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Mikado
Other › Gone with the wind... again
05-03-2005 02:56 AM  13 years agoPost 1
Tobias2

rrNovice

Pharr, TX-USA

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Dear Sirs,

This is my 2nd heli that flies away after few minutes carrying a small camera -did it many times before-. I don´t know what happened. It just didn´t respond to my Tx anymore. It did keeps the main rotor spinning and going away slowly with the wind until it crashed very far from me.

When I recovered the heli...parts I saw the Futaba S9650 DIGITAL MINI plastic geared servos became striped again, may be because of the impact or because the extra weight.
I ´m not sure what´s going on really. I´m concerned about it. It may hurt some one in a far spot. Can any of you have an idea about what may be the problem ?

Thank you in advance.

Tobias2

LOGO 10 3D: 5S3P, C50 15L, Phoenix 80 ESC,13Teeth,GY401, Digital Servos S9650, Tx 9CH-PCM

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05-03-2005 05:45 AM  13 years agoPost 2
Ninjak2k

rrApprentice

Centreville, VA

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Well, it sounds like you had a PCM lockout, meaning your receiver lost the signal from your transmitter and went into failsafe. If this was obvious and you already knew this, I apologize, but you said you didn't know why it happened and that would be what happened.

The question then is why did it go into failsafe? Did you perform ground range checks to verify a good signal? About how far away were you flying when you lost control?

You didn't indicate if you were using a receiver battery or an external BEC. I guess another possibility is a switch failing or your receiver becoming unplugged if using a receiver battery. Or the crystal vibrating out of your receiver.

Good luck,
Dan

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05-03-2005 06:11 AM  13 years agoPost 3
Tobias2

rrNovice

Pharr, TX-USA

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Hi Dan,

Thank you for your kind answer.

I already checked my transmitter and the Fail Safe is in Normal position instead of a % of every channel value . I think that means that Fail Safe will not operate when a bad signal or noise happens. Am I right ?

I did not performed a range check (never had any problem with this but I will do it from now on). I was flying about 50 yards away when it happened. However, two minutes before I was flying 150 yards away with no problem. The heli started to do not obey the Tx when it was closer. That is very strange.

I´m using a H-UBEC. I´m ground testing the receiver and it works OK.

Tobias2

LOGO 10 3D: 5S3P, C50 15L, Phoenix 80 ESC,13Teeth,GY401, Digital Servos S9650, Tx 9CH-PCM

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05-03-2005 07:50 AM  13 years agoPost 4
Stet

rrElite Veteran

Key Largo FL

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set your failsafe to turn the throttle off

if the receiver was crashed before and not replaced or repaired, that is a likely cause for this crash

range check the heli with the motor running (you can set your pitch curve to a constant -2 degrees) when you reach the limit, the motor will shut down because you set failsafe to turn it off

do the range check from a variety of directions from the heli

Are you using a base loaded antenna? If using a standard antenna, where is it routed? If a base loaded antenna, is it bent or curved to insure no "blind spots"?

keepin' it real

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05-03-2005 02:38 PM  13 years agoPost 5
Chas Coxsedge

rrNovice

East Sussex UK

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Just a thought, but you mentioned the heli was taken away by the the wind, did you have enough negative pitch to overcome transational lift ?

Charles

Eolo Pro-Logo 10-Logo 14

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05-03-2005 05:03 PM  13 years agoPost 6
Tobias2

rrNovice

Pharr, TX-USA

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Stet and Charles,

Thank you for your kind comments.
Here are the answers to your questions:

I´m using the standard antenna and it is routed on the bottom of the landing bows through the rings intended for it with the plastic tube. It is exactly as it has been in every of my helis.

I had -3 of negative pitch.

I will do the range check as you described.

However, I need to know if it is possible to strip the servo gears in flight with hard 3D´s and extra load.

Thanks

Tobias2

LOGO 10 3D: 5S3P, C50 15L, Phoenix 80 ESC,13Teeth,GY401, Digital Servos S9650, Tx 9CH-PCM

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05-03-2005 05:34 PM  13 years agoPost 7
Stet

rrElite Veteran

Key Largo FL

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gears should not strip from flight loads, especially not the 9650

make sure you have a torroidal ring on the lead from the esc to the receiver

upgrade to a revolution base loaded antenna

get a UBEC from http://www.rchover.com or someone else.

I could go on all day

keepin' it real

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05-03-2005 06:06 PM  13 years agoPost 8
Tanner Hall

rrApprentice

A2, MI

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i'm not sure a base-loaded antenna is an upgrade. i've had trouble with these, particularly after cutting the length of the stock antenna. range was greatly reduced over stock and i had more glitches. imo, a good pcm RX with the standard antenna (properly routed) gives the best range.

tobias, sounds like your RX (or TX?) is defective. try swapping it out and rechecking your range with the TX antenna collapsed.

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