Aero seatpost

On Sun, 27 Feb 2005 13:20:20 -0700,
wrote:

On Sun, 27 Feb 2005 15:08:16 -0500, "psycholist"
wrote:

"S o r n i" wrote in message
. ..
psycholist wrote:
I'm building up a TT bike. I've got it all put together, but it's
got a very conventional seatpost. Does anyone have any good data
that would point to whether or not investing in a good aero seatpost
would make any meaningful difference? I'm considering one of the
Corima carbon posts, but I don't need to toss $125 if it's just a
waste. On the other hand, my objective is to assemble the fastest
bike I can and that's one area that remains to be addressed.

Thanks for any insights.

Get it. You know you want to. eg


Yep ... you got that right. That Corima pin would look awesome. But I am a
mesomorph ... great big 'ol thighs that probably block that entire airspace
already, anyway. But you've got me pegged. As soon as I finish
rationalizing the spending of the money, I'll have that post. I'm just not
quite there yet.

Dear Dan,

A good rationalization executed today is better than a
perfect rationalization executed at some indefinite point in
the future.

George Patton

Oops--Bob, not Dan!

wrote in message
...
On Sun, 27 Feb 2005 11:46:34 -0800, "Dan"
Dear Dan,

When I look at the details here . . .

http://www.multisports.com/news/1057782031.shtml

. . . I do see pedal cadence, so the rear wheel is moving.
The text is a little unclear about whether this is unlike
other wind tunnel test platform--they may mean only that
it's raised to eliminate ground effect (presumably from the
tunnel, not normal ground effect, but maybe not).

But the front wheel is probably more important than the
rear, since the rest of the bike passes through its
turbulence, and I can't find anything about it spinning.

The middle picture ("straight ahead") shows the front spokes
apparently motionless, but it could be just the illusion of
a high-speed snapshot or perhaps only a posed picture, not
live and spinning.

There might be a small patch under the front wheel with
rollers too small to see in the picture, but the patch might
be just the reflection from the rim on the polished metal
surface. The text says only that "the front wheel stands
free, without any supports to throw off drag readings."

If they have an amazing set of powered front rollers that
spin the front wheel up to the speed indicated on the rear
wheel, I think that they'd mention it.

Thanks for the link--I like to peer at such stuff.

Carl Fogel

A bit of googling finds:
http://slowtwitch.com/mainheadings/t...newtunnel.html

Which states:
"There are a pair of motors that independently turn the front and rear
wheels."

A photo shows the rollers:
http://slowtwitch.com/mainheadings/t...newtunnel1.jpg

This sounds like a pretty cool setup with variable speeds and pedaling
resistance. The idea of testing the rider's power and efficiency in an aero
position is a good one.

Have fun,
Dan

"psycholist" wrote:

"S o r n i" wrote in message
.. .
psycholist wrote:
I'm building up a TT bike. I've got it all put together, but it's
got a very conventional seatpost. Does anyone have any good data
that would point to whether or not investing in a good aero seatpost
would make any meaningful difference? I'm considering one of the
Corima carbon posts, but I don't need to toss $125 if it's just a
waste. On the other hand, my objective is to assemble the fastest
bike I can and that's one area that remains to be addressed.

Thanks for any insights.

Get it. You know you want to. eg

Yep ... you got that right. That Corima pin would look awesome. But I am a
mesomorph ... great big 'ol thighs that probably block that entire airspace
already, anyway. But you've got me pegged. As soon as I finish
rationalizing the spending of the money, I'll have that post. I'm just not
quite there yet.

Chics dig 'em... does that help?

Mark Hickey
Habanero Cycles
http://www.habcycles.com
Home of the $695 ti frame

"Mark Hickey" wrote in message
...

Chics dig 'em... does that help?

Mark Hickey
Habanero Cycles
http://www.habcycles.com
Home of the $695 ti frame

That does it. Where's my credit card?

--
Bob C.

"Of course it hurts. The trick is not minding that it hurts."
T. E. Lawrence (of Arabia)

psycholist wrote:
I'm building up a TT bike. I've got it all put together, but it's got a
very conventional seatpost. Does anyone have any good data that would point
to whether or not investing in a good aero seatpost would make any
meaningful difference? I'm considering one of the Corima carbon posts, but
I don't need to toss $125 if it's just a waste. On the other hand, my
objective is to assemble the fastest bike I can and that's one area that
remains to be addressed.

