In Reply To:
Rappstar, a techie question for your engineering mind:
I notice from the race photos and your replies so far that you used only two water bottles: one standard round between the aerobars and one Arundel on the seat tube.
My question is regarding the Arundel on the seat tube. I've had this same question ever since Chris Lieto did Kona a few years ago with the Bontrager aero bottles on both the downtube and seat tube. Weren't these aero bottles designed for aerodynamics going "forward", as in, facing forward when hung on the downtube?
We've all read how a standard round bottle on the down tube is actually more aero than no bottle there at all. But when an aero designed bottle is hung on the seat tube isn't it actually facing "backwards".
With only a rudimentary understanding of fluid dynamics or aero-ness, I would not assume that a boat or an airplane would pull through their mediums equally well both forwards and backwards. Would an aero bottle be equally effective pulling through the air forwards or backwards?
Do you see where I'm going with this? Or, is the Arundel bottle a compromised happy medium of aero-ness when facing either forward on the downtube or backwards on the seat tube?
I figure if ANYONE has considered this intelligently and with any authority--it's you.
Technically, the bottles SHOULD be oriented one way or the other. Or rather, I suppose it is possible to design a seat-tube optimized bottle and a downtube optimized bottle. But it should also be possible to design a shape that is relatively effective in either configuration. You'll not that Trek's seatpost on the TTX is symmetrical, and it seems to perform just fine. But then again, it should also be possible to design a bottle that matches up well for a given bike. So ideally, Trek should/could really have made a bonty bottle for seattube and for downtube that would have been best for the TTX. That may in fact be what they did. I am not sure.
The Garmin guys use the Arundel Chrono on their bikes in the same configuration, so I am piggybacking off some blind faith in there testing. I switched to the Arundel because it's possible to refill on the fly. I also happen to like the guys at Arundel a lot (not that I don't like the guys at Trek), so I figured "why not." They make only a handful of products, all of which are very good. So I thought I'd do what I could to help out, especially given that I thought it was a nice option to be able to refill it. I found it to be a bit more manageable than the Bontrager bottle in terms of taking it out, drinking, and putting it back in. I thought it was a bit more user friendly in that regard.
All in all, I don't think it's a critical decision. I think they are both good bottles and both faster than what else is out there, though maybe not as fast as what *COULD* be made.
"Non est ad astra mollis e terris via." - Seneca | rappstar.com | FB - Rappstar Racing | IG - @jordanrapp