Beam E4
From RC Helicopter Wiki
| Beam E4 | |
|---|---|
 | |
| Manufacturer | Beam |
| Class | 450 size electric |
| Build | Kit |
| Blade size | 325mm |
| Level | Beginner - Intermediate |
| Frame | |
| Material | Carbon fiber |
| Type | One piece |
| Servo to swash linkage | Direct |
| Servo size | Micro |
| Rotor head | |
| Grips | Aluminum |
| Head block | Aluminum |
| Links | Ball |
| Swash | Aluminum |
| Control | CCPM 120° |
| Tail | |
| Drive system | Belt (3mm, MXI, 453t) |
| Auto driven | Yes |
| Tail pitch slider | TODO |
| Tail blade grips | Aluminum |
| Tail case | Aluminum |
| Boom strut material | Aluminum |
| Gearing | |
| Main rotor to pinion ratio | 1:10.7 (14T) / 1:9.4 (16T) |
| Main rotor to tail ratio | 1:4.6 |
| Weight | |
| Empty weight | 13 oz. (370g) |
| Fully loaded weight | 29.3 oz. (832g) |
| Dimensions | |
| Height | eg. 18.3 in. (465mm) |
| Canopy width | INFONEEDED |
| Landing gear | INFONEEDED |
| 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.
Contents |
[edit] Known issues
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.
The design of the tail box has been changed, with the bearing retaining screws now on the same side as the tail rotor, not as shown in the manual.
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.
Consider using one of the longer threaded pushrod to tap the inside ball links going from the blade grip to the Bell-Hiller mixer.
[edit] Crashes
The following items are likely to break in a crash
- Flybar;
- Main blades;
- Mast;
- Main drive pulley (tail belt drive pulley);
- One-way sleeve;
- Main gear.
[edit] Other statistics
- 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.