Krill ULTIMATE 300KS Mk2 39%

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ULTIMATE 300KS Mk2 39%

Assembly Guide

Dear customer,

thank you for choosing ULTIMATE 300KS Mk2 39% model airplane.

Original kit Ultimate 300 KS was developed by our team for patern and 3D flying too. Kit has had

great flying characteristics, but not sufficient for top competitive flying. We decided to improve it‘s

flying characteristic and in cooperation with great Italian pilot Sacha Checconi was created new

version Mk2 built on strong base of current kit and test it with our pilot Marek Plichta.

And what are the differencies?

At first, we put close together top to bottom wing and engine axis is now right in the middle of the

wings. At second we enlarged ailerons on all wings at depth and lenght too, overall area is now

bigger to original more than 60% ! Kit gets uncredible flying agility also during harier tricks. We

also decreased overall weight at the same time reinforced wings (new wing spar) for higher drain

during aggresive 3D flying . New is fixing of cabane inside the fuselage, new interplane struts , new

holder of tanks and already instaled rudder servo tray. Holder of main landing gear is also

redesigned, Gabriel horns are used on all control surfaces, as well as new builder friendly servo

fixing on the wings.

The ULTIMATE 300KS Mk2 kit is a full composite biplane kit, with main top wing from one piece

and bottom wings a horizontal stabilizator spar made from carbon fibre tubes. Both wings and

horizontal stabilizator can be easily removed for transporting. Tail control surfaces has central

hinges.

Content page

1. Technical data............................................................................................................................2

2. General informations.................................................................................................................2

3. Setting and setup.......................................................................................................................3

4. Recommended servos ...............................................................................................................4

5. Assembly...................................................................................................................................4

5.1 Empenage....................................................................................................................4

5.1.1 Rudder..........................................................................................................4

5.1.2 Horizontal stabilizator..................................................................................5

5.1.3 Elevator ........................................................................................................6

5.2 Wing assembly ............................................................................................................7

5.2.1 Servo install..................................................................................................7

5.2.2 Linkage.........................................................................................................8

5.3 Fuselage...................................................................................................................... 9

5.3.1 Rudder drive linkage .................................................................................. 9

5.3.2 Engine installation .....................................................................................10

5.3.3 Fuel & Smoke Tank installation................................................................11

5.3.4 Equipment installation................................................................................12

5.4 Landing gear..............................................................................................................12

5.4.1 Main landing gear.......................................................................................12

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Overview

Function Description
Important Technical Specifications
Key Improvements in Mk2 Version
Usage Features
Assembly Overview
Recommended Servos
Secraft Accessories (Recommended)
General Assembly Guidelines
Setting and Setup
Empennage Assembly
Wing Assembly
Fuselage Assembly
Landing Gear
Cowling
Maintenance Features
Disclaimer

The KRILL AIRCRAFT ULTIMATE 300KS Mk2 39% is a full composite biplane kit designed for pattern and 3D flying. This Mk2 version is an improved iteration of the original Ultimate 300 KS, developed in cooperation with Italian pilot Sacha Checconi and tested by Marek Plichta.

Function Description:

The ULTIMATE 300KS Mk2 is a high-performance remote-controlled biplane designed for advanced aerobatic maneuvers, including 3D flying and pattern flying. Its composite construction ensures durability and lightweight performance. The design improvements focus on enhancing flight characteristics, agility, and ease of assembly.

Important Technical Specifications:

Wingspan: 2330 mm
Length: 2550 mm
Weight (RTF): 15 kg
Wing area: 160 dm²
Wing loading: 93.75 g/dm²
Engine (Gas): 100-130 ccm
Minimum RC channels: 6

Key Improvements in Mk2 Version:

Engine Axis Alignment: The engine axis is now centered between the top and bottom wings.
Enlarged Ailerons: Ailerons on all wings have been enlarged in both depth and length, increasing the overall area by over 60% compared to the original, which significantly enhances flying agility, especially during "harier tricks."
Reduced Weight & Reinforced Wings: Overall weight has been decreased while the wings have been reinforced with a new wing spar to withstand higher stress during aggressive 3D flying.
Internal Cabane Fixing: New internal fixing of the cabane within the fuselage.
New Interplane Struts: Improved interplane struts.
Tank Holder: A new holder for fuel tanks.
Rudder Servo Tray: Pre-installed rudder servo tray.
Main Landing Gear Holder: Redesigned main landing gear holder.
Gabriel Horns: Gabriel horns are used on all control surfaces for precise control.
Builder-Friendly Servo Fixing: New, easier-to-install servo fixing on the wings.

