KAVAN Bristell B23 1600mm - Instruction manual

Introduction

Congratulations on your purchase of the semi–scale model of the Bristell B23 two–seat trainer! You are about to start the assembly of a model manufactured from virtually unbreakable EPO (expanded polyolefin) foam, powered by a mighty brushless motor and lightweight LiPo battery. Everybody who has already mastered flying a "full house" trainer – with aileron, elevator, rudder, and throttle control - will enjoy this beautiful semi–scale model.

Bristell B23


Specification (Bristell B23)
Wingspan	9.274 m
Length	6.585 m
Empty weight	450 kg
Max. take–off weight	750 kg
Range	1100 km (125 KTAS)
Engine	ROTAX® 912S 100 HP
Visit https://www.pilatus-aircraft.com for more information.

In 2009 a renowned Czech aircraft designer Milan Bříštěla together with his son Martin founded the BRM AERO Ltd. Their first airplane Bristell Classic, an elegant ultra–light low–wing twin–seater with a tricycle undercarriage, turned out to be a stunning success (over 600 sold worldwide). The company has continued to grow and expand their line of products since then.

The latest addition is the Bristell B23, a two–seat all–metal low–wing airplane with a composite main undercarriage certified according to the EASA CS–23/U.S. 14 CFR (FAR) Part 23. The "full–size" B23 featuring a modern full–glass cockpit and latest avionics is a perfect trainer for flying schools as well as comfortable airplane for fun flying and distance travels.

Before you start

If you are not an experienced RC pilot, plan to have a fully competent pilot check your completed model and help you with your first flights. Even though we have tried to provide you with a thorough instruction manual, RC models are rather complicated and an experienced modeler can quickly check over your model to make sure your first flights are successful.
Please assemble your model exactly according to these instructions. Do not attempt to modify or change your model in any way, as doing so may adversely change its flying characteristics.
Before you begin, please check the entire contents of this kit to make sure that no parts are missing or damaged. This will also help you to become familiar with each component of your plane. If you find that any of the parts are either missing or damaged, please contact your dealer immediately for replacement.
Trial fit each part before gluing it in place. Make sure you are using the correct part and that it fits well before assembling. No amount of glue can make up for a poor fitting part.
The manual contains a drawing showing the default position of the Centre of Gravity (CG) and recommended control surface throws. Please note it is essential to keep the recommended CG position for the first flight otherwise the model could be unstable, hard to control or even unable to fly at all! Later, you can fine tune the CG position to suit your flying style and skills.

Note: Your dealer cannot accept kits for return if construction has begun.

Precautions

This RC model is not a toy. Use it with care and strictly following the instructions in this manual.

Assemble this model following strictly these instructions. DO NOT modify or alter the model. Failure to do so, the warranty will lapse automatically. Follow the instructions in order to obtain a safe and solid model at the end of the assembly.

Children under the age of 14 must operate the model under the supervision of an adult. Assure that the model is in perfect conditions before every flight, taking care that all the equipment works correctly and that the model is undamaged in its structure.

Fly only in days with light breeze and in a safe place away from any obstacles.

Safety precautions and warnings

An RC airplane is not a toy! If misused, it can cause serious bodily harm and damage to property. Fly only on a safe place, follow all instructions and recommendations in this manual. Beware of the propeller! Keep loose items that can get entangled in the propeller away from the spinning propeller, including loose clothing, or other objects such as pencils and screwdrivers. Ensure that yours and other people’s hands and face are kept away from the rotating propeller.
As the user of this product, you are solely responsible for operating it in a manner that does not endanger yourself and others or result in damage to the product or the property of others. This model is controlled by a radio signal that is subject to interference from many sources outside your control. This interference can cause momentary loss of control, so it is advisable to always keep a safe distance in all directions around your model, as this margin will help to avoid collisions or injury.
Never operate your model with low transmitter batteries.
Always operate your model in an open area away from power lines, cars, traffic, or people. Avoid operating your model in populated areas where injury or damage can occur.
Carefully follow the directions and warnings for this and any optional support equipment (chargers, rechargeable batteries, etc.) which you use.
Keep all chemicals, small parts and anything electrical out of the reach of children.
Moisture causes damage to electronics. Avoid water exposure to all equipment not specifically designed and protected for this purpose.
The model is mostly made of plastics – it is not fireproof. It may not be exposed to higher temperatures, otherwise severe distortion of the foam airframe or other damage may occur.

Specification


Wingspan	1600 mm
Length	1151 mm
Wing area	36,8 dm²
All-up weight	2100 g
Motor	C3548–800
ESC	KAVAN R–50SB SBEC
Propeller	10×6” 3–blade

Set contents

Almost ready to fly model o with the brushless motor, speed controller and servos installed, instruction manual. (Fig. 1a+1b)

You will also need

At least 6–channel RC set, 14.8 V 2600–3300 mAh LiPo flight pack.
Regular modeller’s tools: modeller’s knife, screwdrivers, pliers, No. 10 spanner, sand paper etc.
Glue: medium or thick cyano, silicone or MS polymer glue.

