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Instructions for Extra 300L IMAC-Airplane

Thank you very much for purchasing our Composite-ARF Extra 300L 2.12m (84” span) all com-
posite aircraft, made with the revolutionary Total Area Vacuum Sandwich (TAVS) technology

Please note that some photos in these instructions show our 2 x 2 Extra, which has almost iden-
tical assembly in many areas (especially wings and stabs), but of course the colour scheme is
different - so don’t get confused by this !

If you want a full-color version of this manual, you can download it free of charge from our web-
site, as an Adobe Acrobat .pdf file and print it. Just go to the Extra 2.12 page on our website, and
click on the link named ‘Download Instruction Manual’ link above the top photo of the product.

NB:

Please

read all of the important information on pages 3 - 7 of this Instruction Manual 

carefully 

before

starting the assembly of your Extra 300, especially if this is one of your 

first fully-composite ARF type aircraft.

Before you get started building and setting-up your aircraft, please make sure you have read this
Instruction Manual several times, and understood it. If you have any questions, please don’t
hesitate to contact us. Below are the contact details:

Email:

[email protected]

or

[email protected]

Telephone:

Phone your C-ARF Rep!!! He will be there for you.

Website:

http://www.composite-arf.com

Liability Exclusion and Damages

You have acquired a kit, which can be assembled into a fully working R/C model when fitted out
with suitable accessories, as described in the instruction manual with the kit.

However, as manufacturers, we at Composite-ARF are not in a position to influence the way you
build and operate your model, and we have no control over the methods you use to install,
operate and maintain the radio control system components. For this reason we are obliged to
deny all liability for loss, damage or costs which are incurred due to the incompetent or incorrect
application and operation of our products, or which are connected with such operation in any
way. Unless otherwise prescribed by binding law, the obligation of the Composite-ARF compa-
ny to pay compensation is excluded, regardless of the legal argument employed.

This applies to personal injury, death, damage to buildings, loss of turnover and business,
interruption of business or other direct and indirect consequent damages. In all circumstances
our total liability is limited to the amount which you actually paid for this model.

BY OPERATING THIS MODEL YOU ASSUME FULL RESPONSIBILITY FOR YOUR ACTIONS.

It is important to understand that Composite-ARF Co., Ltd, is unable to monitor whether you
follow the instructions contained in this instruction manual regarding the construction, operation
and maintenance of the aircraft, nor whether you install and use the radio control system
correctly. For this reason we at Composite-ARF are unable to guarantee, or provide, a
contractual agreement with any individual or company that the model you have made will
function correctly and safely. You, as operator of the model, must rely upon your own expertise
and judgement in acquiring and operating this model.

Composite-ARF Extra 300L

(2.12m/84”)

[email protected]

2

Summary of Contents for Composite-ARF Extra 300L

Page 1: ...techsupport composite arf com Composite ARF Extra 300L 2 12m 84 Instruction Manual Composite ARF Extra 300L 2 12m 84 TAVS Technology version 1 0...

Page 2: ...essories as described in the instruction manual with the kit However as manufacturers we at Composite ARF are not in a position to influence the way you build and operate your model and we have no con...

Page 3: ...these important joints that don t seem to have enough glue on them then light ly sand the area with 120 grit sandpaper clean the area carefully with Acetone or denatured alcohol or similar on a paper...

Page 4: ...ngine off please con tact the radio supplier engine manufacturer and DON T FLY at that time Check for vibrations through the whole throttle range The engine should run smoothly with no unusual vibrati...

Page 5: ...negative moulds constructed using TAVS technology The main internal parts for the landing gear composite engine firewall and exhaust tunnel wing and stab spar supports are glued in during manufacture...

Page 6: ...mm 3mm and 4mm 3 Sharp scissors 4 Pliers various types 5 Wrenches metric 6 Slotted and Phillips screwdrivers various sizes 7 M3 tapping tool metric 8 Drills of various sizes 9 Dremel tool or Proxxon o...

Page 7: ...edback composite arf com Accessories This is a list of the things you may need to get your Composite ARF Extra 2 12m 84 into the air Some of them are mandatory some of them can be chosen by you What w...

Page 8: ...trol horns milled plywood firewall and servo mounts are also included in the kit The flying characteristics of the 2 12m Extra are quite similar to the original 2 x 2m Extra The 5 larger wing allows a...

Page 9: ...important to prepare the inside of the fuselage properly by roughing up and cleaning the surface before gluing any parts to it Before starting construction it is a good idea to check inside the fusela...

Page 10: ...the wheelpant M4 nut washer fibreglass wheelpant carbon landing gear leg and finally another washer and the M4 locking nut A drop of Loctite before tightening the locknut is good insurance To set the...

