MegaTech R/C Real World Helicopter Series Uživatelský manuál stáhnout pdf (Strana 18)

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Norvel

Thunder Tiger

AME.Q49(CL/RC)

AME .061 (CL/RC)

BigMiG Sport .049 (CL/RC)

BigMiG Sport .061 (CL/RC)

BigMiG Sport .074

WEIGHT (0Z.) DISPLACEMENT

1.69/1.831

0.05

1.69/1.83 t

1.69/1.83?

1.69/1.83 t

2.65

0.05

0.07

THROTTLE PRICE

$39.95

Fuji

Norvel

.099 RC aircraft engine

BigMiG Start'Up .049

BigMiG Start'Up .061

4.32

2.39

0.10

0.05

0.06

$149.99

$49.99

$45.99

$55.99/$75.99

$45.99/$59.99

$34.99/$59.99

$75.99

t Weight includes muffler * Available in both control-line and RC versions

1/2A ENGINES & NITRO CONTENT by Dave Gierke

House of Balsa Is known for Its high-quality,

fine-scale V2A kits such as this 36-inch

Beechcraft Bonanza; $59.95.

House of Balsa Super Decathlon: $59.95.

This Cox Babe Bee Is typical of

the classic 1/2A and free-flight

engines. It has no throttle and

does not require a dedicated

RC channel. The engine mount

also serves as the fuel tank

and the carb; after the needle

Is tuned for the desired rpm,

the engine will operate at a constant speed.

Price: $47.29.

1/2A glow engines that operate

on methanol- (alcohol-)

dominated fuel have a

problem-they're

tremendously over-cooled! In the late 1940s, the newly developed "baby

engines" barely ran on glow fuel that was formulated for larger displacement

engines. Containing mostly alcohol, castor oil and a bit of nitromethane, this fuel

was inadequate for the new breed of tiny engines. They protested

by being difficult to start and touchy to adjust, and they ran ,

roughly. The difficulty turned out to be the surface area of

the cylinder and head when compared with the cylinder dis-

placement; this important ratio is much larger for

small engines than it is for large engines. Look at

these examples of displacement versus cylinder sur-

face area. An .049 has a ratio of 13:1, a .40's is 6:1,

and a 1.2's is just 4:1. The solution? Add

nitromethane to the fuel; between 25 and 35

percent works well.

Thunder Tiger

GP-07;

$49.99.

House of Balsa P-51 Mustang; $59.95.

The Norvel Big (WIG Sport

.074 ($75.99) is one of the

newer generation of

throttleable 1/2A engines. It

operates much like any

larger RC glow engine; a

channel is assigned to con-

trol a servo that moves the

As we know, nitro throttle position on the carb.

adds power and heat to the operating cycle of any engine.

Additional nitro allows the temperature of the crankcase to

increase and provides needed thermal energy to vaporize liq-

uid fuel components before transferring them to the cylinder

for combustion. Vaporized fuel does a better job of mix-

ing with air and burning than do liquid droplets in an

over-cooled engine.

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