SIG MESSERSCHMITT Bf-109 Assembly Manual Download Page 10

spinner backplate in its running position, allowing the cowl to be
accurately mounted to the fuselage.

3) Position the front of the cowl to contact the spacers on the

back of the spinner backplate and then, center the cowl to the
backplate in both top and side views. Use tape to hold the cowl to
the backplate in this centered position. Use a few more pieces of
tape to hold the cowl to the fuselage at its back edges. The cowl
should now be firmly and accurately in position. Using a #60 (.040"
dia.) bit, drill four pilot holes through the plywood pads beneath the
four pre-drilled holes in the cowl.

4) With a screwdriver, install the four cowl mounting screws

through the holes in the cowl and into the plywood pads. Tighten
the screws just enough to place the washer head in contact with
the cowl - no more. Remove the pieces of tape, the propeller nut,
the propeller, and the plywood backplate.

Remove the 1/16" 

spacers from the rear of the backplate and lightly sand the 
backplate smooth.

MOUNTING THE TAIL  SURFACES:
In the following steps you will need the following parts:

Bag #1

Vertical fin and rudder assembly

Bag #2

Horizontal stabilizer and elevator assembly 

Bag #12

2 ea. M4 x 30 mm Nylon wing bolts

1) Remove the elevators, rudder, and hinges from the tail 

surfaces. Insert the vertical fin into its slot at the top rear of the
fuselage. It should bottom out on the built in platform at the bottom
of the slot.

The trailing edge of the fin should be in perfect 

alignment with the vertical tailpost of the fuselage - slide it forward
or back until it is aligned. Next, use a sharp, soft pencil to mark
both sides of the fin where it meets the fuselage at the slot.
Remove the fin from the fuselage and use a sharp #11 blade to

The servos are now tested using the radio system. Connect the
appropriate rudder and elevator servo leads into the receiver, turn
on the transmitter, and connect the flight battery to the ESC lead.
Make sure the rudder and elevator trims are at neutral. Test the
servos with the transmitter for proper movement and the alignment
of the servo arms at neutral. If necessary, reposition the output
arms to align them at 90

O

to the servo body at neutral. With arms

now positioned correctly, reinstall the servo output arm retaining
screws. Unplug the flight battery and turn off the transmitter.

MOUNTING THE  COWL:
In the following steps you will need the following parts:

Fuselage with motor mounted

Prop adaptor part for your specific motor

Flight propeller.

Bag #6

Sub bag containing four (4) T2 x 12 mm PWA 
cowl mounting screws

Bag #13 

1 ea. Plywood spinner back plate 

1) Mount prop adaptor on the motor output shaft and secure it

in place. The provided plywood spinner backplate has a center
hole diameter of 6 mm (just under 1/4"). This hole will likely have
to be opened up to fit onto your propeller adaptor. Do this now.
After establishing a good concentric fit, remove the plywood 
backplate from the adaptor. Tack glue four (4) 1/16" (1.5 mm) thick
spacers to the back surface of the backplate, as shown. These will 
properly locate the cowl in relationship to the spinner.

These 

spacers will be removed shortly.

2) Slide the cowl in place onto the front of the fuselage, 

moving it back until the front of the cowl is slightly behind the face
of the prop adaptor.

Slip the spinner backplate onto the prop 

adaptor shaft with the 1/16" spacers towards the cowl. Place the
propeller in position onto the prop adaptor shaft and tighten it 
in place with a propeller nut. This set-up should now have the 

9

Summary of Contents for MESSERSCHMITT Bf-109

Page 1: ......

Page 2: ...ee Power System section for recommendations Lithium Polymer Battery Pack see Power System section for recommendations Propeller see Power System section for recommendations Motor mounting bolts sized for your particular motor Dremel Tool with a variety of sanding bits An assortment of screwdrivers R 1 Messerschmitt Bf 109 ARF ASSEMBLY MANUAL INTRODUCTION The prototype Messerschmitt Model 109 first...

Page 3: ... effect on the printed finish However carefully note that certain solvents can and will soften the ink allowing it to be rubbed off The following is a short list of cleaners and solvents that can and cannot be used on the printed finish of your model Use Do Not Use Windex Window Cleaner CA Debonder SIG Model Magic Cleaner Acetone Hexane Alcohol Dope Thinner If in doubt of the suitability of a clea...

Page 4: ...rs Bag 15 4 ea 8 mm square x 12 mm hardwood for wing servo mounts Bag 16 Tail Brace Bag all parts painted gray 2 ea 2 mm dia x 94 mm wire threaded M2 on one end and an eyelet bent on the opposite end 2 ea M2 R C metal R C links 2 ea M2 knurled lock nuts Sub bag 2 ea Metal tabs drilled two places and bent in center 2 ea T2 x 6 mm PWA screws 2 ea T2 x 8 mm PWA screws 2 ea 3 mm ID x 6 mm silicone tub...

