background image

❑ 

3) Mount the wing to the fuselage, and then trial fit the 

stabilizer/elevator assembly in place. Check the alignment of the
stab with the rest of the airplane. View the airplane from the top,
front and rear, making sure the stabilizer is not tilted or skewed
(see drawing on next page). Measure the distance from the wing
trailing edge back to the stab's leading edge tip, and note the 
distance. Then make the same measurement on the opposite side
of the airplane. The two measurements must be the same. Adjust
the stabilizer as needed until they are the same.

❑ 

4) The stabilizer/elevator assembly can now be permanently

glued into the fuselage. Slow-drying epoxy glue is recommended
for this step, to allow you plenty of time to get the stab back in 
proper alignment before the glue dries. Wipe any epoxy glue
smears off the covering material with a rag soaked in rubbing 
alcohol.

❑ 

5) Seperate the Fin and Rudder from each other, and set the

Rudder and Hinges aside for now. Trial fit the fin alone in place on
the fuselage. There should be no gaps between the bottom of the
fin and the top of the fuselage. If there are any gaps, sand the 
bottom of the fin to eliminate them.

❑ 

6) Use a felt-tip pen to mark the locaton of the fin on the top of

the fuselage. Then take the fin back off the airplane and remove
the covering material from the top of the fuselage between the
marked lines, (see photo on next page). This must be done to 
provide a strong wood-to-wood joint between the bottom of the fin
and the fuselage.

❑ 

7) Next figure out how you are going to fuel and de-fuel your 

airplane, and whether that will require another opening in your
cowling. If so, make the appropriate opening at this time.

Note: For the YS-63, we did not need an additional opening - the
fueling is done through the opening we made for the cylinder head
in the bottom of the cowling.

❑ 

8) The supplied plastic Spinner is easy to assemble. If the 

diameter of your engine's prop shaft is smaller than the hole in the
spinner backplate, select a prop shaft adapter to fit. If your prop
shaft is larger than the hole in the backplate, the hole can be drilled
larger to fit (use drill press).

Install the backplate and your 

propeller tightly onto your engine, using the engine's prop nut and
washer.

Snap the spinner cone in place, and attach it to the 

backplate with the four screws provided. Don't over-tighten the
screws.

FUSELAGE ASSEMBLY, PART IV: Tail Surfaces & Tailwheel
For the following steps you will need these parts:
• The fuselage assembly
• 1 - Stabilizer & Elevator Set
• 1 - Fin & Rudder Set
• 9 - CA Hinges (6 for elevators, 3 for rudder)
• 1 - Tailwheel Wire, Mounting Bracket, Wheel Collar, Set Screw
• 4 - M2 x 10mm Phillips-Head Screws
• 1 - 1" dia. Tail Wheel
• 1 - Wheel Collar w/ Set Screw

❑ 

1) Six CA hinges have been factory installed, but not glued, in

the Stabilizer and Elevator set. Glue the hinges permanently in
place at this time, using the same proceedures used for gluing the
aileron hinges on page 5. Let dry 10 minutes before flexing the
hinges. Do not glue the Fin and Rudder hinges at this time!

❑ 

2) Prepare the fuselage to receive the stabilizer and elevators by

extending the stabilizer cutout all the way to the back of the 
fuselage. In other words, cut out the portion of the fuselage that is
directly behind the stabilizer slot, so that the stab and elevators
can then be slid in place from the back.

This portion of the 

fuselage was left in during manufacture of the airplane to lend 
support the top of the fuselage during shipping and handling.

10

b. Use a hobby razor saw

and/or hobby knife to cut out the
unwanted portion of wood
between the lines.

c. Smooth the surfaces of the

fresh cuts with fine sandpaper,
and then fuel proof the exposed
wood with some thin CA glue.

a. Start by drawing guidelines

on the rear of the fuselage to 
indicate exactly where cuts
should be made to remove the
unwanted portion. The guidelines
are simply a straight extension of
the top and bottom edges of the
stabilizer slot.

Содержание MAYHEM 40

Страница 1: ...perly assembled powered and flown the MAYHEM 40 can take you into the exciting world of 3D aerobatic flying Generous wing area lightweight construction and huge control surfaces with large amounts of travel enable the MAYHEM 40 to perform the extreme 3D maneuvers you ve been reading about hovering harriers waterfalls blenders the MAYHEM 40 can do them all NOTE The MAYHEM 40 is not suitable for beg...

Страница 2: ...uel Tank Assembly 1 260cc 8 8 oz Plastic Tank 1 Rubber Stopper 1 Metal Front Clamp 1 Metal Rear Clamp 1 M3 x 19mm PH Clamp Bolt 1 Metal Clunk Pickup 1 Fuel Pickup Tubing for inside tank 1 118 od x 1 9 16 long Aluminum Tube 1 118 od x 2 long Aluminum Tube 1 118 od x 2 3 8 long Aluminum Tube 1 bag 2 1 4 Dia White Spinner Assembly 1 Plastic Spinner Cone 1 Plastic Spinner Backplate 1 Plastic Prop Shaf...

Страница 3: ... it cools Note When trying to remove a warp an extra set of hands are needed Have someone assist you While one person holds the reverse twist in the control surface the other person applies the heat by passing a covering iron over both sides of the part WING ASSEMBLY OVERVIEW The wing of the MAYHEM comes in two pieces a right wing panel and a left wing panel which will be permanently glued togethe...

