Problem with tutorial - using units

[philem]

Need a bit of help again guys,
I am following a tutorial to model a Junkers F13, this is a copy of a particular command in the PDF

Wings does not specify dimensional units, and uses an arbitrary dimension known as a Wings-unit. For the purposes of modeling here, let's assume from now on that 1 Wings-unit = 1 m. Now from the right-click menu, right click on the Cube option. Find the dimension that lies on the axis of the wing span in the plans, and set it to 17.75.

I don't know what this is or how to set it to 17.75, I have bought the plan in, bought the cube in but cannot find out how to set these units, I have searched the forum, checked in the Wings 3D manual 1.61, Wings 3D handbook, Wings 3D book, Googled it, checked out a few video tutorials I have downloaded but cannot find anywhere that it mentions setting dimensions.

Can someone help please?

As always
any and all help is greatly appreciated.

[Fonte Boa]

According http://en.wikibooks.org/wiki/Wings_3D/Tu...unkers_F13
this kind of airplane has a wingspan of 17,75m.

So just right click (Body menu), and another right click (or click on the little rectangle at "cube" word) on Cube command, and type "17,75" on X axis. This long cube is your reference to F13 airplane wingspan.

EDIT: As the tutorial mention: "The cube will be a temporary reference for scaling the image-plane containing the plans."

[philem]

According http://en.wikibooks.org/wiki/Wings_3D/Tu...unkers_F13
this kind of airplane has a wingspan of 17,75m.

So just right click (Body menu), and another right click (or click on the little rectangle at "cube" word) on Cube command, and type "17,75" on X axis. This long cube is your reference to F13 airplane wingspan.

EDIT: As the tutorial mention: "The cube will be a temporary reference for scaling the image-plane containing the plans."

Thanks Fonte,

I do feel dumb, I looked at that little rectangle but never clicked on it. I just spent 2 1/2 hours going through all the tutorials I found on Google looking for an answer.
Well here we go