The Photo above is of the 3 ribs that cover the "sweet" Spot.
On the topic of broadheads We'v had a bunch of heads used over the last few years outside of what i have tested.
Some worked well, some did not, some failed as a result of a poor hit, some just got unlucky, and some directly as a result of the broadhead failing upon impact.
There are 2 main failure's i see in broadheads.
Both are from poor structural integrity be it due to the design or the material of the head or both.
Of the 2 failure's the worst is the head actually breaking, this usually happens within the front third of the head near the tip, usually right in front of where the ferrule taper ends and it just becomes the blade. Its is a hinge point, where the heads that are to brittle and hard to bend so just break.
Im am in two minds as to actually Name the heads iv seen break and bend "consistently", I am only putting this information up to help other hunters and can think of nothing worse then someone booking a hunt of the lifetime and having the head they choose Fail them. So I think if you want to know Just PM me.
The Second failure which is quite common is the head bending this is also most common near the tip of the head. But iv seen the head bend through the ferrule and at the insert.
Either way if the head bends or breaks upon hitting a bone, its going seriously hider penetration and your in trouble.
The next most common failure is the head bending at the Insert or the insert breaking out of the shaft or splitting it. And is the main reason i Foot "all my arrows" no mater what i hunt. Why risk that when there is a way to fix it.
There are quite a few specialist big game heads out now if i can call them that. But they are not all made the same, in fact there have been some serious issues with some. And just because a head may cost $30 or $40 each...does not mean it is the best!