Those are both bucket seats, just to different degrees.
Imagine a camera placed where the spine or leg is looking at the side of the seat. Look at how much exposed surface area faces the camera. Let’s call that surface area the ‘side restraint component’. (IE, if the side panel comes ‘up’ out of the seat 2", and extends out 4", the side restraint component is 2").
On a seat belt, you’ve got about 2" x 4" surface area on each side. So 8 square inches on each side. That’s all a bench seat gives you.
On that car seat you’ve got about 2.5" x 8" on the back, plus an average of let’s call it 2.5" x 4" on the seat. So that’s about 30 square inches on each side.
On the racing seat you’ve got about 14" x 20", but cut in half as a triangle, and let’s say the shoulder bit fills in the missing part by the belt opening. So call that 140 square inches per side.
The car seat may be designed for comfort, but the side bolsters do have a restraint effect.
Those are both bucket seats, just to different degrees.
Imagine a camera placed where the spine or leg is looking at the side of the seat. Look at how much exposed surface area faces the camera. Let’s call that surface area the ‘side restraint component’. (IE, if the side panel comes ‘up’ out of the seat 2", and extends out 4", the side restraint component is 2").
On a seat belt, you’ve got about 2" x 4" surface area on each side. So 8 square inches on each side. That’s all a bench seat gives you.
On that car seat you’ve got about 2.5" x 8" on the back, plus an average of let’s call it 2.5" x 4" on the seat. So that’s about 30 square inches on each side.
On the racing seat you’ve got about 14" x 20", but cut in half as a triangle, and let’s say the shoulder bit fills in the missing part by the belt opening. So call that 140 square inches per side.
The car seat may be designed for comfort, but the side bolsters do have a restraint effect.