Usage Features:

Assembly Overview:

The kit is a full composite biplane. The main top wing is a single piece, and the bottom wings and horizontal stabilizer spar are made from carbon fiber tubes. Both wings and the horizontal stabilizer are easily removable for transport. Tail control surfaces feature central hinges.

Recommended Servos:

Type: Strong and fast servos of standard size.
Recommended Torque: Minimum 25 kg/cm.
Recommended Speed: 0.08 – 0.11 s/60 degrees.

Secraft Accessories (Recommended):

Servo Arms:
- Servo arm D40 mm (for aileron and elevator): 6 units
- Double servo arm Offset D90mm (for rudder): 1 unit
- Double servo arm D64mm (for rudder): 1 unit
Ball Links: SEC Ball links M3 (10): 1 unit
Push Rods:
- SEC M3 Push rod of ALU 60 mm (for elevator): 1 unit
- SEC M3 Push rod of ALU 70 mm (for aileron and rudder): 3 units
Rudder Pull-Pull Set: SECRAFT rudder pull-pull set BASE No.: 2050130-01 or SPORT set No.: 2010130-02.

General Assembly Guidelines:

Fasteners: All nuts should be secured against loosening (Loctite 243 is recommended).
Control Surfaces: Ensure all control surfaces can move freely without obstruction.
Hole Reinforcement: All holes drilled in airplane surfaces that are not factory-made must be reinforced (e.g., with rowing, plywood).
Heat Protection: Protect the airplane against high temperatures (up to 90°C/194°F in sunny conditions) to prevent material degradation. Use protecting coats (available with the kit or separately via sales@krill-model.com).
Carbon Fiber: Be aware of the significant amount of carbon fiber in the model, which may affect receiver signal; ensure full signal strength.

Setting and Setup:

Incidence and CG:
- Engine axis: 2.5°
- Wing incidence: 0°
- CG location: 180mm from the leading edge.
Basic Setup:
- Ailerons: 20 degrees deflection, 40-50% expo.
- Elevator: 30 degrees deflection, 50-60% expo.
- Rudder: 30 degrees deflection, 50-60% expo.
3D Setup (Idle 1):
- Ailerons: 30 degrees deflection, 60-70% expo.
- Elevator: 40 degrees deflection, 60-70% expo.
- Rudder: 40 degrees deflection, 60-70% expo.
3D Setup (Idle 2):
- Ailerons: 45 degrees – full deflection, 70-80% expo.
- Elevator: 60 degrees – full deflection, 70-80% expo.
- Rudder: 50 degrees – full deflection, 70-80% expo.

Empennage Assembly:

Rudder: Shorten Gabriel horns 6/27 pegs to 13mm, then glue them into prepared holes with epoxy resin.
Horizontal Stabilizer:
1. Install the servo and drill a hole for the servo lever, ensuring sufficient space for full movement to prevent damage to the stabilizer surface.
2. Secure the horizontal stabilizer against motion by drilling a hole through the surface and carbon fiber tube (stabilizer spar), then inserting a pin or screw. This must be done on both halves.
Elevator: Glue Gabriel horns 6/20 into predrilled holes on both elevators. For linkage, use a Secraft turnbuckle ALU pushrod 60mm long, with a Secraft ball link M3 on one side and an original Gabriel ball link on the other. The overall link length is 80mm. Use 40mm ALU Secraft V2 servo arms.

Wing Assembly:

Servo Installation:
1. Route individual aileron servo cables to the receiver/central unit. The cable for the left upper aileron servo is guided through the shaft into a hole in the lower part of the cover in the inter-wing strut space (a string is provided for easier routing).
2. The cable continues through the inter-wing strut to the left lower wing, then from the root of the lower wing to the fuselage. The same applies to the right side.
3. Use connectors to interrupt cables between the wing and inter-wing strut to maintain demountability.
4. PowerBox ONE4ONE cable sets are advisable. Two cables (upper left and lower left aileron servos) protrude from the root of the lower wing; a PowerBox ONE4TWO cable set is suitable between the fuselage and the wing.
5. The cable outlet from the root rib of the lower wing, terminated with a connector (ONE4TWO), should be fastened with a mounting frame.
6. Servos are installed in new servo holders with integrated servo shaft covers. Mount the servo in the holder, fit with a 40mm long Secraft arm, and center the lever. After routing cables, insert the cover with the servo into the shaft and fasten with four screws.
Linkage: Glue Gabriel horns 6/20 into prepared holes. Shorten horn pins to 12mm and 8mm as per the picture. Connect the servo arm to the Gabriel horn using a 70mm long pushrod, terminated with an original Gabriel ball link on one side and a Secraft ball link on the other.

