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XCell Spectra-G Model – Additional Operators Guide 

Page 3 of 16 

Copyright 

12/5/2004 

Miniature Aircraft USA 

 

Table Of Contents 

 

1.

 

INTRODUCTION

................................................................................................................................. 4

 

2.

 

SO WHAT DO YOU NEED TO KNOW?

........................................................................................... 4

 

3.

 

SETUP GUIDELINES

......................................................................................................................... 6

 

3.1.

 

F

UEL 

S

YSTEM

............................................................................................................................... 6

 

3.2.

 

E

XHAUST 

S

YSTEM

........................................................................................................................ 6

 

3.3.

 

A

IR 

F

ILTER

.................................................................................................................................... 7

 

3.4.

 

S

PARK 

P

LUGS

............................................................................................................................... 7

 

3.5.

 

I

NITIAL 

C

ARBURETOR 

S

ETUP 

 

Z

ENOAH 

G231

............................................................................. 7

 

3.6.

 

T

HROTTLE 

S

ETUP

......................................................................................................................... 8

 

3.7.

 

T

HROTTLE 

G

OVERNORS

............................................................................................................... 8

 

3.8.

 

R

OTOR 

B

LADES

............................................................................................................................ 9

 

3.9.

 

H

EAD 

D

AMPING

............................................................................................................................ 9

 

3.10.

 

P

ITCH 

C

URVES

............................................................................................................................. 9

 

3.11.

 

A

NTENNA 

R

OUTING

....................................................................................................................... 9

 

3.12.

 

R

ECEIVER 

C

RYSTALS

................................................................................................................... 9

 

3.13.

 

C

ARBURETOR 

M

OUNT 

B

OLTS

....................................................................................................... 9

 

3.14.

 

S

ERVO 

S

UPPORT 

B

RIDGES

......................................................................................................... 10

 

3.15.

 

M

UFFLER 

M

OUNTING

.................................................................................................................. 10

 

3.16.

 

W

IRE 

C

ONNECTORS

................................................................................................................... 10

 

4.

 

OPERATING GUIDELINES

............................................................................................................. 11

 

4.1.

 

F

UEL

........................................................................................................................................... 11

 

4.2.

 

O

IL

............................................................................................................................................. 11

 

4.2.1.

 

Oil for Engine Break-In .......................................................................................................... 11

 

4.2.2.

 

Oil for Normal Operation ....................................................................................................... 11

 

4.2.3.

 

Excessive Oil.......................................................................................................................... 11

 

4.3.

 

O

PERATION 

D

URING 

B

REAK

-I

N

................................................................................................... 12

 

4.4.

 

N

ORMAL 

O

PERATION

.................................................................................................................. 12

 

4.4.1.

 

Normal Carburetor Settings.................................................................................................... 12

 

4.4.2.

 

Mixture Troubleshooting ........................................................................................................ 13

 

4.4.3.

 

Hover Settings ........................................................................................................................ 13

 

4.4.4.

 

Full Power Settings ................................................................................................................ 14

 

4.5.

 

S

TOPPING THE 

M

OTOR

............................................................................................................... 14

 

4.6.

 

E

NGINE

/M

UFFLER 

H

EAT

............................................................................................................. 14

 

4.7.

 

C

OOLING 

T

HE 

E

NGINE

................................................................................................................ 14

 

5.

 

TROUBLESHOOTING

..................................................................................................................... 15

 

 

Summary of Contents for X-cell Spectra-G 125-100c

Page 1: ... rs s s G G Gu u ui i id d de e e 1 1 12 2 25 5 5 1 1 10 0 00 0 0C C C 3 D miniature aircraft usa 31713 Long Acres Drive Sorrento FL 32776 Phone 352 383 3201 FAX 352 383 3204 Website www miniatureaircraftusa com E Mail minair earthlink net ...

Page 2: ...XCell Spectra G Model Additional Operators Guide Page 2 of 16 Copyright 12 5 2004 Miniature Aircraft USA ...

Page 3: ... 3 10 PITCH CURVES 9 3 11 ANTENNA ROUTING 9 3 12 RECEIVER CRYSTALS 9 3 13 CARBURETOR MOUNT BOLTS 9 3 14 SERVO SUPPORT BRIDGES 10 3 15 MUFFLER MOUNTING 10 3 16 WIRE CONNECTORS 10 4 OPERATING GUIDELINES 11 4 1 FUEL 11 4 2 OIL 11 4 2 1 Oil for Engine Break In 11 4 2 2 Oil for Normal Operation 11 4 2 3 Excessive Oil 11 4 3 OPERATION DURING BREAK IN 12 4 4 NORMAL OPERATION 12 4 4 1 Normal Carburetor Se...

