Toggle Sidebar
Photo Albums
(2) View All
Mutual Friends
( 0 )
  • No mutual friends currently
Events
(0)
No events found.
Photos
(2) View All
Recent updates
  • Post is under moderation
    Purley accident report #1977 #Silverstone / #LEC-Refrigeration #LEC

    Peter Jowitt, the #RAC ’s expert Accident Commissioner, has completed his investigation into the causes of the appalling accident which befell poor David Purley during qualifying for the John Player #British-Grand-Prix . Jowitt concludes that the accident — which he describes as ‘the most severe known accident’ — was caused by a jammed throttle slide, and found that the actual cause of this was very unusual.

    Jowitt’s full report reads as follows:

    1. Towards the end of the pre-selection practice session for the British Grand Prix, the Lec #Formula-1 car driven by #David-Purley was involved in a major accident. The car cut across the apex of the comer at Becketts, ran across the infield, recrossed the track, went through five catch fences, and hit the earth bank-backed sleeper fence at very high speed, in an almost head-on impact. The chassis of the car was virtually destroyed, complete destruction going back as far as two feet from the seat bulkhead.

    2. An immediate inspection of the car showed the following evidence:
    The front tyres were not flatted, but the rubber indicated that they had been travelling at an angle to the direction in which they were directed. The tyres were all inflated except the front left, which wheel had considerable distortion due to the impact.

    The throttle slide was in the wide- open position.
    The tachometer was stopped at 6000rpm.
    The car was in 5th gear.
    The brake reservoirs were badly damaged, bur still held some fluid.
    The brake pedal linkage, although distorted, was intact, with all pins and pivots in position.
    The steering linkage anchorage to the left front wheel was broken, due to impact, but the steering was otherwise intact, and the rack was operable.

    3. The driver was still trapped in the wreckage at this point, and he was heard to mumble that ‘the brakes had gone spongy'. His six point harness was intact, and had to be cut to release him. It should be noted that releasing the driver was a task done with extreme care and professionalism, and the marshals and medical staff cannot be praised too highly for their part in the operation.

    4. Away from the accident scene, an examination was made of the rubber marks left by the car. These were from the front tyres, and showed a gentle right curve from the left hand side of the track entering the corner, across the track, across the infield kerb, across the infield, across the far infield kerb, across the track, and on to the grass. The total length of rubber marks was 155yds, with the right hand track being slightly shorter than the left. The right hand track showed the wavering edge sometime seen when a tyre deflates and loses wall stability, but the braking from this tyre had been so hard that it had plucked stones from the rather poor tarmac covering the infield of the corner, so that any idea that the tyre had deflated could be discounted, a fact further confirmed by the examination of the car.

    5. The tachometer was of the chronometric type, and would indicate the speed of the engine at the split second before it stopped. 6000rpm in 5th gear would give an impact speed of approximately 110mph, and the severity of the damage to the chassis would tend to confirm this. The braking marks indicate a braking effort of about 1.5g, and working back over the 155yds of the braking distance, this would give a speed at the start of braking of 180mph. which is manifestly impossible at this pan of the circuit. The inference is that the car was being driven on by its engine whilst the brakes were hard on, almost certainly due to the throttle slide sticking. There is some confirmatory evidence for this possibility.

    David Purley — stuck throttle.

    6. Earlier in the day, a pipe in the fuel injection system had spilled fuel, which caused a small fire on top of the engine. This had been doused by dry powder extinguisher, and I personally observed the very diligent efforts made by the mechanics to clean the engine afterwards, using air hoses and a vacuum cleaner. When the air slides were stripped after the accident, the small rollers were found to have flats on them, and traces of a hard, white, cement-like deposit were found. This was shown by subsequent experiment to be the dry powder extinguisher, which had combined with the gasolene present to make this hard deposit, a thing never before noted.

    7. Additionally, another driver, Mike Wilds, was standing on the infield at Becketts Corner, and he describes the car as coming across the infield with a lot of right lock on the steering, and with a lot of engine noise, indicating to him that there was more power coming from the engine than one could reasonably expect at this point.

    8. The inference must therefore be that although the throttle slide was found to be free after the impact, a throttle jam, very probably due to the unexpected combination of dry powder and gasolene, and despite very thorough cleaning, was the cause of this accident. I feel that the attention of competitors must be drawn to this very dangerous potential accident cause.

    9. All the safety measures appeared to have worked well. The driver's helmet had been scraped quite severely by the catch fences, but there was no evidence that any damage had been done by the poles. The accident was an extremely severe one, and it seems probable that the speed knocked off by the fences was crucial to the driver's survival. The harness was not destroyed, and the mountings were not strained. So fuel was spilled, and the foot-box, although severely displaced, slayed reasonably intact. To David Purley, the record of having survived the most severe known accident now passes. Had the safety measures not worked, there is little doubt that he would not have survived.

    10. The main lesson to be learned from this accident is that unexpected factors, such as the combination of dry powder and gasolene, can still undo the most carefully thought out survival measures but we are at least improving.

    David Purley, of course, was severely injured in the accident, and at present he is on a long road to recovery in Midhurst Hospital in Sussex.
    Stream item published successfully. Item will now be visible on your stream.
  • Post is under moderation
    bavino
    bavino is now friends with CitroMan
    Stream item published successfully. Item will now be visible on your stream.
  • Post is under moderation
    CitroMan
    CitroMan is now friends with PaulDoherty
    Stream item published successfully. Item will now be visible on your stream.
  • Post is under moderation
    Original paint #1985 #Citroen #CX #GTi #Turbo series 1
    Stream item published successfully. Item will now be visible on your stream.
  • Post is under moderation
    CitroMan
    CitroMan is now friends with Eric Richardson
    Stream item published successfully. Item will now be visible on your stream.
  • Post is under moderation
    CitroMan
    CitroMan replied to the discussion, Before you buy Jaguar E-Type
    • 344 Hits
    • 1 Replies
      Replied on Wednesday, 28 January 2015

    look great!

    Stream item published successfully. Item will now be visible on your stream.
  • Post is under moderation
    CitroMan
    CitroMan joined the group Jaguar E-Type owners and fun club
    Stream item published successfully. Item will now be visible on your stream.
  • Post is under moderation
    Very rare m #Citroen CX Prestige - Series 1 Fase 1 #1979 with all chrome exterior and manual gearbox. All original, even stereo system. #M23 engine with Bosch fuel injection - 128bhp
    Stream item published successfully. Item will now be visible on your stream.
  • Post is under moderation
    love this
    Stream item published successfully. Item will now be visible on your stream.
  • Stream item published successfully. Item will now be visible on your stream.