Fuselage Assembly:

Internal Equipment: The installation of internal equipment is highly individual. The model comes with an exhaust holder, tank holder, and battery holders.
Rudder Drive Linkage: Use two standard servos mounted in the pre-glued deck. The rear servo uses a Secraft double-sided offset arm 90mm, and the front servo uses a Secraft double-sided straight arm 64mm. The arms are interconnected by linkages made of Secraft ball links and 70mm pushrods. The drive itself is a pull-pull system using a Secraft Rudder pull-pull set BASE or SPORT.
Engine Installation:
- The MVVS116NP engine was used in the prototype, but any 100-120cc 2-cylinder boxer engine can be used.
- Mount the engine offset 2.5 degrees to the right, horizontally at zero.
- Use spacers to position the prop hub plane 2-3mm in front of the engine cover plane, respecting the engine misalignment so the engine axis at the prop hub level intersects the vertical axis of the fuselage.
- Silencers of various types can be used; a 60mm diameter muffler exhaust holder is supplied.
- Place the carburetor control servo under the engine using a Secraft side servo mount.
- Place the engine ignition on the side sloping wall of the firewall.
Fuel & Smoke Tank Installation: Use the standard delivered holder designed for Secraft square tanks (SE Fuel tank 1000ml). Attach tanks to the holder with Velcro.
Equipment Installation: No deck is installed for electronics. Due to the small size and weight of receivers, satellites, and powerboxes, they can be attached directly to inner walls using double-sided adhesive tapes and Velcro. For batteries (typically 2x RX batteries and 1x ignition battery), use the supplied battery holders.

Landing Gear:

Main Landing Gear:
- The landing gear legs are pre-drilled. Install wheel axles and fit wheel covers.
- Ensure chosen wheels pass through wheel cover holes; enlarge if necessary.
- Drill holes for axles in both undercarriage legs.
- Make a notch in the wheel cover to slide it onto the axle.
- Install the wheel with the axle on the chassis leg, then slide on the wheel cover before final tightening.
- Fix the wheel cover to the fuselage with transparent adhesive tape.
Tail Wheel Assembly:
- Recommended: Tail wheel 2010300-81 Tail wheel 35% with leg of C/F V2.
- Attach the tail wheel to the reinforced area of the fuselage tail using two M4x20 screws and secure with M4 nuts inside the fuselage.
- Drill 4mm diameter holes into the CF leg of the tail wheel.
- Place the tailwheel leg on the fuselage surface and drill the fuselage with the tail wheel leg.
- Note: Later models of ULTIMATE 300KS Mk2 have pre-drilled holes and installed nuts for easier tail wheel assembly.
- The tail wheel does not need to be controlled by the rudder linkage; it can be left free.

Cowling:

The engine cover (cowling) is delivered as removed from the mold. It is folded with the fuselage and has holes for connecting screws.
Additional holes for engine cooling and carburetor air access should be made in the bottom of the engine cover. The engine cover was modified for the MVVS116NP engine.

Maintenance Features:

Fastener Security: Regularly check and secure all nuts with Loctite 243 to prevent loosening from vibration.
Control Surface Movement: Periodically verify that all control surfaces move freely and without obstruction.
Heat Protection: Store the aircraft away from direct sunlight and high temperatures to prevent material degradation. Apply protective coats as needed.
Cable Connections: Inspect cable connections, especially those interrupted by connectors, to ensure secure contact.
Landing Gear: Check landing gear components for wear or damage, ensuring axles and covers are securely fastened.
Engine and Fuel System: Regularly inspect engine mounts, fuel lines, and tank holders for any signs of wear or leaks.
General Inspection: Conduct a thorough pre-flight inspection before each use to identify any loose parts, cracks, or other damage.

Disclaimer:

KRILL model takes no responsibility for damages incurred during the assembly, flying, using, or transporting this model airplane. This assembly guide provides recommendations; experienced users may adapt procedures based on their habits and skills.