Originally Posted by Eyelise
I spoke with harness specialist at TeamTech when devising this approach. TeamTech has a great rep and does a lot of OEM work with Vipers. The anti-sub routing would go from the OEM lap mount under the thigh and up to the camlock. The length might actually be no longer than your set-up. This is the same approach fighter pilots use in jets. You essentially sit on the antisubs. It disperses the force more evenly across the pelvis and the angle is better to hold the pelvis back in the seat. It also favors the family jewels. Google teamTech and check out the JetPilot harness. My setup is a variation of this.
The more time I've spend on harness-related issues, the less comfortable I am deviating from what's recommended by the manufacturer. They seem best positioned to figure out what works, what doesn't, and how to design these things to minimize their liability. I'm not arguing with you (and won't). Your setup may well be fine -- I certainly hope so, although I'd rather that none of us ever have any first hand experience finding out -- and it sounds as if you've gotten buy-in from the manufacturer of your harness for it.
Just fyi, below is text from the Schroth manual for the Profi 6-HANS harness I purchased.
PROFI 6-POINT AND HYBRID MODELS
• Anti-submarining strap routing shall be vertical down from the groin, preferably approximately 20° back.
• Anchor points shall be approximately 100 mm [4”] lateral apart from each other. In case of a a low seating position (e.g. in open wheel race
cars), this separation may be reduced since the anchor points are closer to the thighs.
Schroth does make a harness specifically intended for the routing you're using (designated by an "F"), but they make it clear that it's intended for the sorts of (highly reclined and very thin) seating you find in a formula car. The manual says:
• Anti-sub straps must not be redirected. Redirected straps, e.g. using an OE stock seat for a formula type racing harness and running the straps over the seat edges down to an anchor point, will provide extra slack during a crash and the expected performance will not result. Slack from such anti-sub strap routing will allow a buckle ride up during an accident which results in higher upper torso and head movement. This increases the risk of head impact, head and neck injuries and internal injury.
Again, just fyi in the spirit of sharing what I've read. I hope none of us ever actually need this stuff.