I seem to be still tripping up when it comes to calculating crosswinds when they are more than 90 degrees. I use the crosswind tables and or the wind component grid with angle less than 90. But when it comes to angle greater than 90 degrees, (which was my first question on the first attempt of the exam) I thought I could use the back side of the ASA E6B, set my wind direction, mark the wind speed, and then turn onto my RWY heading, reading the wind speed to either the left or right. Can someone shed some light onto how this is achieved with my e6b? Or will I have to go the long way round?

Thanks in advance

You're trying to overthink things a bit, I fear.

Doesn't matter whether you do the calculation using the AIP tables or mathematically, using the CR trig scale multiplication. The AIP tables are based on the trigonometry, anyway. It's exactly the same if you do it graphically.

You can take the winds to be symmetrical about the abeam position. What that means is that for

(a) 90° all crosswind and no H/W or T/W, presuming that you are looking at the geometry and not actually flying the crosswind.

(b) 80°/100° each has the same crosswind. Each has the same R/W component, it's just that one is a H/W and the other a T/W

(c) 70°/110° ditto

(d) 60°/120° ditto

(e) 50°/130° ditto

(f) 40°/140° ditto

(g) 30°/150° ditto

(h) 20°/160° ditto

(i) 10°/170° ditto

(j) 0°/180° all H/W or T/W with no X/W.

Sounds like you have the computer technique down pat. Can you scan and post an example ? If you are getting yourself a tad confused along the way, we can sort it out for you. it's done the same way as you figure out the H/W (or T/W) and X/W for the normal CR nav triangle solution.

The easiest, quickest, and most accurate way to sort it out is to use the wind side CD scales on the CR. These are set up for trigonometric multiplication/division. Figure the angle of the wind off the runway direction. Then set the wind speed using the TAS index mark. Read the outer scale just as you would when figuring the crosswind value for the nav problem and you will have the crosswind for the runway and then do the ETAS calculation to get the H/W or T/W. Easy peasy.

If you're using a Dalton (E6B) they generally don't have any trig material incorporated so you have to use a squared grid (if your machine has such) and read off the components. Note that the ASA E6B circular is not an E6B at all. It is a CR, pure and simple.