1. Stiff tips- less stack
Effective.
2. Wide flat limbs(2") with narrowed handle- distribution of stress and concentraiton of bend in handle and to mid-limbs
Effective.
3.highly reflexed/recurved- more bending/farther capabilities
Tends to add stress to already heavily taxed limbs in my view. Adds mass on the outer limbs. Theoretically justified, hard to demonstrate in practice.
4. D-style- more overall working limbs
Sacrificies string angle.
It's all a giant circle, one trade off leading 'round the mulberry bush to the next. Quality of materials, craftsmanship weigh pretty heavy in the grand scheme of things.
The best short bow design I've used so far, among four distinct variations I've tried in 6 or 7 specimens incorporates 1. and 2. Other less desirable ones used 3. and 4. and some others, deflex in the handle w/ modest recurve for example. I'm currently enamoured with a mild r/d in a backed bow but haven't tried it for a shorty.
http://home.midsouth.rr.com/ddmims/abc0704.JPGhttp://home.midsouth.rr.com/ddmims/abc0705.JPGWhat do you consider short? This one is 58" for 63# @ 28". Makes 3# per inch from 24" to 28".