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Aero water bottles in TdG?

Old 04-20-07, 01:37 PM
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ratebeer
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Aero water bottles in TdG?

Looks like Toyota-United is using an Arundel type aerodynamic water bottle rumored to have the same savings as a tri spoke front wheel. Is research on this not public, no one cares or what?

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Old 04-20-07, 01:43 PM
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Looks kind of like the old campy biodynamics
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Old 04-20-07, 01:47 PM
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I've seen some research on this before - I think from the MIT guys. Let me try to find the study on waterbottle setups. I even read placement of the bottle cage makes a difference too.
BTW, it's a Bonty waterbottle setup. I'm trying to get one of those my TT bike.
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Old 04-20-07, 01:51 PM
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Here it is.
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Old 04-20-07, 02:31 PM
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Its a big secret but they were nice enough to sell them to anyone with $65

link
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Old 04-20-07, 03:52 PM
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I have a few. They are nice.
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Old 04-20-07, 03:56 PM
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any websites selling them in the US?
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Old 04-20-07, 04:06 PM
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Originally Posted by jrennie
Its a big secret but they were nice enough to sell them to anyone with $65

link
lol

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Old 04-20-07, 04:10 PM
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I have an Arundel bottle. I set it up right in the vertex of my seat tube and downtube though.
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Old 04-20-07, 04:57 PM
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It doesn't seem like anyone's publicly quantified the advantage of these bottles. I couldn't find anything in the MIT blurb above but I didn't hit it from all angles-- just a cursory search.

Considering the rumor is that these are up there with a tri-spoke front wheel (more advantageous than a disk rear wheel), it's pretty odd that no one cares enough to publish on it. Of course the MIT team found the bento box to be insanely effective as well. (?! - grains of salt, many grains of salt)
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Old 04-20-07, 04:57 PM
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Originally Posted by Stallionforce
I have an Arundel bottle. I set it up right in the vertex of my seat tube and downtube though.
Have you ever done coast downs with these bottles versus a "normal" one? Could you do it for "science" and your good friends at BF, if you haven't?
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Old 04-20-07, 05:08 PM
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I have not done a coast down, nor will I, but when choosing between my aero bottle and a regular bottle for a 40k, just looking at the frontal profile and how well is sits in the triangle of the P3C, I will gladly use it. I just have trouble imagining that it would be worse than a round bottle.
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Old 04-20-07, 05:24 PM
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where is this MIT report?
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Old 04-20-07, 05:24 PM
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Originally Posted by DrWJODonnell
I have not done a coast down, nor will I, but when choosing between my aero bottle and a regular bottle for a 40k, just looking at the frontal profile and how well is sits in the triangle of the P3C, I will gladly use it. I just have trouble imagining that it would be worse than a round bottle.
I completely see your point. Sounds very logical.

Unfortunately the wind tunnel doesn't seem all that straight forward. The most popular report on bottles in the wind tunnel suggested that the round bottle on the down tube disrupted the airflow enough so that the effect was similar to having no seat tube -- the author compared the benefit to riding a SoftRide (no seat tube). It was also a surprise to many that one bottle on the down tube was faster than one on the down tube and one on the seat tube.
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Old 04-20-07, 08:39 PM
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I don't think I can manage a coast down with the different bottles!

I did read a study on slowtwitch where it was suggested that bikes are actually more aero with a bottle on the downtube than without. So even if you aren't drinking in a short club TT, put an empt bottle in your cage.
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Old 04-20-07, 10:53 PM
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Originally Posted by Stallionforce
I have an Arundel bottle. I set it up right in the vertex of my seat tube and downtube though.
I also put the Arundel as low as I could (there is about 0.5 cm between the bottle and the seattube). To do this, I just drilled two new holes in the cage.

Wind tunnel tests with Floyd last year showed that--on his BMC at least--the Arundel is faster than no bottle at all. The trick is to put it really low so it acts as a legal fairing between the down and seat tubes. http://www.competitivecyclist.com/za...RSET_VERSION=1

I'm just hoping it has the same effect on my new steed:

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Old 04-20-07, 11:04 PM
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Originally Posted by Nagedzi
I also put the Arundel as low as I could (there is about 0.5 cm between the bottle and the seattube). To do this, I just drilled two new holes in the cage.

Wind tunnel tests with Floyd last year showed that--on his BMC at least--the Arundel is faster than no bottle at all. The trick is to put it really low so it acts as a legal fairing between the down and seat tubes. http://www.competitivecyclist.com/za...RSET_VERSION=1

I'm just hoping it has the same effect on my new steed:

Bizarre, you and I have the same bike, the same bottle, and we both drilled out new holes for the cage.
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Old 04-21-07, 12:54 AM
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Originally Posted by Stallionforce
Bizarre, you and I have the same bike, the same bottle, and we both drilled out new holes for the cage.
I think I just replied to a question of yours on Roadie, too! Funny. See you in Courtenay on Sunday?
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Old 04-21-07, 01:11 AM
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Originally Posted by Nagedzi
I think I just replied to a question of yours on Roadie, too! Funny. See you in Courtenay on Sunday?

This is getting weirder and weirder. Yes you probably will!
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