You say weedy teeth in regards to the helical teeth, but I've read a few pages of info, that of course may be wrong, that they are no weaker then straight cut teeth?
The reasons given for using straight cut teeth is for ease of manufacture, as its far easier to make straight cut gear sets then helical ones?
Of course nothing is as straight forward as first seems, and i'm sure that there is a lot more to it then that in terms of tooth design, loadings and materials etc, but what is the general thoughts on this, are straight cuts stronger or is this just a pub myth?
Heres one bit of text of explanation, though its not scientific in any way!
http://www.calverst.com/M-articles/1...nd%20noise.htm
Design. The original idea behind straight-cut gears (cut at 90 degrees across the gear) was really ease of manufacture. Where limited numbers of gears are made for development – be it standard or motorsport – straight-cut gears are far cheaper and easier to produce. A multitude of gear ratio options being available by ‘correcting’ proper tooth profiles to suit - excruciatingly difficult and not economically viable with helical teeth where very much more expensive tooling’s needed. Other bonuses were reduced loads and drag inherent in the helical (cut at an angle across the gear) design – therefore leaving more power to drive the car. That straight-cuts are stronger than helical gears is a myth. Helical cut teeth run quieter as they’re almost constantly engaged, also eliminating shock loads. They’re stronger through better tooth root design and more load-bearing area – the helical angle increasing overall tooth length and surface area by a small but appreciable amount.