|Class||450 size electric|
|Level||Beginner - Intermediate|
|Servo to swash linkage||Direct|
|Drive system||Belt (3mm, MXI, 453t)|
|Tail pitch slider||TODO|
|Tail blade grips||Aluminum|
|Boom strut material||Aluminum|
|Main rotor to pinion ratio||1:10.7 (14T) / 1:9.4 (16T)|
|Main rotor to tail ratio||1:4.6|
|Empty weight||13 oz. (370g)|
|Fully loaded weight||29.3 oz. (832g)|
|Height||eg. 18.3 in. (465mm)|
|Paddle to paddle diameter||INFONEEDED|
|Main rotor diameter||28.46 in. (723mm)|
|Tail rotor diameter||5.9 in. (150mm)|
|Length||25.98 in. (660mm)|
The Beam E4 is a 450 sized electric helicopter which comes in kit form. The frame is made of carbon fibre and polished aluminium, and is shipped with fibreglass blades, a robust thermoplastic canopy and a detailed manual. It is often bundled with a Scorpion ESC and brushless motor.
The Beam E4 has a number of innovative features, including:
- The tail belt runs off a pulley directly above the main gear, reducing drag and noise.
- A one-piece tail box.
- Almost all items can be disassembled for servicing, including a fully serviceable swashplate.
- Under boom gyro mounting plate.
There may be unacceptable amounts of swarf in the threads of aluminum frame parts, particularly in blind holes. If any resistance is felt while inserting screws, it is suggested that the thread be cleaned with gentle use of an M2 thread tap to avoid damage to screw threads and the part itself.
Some early kits had issues with the swashplate ball being too tight; this can be remedied by sanding a small amount of material off the outside (upper/ lower) faces of the plastic cups that hold the ball.
There is an unusually large number of M2 crosshead screws, which are prone to wearing when fastening or unfastening. Many are due to design decisions leading to insufficient clearances for cap head screws.
The following items are likely to break in a crash
- Airframe weight: 335g
- Stock blades: 55g
- Stock canopy: 42g
- Total : 432g
- Main gear: 150 tooth, 0.5 module
- Tail gears: 51 tooth drive, 11 tooth driven.
- Tail belt : 453 tooth?, MXI.
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