>>Those triangular nets are call Head Guiding nets. They are
>>designed to minimise neck twisting in a rollover. <snip>
>The most recent (or maybe the one before that) copy of the
>SCCA publication 'SportsCar' had an article on saftey, and
>mentioned these head guiding nets. Seems to me they may be
>useful in helping in the case of side impacts <snip>
Yes, they also minimise neck/head movement in side impacts, too. Inadvertant omission... I'll update my post.
They don't do much to protect from side impact intrusion.
>>* yes, they work to keep the lap belt low but it's not the
>>anti-submarine straps' main design function.
>Actually, I think I remember reading exactly the opposite (I
>think it was in the safety / instruction pamphlet that came
>with my Schroth harnesses) i.e. the purpose of the 5th/6th
>point is in fact not in and of itself meant to physically
>prevent your forward movement .... it's purpose is to keep
>the lap belts low, and it is the restriction of the lap
>belts moving up that keeps the body from submarining under
Definitely, a low lap belt does a great deal to help in anti-submarining, e.g., passenger car safety using 3pt harnesses. Position of the lap belt's anchors is another factor in keeping the lap belt low.
The main point of my comments were that the 6pt harness does a much better job of restraint.
Tho, hmmm...I might have mixed facts on 5pt v. 6pt...I'm trying to paraphrase Dr. Melvin from my 2yo notes so my comments are suspect.
I don't claim to be a belt expert, either.
Thinking some more, I would agree that the main function of the 5-point harness' 5th belt is to keep the lap belt low.
The 5pt harness does little, tho, to keep the lower extremities from moving forward, i.e., 'pulling' one's body under the lap belt. For example, if the collision is off-center, one's body will have a tendency to skew around the 5th belt.
The 6th & 5th belts of a 6pt harness, 'properly anchored below or behind the butt', does a great deal to prevent this forward movement, even in an off-centered crash.
Methinks my original post needs some cleaning up...
><snip> ... (....Schroth) may well be wrong. <snip>
I would believe Schroth over my ramblings. Regardless of which is the main function, the point is that a low lap belt & lower extremity restraint prevent submarining.