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Old Jan 30, 2013, 11:28 PM
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Joined Jan 2013
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Just purchased the 9104. it was previously flown and could have been crashed. I took it home and powered it up. at the slightest throttle up the heli immediately starts to rotate left and the tail rotor spins at maximum speed. Putting full left on the stick and adjusting the gyro full left only slows it down slightly but not enough to prevent the rotation. HELP!!!
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Old Jan 31, 2013, 12:08 AM
LearningFast
United States, LA, Denham Springs
Joined Jan 2012
410 Posts
Did you charge up the battery fully? One of the indications is that the tail motor is the first to start loosing power and does what you described. Another is a weak tail motor. These fail quite often on these helis. I have been through quite a few of them.
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Old Jan 31, 2013, 11:31 AM
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Finland, Tuusula
Joined Mar 2012
181 Posts
Here is some pics of my DH 9104

http://www.rcgroups.com/forums/showt...4#post23990022
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Old Feb 01, 2013, 10:04 AM
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Joined Dec 2012
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i just put a different fly bar on off of gt qs 8004 helicopter had to drill out the pin hole a little.i haven't had it out yet waiting for a few other parts to come in.i hope i didn't mess this up doing this dog bones are in a different angle so not sure about this when other parts come in and i try it i will update this item!i'am just trying to get rid of the metal flybar like on the 9118.
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Old Feb 01, 2013, 01:55 PM
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Joined Jan 2013
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I charged it fully. Same issue. just keeps rotating to the left. I hold it in my hand and the rear blades seem to be spinning at maximum speed. full right on the stick only slows the tail motor a bit but not enough to prevent the rotation.....any other suggestion?
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Old Feb 01, 2013, 08:05 PM
LearningFast
United States, LA, Denham Springs
Joined Jan 2012
410 Posts
Well! Either the battery is defective and it cannot supply enough power to overcome the torque of the main blades, usually in flight this is what happens when it starts to get low, or the tail rotor motor is defective. Does it good altitude with the main?
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Old Feb 04, 2013, 02:37 PM
Brakes? Who Needs Brakes?
United States, WV
Joined Jun 2012
36 Posts
After all my troubles with the 9104 and tail rotor and main motors.. I finally replaced the whole tail unit with one from the MJX F45.

I used the tube from the 9104, the rotor housing, fin, motor, and blade from the MJX.
I had to change the connector wires around though because the blade spun the wrong way.
I replaced the main motor with one for the MJX F45 and now... this thing flies like a Dream!

It no longer has the Left Spin issue and it even flies faster and much more stable.
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Old Feb 06, 2013, 07:20 PM
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Joined Dec 2012
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my 9117 tranmitter and pc board just came in i put everything together and cant get it to sink together iwnated to check the servo and see if i have pluged in in the right spot but all i can get is the lights to flash nonthing more any ideas
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Old Feb 06, 2013, 08:46 PM
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[QUOTE=timg734;24055852]my 9117 tranmitter and pc board just came in i put everything together and cant get it to sink together iwnated to check the servo and see if i have pluged in in the right spot but all i can get is the lights to flash nonthing more any ideas[/QUOTE




well i watched a youtube and got it to sink but now it only spin in circle and seperates the swashplate and the swashplate is one for a 9117 anyone have any ideas what i did wrong
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Old Feb 06, 2013, 08:52 PM
LearningFast
United States, LA, Denham Springs
Joined Jan 2012
410 Posts
A video of the main rotating and the tail rotation would be nice. I do take it the main is spinning clockwise and the tail is spinning in the opposite direction?
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Old Feb 07, 2013, 08:38 PM
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Joined Dec 2012
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yes the main blades spin clockwise and the tail spins counterclockwise i that is while looking at it from the blade side of the boom.it does get off the gbut it only spins around in circle
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Old Feb 07, 2013, 09:29 PM
LearningFast
United States, LA, Denham Springs
Joined Jan 2012
410 Posts
Have you changed the rear rotor motor? I know they are weak and I have gone through a few of them. Earlier, jscrepair did some mod to the tail from the mjx f45 tail section and is very happy with it.
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Old Feb 08, 2013, 07:08 PM
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Joined Dec 2012
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yes i changed the rear boom and motor to one from a 9101 and shortened boom to same length as the 9104 boom had to drill boom suport to mount the new assembly
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Old Feb 08, 2013, 07:11 PM
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Joined Dec 2012
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i also chage flybar to one off of gtqs8400 but also changed it back but still does the same thing no change from that
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Old Feb 08, 2013, 11:05 PM
LearningFast
United States, LA, Denham Springs
Joined Jan 2012
410 Posts
9101 tail???? Is that a typo? If not, that is a coaxial and there is no way that motor can keep up with the torque of the 9104 370 motor. A 9116 or 9118 series fixed pitch heli tail will do, as they are basically all the same. These are weak tails and don't last long. Look up the modifications of TrumpT. He used the tail from an MJX F45 and he says it worked out well and may last longer. I did quite a few mods on mine, but it is on the shelf for now until I finish my 450. I plan keeping the frame, but put in a brushless main and rear motors with a variable pitch on the rear just like my 450. The 9104 is the size of a 250.
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