Reply With QuoteWe cut open an SRS module from a D2 and the deceleration device is as simple as a spring and a contact - fail safe scenario
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This is then backed up with all sorts of electronics, buy the sensor is simplicity itself.
Erich
Master
Further positive of non deployment....
Not having a high speed full facial of that white powder that gets everywhere!!!
ChatterBox
We cut open an SRS module from a D2 and the deceleration device is as simple as a spring and a contact - fail safe scenario
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This is then backed up with all sorts of electronics, buy the sensor is simplicity itself.
Erich
Master
Sort of makes a crock of the ADR's with regard to to bullbars on a D2.
cheers
Nick
Master
So with this information what is to stop you from having a body lift if there are no sensors in the front of the vehicle to be affected?
Sort of highlights your misunderstanding of the engineering behind the chassis and "crash pulse" scenarioOriginally Posted by Hastykiwi
Flex between body and chassis dynamics.
Master
How do you figure that? ADR's state that bullbars cannot reduce or impair the safety features of a vehicle. Assuming your still using the crush cans, whats the problem?
cheers
Nick
Factory crush can + bar has a set 'crumple rate'
ARB bar construction + their crush cans must match that rate.
Tjm bar must meet same rate.
A non-tested bar, even using one of the above manufacturers crush cans may still have a different rate in an impact.
Master
Fair enough mate, I just get the feeling that the vehicle will still crumple the same behind the bar, the SRS will still work, if only a little more sensitively, and considering the ADR's don't give a toss about bars on non SRS, vehicles, ie D1's Defenders etc, its got nothing to do with crumple zones etc, but simply ass covering.
cheers
Nick
I know what your saying Nick...
Try to think of it like this...
I'm going to hit you in the chestwith a sledge hammer
Your chest is the constant (like the chassis on the D2) and you now have a choice of the following items to place in front of your chest before I hit you...
1) A solid block of wood
2) A block of wood with a pile of hard foam attached on the side that sits on your chest.
Which would you choose?
Both will stop the sledge hammer from penetrating your rib cage but one is going to remove a lot of the impact and dissipate the forces before it cracks your sternum.
By dissipating the impact, the force transmitted through your body is less.
In the case of the D2 SRS system, this means one of two things happen.
(1) The force still exceeds the trigger point for SRS activation, and the bag deploys at the correct time (this is critical) > the bag needs to be fully inflated just before your body hits it... You dont want the airbag going off too late or early.. especially you dont want it hitting you whilst under inflation - it can snap your sternum, can break your nose and jaw (seen it). You'll also find you get very sore wrists!
(2) The crush cans and bar dissipate a large amount of force and the resulting deceleration force is < the trigger point and the bags dont fire..
This is IMHO much preferable
For the record - People, look at your brides etc.. If they are small stature be careful they dont sit too close to the steering wheel. I see this so often, women especially sitting way to close to the steering wheel.
In an accident, they are going to suffer huge injury just from the SRS system. (Have witnessed this also) Resulting injuries were cracked sternum and ribs, broken nose and eye socket... all because the bag was inflating at time of impact and because driver was within the expansion area of the bag.
It is documented that the explosive force of an SRS airbag is similar in energy to a military Claymore
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