MegaTech R/C Real World Helicopter Series Uživatelský manuál stáhnout pdf (Strana 53)

FMA DIRECT CD-PILDT

on a scale of from one to 10 what the IR

conditions are. Between three and 10

deflections means the unit will operate

properly; two indicates that the unit will

operate but needs its sensitivity increased

over cooler terrain. If the unit deflects only

once, it means there isn't enough difference

in the IR temperature between sky and

ground. It's best not to fly with the unit

turned on.

After step one, the servos begin to cycle

slowly. During this time, you must place

the model on the ground in a level flight

attitude and then walk away about 10

feet. The unit then calibrates itself for

level flight. Once the unit is calibrated, all

you have to do before each successive

flight for the rest of the day is to quickly

check that the unit is working. Turn on

the transmitter and receiver, and point

the model's nose toward the ground. The

unit should provide full up-elevator. Also,

when you point a wingtip at the ground,

it should deflect either the rudder or the

ailerons (depending on which channel

you have the unit plugged into) to correct

the bank angle. After this quick check,

you can launch the model.

AUTOPILOT FLIGHT

The day I tested the unit, I installed it in a

Multiplex Brummi and flew it on a windy

day. From the moment I hand-launched

the model, the unit worked beautifully. As

is normal, to climb, I held up-elevator and

applied full power. When the model was

about 75 feet high, I let go of the control

stick and waited to see what would happen.

The Brummi tracked straight into the wind,

and its wings always returned to level—

even after a strong gust of wind tipped the

wing nearly vertical. After it flew to the

edge of the field, I turned the model to the

right (slightly downwind) and let go of the

controls again. As before, the model righted

itself whenever necessary and maintained a

constant altitude. During the flight, I even

crabbed the model into the wind; it happily

flew slightly sideways as the wind pushed it

along. The wind became rather strong at

this point, so I throttled it back and guided

the model straight into the wind for a land-

ing. The Co-Pilot kept its wings level all the

way to the flare; all I did was adjust the

throttle to control the descent.

On the second flight, I turned the sensi-

tivity down about 1/4 turn and had an

even nicer flight. This time, the wind

Fun Scale

Magnattila

Span 60"

Engines .30-.40 2 str.

.40-.60 4 str.

Radio 4 channel

Weight 5.5 Ibs^,

FLAIR

Texan/Harvard

Span: 66"

Weight: 5 - 7 Ib

Radio: 4 Channel

Engines: .30 - .46 2 str

.40 - .60 4 str

Boeing PT-17 Stearman

Span 89"

(scale 1:4.3)

69"

18-21

180+ 4 strokes

(2 stroke petrol or glow equally acceptable)

Radio 4 channel, 5 servos

Length

Weight

Power

Flair Products Ltd

www. flairproducts. co. uk

Available in the US at:

Radical RC

7046 Harshmanville Road,

Huber Heights, Ohio 45424

Web: www.radicalrc.com.

Email: [email protected]

GCBM R/C Inc.

5009 Fairdale.

Pasadena. TX 77505,

Order line: 800-609-7951.

Fax: 281-998-2529.

Web: www.gcbmrc.com.

Email: [email protected]

Sport Aerobatic

Fabulous Builders Kits,

(33 models in range)

Authentic Vintage Kits,

(36 models in range)

Quality ARTF Kits,

(25 models in range)

and Accessories for all needs.

Dealer enquires welcome

Visit our website to see comprehensive details.

by Hal deBolt

This radical new Co-Pilot stabilization system

reminds me of the first adventures I had with

reed and proportional RC systems. You have to

do two things to make the unit operate properly.

First, be sure that the neutral points on the

model's control surface are properly set before

you install the unit. Then, after completing the

Co-Pilot preflight checkout, you must make sure

that the control settings haven't changed. With

or without the Co-Pilot online, they should be

the same.

The hook-and-loop-fastening material that

came with the unit was a little too spongy for my

taste. It could be compressed and then not

return to its original condition. This lack of con-

sistency made it easy to disturb the sensor,

which caused an alignment problem. Using

either a thinner fastener material or double-

sided servo tape to attach the sensor would

eliminate this problem. The ideal location for the

sensor is out on a wing panel, away from things

that can affect the sensor's view. It is possible

to mount it on the fuselage, but you must make

sure that the landing gear and/or the propeller

do not affect the unit's operation. To properly

control the model, you will have to fly the model

with the unit activated to see if it needs any

fine-tuning. I found that a solidly mounted sen-

sor was difficult to adjust, so I made a simple,

adjustable sensor mount with a ball-link attach-

ment on the fuselage. It is a plywood plate

attached to a ball swivel, which permits infinite

movements. Two adjustment screws allow fine-

position adjustment of the entire sensor unit.

This adaptation worked just fine.

AUTOGYRO APPLICATION

Gyros and helicopters require constant control

attention; a loss of orientation and control close

to earth can be disastrous. It isn't unusual for a

gyro to attain a nose-up attitude without the

pilot noticing the change. I have seen gyros get

to very high altitudes and then drift for a 1/2 mile

downwind because the model's attitude wasn't

apparent to its pilot. If this happens to someone

who is using the Co-Pilot, the system will stabi-

lize the model until orientation is regained. The

Co-Pilot works so well that I have also seen it

control a perfect landing for a gyro that was

practically out of sight. The gyro was hovered at

a high altitude and when the model's power was

reduced, it produced a proper descent that

ended in a no-rollout landing.

On all types of models-fixed-wing, heli-

copters and autogyros-l can say that the

FMA Co-Pilot stabilization system works as

advertised!

76 MDDEL AIRPLANE NEWS

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