be fun and FAST.
>
> >So what is a resonable CdA guesstimate? For myself in the drops I use .
> >35. How much more would a tandem be?
>
> >Joseph
>
> Dear Joseph,
>
> There's a racing tandem radio-button and explanation on this speed
> calculator:
>
> http://www.kreuzotter.de/english/espeed.htm
>
> Running a calculation will give some figures.
>
> Cheers,
>
> Carl Fogel
You know that trick where you cover one eye and hold your gaze on one
spot and part of your field of vision disappears as it is obscured by
the optic nerve (or some similar discontinuity of the eye)? That is
the only explaination I can come up with as to why I didn't see that
earlier.
Joseph
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Date: 30 Jun 2007 14:26:37
From:
Subject: Re: Reasonable CdA estimate for tandem?
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On Sat, 30 Jun 2007 02:55:07 -0700, "joseph.santaniello@gmail.com"
<joseph.santaniello@gmail.com > wrote:
>Hi All,
>
>A riding buddy and I have been toying with the idea of getting a
>tandem and trying to see what kind of crazy speeds we can achieve. For
>fun I have been trying to calculate our times on various courses, but
>I don't know what sort of CdA to use for these estimates. We are both
>similar dimensions (193cm, 195cm, 98kg, 95kg) so we could switch being
>captain on long rides, so it might be fun and FAST.
>
>So what is a resonable CdA guesstimate? For myself in the drops I use .
>35. How much more would a tandem be?
>
>Joseph
Dear Joseph,
There's a racing tandem radio-button and explanation on this speed
calculator:
http://www.kreuzotter.de/english/espeed.htm
Running a calculation will give some figures.
Cheers,
Carl Fogel
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