MegaTech R/C Real World Helicopter Series Bedienungsanleitung PDF herunterladen (Seite 62)

DESIGN AND BUILD AN RC BIRD MODEL

The tail feathers are built flat on the building

board. Note that the horizontal stabilizer's

leading edge is shaped to match up to the

wing's trailing edge and is reinforced with

He-inch plywood.

Here are the wingtip feathers. They are made

out of He-inch medium balsa. Note the dihedral

added to the first two pairs.

spanwise axis at the wing 1/4 chord (see the

seagull photo).

Kimbrough rotary-drive couplers

eliminate unsightly pushrods and control

horns and minimize control-system slop.

To provide the stiffest possible link, I use a

carbon rod or an aluminum tube for the

torque rod, and I mount the servos as far

inboard in the wing as is practical.

BIRD-LIKE FLIGHT

In general, high-start bungee launches

don't work well for models without rud-

ders or vertical tails. I use a drop-away fin

secured in a slot in the fuselage. The fin

can be attached to the towline so that it

drops off after launch. Slope soaring is

easy and can produce very realistic flights

in light wind. Air launches (drops) from a

powered RC mother ship also work well (I

have made more than 1,000 air launches

to date). This launch method allows for

repeat testing and refinement of the

model. If a tip-aileron-bias feature (tip

feathers) is being used, start with the

aileron leading edge about 1/8 inch below

the wing's leading edge at the end rib.

Move the bias up slowly in flight until

you find that sweet spot where gentle,

coordinated turns are possible. A few

words of caution: tip feathers are easily

damaged. Building stronger feathers (out

of fiberglass, for example) only adds more

1

The front three feathers are movable, while the

rear three feathers are fixed in place on the

wingtip. You can see the carbon-fiber rod and

the brass tube bushing used to articulate the

aileron feathers.

Here, all the wingtip feathers are in place.

A hatch will be added to the opening under

the tip.

weight outboard and moves the failure

points into the primary structure. Wire

tip-skids help some, but my solution is to

use straight-grained 1/16-inch balsa sheet

for the feathers and take some thin CA to

the flying site.

Let's hope these brief comments and

To order the full-size plan, turn to "RCStore.com" on page 130.

92 MDDEL AIRPLANE NEWS

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 74 75

Kommentare zu diesen Handbüchern

Keine Kommentare