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Found this on water bottle drag there is one real world aero penalty that wasn't possible to account for between the two BTA's tested because with a regular bottle Bta you have to sit up to drink but it gives you a pretty good idea. My bike set up like this but with acetate sheet fairings attached to form a nose cone broke even in proper aero testing compared to the bare frame. Also I'll try and find some proper data but there seems to be a trend for pro riders who wear very stubby or no tailed aero helmets like your air attack and their riding position. They all have a similar relaxed neck low head eyes down and lowish hand positions and i remember testing well with a Bambino in a similar position in my first ever aero testing session despite the kask supposedly not being very aero in stand alone testing. Obviously everything aero is rider specific and I'm just making assumptions but if your definitely going with the air attack and you said your upping your front end a higher elbow lower head position could work well for you. Hope some of that helps.
https://www.aero-coach.co.uk/water-bottle-testing
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Retro_Bastard
Some awesome tips and tricks here, thanks a lot! Overshoes and gloves noted.
This is very clever. Will look into the options you mentioned.
Not going all in. For now.