How to Avoid Dynamic Rollover in Helicopters
What is dynamic rollover?
Dynamic rollover sounds
like a phrase that could be used by the lottery businesses. Each and every
helicopter pilot is mindful that dynamic rollover can be a difficulty when
taking-off or landing a helicopter. Dynamic rollover is caused when a
wheel or a skid on the helicopter turns into attached to the ground and acts
as a pivot point that the helicopter can roll close to. It is significantly more
likely to happen on get-off, and if it is not dealt with appropriately, the
helicopter will roll more than onto its side and get significant harm.
This does sometimes occur to experienced pilots but is significantly more
probably to take place with low time pilots.
Have you ever attempted to pull the
handle of a door and the door refuses to move? Then, when you push the
handle the door opens and will take you by shock. You had been not expecting
it to happen. The same point could happen throughout a take-off. You raise the
collective smoothly and a single of the skids lifts of the ground. You anticipate the other skid to adhere to but unfortunately it is caught on
one thing and refuses to move. Your organic reaction is to raise the
collective additional to make the helicopter break totally free of the ground but
all you accomplish is a quick roll of the helicopter towards the caught skid.
The inertia of this roll could be sufficient to preserve the helicopter
rolling more than even although you now reduce the collective. The inevitable
takes place and the helicopter rolls over unto its side and suffers extreme
injury. The all-natural reaction to raise the collective to right the
problem is the incorrect response and you need to discipline yourself to do the
correct action which is decreasing the collective smoothly till the two
skids are on the ground.
Outcomes
The outcomes of a
dynamic rollover are generally very serious. The helicopter is usually
destroyed. The injury from a helicopter rolling more than at the finish of an
auto-rotation is significantly less than the injury brought on by dynamic rollover.
This is since during an auto-rotation the blades are unpowered and if
it rolls more than, it will rapidly come to rest. Throughout a take-off nevertheless,
you will be using a lot of electrical power and if the helicopter subsequently
rolls over, it will not come to rest so quickly and a lot much more harm
will occur.
Get-off
It can be seen that get-offs may
cause a issue. Icy ground and frozen skids can be a real difficulty.
Muddy or sticky ground, rocks, joints in concrete can all result in skids to
catch and lead to dynamic rollover. Care must be taken in the course of each
consider-off but specifically the initial take-off. Make sure you are looking
well ahead. Raise the collective smoothly until finally you feel the helicopter
get light on the skids. From this stage onwards, you need to move the
collective very slowly. The closer you get to taking off, the slower the
collective must be moving.
Try a little "wiggle" by moving the pedals
slightly. This will give you an indication if each skids are totally free. If
you are on a degree surface, 1 skid will almost certainly commence to rise just before
the other.
It is crucial not to rush the collective at this stage. If
you feel the helicopter is rolling above as well far, smoothly lower the
collective and make sure that both skids are on the ground before
recommencing the get-off. When both skids (wheels) are clear of the
ground, get the helicopter to a secure height to make sure that the skids
do not inadvertently catch on one thing.
Naga303 When the helicopter is on the
ground with the blades turning, by no means consider your hand off the collective
unless of course the collective is fully down and locked. There have been several
circumstances of passengers moving the collective or collectives vibrating
up till the helicopter rolls over.
Creating certain that the aircraft is
inside of its balance limits will also make certain that you do not run out of
cyclic travel during regular get-offs and landings, therefore decreasing the
threat of dynamic rollover.
Further info on this topic could be
discovered at Dynamic Rollover in my helicopter instruction website.