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Rearrangement / Relocation of PCB Junction Plates and Associated Cables / Plugs 

 
To facilitate access the PCB junction plate attached on the outboard sides of the central 
wing saddle have been relocated to be inside and beneath the wing saddle cover plate. 
 

 

New location of PCB plates in wing saddle and not on removable wing section 

 
By removal of the six screws (screwed into the obeche inserts) the cover plate is removed 
and all servicing and checking can be made without recourse to wing / wing saddle removal.  
 
The wings can remain assembled (or easily removed as a unit if required for transport or 
other personal reason) but in any case it becomes unnecessary to have to remove and refit  
the PCB connections – if they were to remain in their original locations - each time the wings 
are removed from the aircraft.  
 
All that is necessary is to detach the usual type plugs between the wing saddle and the 
receiver located in the cockpit. 
 
If the wing / saddle unit MUST be removed from the fuselage then the PCB – inserted in a 
slot in the wing saddle – can be easily removed – the plugs disconnected and the wings 
detached from the saddle.  
 
At a wingspan of 1300 this should only be required if damage has occurred. 

Relocated PCB plate 

including lighting and 

cabling in wing saddle 

Obeche plate 

epoxied in position 

– 6 off 

Summary of Contents for AT-6 Texan

Page 1: ... of the model as provided by HobbyKing are as follows Specs Wingspan 1300mm Length 956mm Height 380mm Flying Weight 1350g Motor 760KV brushless outrunner ESC 30A brushless Servo 9g x 4 17g x 2 Battery 2400mAh 2700mAh required Propeller 11x8 Includes User manual Engine Sound Module System All necessary hardware Requires 6CH transmitter and receiver 3S 11 1V 2400 2700mAh lipoly battery ...

Page 2: ...oted above the manual provided seems not to be for this specific variant of the Texan which was also disappointing The content of the manual specifically related to the sound system is not related to this model Both of these aspects have been referred to HobbyKing with advices from them that corrections will be made although as of compiling this note nothing has been noted on the website in the fi...

Page 3: ...d flight a tip stall was experienced with the aircraft being damaged on impact The motor shaft was bent various cracks in the foam were to be noted the wing saddle was significantly moved with resultant damage distortion Refer to the end of this build record for details method of repairs Pleasingly the wing spar modification proved to be impact resistant as initially based on the experiences of ot...

Page 4: ...ing spar arrangement has been the subject of much criticism and a number of various proposals to modify the original arrangement Whilst the method I have applied may not be best available it must be borne in mind that one does not set out on receipt of a model from a supplier to essentially redesign the entire aircraft In many instances any modification will be a compromise Given the anecdotal inf...

Page 5: ...he foam looking down into the small slit area and the central cable passage for the landing gear cables this can be seen and it is between this tubular auxiliary spar and the wooden spars that the modification was effected Maintaining the wooden spars firmly onto the aft side of the spar slot the foam between the wooden spars and the tubular auxiliary spar was carefully removed down to the depth o...

Page 6: ...0mm in one continuous length This is inserted into the new gap on the forward side of the wooden spars The length of the carbon fibre section was arranged so that it terminates outside the central saddle such that when the wing sections are slipped onto the wooden spars about 30mm of the carbon fibre section is actually within the wing section itself To facilitate easy inserting of the wing sectio...

Page 7: ...the temporary fit up of the carbon fibre section in the channel area before epoxy gluing The carbon fibre can be seen extending to the left of the central wing saddle Spar channel increased in fore and aft width to a depth equivalent to the wooden spar Carbon fibre spar shown in position prior to epoxying in place ...

Page 8: ...e thicker reinforced now composite spar Carbon fibre utilised was 400 mm long and 10mm x 2 mm thick Wing Saddle Cover Plate The underside of the wing saddle is provided with an EPO cover plate contact glued in place This should was carefully prised up and gradually removed in one piece This is a major part of the improvement of access with this model in my view as it enables access to all cables c...

