CMS GT3/GT3RS Roll Bar Free Harness!
11-25-2017, 02:38 PM
#16
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Just re-sent it, I think our internet connection was faulty last night!
11-25-2017, 03:57 PM
#17
For those of you who really geek out on this stuff (like we do!):
From Schroth Harness Installation Instructions regarding the shoulder belts: "For the best restraint of the occupant’s upper torso, ideal anchor points should not be further back than 200 mm [8”] from back of user’s seat...Extremely long shoulder belts allow for extra elongation and head movement and should be avoided. Long shoulder belts also provide more slack during the rebound phase so the belts may slide off the occupant’s shoulders or HANS. SCHROTH HANS-specific restraints with lower elongation rates for such strap lengths are designed."
From ISP Racing Seats: "Although brevity is necessary with all the belts, you especially want to keep the shoulder straps as short as possible because they are the longest pieces of the system. Any safety harness will allow a certain percentage of stretch, so the longer the belt, the more overall stretch it will allow. To minimize shoulder-belt length, the belts should mount to a rollcage bar almost directly behind the driver’s seat and approximately level with his or her shoulder blades."
Other seat and harness manufacturers make similar suggestions. Does it mean only our roll bar is safe? Absolutely not. It does, however, mean that safety is our first priority and, again, form follows function.
From Schroth Harness Installation Instructions regarding the shoulder belts: "For the best restraint of the occupant’s upper torso, ideal anchor points should not be further back than 200 mm [8”] from back of user’s seat...Extremely long shoulder belts allow for extra elongation and head movement and should be avoided. Long shoulder belts also provide more slack during the rebound phase so the belts may slide off the occupant’s shoulders or HANS. SCHROTH HANS-specific restraints with lower elongation rates for such strap lengths are designed."
From ISP Racing Seats: "Although brevity is necessary with all the belts, you especially want to keep the shoulder straps as short as possible because they are the longest pieces of the system. Any safety harness will allow a certain percentage of stretch, so the longer the belt, the more overall stretch it will allow. To minimize shoulder-belt length, the belts should mount to a rollcage bar almost directly behind the driver’s seat and approximately level with his or her shoulder blades."
Other seat and harness manufacturers make similar suggestions. Does it mean only our roll bar is safe? Absolutely not. It does, however, mean that safety is our first priority and, again, form follows function.
That being said, if it's OK by Porsche to mount the belts on the rear section of the bar in their OEM Clubsport package and race series with the 991 Cup Cars, then it's OK for me in my humble HPDE use.
As always, it's nice to have options for those that have different priorities or preferences.
