Loop D Loop
- Thread starter wysiwyg
- Start date
but it wasn't done in the UK so it doesn't count apparently.
noooo...what im saying is im going to the shoot next week, am i going to die trying to do the loop?
bring it onnnnnnnnnn 
*hand in the air* I expect to die
Which is better for this ****, a hardtail or a full sus? I'm guessing hardtail for the loop but there'll be loads of drops and stuff too...
anyone have a figure on the size of the loop so i can calculate the required velocity to not **** it up?
*hand in the air* I expect to die
Which is better for this ****, a hardtail or a full sus? I'm guessing hardtail for the loop but there'll be loads of drops and stuff too...
anyone have a figure on the size of the loop so i can calculate the required velocity to not **** it up?
I've heard that lots of people go to fast and then get crushed by the G's (i.e. lose control)
mg == mv^2/rOriginally posted by - seb
I think my maths must be way off here, for a 7ft radius loop I reckon you only need to be doing 23mph? Anyone care to check
==> g == v^2/r
==> sqrt(r*g) == v
substitute r = 1.8m, g = 9.8m/s^2 and we get 4.2 m/s, or 9.5 mph. so we have to be going 9.5 mph at the top of the loop. how fast must we be going at the bottom of the loop then? add in potential energy:
KEatstart == KEattop + PE
1/2 mv^2 == 1/2 m(4.2m/s)^2 + mgh
==> v^2 == (4.2m/s)^2 + 2gh
substitute g = 9.8 m/s^2, h = 3.6m and we get, ignoring units for a second:
==> v^2 == 17.64 + 70.56 == 88.2
==> v == 9.4 m/s, or 21mph.
conclusion: i basically agree with you