Page 4: ... is that they will vibrate some When properly adjusted and broken in they will run almost as smooth as glow motors but never as smooth Once setup properly though they will run for a very long time with little attention It s not unheard of to have over 100 gallons of fuel through these motors with just normal maintenance That s a lot of flying time As with glow motors when the correct setup and mix...

Page 5: ... be choked by closing the choke lever and pulled through 4 5 times Then open the choke and the motor should start with 1 2 pulls If you re using the recommended spin starter you won t need the choke Always hold on to the rotor head with one hand when starting the motor to prevent it from accidentally hitting you Any time that the motor has been sitting for a few hours it will idle at a much higher...

Page 6: ...ontaminated with particles of one sort or another The kit is delivered with a very fine fuel filter to minimize the chance that these fuel contaminates can enter the carburetor Several different filters were tested and this particular one offered excellent fuel pickup You may of course use other types of filters although most of the standard glow fuel filters do not adequately filter gasoline beca...

Page 7: ...commended that you purchase the RF Reduction Kit MA Part 125 114 This will eliminate any potential ignition noise 3 5 Initial Carburetor Setup Zenoah G231 As an initial setup use these settings depending upon the carburetor type The Walbro carburetors have the model number stamped on the carburetor body near the fuel inlet These settings are based on average altitude above sea level High altitude ...

Page 8: ...oint you will need to adjust this curve for your particular combination of rotor blades and pitch curves to match your RPM requirements 3 7 Throttle Governors Throttle governors work very will with the recommended throttle setup Although there are several on the market extensive testing has been done with the Futaba GV 1 Use a throttle servo recommended by the governors manufacturer for compatibil...

Page 9: ...e Set the initial high and low pitch settings at no more than 10 degrees and 10 degrees After the motor is broken in you may experiment with other settings however be careful to not excessively load the motor at extreme pitch ranges 3 11 Antenna Routing The model has been tested with both whip and full length wire antennas and both have worked adequately It is recommended to use the full length wi...

Page 10: ...in control of the model 3 15 Muffler Mounting If you have elected to use the optional Hatori Muffler it is important that you securely mount the components together When installing the mounting block to the engine use a high temperature silicon rtv compound as an example Permatex Ultra Black 598B to secure the bolts to the engine This will prevent them from loosening and cause the muffler to possi...

Page 11: ...od quality 2 stroke oil designed to be premixed For engines other than Zenoah follow the manufacturer s instructions for pre mix guidelines 4 2 1 Oil for Engine Break In For the Zenoah G23 G231 G26 it is recommended that engine break in be done using petroleum based oil mixed at 36 1 ratio Most of the yard implement oils such as Poulan and Echo are mineral based and will work acceptably Yamalube 2...

Page 12: ...otor will run fine up until the transition point There is a small portion of throttle travel just above where the setting of the low and high speed needles transition Above that point the high speed needle will significantly affect the mixture The low speed needle is very sensitive Make adjustments in very small increments 1 64 turn at a time Do not make large adjustments to the low speed needle T...

Page 13: ... too lean Continuing to operate at this mixture may result in engine damage Recheck the carburetor needles and adjust to normal settings 4 4 3 Hover Settings At hover when the fuel mixture is correct the model will be very smooth and the tail rotor will sit nicely If adjustment is needed the low speed needle will have the most influence on hover performance Using the normal settings will be very c...

Page 14: ...r and an overly lean setting will result in excess vibration overheating the engine and perhaps seizing it Neither situation will result in optimum power Until you become comfortable with the right sound of the model when the mixture is correct follow this procedure to check the mixture Operate the model at full power for about 5 minutes then land allow the engine too cool and examine the spark pl...

Page 15: ...ect the working tolerances d The motor was running fine and suddenly started to run erratically and won t settle down If this condition continues mostly likely contaminants have gotten in the carburetor orifices We recommend using a pressurized air or other contact cleaner product to blow them out First note the exact position of the high and low speed needles then remove the needles and blow them...

Page 16: ...aken as to whether or not they will match any other reading Always use the same measuring device and always measure in the exact same place on the motor In general terms when measured on the cylinder head on the exhaust side two fins above the exhaust port the model will hover at a head temp of around 275 degrees Fahrenheit and normal full power operation will be around 350 degrees Fahrenheit Your...

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