The provided document is an instruction manual for the DORNIER DO-27 R/C Flugmodell (R/C Flight Model), designed for brushless electric motors, with an optional conversion for .46-.52 class glow engines. This is a radio-controlled model airplane, not a toy, intended for advanced model aircraft pilots with sufficient experience.

Function Description

The DORNIER DO-27 is a scale model of the Dornier Do 27 aircraft, designed for radio-controlled flight. It is primarily configured for electric propulsion using a brushless motor, but also supports conversion to a glow engine. The manual details the assembly process, from the horizontal and vertical stabilizers to the main gear, electric motor installation, cowling, wing assembly, and final decoration. It also provides crucial information on balancing the aircraft and setting control surface throws for optimal flight performance.

Important Technical Specifications

The manual provides the following key technical specifications:

Wingspan (Spannweite): 1620mm (63 inches)
Length (Länge): 1210mm (47.6 inches)
Electric Motor (Elektroantrieb): Specifications are detailed on the next page (not provided in the current document), but the manual recommends the PICHLER BOOST 60 brushless motor.
Glow Engine (Verbrennerantrieb): 7.5cc 2-stroke / 8.5cc 4-stroke (.46 2-Stroke / .52 4-Stroke)
Radio (Fernsteuerung): 6 Channel / 6-7 Servos
Recommended Electric Power System (for maximum performance):
- Brushless Motor: PICHLER BOOST 60
- Brushless ESC (Regler): PICHLER XQ-70
- LiPO Battery: LEMONRC 3700-5S
- Propeller: 12"x6" - 13"x8"
Center of Gravity (CG): 65-70mm back from the leading edge of the wing, at the fuselage, with the fuel tank empty.
Control Surface Throws:
- Flap: 15mm for take-off, 25mm for landing
- Aileron: 10mm
- Elevator: 10mm
- Rudder: 30mm

Usage Features

The DORNIER DO-27 is designed for advanced model pilots. Key usage features and considerations include:

Assembly: The manual provides a step-by-step visual guide for assembly, covering the horizontal stabilizer, vertical stabilizer, rudder control horn, tail wheel, main gear, electric motor installation, cowling, and wing joining. It emphasizes secure gluing and precise alignment for safe operation.
Propulsion System Flexibility: The model can be powered by either a brushless electric motor or a glow engine, offering flexibility based on pilot preference and experience. The manual specifically details the electric motor installation.
Control Surface Setup: Detailed instructions are provided for installing servos and linkages for the elevator, rudder, ailerons, and flaps. Recommended control surface throws are given as a starting point for successful first flights, with a warning against excessive throws that could make the model difficult to control.
Balancing: Critical instructions are provided for balancing the aircraft, including longitudinal (Center of Gravity) and lateral balance. Proper balancing is essential for stable and predictable flight. The CG is measured with the fuel tank empty.
Flight Environment: The manual explicitly warns against flying carelessly and emphasizes the need for a spacious airfield and safe flying areas. It advises inexperienced pilots to seek professional advice.
Safety Warnings: Repeated warnings are given throughout the manual regarding the importance of securely gluing components to prevent loss of control and accidents during flight. The model is explicitly stated as "NOT a toy."

Maintenance Features

While the manual primarily focuses on assembly and initial setup, some maintenance-related aspects can be inferred:

Secure Gluing: The repeated emphasis on securely gluing components (e.g., stabilizers, hinges) implies that regular checks for loose or compromised glue joints are a crucial maintenance task to ensure the structural integrity of the aircraft.
Covering Maintenance: When cutting away covering for component installation, the manual advises securing the cut edge with CA glue or similar cement to ensure the covering remains tight. This suggests that maintaining the integrity of the covering is important, likely to prevent peeling or damage during flight.
Cleaning: The "IMPORTANT" note at the end of the manual provides specific instructions for cleaning the model: "Please do not clean your model with pure alcohol, only use liquid soap with water or use glass cleaner to clean on surface of your model to keep the colour not fade." This highlights the need for proper cleaning agents to preserve the model's finish and color.
Pre-Flight Checks: Although not explicitly detailed as "maintenance," the instructions for balancing and setting control throws are part of a comprehensive pre-flight check routine that ensures the aircraft is airworthy. Regular checks of these parameters would be part of ongoing maintenance.
Component Replacement: The modular design, with separate components like the main gear, motor mounting plate, and control horns, suggests that individual parts can be replaced if damaged, facilitating repair and ongoing maintenance. For example, the battery seat belt (Akku Klettband) is mentioned as a separate item (Best.Nr. C4739), indicating replaceable accessories.

Nexa DORNIER DO-27 - Page 6

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