Spoked Wheels question

Some aircraft wheels seem to have assymetric spokes. Examples are RAF FE2b, Bristol M1C, Spad 13, etc.
One set of spokes form a flat plane, while the other set form a broad cone. Seen in front view (edge-on), one side of the wheel is flat while the other pokes out.
Question 1: how is it possible to make such wheels? Since the spokes are all pre-tensioned, wont the flat-side spokes simply bend over when the cone-side spokes are tensioned?
Question 2: Isnt the asymmetric wheel inherently weaker than a symmetric one? In which case, what are the benefits for making asymmetric wheels.

Any answers will be greatly appreciated.
See URLs:
http://www.wwi-models.org/Photos/Bri/Brist...tM1C/index.html

http://www.wwi-models.org/Photos/Fre/SPAD1...13/djs13_09.jpg

thanks
SSH

[MikeW]

There is an article on spoked wheel construction in an old issue of Cross & Cockade GB - If you look on their webside there is an index to previous articles.

My motorbike has one set of spokes offset a lot more than the other, different lengths too. Due to the hub shape, if they were symmetrical the rim would not sit on the centre line between the forks.

Mike

Mike,
Thanks a lot. That deinitely helps.
SSH