To find the actual wind using a Jep computer:

You need to know the TAS. Say 180.
You need to know the GS. Say 170.
You need to know the TMG. Say 050
You need to know the HDG used. Say 058

Method:
Set the TMG of 050.
Set the TAS of 180.
The GS is 170 so you have a 10kt head wind.
Draw a horizontal line through the 10 kt headwind scale.

The heading used was 058 so you have 8° of drift with wind from the right.
On the outer scale read 25 kt of crosswind against 8° of drift.
Draw a vertical line through the 25 kt crosswind scale to intersect the headwind line.

Rotate the disk to place the intersection of the two lines over the vertical axis.

Read the wind direction of 118° and wind speed of 28 kt.

[attachment=332]Actualwind.png[/attachment]

How did you get 118º @ 28kts? I keep getting 073º @ 28kts 

This is an ancient thread suddenly popping up on the boards.

Can you find actual wind using the wizz wheel

You can work the problem backwards on either the Dalton or the CR.   Dalton is a bit easier and less subject to inadvertent error but not overly difficult to do on either device at all.

The GS is 170 so you have a 10kt head wind.
Draw a horizontal line through the 10 kt headwind scale.

That's what most folks would do but it is not quite correct.   For the CR, suggest you use the ETAS value to calculate the headwind.   Unless there be nil drift, head/tailwind always is based on ETAS, not TAS - that applies to both devices as the TAS/GS are vectors not in the same line, so the trigonometry has to come into play.   As the drift angle increases, so does the wind component error.   Easier on the Dalton as you are just plotting the graphics to find the solution.

@john-heddles Thanks John, I will look into it Paul

Now we can see why an ancient thread was resurrected.   Wayno's post is only now showing up, so the thread resurrection was due to his post.

For Wayno, I think you might need to rework your process.   

Alternatively, list the sequence of operations you are running, with their intermediate results, and we should be able to see if there be a problem somewhere in the works.

First concern, always, is that the whizz wheel solutions include noticeable round off errors and the question values will, also, include round off errors.   These are of no great concern for piloting as the inherent errors are within the solution noise.  If you can fly to a heading accuracy of 0.1 degree, you are much, much more skilled than I.

Looking at the various answers from the whizz wheels

(a) mine      W/V  120/27   -  on the CR

(b) Bob's      W/V  118/28

(c) Wayno's  W/V  073/28

(d) mine       W/V  120/26  -  on the Dalton

reason mine and Bob's are pretty close is the drift is fairly small and ETAS progressively gets closer to TAS so there is not much difference if the drift is not considered.

Now if we use the calculated W/V values we can run the sums the other way, but mathematically, rather than on the wheels, to see what the effect is on the calculated GS and HDG

(a) question   GS 170     HDG  058

(b) mine        GS 169.0  HDG  058.1

(c) Bob's        GS 167.6  HDG  058.3

(d) Wayno's   GS 153.9  HDG  053.5