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Recent content by Rat5

  1. Rat5

    Riveted joints / structures

    Hello rb1957, thank you for your answers, that is very helping. can you recommend me a few books on the subject ? yes bonding beads, i dont know the real name in english, they're calibrated glass balls you mix with the adhesive, they limit how thin the adhesive can go. thanks again
  2. Rat5

    Riveted joints / structures

    Hi, i have a few questions about the riveted joints that hold a aircraft together : -Does the rivet retain axial preload from being bucked ? if yes how to calculate the value ? -Does a riveted joint provide strength from the friction between the 2 sheets jointed together and normal load on...
  3. Rat5

    Riveted chassis and FEA

    Hi, How would one go about modeling riveted joints of a riveted aluminium sheet monocoque on Solidwork FEA ( or another ) ?? should i use bolts, or simplify by juat surface contact and clamping force ? If yes how do i calculate clamping fprce of a rivet ? Thank you
  4. Rat5

    Fabricated crankshaft, racimg motor, viable option ?

    Is a fabricated crankshaft a viable option for a turbo racing engine ? (4 cylinder / 2 litre / approx 800Nm ) By :fabricated" i had in mind : Bored plates that act as throw/counterweight and the pins and mains would be pieces of round stock, all press fitted together and welded, by tig...
  5. Rat5

    Compound turbochatging / wastegates

    Very true, but most compound systems have wastegate to bypass the HP turbo usually, they never dump them to open air. Hence why i asked what made it different case here
  6. Rat5

    Compound turbochatging / wastegates

    Hello, I came across this video of THailand drag trucks. They use compound turbo systems. However, it seems that they dont reintroduce HP wastegates outlet before LP stage. (wastegate on collector, before small HP turbo dumps to open air) Is there a strategic reason behind this ? To me...
  7. Rat5

    1980s F1 Fuel, Toluene Diesel blend

    Hello, I know they used Toluene and like 30% Diesel, Why diesel ? Some say it is to slow down combustion butbi dont believe it is that, and it would not be beneficial to do this. I think it was done to lubricate the mechanical injection system.
  8. Rat5

    Spring preload and load...

    Hello, can someone explain me something i struggle a bit with ? Lets assume a spring / mass system (like the corner of a car ) If i have a linear spring, with 10kg/mm and i put 300kg of preload, the spring will be compressed 30mm. Now lets assume the corner of the car is 400kg, when you...
  9. Rat5

    Cooling system design, mass flow rate ?

    Hello, Anyone have a good method or book/sae paper suggestion on how to calculate required coolant mass flow rate and radiator area ?
  10. Rat5

    Effect of rebound dampening on jumping vehicle ?

    Hello Brian, thanks gor the reply. Yes i do understand the concept of packing, but i was more interested in the single big jump situation.
  11. Rat5

    Effect of rebound dampening on jumping vehicle ?

    Hello, What effect does rebound damping have on a vehicule taking a jump ? (MotoX or trophy truck for example ) In my opinion, little rebound damping (faster rebound) causes the vehicle rear to ride high, because the action of the wheel going down will equally push the vehicle up, correct ...
  12. Rat5

    Turbo inline 4, exhaust design sound

    Thanks for the replies, Greg, where would these Mach 1 pulses occur withing the egine ? Exhaust ports ? Or within the turbine ?
  13. Rat5

    Turbo inline 4, exhaust design sound

    I always wonder why, turbo inline 4 can sound so different , Like these for example have a "smooth sound" if i can say https://youtu.be/wWr1uGbhAP8 While some have that particuliar aggressive sound that reminds of a subaru https://youtu.be/tMjALs931aE https://youtu.be/jjeBJd6ZynA I would...
  14. Rat5

    Engine testing, boosted air supply control

    Hello I was watching this F1 documentary where they show an engine on the dyno and they use an industrial compressor to provide boosted air What kind of control strategy would be used here for pressure control ? Starts at about 12 mins in https://youtu.be/xbB1qwhKaaE
  15. Rat5

    FWD Vehicule caster

    Brian, i was tanking the example of the E30 and E30IX. The IX strut towers are much more towards the front than its rwd counterpart
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