Thanks for any insights.

it costs about that for a carbon post anyway, so if you want a tt bike,
& it looks the part, why not?

On Sun, 27 Feb 2005 12:35:44 -0800, "Dan"
wrote:


wrote in message
.. .
On Sun, 27 Feb 2005 11:46:34 -0800, "Dan"
Dear Dan,

When I look at the details here . . .

http://www.multisports.com/news/1057782031.shtml

. . . I do see pedal cadence, so the rear wheel is moving.
The text is a little unclear about whether this is unlike
other wind tunnel test platform--they may mean only that
it's raised to eliminate ground effect (presumably from the
tunnel, not normal ground effect, but maybe not).

But the front wheel is probably more important than the
rear, since the rest of the bike passes through its
turbulence, and I can't find anything about it spinning.

The middle picture ("straight ahead") shows the front spokes
apparently motionless, but it could be just the illusion of
a high-speed snapshot or perhaps only a posed picture, not
live and spinning.

There might be a small patch under the front wheel with
rollers too small to see in the picture, but the patch might
be just the reflection from the rim on the polished metal
surface. The text says only that "the front wheel stands
free, without any supports to throw off drag readings."

If they have an amazing set of powered front rollers that
spin the front wheel up to the speed indicated on the rear
wheel, I think that they'd mention it.

Thanks for the link--I like to peer at such stuff.

Carl Fogel

A bit of googling finds:
http://slowtwitch.com/mainheadings/t...newtunnel.html

Which states:
"There are a pair of motors that independently turn the front and rear
wheels."

A photo shows the rollers:
http://slowtwitch.com/mainheadings/t...newtunnel1.jpg

This sounds like a pretty cool setup with variable speeds and pedaling
resistance. The idea of testing the rider's power and efficiency in an aero
position is a good one.

Have fun,
Dan


Here's another photo where you can glimpse the roller that drives the
front wheel:
http://www.cyclingnews.com/tech.php?...el/Scottset-up
or http://tinyurl.com/6rowq

On Sun, 27 Feb 2005 17:16:53 -0600, dianne_1234
wrote:

On Sun, 27 Feb 2005 12:35:44 -0800, "Dan"
wrote:


wrote in message
. ..
On Sun, 27 Feb 2005 11:46:34 -0800, "Dan"
Dear Dan,

When I look at the details here . . .

http://www.multisports.com/news/1057782031.shtml

. . . I do see pedal cadence, so the rear wheel is moving.
The text is a little unclear about whether this is unlike
other wind tunnel test platform--they may mean only that
it's raised to eliminate ground effect (presumably from the
tunnel, not normal ground effect, but maybe not).

But the front wheel is probably more important than the
rear, since the rest of the bike passes through its
turbulence, and I can't find anything about it spinning.

The middle picture ("straight ahead") shows the front spokes
apparently motionless, but it could be just the illusion of
a high-speed snapshot or perhaps only a posed picture, not
live and spinning.

There might be a small patch under the front wheel with
rollers too small to see in the picture, but the patch might
be just the reflection from the rim on the polished metal
surface. The text says only that "the front wheel stands
free, without any supports to throw off drag readings."

If they have an amazing set of powered front rollers that
spin the front wheel up to the speed indicated on the rear
wheel, I think that they'd mention it.

Thanks for the link--I like to peer at such stuff.

Carl Fogel

A bit of googling finds:
http://slowtwitch.com/mainheadings/t...newtunnel.html

Which states:
"There are a pair of motors that independently turn the front and rear
wheels."

A photo shows the rollers:
http://slowtwitch.com/mainheadings/t...newtunnel1.jpg

This sounds like a pretty cool setup with variable speeds and pedaling
resistance. The idea of testing the rider's power and efficiency in an aero
position is a good one.

Have fun,
Dan


Here's another photo where you can glimpse the roller that drives the
front wheel:
http://www.cyclingnews.com/tech.php?...el/Scottset-up
or http://tinyurl.com/6rowq

Dear D(i)an(ne),

Aha! I can see the front roller (presumably powered) in all
the pictures that you both supplied of the wind tunnels. Now
that I know that I was simply out of date, I can sleep
better.

(The picture with the front spokes apparently motionless
must be posed or high-speed film.)

Thanks to both of you,

Carl Fogel