PPG 3

PPG 3 - Wheel Launch

Test your PPG 3 Wheel Launch knowledge with this test.

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1. What will increase the risk of tipping/rolling over? (select all that apply)

Having a high center of gravity.

Having a low center of gravity.

Having the wing off centered while using brake inputs.

Turning in the same direction of a wing that is off centered.

Turning in the opposite direction of a wing that is off centered.

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2. A cart with a wider wheel base will have?

More rotational inertia

Less rotational inertia

The same rotational inertia

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3. Rotational inertia is increased by (select all that apply):

Increasing the distance of a mass from its center of rotation

Decreasing the distance of a weight from its center of rotation

Increasing mass

Decreasing mass

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4. What is rotational inertia?

Resistance to changes in rotational speed.

Resistance to horizontal movement of rotating mass.

Resistance to vertical movement of a rotating mass.

Tendency of a rotating mass to reduce rotational rate.

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5. In flight with turbulence, carts tend to:

Swing more (left/right swing) because of increased mass

Swing less (left/right swing) because of wheel drag

Swing left/right about the same as foot-launch

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6. Comparing foot-launching with cart launching using the same motor, the increased drag of the cart will:

Slow the speed and increase the climb rate

Have no effect on speed and reduce the climb rate

Have no effect on speed or climb rate

increase the speed and reduce climb rate

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7. Which statement is true when you use the same wing for wheel launch as you do for foot launch?

The wheel launch configuration will fly faster because of the increased weight.

The wheel launch configuration will fly slower because of the increased drag.

The wing will fly the same speed on both configurations.

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8. Which statement is true when comparing wheel launch vs foot launch?

Carts yaw left/right less than foot launch.

Carts yaw left/right more but at a slower rate than foot launch.

Carts yaw left/right about the same amount and same rate as foot launch.

Carts yaw left/right more and at a faster rate than foot launch.

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9. If the cart is properly balanced, what should happen on takeoff?

The nose/wheel(s) should lift off first.

The nose/wheel(s) should lift off last.

All the wheels should lift off at the same time to avoid a torque turn.

The nose/wheel(s) should lift off last unless you are using full power.

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10. Which statement is true regarding the load-bearing elements (carabiners) on a cart?

The carabiners don't need to be any stronger than the ones used in foot launch.

They must be strong enough to carry the load of the pilot, cart and accessories. (They are usually stronger than foot launch carabiners)

Need to be at twice as strong as those used for foot launch.

They must be strong enough to support the initial inflation of the wing.

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11. Having line holders higher on the cart (check all that apply)

Increases the stress on them during initial inflation

Decreases the stress on them during initial inflation

May make the front lift up at initial inflation, possibly causing a “turtle”

Helps keep the front down, reducing the chance of a “turtle”

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12. On soft surfaces, it may be beneficial to have some slack in the lines. Check all that apply.

This also increases the risk of getting lines in the prop.

There is more chance the cage will flex into the prop as the lines come to tension more abruptly.

There is a greater chance the front wheels will come up at initial inflation.

The wing will tend to come up slower.

This reduces the chance for getting lines in the prop but stresses them more.

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13. If you takeoff with a full tank and land with a nearly empty tank:

You'll land more nose down than when you took off.

You'll land more nose up than when you took off.

This won't affect fore/aft tilt.

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14. Number 6 refers to the center of gravity (CG). Which statement is true?

CG remains the same during the entire flight.

CG moves forward as gas is burned off during flight.

CG moves aft as gas is burned off.

CG moves aft slightly as the front wheel(s) come off on takeoff.

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15. Refer to the illustration. Moving the seat aft (back) will affect takeoff by:

Making the front wheel(s) come off earlier

Making the rear wheel(s) come off earlier

Have no effect on when the wheels come off

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16. Refer to the illustration, 6 is pointing to

Where the cart would balance from when not in flight. (Center of gravity)

Where the cart pivots around while in flight.

Where the cart pivots around at the moment of liftoff.

Where the lift will be generated on liftoff.

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17. Which number is pointing to the pivot point?

1 is pointing to the pivot point (where the cart tilts around)

2 is pointing to the pivot point (where the cart tilts around)

6 is pointing to the pivot point (where the cart tilts around)

4 is pointing to the pivot point (where the cart tilts around)

Your score is

Written Test