Moyes Sonic Specifications download pdf (Page 19)

SONIC OWNERS MANUAL

Version 1.01 17

In windier conditions, hold the glider at the angle of attack that allows the wing to

generate maximum lift without stalling or causing wing balance problems, but at the

same time allows you to stand comfortably without being lifted or holding any glider

weight.

If wire assistance is available, have them hold the front and side wire, but ensure you

have advised them of what you require and what your commands will be. Never attempt

a take-off if the wire person has not let go of the side wire or if they have not “cleared” to

a position that is safe from interfering with your take-off. If they are either pulling down

or lifting a side wire it means the wings are generating uneven amounts of lift and you

must reorientate your wings until the wire person has “no weight”, and you can hold the

glider alone ready to take-off.

Likewise on the front wires, do not attempt to launch until the wire person has “cleared”

and you are able to maintain total pitch control alone.

In Flight

You will soon notice how little effort is required to control the Sonic. While this was one

of the design requirements for the model, you may find that unless you fly in a smooth,

accurate and relaxed fashion this quickness of response may create a few problems for

the tense and jerky pilot.

Glider Trim and Speeds to Fly

During the test flights for your Sonic, the factory test pilots will have set the hang loops to

trim the glider’s speed at a few miles per hour above stall speed and it is at this speed

that the glider is most easily controlled.

Slowing down from this point to minimum sink speed will not reduce lateral control to any

noticeable degree, and even beyond this towards full stall, the glider will maintain

directional controllability. However, by pushing out this much, the glider will have

entered a parachuting mode due to the greatly increased drag and a lessening of lift and

is unlikely to be of any value in terms of efficiency.

Stalling the Sonic will result in a variety of predictable behaviours depending on how the

stall is initiated. If it is approached gradually, as described above, the glider will show

very little tendency to drop through, (ie. drop the nose automatically to regain flying

speed) and as a result, the inexperienced pilot may have difficulty in recognising the

initial stages of the stall. Therefore, close attention should be paid to the maintenance of

air speed through the feel and sound of wind on the face as well as the position of the

control bar relative to its trim position, and any increase of “back” bar pressures. If

however the stall is initiated more suddenly, a definite “back” bar pressure should be

noticeable as the glider loses lift forward of the centre of gravity more rapidly. Holding

the bar out beyond this point will result in a quite dramatic nose drop and/or slip off to

one side. Stalling in a turn or on a bank will cause the stalled wing to lose lift and drop

into the turn while at the same time the glider will yaw around following the direction of

the turn until the nose has dropped sufficiently for air speed to be regained. Once again

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Moyes Sonic Specifications Page 19