Model assembly

Trial the fit of the horizontal and vertical tailplane and the fuselage - no glue yet (Fig. 2+3). Double-check the parts fit tight and the fin is vertical to the horizontal stabilizer (Fig. 4). If necessary, sand the parts to fit.
Connect the rudder servo to the extension cable in the fuselage (RUDD) and secure the connectors with a piece of heat shrink tube, bind them together with a dental floss or secure with a strip of sticky tape. Apply medium or rather thick cyano (or clear silicone or MS polymer glue) to the contact area of the fin and attach the fin to the fuselage. (Fig. 2)
Connect the elevator servo to the extension cable in the fuselage (ELEV) and secure the connectors with a piece of heat shrink tube, bind them together with a dental floss or secure with a strip of sticky tape. Apply medium or rather thick cyano (or clear silicone or MS polymer glue) to the contact area of the horizontal tailplane assembly and attach it to the fuselage. (Fig. 3)
Before the glue sets, double-check the fin was vertical to the horizontal stabilizer. (Fig. 4)
Slide the wing halves onto the wing tube joiner; arrange the aileron and flap servo cables and the LED light cables onto the upper side of the wing. (Fig. 5)
Thread the servo and LED light cables into the cockpit and attach the wing to the fuselage. Attach the main undercarriage to the bottom of the wing and secure it together with the wing to the fuselage using two 3.0x40 mm bolts. (Fig. 6)
Insert the nose gear into the bracket in the fuselage, remove the canopy. Slide the nose gear arm onto the nose gear wire and secure it with M3.0×10 mm setting screw. (Fig. 7+8+9)
Attach the propeller to the prop driver and secure it with the propeller nut with a washer. (For your safety, leave the propeller installation after your radio is all connected and set and the correct direction of rotation of your motor has been tested.) Secure the spinner using M2.5×22 mm bolt in place. (Fig. 10)
Attach a strip of a hook–and–loop (the loop part, not supplied in the kit) to the bottom of your flight pack and secure it with the hook–and–loop fasteners to the battery seat in the cockpit. (Fig. 11)
Remove the connection board cover and hook up your receiver, servos and ESC following the wiring diagram right. The receiver is to be secured with a strip of double side foam tape or hook–and–loop tape to the rear part of the cockpit. Deploy the antennas, so their active parts were square to each other (if you are using a receiver featuring diversity antennas).
The LED lights are only powered via the connection board; they are not remotely controlled in any way.
With your radio on, set the servos to the neutral position (sticks and trims centered) and fasten the setting screws of the pushrod connectors on the elevator and rudder servo arms. Perform the throttle range calibration of the ESC as described in the attachment of this manual.
Attach the canopy.
Use medium cyano to glue the dummy antennas (Fig. 13) and Pitot tube (Fig. 14) in place.

Note: : The kit is supplied with the connection board for ailerons, flaps, rudder and the steerable nose gear so you can use even the most basic 6-channel radios to control your Bristell B23. If you intend to use independent control of aileron and flap servos and an advanced computer radio, you will have to replace the default Y–cables with four 25–30 cm extension cables.

RC set installation and preflight check

Referring to the instruction manual of your radio, carefully hook up the onboard electronics.
Once everything has been correctly connected, turn on your transmitter and plug in the flight pack. Check the neutral positions and throws of all control surfaces. If you needed to make the control surface throws smaller, simply move the pushrod closer to the centre on the servo arm or move it far from the control surface on the control horn. And vice versa.


Recommended throws	Low rate		High rate
Recommended throws	Rate	Expo	Rate	Expo
Ailerons	± 13 mm	30–40 %	± 20 mm	40 %
Elevator	± 13 mm	30–35 %	± 20 mm	35 %
Rudder	± 26 mm	25–30 %	± 40 mm	30 %
Flaps	Take–off: -12 mm down / Landing: -30 mm down

The "Low Rate" recommended control surface throws are suitable for a less skilled pilot and regular "scalish" flying; the "High Rate" setting allows an experienced pilot exploring the full capabilities of his model.
Check the direction of rotation of the propeller. If it was incorrect, simply swap two of the tree wires between the ESC and motor or program the ESC (refer to the ESC manual).
Check the correct position of the centre of gravity (CG): 75–85 mm behind the leading edge of the wing (Fig. 15). Adjust the CG position by moving the flight pack - if you could not reach the recommended position, do not hesitate to add appropriate amount of lead to the nose or tail. An extra couple of grams won’t spoil the flying characteristics - but the incorrect CG position is a killer.
Fully charge your flight pack and transmitter batteries, check the proper function of your radio and perform the range check of your radio according to its instruction manual. The range has to be almost the same with the motor off and at full throttle (no more than 10% decrease is acceptable). DO NOT try to fly unless the range check is 100% successful.