HAND PROPPING
Acknowledgemts: EAA Chapter 1000
Hand-propping is like stalls and spins - you don't learn much by simply
talking about it ... PROP-SWINGING is a manual skill, and it should be learned by
actually doing it, under the guidance of an already qualified and experienced person - it
can't be learned by reading this thread. All we can do is to give some pointers which
might help.
The main thing with swinging, is that it’s DANGEROUS. Propellers KILL, so the procedure you use must be
designed to minimise exposure to risk as much as possible. But the
risk can NOT be eliminated. The golden rule is the same as for
anything else to do with flying - if in doubt, chicken out. There are basically
2 ways to do it - from the front or from the back.
Preference is front, but whichever you choose:
· AVOID propping alone whenever possible. Whilst there may
be nothing forbidding it, it is inherently unsafe. The last thing you want is your
airplane without a pilot and with the throttle open too wide tooling across the
airport!
· ENSURE that the airplane is CHOCKED and BRAKED. The chocks are essential to saving
the life of the ‘swinger’, as they stop the airplane chasing him!
· AVOID using more than idle throttle settings while hand-propping.
Even flooded airplanes will start eventually with the throttle at idle.
· ENSURE good signals from cockpit to ground.
Do not turn the prop unless you are both absolutely
clear about what is happening. The
'swinger' is the boss! Your helper should keep their hands in plain sight of
you before you go near the prop. Their instructions should include not touching
ANYTHING while you are holding the prop!
· ENSURE that you stand close enough to the
prop. Stand close and pull your body away as you swing. This moves your whole body in the
right direction. Standing away causes you to lean in and finish with your head low
leaning into the prop!
· AVOID wrapping your whole fingers around the blade. Wrap to the first
knuckle only - you will need that one knuckle's worth of grip to do anything
useful. Do not wrap your thumb around the blade at all. This is to allow the blade
to fly out of your hands if the engine backfires.
· ENSURE that no part of your body can ever enter
the path of the prop blade at any time - not an arm, not a leg, NOTHING except
the tips of your fingers - one knuckles worth.
· AVOID turning the blade through to loosen the engine. If
you must loosen a very cold engine, treat everything as though the
mags are hot and the engine has fuel. Go through
EXACTLY the same motions as when you really intend to start the airplane.
· ENSURE that you stand about a foot back
from the prop, with your left leg forward, and pull down with both hands. Don't
pull hard - it's very unlikely you'll be able
to raise enough momentum to get through more than one compression stroke, which
is all you need anyhow. Pulling too hard will upset your balance.
· ENSURE follow-through on your downward pull by
letting your arms continue down and slightly to the
right, to get your arms and the rest of your body headed away from the prop.
· ENSURE that you call “mags
off” after a failed start and get a response before moving the blade to the ready
position.
· ENSURE that you move quickly to the side
and out of the plane of rotation when the engine starts, so
that your helper can see you, and so that you do not accidentally walk into the prop.
Much of the procedure is reliant upon inter-person communication,
strictly laid down so that each person knows what the other is doing. It DOES require trust, especially
on the part of the ‘swinger’, but with that trust, knowledge and training you
should succeed in the objective of minimising the risk.
FLY SAFE!