Page 9: ...original wooden spar is widened to accommodate the wooden spar plus the carbon fibre insert The diameter of the speaker is marked onto the cover plate for reference purposes as consideration is being given to opening up the free are area for transmission of sound Carbon fibre spar epoxied in place note four obeche inserts for screwing cover in place two additional inserts were fitted at mid width ...

Page 10: ...removed as a unit if required for transport or other personal reason but in any case it becomes unnecessary to have to remove and refit the PCB connections if they were to remain in their original locations each time the wings are removed from the aircraft All that is necessary is to detach the usual type plugs between the wing saddle and the receiver located in the cockpit If the wing saddle unit...

Page 11: ...ediately below Opening in fuselage to allow easier access of cabling and better ventilation air flow At the same time cooling air entry locations were examined and some alterations effected Dummy Exhaust Pipe The dummy exhaust pipe was carefully removed from the model it is held in place with contact adhesive the cowling and the motor had been previously removed and the pipe was cleared of foam ve...

Page 12: ...e Opening in fuselage continued internally as to allow air flow from internal annular space immediately behind propeller There is now the possibility of air flow exhaust from the pipe General Ventilation Two openings were enlarged provided in the floor of the cockpit area as to provide air movement and cable access between the two areas View from underside indicating openings introduced and the un...

Page 13: ... strengthened with 10mm x 0 5 mm carbon fibre epoxied in place Air Scoops Lower and at Side Each of these were cleared of any foam within the openings and the fuselage internally opened up carefully as to allow air flow to internal spaces Lower inlet scoop opened up Side inlet scoop opened up ...

Page 14: ...Wings Each wing it seems is comprised of about eight separate sections seemingly all put together with contact adhesive Whilst this will give some flexibility perhaps too much there is a case to stiffen up some of the panels With this in mind white fibreglass reinforced tape was placed along a number of joins In an attempt to restore the yellow colour a second taping of translucent yellow wing tap...

Page 15: ...tube was placed on each of the two screws to soften the attachment point when tightening and also to provide a little movement which will occur Pilot The green hair of the pilot was painted black his jacket brown and his trousers navy blue The screw securing the pilot ouch was removed and the pilot becomes a loose fitment retained in his seat by an elastic band Part of the foam on the canopy under...

Page 16: ...ood plate was made 1 5 mm ply about 75mm x 35mm onto which the sound module is secured There was meant to be a wooden plate provided as per the manual but that was missing CA is used in the screw holes to assist in strength The plate with the sound module attached is then secured across one of the new openings made in the floor between upper and lower spaces of the fuselage ...

Page 17: ...t binding is more straight forward Electronic Speed Control The original ESC failed on powering up and was replaced with a Turnigy Plush 40 ampere unit which is slid into the original location The Plush ESC unit is a little larger and is as a result a bit tight in place but increased air flow in the area should minimise heating issues Servos One flap servo was DOA so both were replaced with HobbyK...

Page 18: ...gh reference is still made to volume control Not sure where the heat sink is either Information is located at hardware and accessories audio systems and parts in the files section for the PNP Engine Sound Module System FINAL WEIGHT Final weight of aircraft was 1620 grams with the Donkey style motor fitted Donkey style motor weight is 136 grams This weight includes the battery see above the pilot a...

Page 19: ...o cover the holes made in the cowl when it impacted The yellow is as good as identical particularly when a few layers are used Fuselage Generally all foam fractures have been repaired utilising foam safe cyanoacrylate The carbon fibre stiffeners added to the sides of the fuselage within the cockpit became detached in the incident These have been re epoxied in place it is always somewhat difficult ...

Page 20: ...st lines The motor is directly attached to the aluminium plate A larger collet to suit the 5mm Scorpion shaft was fitted and the original propeller retained Wing Structure No damage was occasioned to the wings themselves or the spar reinforcement arrangement Whilst the wing saddle did suffer some distortion this was almost totally removed by thumb massaging the foam after applying hot water wetted...

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