All arrows rotate in flight due, in part, to the curl of the feathers. Head orientation at release means nothing in regards to ribs or hip bones for that matter, other than that some bows shoot best with North/South fitting while others shoot better with East/West orientation. The self-bows that shoot best with vertically mounted broadheads are few indeed. Some bows don't care and are usually bows with narrow handles or cut-out arrow rest shelves.(more centreshot). Just attend the North American Long Bow Safari and note how most broadheads are mounted. The North American Long Bow Safari is a broadhead-only, animal silhouette competition.
; The feathers, even though mounted straight, are either left wing or right wing. This makes them rotate right or left. Mixing feathers from both right and left wings onone shaft would help stop the arrow from spinning but would result in an innaccurate wobbly arrow due to the 'fight' between the fletches. Broadheads need good steerage and the shaft must spin to be accurate. Most self-bows shoot best with horizontal (East/West) mounting. This is due to the width of the bow at the arrow/rest location. The arrow bends around the bow upon release. If the broadhead is mounted vertically, the flat sides of the head try to steer the shaft and disrupts accurate flight iwht most, but not all bows. Arrow shaft 'spine' is very important and more important yet, the more 'obstacals' shoved in it's path.
; Straight fletched or helically fletched arrows will impact with the broadhead vertically oriented only at a specific range, which actually changes form arrow arrow to arrow, shot to shot. Try it out at a specific range and see if the arrow always impacts with the same orientation. Straight fletched arrows spin with less rotational speed than helically fletched arrow, of course, but still spin. Release, hold and bow dynamics will vary the actual orientation at impact from shot to shot. This is another instance where theory fails - slightly.
; That is a really nice bow and arrow set to own Nakihunter - display it with pride of ownership. Any idea what the bow's poundage would be?