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RT4009
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- FIA homologated to 8855-199 standards.
- Available in black, red or blue fabric.
- Suede wear patches to high wear points at shoulders.
- Fibreglass shell construction with a black gel coat gloss finish.
- ( blue, white, yellow or red ) available as special.
- Adjustable or removable cushions from mid back to lower thigh.
- Suitable for road cars or competition use.
- Side mountable with RTB1009M brackets.
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Seats are oversized and bulky. We charge 125.00 flat rate shipping as a result. Our actual shipping costs on seats is usually closer to 200.00.
Some simple philosophies & facts about motorsport crashes.
• If you support the human body well enough in the right places and keep all parts of the body in the same relationship to each other - it can withstand enormous decelerations with minimal or no injuries. 100G is quite survivable.
• Lateral/side impacts cause more injuries than frontal.
• The 4 parts of the body which need this support are the HEAD, SHOULDERS, PELVIS & THIGH
• The body should be stopped as close to the Chassis deceleration as possible.
• Only 20% of body movement in a frontal deceleration is in belt stretch – the balance is body reconfiguration.
• Using a crash recorder in the field, we have measured an 81G lateral impact during use of a Racetech seat in NZ Motorsport. The driver had no injury – and the seat had no damage.
Seat and head restraint advancements
With current technology and availability of seats with side head restraint you would need very good reasons not to use a good Head Restraint seat and a Hans device. The Hans device works 20 deg each side of frontal and the seat does the rest. The current FIA standard require the seat to withstand 20G rearward, 15G sideways & then another 10G rearward. For these advancements to be fully realized, it is essential that the seat and brackets are mounted appropriately.
Seat Brackets and Mounting
The FIA standard requires the seat to be mounted using 5mm thick aluminium brackets, bolted into place with ISO 8.8 bolts. Seats are required to have plates of specific dimension engineered into the seat for fixing. Surprisingly, there is however, no requirement for the seat bracket to match this plate size on the outside of the seat.
Testing has shown us that enormous loads go onto all mounting hardware - and at relatively low decelerations. These loads will bend brackets and pull captive nuts through 3mm steel. In the field we have seen 50mm x 6mm steel plate bend in shoulder mounts. We have seen both small spacers between seats, and bolts with small or no washers pull through brackets. This testing and field analysis proves the need for good mounting practice.
Racetech recommend the use of washers (22mm Dia x 3mm thick) and provides these along with grade 12.9 cap screws. The seat brackets should at least cover an area similar to that of the plate inside the seat (55mm dia) at each bolt point but really support of the full side of the seat is a good idea. We don't recommend spacers but if you need a spacer between seat and bracket then make it at least this size also (55mm Dia). Bolting the bracket to the car is also very important and we don't recommend adjustable seat mounts in rally cars. Again you should use large washers and grade 12.9 bolts. If a seat has no back fixing/support at the shoulder level then we recommend you support the full length of the bracket if possible and use 2 bolts on each side at the front and 1 bolt at each side at the back. It is important the seat is well anchored; the loads in a rear impact are multiplied by the leverage of the length of the back of the seat - if the seat lets go then the belts won't do anything either!
