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SvdM · 09-16-2010, 02:36 AM

Okay, so I can assume 12° is the 'no fail' amount for DIY jobs that's still good for highway speeds, say 120km/h? I'm assuming the 18° works if your handiwork is tidy and you are a little morecareful with your right foot

So I can postulate:

1. That if you're going for the 'chopped off' boat tail design, best go for 18° rather than 12° in order to keep the low pressure area at the rear to a minimum.

and

2. Even if there is some detached flow on your 18° boat-tail, it's still better than no boat-tail at all (?)

09-16-2010, 02:36 AM	#55 (permalink)
SvdM EcoModding Lurker Join Date: Jul 2010 Location: South Africa Posts: 85 Old but Gold - '87 Volkswagen Jetta CSL 90 day: 30.87 mpg (US) Thanks: 9 Thanked 12 Times in 8 Posts	Okay, so I can assume 12° is the 'no fail' amount for DIY jobs that's still good for highway speeds, say 120km/h? I'm assuming the 18° works if your handiwork is tidy and you are a little morecareful with your right foot So I can postulate: 1. That if you're going for the 'chopped off' boat tail design, best go for 18° rather than 12° in order to keep the low pressure area at the rear to a minimum. and 2. Even if there is some detached flow on your 18° boat-tail, it's still better than no boat-tail at all (?)