Page 11: ...anopy frame is secured to the fuselage by a phenolic hook installed in a small milled plywood plate and 2 or 4 small phe nolic tabs in the side rails to align the frame with the fuselage exactly Light...

Page 12: ...led plywood tongues to the squares in the fuselage and drill through the fuselage sides and the ply squares 3mm for the bolts Extend the length of the slots in the fuselage flanges only backwards by 6...

Page 13: ...of the canopy match perfectly with the fuselage shape we recom mend that add 2 or 4 if you fitted the hatch catch small phenolic tongues as shown and file matching slots in the fuselage lip We have in...

Page 14: ...easy as it is already cut and trimmed at the factory We sug gest that you fit this now and make any cutouts cooling and access slots after you fit the motor The cowl is secured to the fuselage with si...

Page 15: ...tabs The stabs are 95 finished and the hinging is already completed for you using 4 large Robert hinge points in each elevator so you only need to install servos horns and linkages The fibreglass tube...

Page 16: ...profile Put some masking tape on the fuselage and carefully mark and cut out the 2 holes to the size for your servos If using a standard sized servo like the JR Graupner 8511 8611 then the back of th...

Page 17: ...ottom surface of the stabs Remove the servos and secure the phenolic arms to the servo discs with 2 small bolts and nuts M2 or equivalent for each servo Make up the elevator linkages from the 60mm lon...

Page 18: ...th stabs Rudder The rudder is hinged to the fin with a 2mm wire which passes thru the 3 phenolic hinge posts that are factory installed and aligned File a point on one end of the wire and a short 90 b...

Page 19: ...photo here without CG problems Note Fit the wings to the fuselage before gluing in the rudder servo mounting plate so that you cannot accidentally deform the fuselage With servo mounted under the coc...

Page 20: ...levise holes are perpendi cular to the hinge axis As before we advise you to fit just one horn first then make a template see photo right to ensure that the other horn is positioned the same Servo cho...

Page 21: ...mum 125 this will still allow even the hi rate 3D throws mentioned at the end of the manual Please do not use the outer hole on the servo arm and do not reduce the throws electronically in your transm...

Page 22: ...ng a stack of washers between the back face of the motor stand offs and the front of the plywood firewall The firewall consists of 2 identical milled 3mm plywood sheets One of these must be glued to t...

Page 23: ...of each other and drill thru 6mm for the 4 holes for the standoffs With the fuselage upside down mark the centerline of the fuselage just in front of the firewall position Tack glue the front firewall...

Page 24: ...e middle of the radiused curve on the top of the fuselage The thrustline can easily be adjust ed after trimming flights by adding or removing washers You will need to make a cut out in the bottom of t...

Page 25: ...y doublers for a good fit of the TD75 pipe Trial fit the pipe support in the tunnel positioned about 75mm 3 from the back of the cutout in the fuselage and tack in place with a drop of CA Test fit the...

Page 26: ...stem or mini pipe can still be installed inside the composite exhaust tunnel but make sure that there is sufficient cooling as described and make a balsa baffle inside the cowling if needed to direct...

Page 27: ...asily made from the soft wire of a paperclip wrapped around a small screwdriver and secure with a fuel line clamp or cable tie Don t miss this small detail it could cost you your plane We use the norm...

Page 28: ...nd gas engine ignition unit as far away as possible from the Receiver and Antenna Batteries and Switches As this model only has 5 or 6 servos even if they are all digital types as we have used here a...

Page 29: ...those 10G manoeuvres everything in the plane has 10 times more force than usual Be very careful to fix all your batteries securely Make extra sure that no fuel tubes or cables can come in contact wit...

Page 30: ...CG setting and should not be used for the first flights With this rearward CG you will need to use the high rate control throws and more exponential as described below Don t forget to balance the plan...

Page 31: ...to 32mm and the bottom to 35mm Yes this is a reversed differential due to the hinge line being in the top skin instead of on the centre line You will have to finalise this differential figure during f...

Page 32: ...Silicone tube 10mm x 125mm muffler mounting 4 T nut M6 engine mounting 4 Allen bolt M6 x 20mm engine mounting 4 Washer M6 large engine mounting 8 Allen bolt M3 x 12mm cowling mounting 2 spare 2 Allen...

Page 33: ...ecure stab tube into stabs 2 M3 washers 8 Sheetmetal screws 2 9 x13mm to attach servos to plywood mounts 4 Sheetmetal screws 2 2 x 10mm 4 Bolt M2 x 10mm to secure phenolic arms to metal servo discs 4...

Page 34: ...techsupport composite arf com 34 Standard Wood parts included in the kit Standard Hardware included in the kit Fuselage hardware pack Wing hardware pack Stabilisers hardware pack Rudder hardware pack...

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