from this thread:
HERE
i saw this recommendation on angles:
Quote:
Originally Posted by aerohead
If you were only dropping from the top,your best angle would be 9-degrees.
If you'll do a 10-degree side angle boat-tailing,plus a 10-degree upswept diffuser you can exaggerate the top slope to 25-degrees.Chamfering the edges will net you the drag minimum.It will be very much like the Aero RV.On a simple 'box' form,this tail delivers a 0.0934 drag reduction (delta-35.6%).This was all tested in 1984 by S.R.Ahmed et al.You'd find it in Hucho's text.
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that seems like a very reasonable taper - but, i'm not sure about the chamfer - should it just be a straight 45-deg or would a curve between them be better? (or better enough for the effort vs the 45, which would be a lot more straight forward?)
the top to side corner(s) already have a chamfer that i could taper from possibly? would look better at any rate (assuming i don't do a bad job anyhow...)
Either way i plan on mocking something up with wood and sheeting - maybe even cardboard so i'll have some practice...