Страница 4: ...ugh the wing panel until the plug on the end of the wire comes out of the opening in the servo bay Be sure you don t pull all of the Y Harness inside the wing leave the other two plugs of the Y Harness outside at the center of the wing Note You may occasionally feel like the wire has become stuck inside the wing This is simply the plug on the end of the servo wire hitting the side of the holes in ...

Страница 5: ... smears on the plastic covering don t worry about them right now Once the glue is dry you can clean the glue smears off the covering with CA Debonder 5 Allow at least 10 minutes before flexing the aileron After sufficient time has passed flex the aileron up and down several times At first you might notice a little stiffness in the joint This will go away after the hinges have been flexed back and ...

Страница 6: ... step Once you have the horn properly located mark the location of the two control horn mounting holes onto the aileron Drill a 1 16 dia hole completely through the aileron at each mark 3 Mount the control horn in place using the Nylon Retainer Plate on the top side of the aileron and two M2 x 15mm Phillips Head Bolts 4 Repeat the last three steps to mount a control horn on the other aileron 5 Not...

Страница 7: ...g the two 1 4 holes in the plate with the holes in the wing before the glue dries Make sure there is no excess glue inside the holes If necessary run a 1 4 dia drill bit through the holes after the glue is completely dry 5 Now permanently glue the Fuselage Bottom Fairing onto the bottom of the wing with thick CA or epoxy glue Let dry 6 a Bolt the wing back in place on the fuselage Locate the two F...

Страница 8: ...gest using a little thread locking compound Loctite on the mounting bolts to keep them from coming loose Note This kit DOES NOT contain bolts for mounting your engine to the engine mounts That s because not all of the engines that can be used in the Mayhem use the same size bolts Some engines may need 4 40 size bolts while others may need 6 32 You will need to go to the hobby shop to obtain the co...

Страница 9: ... cowl Mount the cowl to the fuselage with the four M2 6 x 8mm PWA Screws provided 4 Determine what size and shape opening you will need in the cowling to accomodate your engine s muffler Then cut the opening in the cowling starting small and gradually opening it up to the final size Note As you can see in the next photo the cutout for the YS 63 muffler in our photo model was a fairly simple 5 8 wi...

Страница 10: ...r is easy to assemble If the diameter of your engine s prop shaft is smaller than the hole in the spinner backplate select a prop shaft adapter to fit If your prop shaft is larger than the hole in the backplate the hole can be drilled larger to fit use drill press Install the backplate and your propeller tightly onto your engine using the engine s prop nut and washer Snap the spinner cone in place...

Страница 11: ... screws that came with the servo 2 Mount a control horn on the BOTTOM OF THE LEFT ELEVATOR Locate the horn at the inboard end of the elevator directly in line with the elevator servo The front edge of the horn s base should be located right at the front edge of the elevator s leading edge bevel Once you have the horn properly located 7 The fin can now be permanently glued in place on the fuselage ...

Страница 12: ...h the engine s carburetor throttle arm From the front insert the 3 16 od x 11 3 8 long Plastic Pushrod Sleeve through the firewall 12 mark the location of the two control horn mounting holes onto the elevator Drill a 1 16 dia hole completely through the elevator at each mark Mount the control horn in place with the Nylon Retainer Plate on the top side of the elevator and two M2 x 15mm Phillips Hea...

Страница 13: ...ce of foam rubber between them as shown in the next photo For the receiver antenna we drilled a 1 16 dia exit hole in the right fuselage side at the receiver position The antenna goes through the hole and is string back to the tail of the airplane We and back into the fuselage Notice that there is a slot cut in the first fuselage former behind the firewall for the pushrod sleeve to go through This...

Страница 14: ...ur MAYHEM with normal control throws before attempting 3D rates FUEL TANK INSTALLATION 1 Assemble the fuel tank as shown We recommend that you plumb your tank with a standard 2 tube setup One of the tubes is the vent line through which you will fuel and defuel the tank The other tube is the fuel feed line to the carburetor Note that the rubber stopper for the tank has two holes that go all the way...

Страница 15: ...a dry cloth Squeegee repeatedly to get as much of the water out from under the decal as possible BALANCE THE MODEL While all airplanes must be balanced to achieve flight the balance of an aerobatic airplane like the MAYHEM 40 is especially critical The final placement of the longitudinal Center of Gravity or Balance Point will have a great effect on the aerobatic performance of this airplane Balan...

Страница 16: ...s you gain confidence Take the MAYHEM to a safe altitude and throttle the engine back to idle This will give you a good idea of the glide characteristics While still at idle steadily increase up elevator to get a feel for the stall characteristics Stalls tend to be very gentle with the nose dropping straight ahead with little tendency to drop a wing This is great information to have when set up fo...

Страница 17: ...e and land the airplane Check all servo mountings and pushrod linkages before flying again If a control surface flutttered once it will flutter again under similar circumstances In general some of the things to look at when trying to cure flutter are Loose servo mounting screws or deteriorated rubber grommets Excessive hinge gap Weak or loose control horn Weak or flexible pushrods Poor fit of R C ...

Страница 18: ...0 to 46 2 Stroke 52 to 70 4 Stroke Wing Span 54 1 2 in 1384 mm Wing Area 746 sq in 48 1 sq dm Length 49 1 2 in 1257 mm Flying Weight 4 5 to 5 lb 2041 to 2268 g Wing Loading 13 9 to 15 4 oz per sq ft Radio 4 channel with 5 servos ...

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