background image

PITTS

        

                  

Item code: BH85-A

                                

Instruction Manual

17

 

1)

 We highly recommend setting up a plane using 

the control throws listed.

 

2) 

The control throws should be measured at the 

widest point of each control surface.

 

3) 

Check to be sure the control surfaces move in 

the correct directions.

Control throw Ailerons:

 

 

Low: 10 mm up / down, 10% expo.

 

High: 15 mm up / down,10% expo.

Control throw Elevators:

 

 

Low: 15 mm up / down, 12% expo. 

 

High: 20 mm up / down, 12% expo.

Control throw Rudder: 

 

Low: 20 mm left / right, 15% expo. 

 

High: 25 mm left / right, 15% expo.

CONTROL THROWS

10mm
10mm

15mm
15mm

20mm
20mm

Aileron control

Elevator control

Rudder control

 

1)

 Completely charge your transmitter and receiver 

batteries  before your first day of flying.

 

2) 

 Check every bolt and every glue joint in  your 

plane to ensure that everything is tight and well bonded.

 

3) 

 Double check the balance of the airplane.

 

4)

 Check the control surface.

 

5)

 Check the receiver antenna . It should be fully 

extended and not coiled up inside the fuselage.

 

6)

 Properly balance the propeller.

We wish you many safe and enjoyable flights with 

your PITTS.

PRE-FLIGHT CHECK

of pieces of masking tape, place them on the top side 

of the wing

 106mm

 back from the leading edge, at the 

fuselage sides.

 

3) 

 Turn the airplane upside down. Place your fingers 

on the masking tape and carefully lift the plane.

Accurately  mark  the  balance  point  on  the  top  of  the 

wing on both sides of the fuselage. The balance point 

is located 

106mm

 back from the leading edge. This is 

the balance point at which your model should balance 

for your first flights. Later, you may wish to experiment 

by shifting the balance up to 10mm forward or back to 

change the flying characteristics. Moving the balance 

forward may improve the smoothness and arrow- like 

tracking, but it may  then require more speed for take 

off  and make it more difficult to slow down for landing. 

Moving the balance aft makes the model more agile 

with a lighter and snappier ”feel”. In any case, please 

start at the location we recommend.

With the wing attached to the fuselage, all parts of the 

model installed ( ready to fly), and empty fuel tanks, 

hold the model at the  marked balance point with the 

stabilizer level.

Lift the model. If the tail drops when you lift, the model 

is “tail heavy” and you must add weigh* to the nose. If 

the nose drops, it is “nose heavy” and you must add 

weight* to the tail to balance. 

*If  possible,  first  attempt  to  balance  the  model  by  

changing the position of the receiver battery and  re-

ceiver.  If  you  are  unable  to  obtain  good  balance  by 

doing  so,  then  it  will  be  necessary  to  add  weight  to 

the nose or tail to achieve the proper balance point.

CG

106mm

106mm

Summary of Contents for Pitts BH85-A

Page 1: ...r type Aluminium Hi grade for main gear and spring wire for tail gear included Parts listing required not included Radio 06 channels SPECIFICATION PITTS Servo 07 servos Servo mount 42mm x 21mm Engine...

Page 2: ...bilizer with pre installed rud der 1 Horizontal stabilizer with pre installed elevator halves To avoid scratching your new airplane do not unwrap the pieces until they are needed for assembly Cover yo...

Page 3: ...e film covering due to major fluctuations in weather conditions temperature humidity etc in rare cases you may even find a slight warp in a component These minor faults are in the nature of film cover...

Page 4: ...C A to center of hinge on both sides Temporary pin to keep hinge centered 1 INSTALLING THE AILERONS I AILERON Test fit the ailerons to the wing with the hinges If the hinges don t remain centered stic...

Page 5: ...ock of wood for each of the four mount ing screws provided with the servo Electric wire Drill a hole 1 5mm 2x10mm Secure 5 Repeat the procedure to install the aileron servos in the other wing half 3 I...

Page 6: ...out 6mm beyond the blend Flaslink Pushrod wire Control horn Repeat the procedure to install the opposite wing half See pictures below See pictures below II INSTALLING THE ENGINE MOUNT OPTION 1 ELECTRI...

Page 7: ...nk and move freely inside the tank Connect one end of the line to the weighted clunk and the other end to the nylon pick up tube in the stopper 3 Carefully bend the second nylon tube up at a 45 degree...

Page 8: ...silicon sealer to the forward area of the tank where it exits the fuselage behind the engine mounting box and to the rear of the tank at the forward bulkhead Do not secure the tank into place permanen...

Page 9: ...he fuselage by taking measurements but don t glue anything yet B B A A 3 Slide the cowl back over the engine and secure it in place using four wood screws See picture below 4 Install the muffler and m...

Page 10: ...n cutting through the covering to remove it cut with only enough pressure to only cut through the covering it s self Cutting into the balsa structure may weaken it This could lead to possible failure...

Page 11: ...o system Bottom side M2 Lock nut M2 Elevator pushrod Bottom side Elevator pushrod Bend 90 degree Top side C A glue Bottom side C A glue Elevator servo Secure Cut Flaslink Pushrod wire servo arm Secure...

Page 12: ...install as same as the way of elevator pushrod Please see pictures below Rudder servo install as same as method of elevator servo Rudder control horn install as same as method of elevator control hor...

Page 13: ...the rudder hinge line and the tail wheel bracket should be centered on the plywood plate VIII MOUNTING THE TAIL WHEEL BRACKET Aluminium landing gear Collar M5 nut Flat washer 3 x 12mm 2 Mark the loca...

Page 14: ...the model 4 Using a 2mm drill bit drill a hole through the side of the fuselage near the receiver for the antenna to exit X INSTALLING THE RECEIVER AND BATTERY Locate the aluminium wing dihedral brace...

Page 15: ...is aligned with the rear edge of the cockpit opening Use canopy glue to secure the canopy to the canopy hatch Use low tack tape to hold the canopy in position until the glue fully cures Wrap the tape...

Page 16: ...SPINNER BALANCING 1 It is critical that your airplane be balanced cor rectly Improper balance will cause your plane to lose control and crash THE CENTER OF GRAVITY IS LOCATED 106MM BACK FROM THE LEADI...

Page 17: ...the airplane upside down Place your fingers on the masking tape and carefully lift the plane Accurately mark the balance point on the top of the wing on both sides of the fuselage The balance point is...

Page 18: ...to an explosion Keep all onlookers especially small children and animals well back from the area of operation This is a flying aircraft which will cause serious injury in case of impact with a person...

Reviews: