Presentation MIM Construction AB Mats Bjrnetun 2016-02-05 Use of - - PowerPoint PPT Presentation

Presentation

MIM Construction AB Mats Björnetun 2016-02-05

Use of MIMSAFE SYSTEMS

• Where?
• When?
• Why?
• How?

Where?

• Course Designers choice

When?

• Increased risk of short duration rotation

Why

• The timing aspect
• The mindset aspect
• The chance to react aspect

Rotation - Demolition

Rotation

Jumping curve is upwards at first hit Horse is close to fence One major hit create the rotation Rider follows the horse Time between hit on the fence and ground contact is short Rotation is straight forward More likely to give serious rider injuries

Demolition

Jumping curve is downwards at first hit Horse jumps of too early Demolition can go over in rotation Rider separates from the horse Time between hit and ground contact is often longer If a rotation it is in any direction More likely to give serious horse injuries

Behavioral Science of the Rider

• Calculated Risk or Opportunity?
• Only way to win is forward

Behavioral Science of the Horse

• Energy Conservative (Calculated Risk)
• Survival Instinct

Mindset

Townend fall at Lexington ”Fast rotation”

Chanse to react

• No chance of improvement from rider
• Normal athlete reaction time is 0.5-0.8 sec
• Fence Contact Phase important to prevent fast

rotation

• Contact forces needs to be lowered to

decrease rotational speed

How

• Lower contact forces
• Shorter contact time
• Optimized force direction

The horse is traveling forwards and upwards while approaching the fence.

Principal rotational fall

At this point the horse impacts the fence and all major forces acting on the horse have the

• pposite direction as the speed of the horse.

The speed of the impacting legs quickly slows down and stops. Coming in too low the legs get trapped in front

• f the pole.

CoG

As the ligaments stretches the forward speed translates into a rotational speed. The rotation itself takes time to develop and the forces acting on the horse will be considerably lower when the rotation is visible. The horse keeps moving forward. CoG

Force acting on horse By this time the rotation has developed and the rotational speed will only increase with gravity. If the

• riginal speed of the horse was not

extremely slow the increase will

• nly be a fraction of the total

rotational speed. There is no return as the horse will continue its rotation until it hits the ground. CoG

At this point the horse starts bending its neck to the side to protect its head and neck.

The horse hits the ground.

Gravity at 300m/min

Time (Hundreds of a second)

The horse is traveling forwards and upwards while approaching the fence. Hinge

Principal recoverable fall

At this point the horse impacts the fence and all major forces acting on the horse have the

• pposite direction as the speed of the horse.

The speed of the impacting legs quickly slows down. Hinge

Rotational Speed The fence is driven forwards together with the impacting horse. As the fence rotates around a hinge its speed forward shifts into a speed towards the ground. As the legs are never completely trapped the rotational speed is reduced compared to a non breakable fence. Hinge

The horse will have a good chance to recover from the would-be dangerous rotational fall. The total rotation of the horse will only be a fraction compared to a non breakable fence. Hinge

The horse has not interpreted the obstacle in a correct way and ends up landing down into the

• fence. There is a relatively long period where

both horse and rider feels the mistake. This makes the rider less reluctant to stay on the horse when it loses its

• balance. The risk of having

a fast rotation where the rider gets trapped underneath the horse is less than when the rotation starts while traveling upwards approaching the fence.

Demolition fall

Energy at 300m/min

• At the low speed 300m/m or 5m/s the energy is equal to a center of

gravity fall down to the top of the fence of 1,25m. The fall of a horse into a fence like that is almost impossible, the actual center of gravity fall distance before reaching the top of the fence is much less than 1,25m and could be accounted to demolition falls.

• If the center of gravity fall distance from the top of the jump curve is

0,25m before reaching the fence the fall energy level is 20% of the forward traveling speed energy.

• Thus using a vertical energy to take away the total energy to prevent a

rotational fall is to sub optimize the use of frangible fences.

• Statistics show that often there is no fall energy at al before hitting the
• fence. The jump curve is still moving upwards.
• A recommendation is to use the, in most cases, more than five times

higher horizontal energy to activate the frangible fence. (Notes from Anders Flogård, MIM Construction)

Rotation - Demolition

Rotation

Jumping curve is upwards at first hit Horse is close to fence One major hit create the rotation Rider follows the horse Time between hit on the fence and ground contact is short Rotation is straight forward More likely to give serious rider injuries

Demolition

Jumping curve is downwards at first hit Horse jumps of too early Demolition can go over in rotation Rider separates from the horse Time between hit and ground contact is often longer If a rotation it is in any direction More likely to give serious horse injuries

MIM Post&Rail-kit ”Generation 2”

Function

• Function is limited to horizontal

release.

• Solid from vertical force,
• Using MIM Clip with indicator

”gives correct judging” and no risk

• f unexpected release.

MIM Post&Rail kit ”Generation 3” (stabilizing offset)

Function

• Function is limited to horizontal

release.

• Totally solid from vertical force
• Using MIM Clip with indicator

”gives correct judging” and no risk

• f unexpected release.
• Allow the ”horse to slide over”

without release that results in 21 penalty points.

Usefull for:

• Fence into water
• Coffin (first element)

MIM Table-kit ”Generation 3” (stabilizing offset)

Function

• Function is limited to horizontal

release.

• Totally solid from vertical force
• Using MIM Clip with indicator

”gives correct judging” and no risk

• f unexpected release.
• Allow the ”horse to bank”without

release that results in 21 penalty points.

MIM Wall-kit ”Generation 3” (stabilizing offset)

Function

• Function is limited to horizontal

release.

• Totally solid from vertical force
• Using MIM Clip with indicator

”gives correct judging” and no risk

• f unexpected release.
• Allow the ”horse to slide over”

without release that results in 21 penalty points.

Usefull for:

• Fence into water
• Coffin (first element)
• Trippel brush (third brush)
• Gate
• Wall

”Generation 3” (stabilizing offset)

WALL Post Negative Offset

125mm or 5”

Reversed pin ”Generation 2”

Function

• Horizontal to vertical release.

Traditional pin ”Generation 1”

Function

• Function is limited to

vertical release.

• Totally solid from

horizontal force.