Page 5: ... for CA glue to fully wick its way across the surface of the hinge and surrounding wood Allow about 10 minutes or so before flexing the ailerons After sufficient time has passed firmly flex each aileron briskly up and down to create free and easy movement We also suggest pulling on the aileron at each hinge location making sure each hinge is firmly in place 4 Remove the four screws from each corne...

Page 6: ...k this stick loose and unwind the string from the stick This end of the string is secured firmly to the connector end of the servo extension lead we like to tie this string tightly to the connector With the string in place to the connector feed the connector and string into the servo bay while gently pulling on the string at the exit hole in the center of the wing Start the connector down through ...

Page 7: ...e the edges of these slots are Once the slots are located use a sharp 11 blade to carefully slit the covering from one end of the slot to the other Repeat this with the opposite landing gear slot to its bottom surface Repeat this process on the opposite aileron Use the four M2 x 20 mm bolts and the two plastic control horn backing plate to now mount each aileron horn to the bottom of each aileron ...

Page 8: ...olts and washers for your specific motor We always suggest using a non permanent thread locking compound for these bolts such as Loctite Blue This simple precaution works very well to keep these bolts in place under vibration 7 2 Attach the gear doors to the inside of the gear legs using the metal clips M2 x 8 mm bolts M2 nuts and M2 washers Note that the bottom edges of these doors are made with ...

Page 9: ...unting marks just made Reinstall the servos and secure them to the tray using the mounting screws that came with them Note that the output ends of these two servos are towards the front of the fuselage 4 With the servos now mounted check the relationship between the two servo output arms when they are in place on the servos If there is any interference then you will have to select or modify servo ...

Page 10: ...he slot Remove the fin from the fuselage and use a sharp 11 blade to The servos are now tested using the radio system Connect the appropriate rudder and elevator servo leads into the receiver turn on the transmitter and connect the flight battery to the ESC lead Make sure the rudder and elevator trims are at neutral Test the servos with the transmitter for proper movement and the alignment of the ...

Page 11: ...coat both sides of the fin slot in the fuselage again with white glue Carefully slide the fin into the fuselage slot and wipe off any excess glue with a wet paper towel As before check and then double check the alignment The trailing edge of the fin is in alignment with the fuselage tail post the horizontal stabilizer is perfectly level with the wings and the vertical fin is sitting at 90O If need...

Page 12: ... with epoxy glue Use a piece of business card to now work some epoxy glue into the fuselage hinge slot cleaning up any excess Now insert the brass hinge half partially into its slot in the fuselage and engage the two CA hinges into their slots in the rudder Press the rudder in place to the fuselage and fin The two rudder CA hinges can now be glued in place using the same method described earlier d...

Page 13: ...the pushrod connector stub into the last outer hole in the elevator control horn and secure it to the horn with the metal cup washer Repeat this procedure for the rudder pushrod installing the pushrod connector stub into the second inboard hole in the rudder control horn as shown Turn on your transmitter and power up the receiver with your flight battery pack Once again check the rudder and elevat...

Page 14: ...er the cockpit From the kit parts locate the canopy and the four T2 x 6 mm PWA mounting screws In top view the canopy is centered over the cockpit with approximately 1 8 of its rear edge extending back past the rear surface of the slanted cockpit fuselage former Use small pieces of tape to hold the canopy in this position Use the four T 2 x 6 mm PWA screws threaded through the provided holes in th...

Page 15: ...arks on the edge of the cone Tape the template in position and trace the outline of the blade cutout onto the cone Move the template over to the opposite mark tape it in place and use pencil to trace the remaining blade cutout outline The prop blade cutouts are now made in the spinner To make this relatively easy and accurate we used a Dremel Tool with a highly tapered sanding bit followed by sand...

Page 16: ...de down Locate the balancing fixture at the two 2 1 2 marks on each side of the wing next to the fuselage sides If the model is properly balanced it will be suspended perfectly level If the nose hangs down the airplane is nose heavy and conversely if the tail hangs down the model is tail heavy A slightly nose heavy model is certainly the lesser of two evils However a tail heavy condition must be r...

Page 17: ...ft and right turning ability If you don t make any adjustments needed to achieve positive ground control Once you are satisfied with the taxi tests line the model up with the center of the runway with the nose pointed directly into the wind Hold a little up elevator and smoothly advance the throttle do not throw the throttle fully open all at once The model should roll forward smoothly tailwheel o...

Page 18: ... favor and check everything now The second flight should be even more fun because you now have a trimmed model MAINTAINING YOUR Bf 109 Getting into the habit of routinely performing maintenance and inspection of your Bf 109 will keep it looking good and flying good for a long time Full scale airplanes receive this kind of routine treatment and fly safely for years Your R C model aircraft should re...

Page 19: ... size or full size are not toys Because of the speeds that airplanes must achieve in order to fly they are capable of causing serious bodily harm and property damage if they crash IT IS YOUR RESPONSIBILITY AND YOURS ALONE to assemble this model airplane correctly according to the plans and instructions to ground test the finished model before each flight to make sure it is completely airworthy and...

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