The 3W 28i engine is supplied together with UAV Factory’s proprietary 80W onboard generator system. The generator system is factory installed on the 3W 28i engine and tested before delivery.
The two-stroke 3W 28i engine is a proven choice for unmanned aircraft vehicles due to excellent power-to-weight ratio and reliability. The 28i engine is available in both pusher and tractor versions. It is also possible to order 3W 28 CS engine, which offers higher power output.
The 3W 28i engine and generator system is often used for unmanned aircraft vehicles with the takeoff weight of 8 to 23 kg.
The following items are included in the 3w 28i engine and generator system:
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3W 28i (or 28 CS) engine. Pusher or tractor engine versions are available
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Ignition unit
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Preinstalled 80W onboard generator system
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Generator Power Unit
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Wiring with Fischer push-pull connectors installed
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Two level anti-vibration engine mount (optional)
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Hitec digital throttle servo and linkage (optional)
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Product Specification
Engine Specifications:
|
PARAMETER
|
VALUE
|
|
Engine model
|
3W 28i or 28 CS, two stroke
|
|
Power
|
3.35 hp (28i) or 3.55 hp (28 CS)
|
|
Capacity
|
28 cc
|
|
Speed range
|
1500-8500 rpm
|
|
Oil / Gasoline Ratio
|
1:50 / 2% mix
|
|
Recommended 2-bladed Propellers
|
16x10, 18x8, 18x10, 20x8
|
|
Recommended 3-bladed Propellers
|
16x8, 16x10
|
|
Engine weight ( including ignition)
|
1.2 kg
|
|
Muffler
|
Not included
|
Electrical Specifications:
|
PARAMETER
|
VALUE
|
|
Generator type
|
Brushed
|
|
Generator voltage range
|
13 – 50 VDC
|
|
External power supply voltage range
|
13 – 50 VDC
|
|
Battery Type
|
3 cells Li-Polymer (not included)
|
|
Battery Voltage
|
12.6 V
|
|
Maximum battery charging current
|
2 A
|
|
Maximum continuous generator current
|
3.5 A
|
|
Maximum continuous battery current
|
8 A
|
|
Maximum continuous external power current
|
8 A
|
|
Output voltage
|
6 V and 12 V
|
|
Maximum output voltage ripple
|
50 mV @6V 50 mV@12V
|
|
Continuous load current, 6 Volt output 1,2
|
5 A
|
|
Continuous load current, 12 Volt output 1,2
|
5 A
|
|
Maximum GPU efficiency
|
90 %
|
|
Maximum total generator system efficiency
|
75 %
|
|
Maximum peak load current
|
10 A for 10 seconds
|
|
No load GPU current
|
110 mA
|
|
Tachometer range
|
1000-9000 rpm
|
|
Tachometer accuracy
|
200 rpm
|
|
Current sensor range
|
0 to 10 A
|
|
Current sensor accuracy
|
0.2 A
|
|
Voltage sensor accuracy
|
0.1 V
|
|
Serial Communication
|
5V TTL
|
Generator System Mechanical Specifications:
|
PARAMETER
|
VALUE
|
|
GPU Dimensions
|
59.4 x 115.8 x 32.4 mm
|
|
GPU Weight
|
~190 grams
|
|
Complete Onboard Generator System weight
|
~500 grams
|
|
Maximum GPU enclosure temperature
|
70°C
|
|
Environmental protection
|
IP 64 standard, IP 68 on request
|
|
Operating temperature
|
- 40°C to +50°C 2
|
|
Electrical connectors
|
Fischer 104 Series push-pull connector
|
1 Generator continuous current must not exceed 3.5 A
2 Enclosure temperature must not exceed 70 °C , additional cooling may be required
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