New H&N restraint design...
#121
I like the design, actually, as it provides mobility and protection from all angles. I'd like to see more data and some independent testing with other devices such as Isaac and Hans (and R3) for comparison. Of course it is better than no restraint, any such item would be, but how it compares in the barrage of tests is what would interest me most. SFI approval helps, but we want more...what happened to the fellow (not Dirk) from Leatt who was here early on the thread?
#122
Rennlist Member
Originally Posted by Veloce Raptor
Correct. I have nothing against him if he is, but would prefer that he level with us. His behavior suggests he is, but the Secret Squirrel act is getting tiresome.
BUMP
...and still no answer....
#123
The cause of basilar skull fracture is too much tensile force betweem the base of the skull and the neck due to the head moving forward and rotating while the neck is restrained. A stop under the chin will simply put a compressive upward force on the jaw, providing a fulcrum point for the base of the skull to rotate around, and thus INCREASING the tensile force between the base of the skull and the neck in a frontal impact. A HANS device counters the rotation of the head by applying a force REARWARD on the helmet, and thus reduces the tensile force between the neck and the base of the skull. But you already knew that......
#125
Originally Posted by schvetkaaks
What is the primary benefit on the Hans device for the quick release tethers? Are the standard tethers that much of an issue?
#126
I believe that the quick release tethers are for ease of driver egress. The HANS can get caught on the roll cage, or in the belts, etc. if you are not used to exiting the vehicle with it on. I have made a rule that my driver exits the vehicle after EVERY session with his helmet AND HANS so that it's second nature to NOT get caught on anything. This conditions him to exit the car the same way - every time. Practicing emergency exits is key - and you should be able to get out of your car with your eyes closed in 15 seconds.
#127
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So, does that mean the HANS QR tethers are not SFI compliant?
Just amusing myself. Please, carry on.
--------------------------------
Gregg (the Isaac guy) Baker
Just amusing myself. Please, carry on.
--------------------------------
Gregg (the Isaac guy) Baker
#128
Burning Brakes
Originally Posted by ltc
Instruction manual (12 page .pdf):
http://www.leatt-brace.com/pdf/r_instruction_manual.pdf
Interesting that there are so many nuts/bolts in the setup/assembly.
Also interesting to NA$CAR fans is the use of a Dale Earnhardt Jr racing suit and lookalike on page 4
http://www.leatt-brace.com/pdf/r_instruction_manual.pdf
Interesting that there are so many nuts/bolts in the setup/assembly.
Also interesting to NA$CAR fans is the use of a Dale Earnhardt Jr racing suit and lookalike on page 4
#129
Rennlist Member
Originally Posted by Janni
I believe that the quick release tethers are for ease of driver egress. The HANS can get caught on the roll cage, or in the belts, etc. if you are not used to exiting the vehicle with it on. I have made a rule that my driver exits the vehicle after EVERY session with his helmet AND HANS so that it's second nature to NOT get caught on anything. This conditions him to exit the car the same way - every time. Practicing emergency exits is key - and you should be able to get out of your car with your eyes closed in 15 seconds.
Exactly.
I actually prefer my HANS without the QR tethers...and I practice exiting with helmet & HANS every time I get into a race car.
#131
Originally Posted by smokey
The cause of basilar skull fracture is too much tensile force betweem the base of the skull and the neck due to the head moving forward and rotating while the neck is restrained. A stop under the chin will simply put a compressive upward force on the jaw, providing a fulcrum point for the base of the skull to rotate around, and thus INCREASING the tensile force between the base of the skull and the neck in a frontal impact. A HANS device counters the rotation of the head by applying a force REARWARD on the helmet, and thus reduces the tensile force between the neck and the base of the skull. But you already knew that......
#132
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SFI 38.1 only measures upper neck tension/compression (F-sub-Z) and, in effect, front/rear bending (M-sub-y). No side loads, no shear loads and it doesn't give a hoot about combined loads at prominent bony structures, much less principle stresses which, when compared with bone strength, can predict a fracture. And most "SFI certified" products do not meet SFI's definition of a H&N restraint.
Aside from that, the spec is perfect.
Gregg (Isaac) Baker
Aside from that, the spec is perfect.
Gregg (Isaac) Baker
#133
Hello all,
This is my first post on your fine forum. I've lurked for a while though and found this thread linked from the Leatt Brace website. I am the owner of a company called Safe Drives LLC. My company specializes in retailing only auto safety related products. Wherever possible we try to offer only tested and certified safety products. A head and Neck Restraint is a product that meets that criteria.
SFI 38.1 exists as a standard and many other devices have failed to obtain the SFI 38.1 certification.
Mr. Baker, do you know of any new spec for H&N Restraints on the horizon?
Best regards,
Charles Buren
Safe Drives LLC
www.safedrives.com
cburen at safedrives.com
877-739-1713 toll free
This is my first post on your fine forum. I've lurked for a while though and found this thread linked from the Leatt Brace website. I am the owner of a company called Safe Drives LLC. My company specializes in retailing only auto safety related products. Wherever possible we try to offer only tested and certified safety products. A head and Neck Restraint is a product that meets that criteria.
Originally Posted by gbaker
Aside from that, the spec is perfect.
Mr. Baker, do you know of any new spec for H&N Restraints on the horizon?
Best regards,
Charles Buren
Safe Drives LLC
www.safedrives.com
cburen at safedrives.com
877-739-1713 toll free
#134
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Originally Posted by Safe Drives
SFI 38.1 exists as a standard and many other devices have failed to obtain the SFI 38.1 certification.
As a vendor, what do you think your liability will be when you sell a driver a so-so product just because it has a sticker on it?
Gregg Baker, P.E.
Isaac, LLC
#135
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Originally Posted by Safe Drives
...Mr. Baker, do you know of any new spec for H&N Restraints on the horizon?
Best regards,
Charles Buren
Safe Drives LLC
www.safedrives.com
cburen at safedrives.com
877-739-1713 toll free
Best regards,
Charles Buren
Safe Drives LLC
www.safedrives.com
cburen at safedrives.com
877-739-1713 toll free
How does this affect things? The Leatt Moto-R tests with Fz values in the 2,600N-2,700N range. If the proposal is adopted the Leatt will no longer be "SFI certified".
Gregg Baker, P.E.
Isaac, LLC