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Home✈️Aircraft🚁HelicopterBeginners Corner › Falcon 40 problem
04-04-2010 03:12 PM  10 years ago
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Hibigibe

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Canada

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Falcon 40 problem
Hi everyone,

I own a Falcon 40 4channel rc helicopter and i'm having a bit of trouble with it since i crashed it into a window curtain.

Ever since i crashed it, it has trouble spinning in the air. On the ground with the anti crash kit ( 4 sticks with ping pong balls ) the helicopter will turn left or turn right without any problems. But as soon as it lifts off the ground that's when the trouble starts.

It will turn left fine in the air but it won't turn right at all.

Any help is appreciated!
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04-08-2010 12:24 AM  10 years ago
RobotronskiRR

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Mississippi

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Hib,

Here is a post I submitted on the Falcon 40 site at RCU way back when. It may help you diagnose your problem.

If you want to get an appreciation for gyro operation do this test:

1. Unplug the connector supplying power to the main motor. (Important step please do 1st)Just follow the wires from the bigger motor.
2. Turn on the transmitter, set throttle to lowest setting.
3. Plug in heli battery
4. Hold heli in your hands by the main landing gear
5. move the throttle to about 1/3 position, the tail rotor should now spin.
6. Hold the heli steady and you'll hear the tail spin at a fixed RPM.
7. Now , suddenly move the heli as if it were pivoting on the main rotor axis and you'll see the tail rotor RPM rise or fall
depending on the direction of movement you are providing.

The gyro is simply compensating for induced movement by either adding or subtracting power to the tail rotor.

Hope this helps, Robo

This is a quick/fun method to test a gyro if you suspect a problem.
Take-Offs are Optional ; Landings are Mandatory!!!
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04-08-2010 10:46 PM  10 years ago
Hibigibe

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Canada

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Wow, thanks alot for the test. I will try it as soon as i get to my heli and will let you know how it went.

Thanks a bunch!
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04-18-2010 09:25 PM  10 years ago
Hibigibe

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Canada

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falcon 40
Sorry for the long delay, but i've been extremely busy.

Anyways, i tried the gyro test and the tail motor does rise and fall if i move it.

But it still hasn't solved my problem.
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04-25-2010 03:09 PM  10 years ago
Hibigibe

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Canada

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i've taken the heli apart to inspect the parts, and everything is good. tail motor was a bit loose so i tightened the screws and put a tie-rap to hold it better.

Also, i've noticed a beep that happens when i try the tail motor alone.
It's the same type of beep when i plug the battery but it's more continuous. And also, it beeps or adjusts itself for no reason when it's just sitting there(idling but with the power on, no throttle)
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04-25-2010 07:43 PM  10 years ago
chickens2252

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Okinawa

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Hib,
I don't have a falcon 40 but I've had several like it. It is clear that if your gyro is working that right turns means that you don't have enough power in your tail drive. My first guess was that the pinion had a crack and was spinning on the shaft but it looks like the pinion is brass so that is un-likly. Make sure that with the motor off the rest of the parts spin free. It is common for the tail rotor to get pressed down on the shaft and add friction. Lastly you may have burned out the motor. I have read else where that people are complaining of very short life on the tail motors for this heli. As little as 5 to 6 flights. Most recommend a heat sink.
Good luck.
Bob
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