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tech / rec.bicycles.tech / Re: Latest TT tech

SubjectAuthor
* Latest TT techAMuzi
`* Re: Latest TT techFrank Krygowski
 `* Re: Latest TT techAMuzi
  +- Re: Latest TT techFrank Krygowski
  `- Re: Latest TT techTom Kunich

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Latest TT tech

<uda9fg$2ip00$1@dont-email.me>

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https://www.novabbs.com/tech/article-flat.php?id=91270&group=rec.bicycles.tech#91270

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From: am...@yellowjersey.org (AMuzi)
Newsgroups: rec.bicycles.tech
Subject: Latest TT tech
Date: Wed, 6 Sep 2023 11:30:41 -0500
Organization: Yellow Jersey, Ltd.
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 by: AMuzi - Wed, 6 Sep 2023 16:30 UTC

https://cyclingindustry.news/bmc-launch-red-bull-advanced-technologies-co-developed-speedmachine/
--
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971

Re: Latest TT tech

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From: frkry...@sbcglobal.net (Frank Krygowski)
Newsgroups: rec.bicycles.tech
Subject: Re: Latest TT tech
Date: Wed, 6 Sep 2023 13:02:48 -0400
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 by: Frank Krygowski - Wed, 6 Sep 2023 17:02 UTC

On 9/6/2023 12:30 PM, AMuzi wrote:
> https://cyclingindustry.news/bmc-launch-red-bull-advanced-technologies-co-developed-speedmachine/

Whoa, look at that front fork clearance! Plenty of room for fenders! And
hey, built in storage for carrying stuff! If they add a handlebar bag, I
may buy one! :-)

They mention the water reservoir and tubing to allow drinking while
remaining aero. On my (only) double century ride, I cobbled up something
similar. It was just an oversized bottle with a long straw sitting
upright in my handlebar bag. It did allow drinking while on the aero
bars. If I'd taken more time, it would have benefited from a check
valve. I assume the Speedmachine has one.

--
- Frank Krygowski

Re: Latest TT tech

<udac5e$2j4qv$1@dont-email.me>

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From: am...@yellowjersey.org (AMuzi)
Newsgroups: rec.bicycles.tech
Subject: Re: Latest TT tech
Date: Wed, 6 Sep 2023 12:16:31 -0500
Organization: Yellow Jersey, Ltd.
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 by: AMuzi - Wed, 6 Sep 2023 17:16 UTC

On 9/6/2023 12:02 PM, Frank Krygowski wrote:
> On 9/6/2023 12:30 PM, AMuzi wrote:
>> https://cyclingindustry.news/bmc-launch-red-bull-advanced-technologies-co-developed-speedmachine/
>
> Whoa, look at that front fork clearance! Plenty of room for
> fenders! And hey, built in storage for carrying stuff! If
> they add a handlebar bag, I may buy one!  :-)
>
> They mention the water reservoir and tubing to allow
> drinking while remaining aero. On my (only) double century
> ride, I cobbled up something similar. It was just an
> oversized bottle with a long straw sitting upright in my
> handlebar bag. It did allow drinking while on the aero bars.
> If I'd taken more time, it would have benefited from a check
> valve. I assume the Speedmachine has one.
>

I believe current thought on that fork clearance is to
maintain laminar flow to the extent possible and minimize
turbulence or a 'venturi' pressure change.
--
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971

Re: Latest TT tech

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From: frkry...@sbcglobal.net (Frank Krygowski)
Newsgroups: rec.bicycles.tech
Subject: Re: Latest TT tech
Date: Wed, 6 Sep 2023 14:12:53 -0400
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 by: Frank Krygowski - Wed, 6 Sep 2023 18:12 UTC

On 9/6/2023 1:16 PM, AMuzi wrote:
> On 9/6/2023 12:02 PM, Frank Krygowski wrote:
>> On 9/6/2023 12:30 PM, AMuzi wrote:
>>> https://cyclingindustry.news/bmc-launch-red-bull-advanced-technologies-co-developed-speedmachine/
>>
>> Whoa, look at that front fork clearance! Plenty of room for fenders!
>> And hey, built in storage for carrying stuff! If they add a handlebar
>> bag, I may buy one!  :-)
>>
>> They mention the water reservoir and tubing to allow drinking while
>> remaining aero. On my (only) double century ride, I cobbled up
>> something similar. It was just an oversized bottle with a long straw
>> sitting upright in my handlebar bag. It did allow drinking while on
>> the aero bars. If I'd taken more time, it would have benefited from a
>> check valve. I assume the Speedmachine has one.
>>
>
> I believe current thought on that fork clearance is to maintain laminar
> flow to the extent possible and minimize turbulence or a 'venturi'
> pressure change.

Yes, I read that somewhere else. Interesting refutation of the previous
"Near Zero Clearance" design philosophy.

--
- Frank Krygowski

Re: Latest TT tech

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Subject: Re: Latest TT tech
From: cyclin...@gmail.com (Tom Kunich)
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 by: Tom Kunich - Thu, 7 Sep 2023 13:47 UTC

On Wednesday, September 6, 2023 at 10:16:34 AM UTC-7, AMuzi wrote:
> On 9/6/2023 12:02 PM, Frank Krygowski wrote:
> > On 9/6/2023 12:30 PM, AMuzi wrote:
> >> https://cyclingindustry.news/bmc-launch-red-bull-advanced-technologies-co-developed-speedmachine/
> >
> > Whoa, look at that front fork clearance! Plenty of room for
> > fenders! And hey, built in storage for carrying stuff! If
> > they add a handlebar bag, I may buy one! :-)
> >
> > They mention the water reservoir and tubing to allow
> > drinking while remaining aero. On my (only) double century
> > ride, I cobbled up something similar. It was just an
> > oversized bottle with a long straw sitting upright in my
> > handlebar bag. It did allow drinking while on the aero bars.
> > If I'd taken more time, it would have benefited from a check
> > valve. I assume the Speedmachine has one.
> >
> I believe current thought on that fork clearance is to
> maintain laminar flow to the extent possible and minimize
> turbulence or a 'venturi' pressure change.
> --
> Andrew Muzi
> a...@yellowjersey.org
> Open every day since 1 April, 1971

I don't think that has any merit. The air out there is chopped to pieces with the legs going up and down. The front wheel bobbling back and forth, and hopping up and down. There is not the slightest laminar flow after the initial penetration of the wheel, fork and handlebar
everything else is frontal area. I agree that there is probably less venturi effect. But is it even measurable in effect?

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