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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Futaba FASST › crashed two different helis same 2.4Ghz fasst transmitter don't know why
09-18-2009 06:39 AM  11 years ago
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drgnfly004

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seattle Wa

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crashed two different helis same 2.4Ghz fasst transmitter don't know why
i went out tonight to fly my trex 450se and trex 600esp flew 2 batteries in the 600flew great, then switched to the 450 flew about 3 circuts and was passing from left to right in level flight at about 15ft up and 35 ft away to the right when i lost contact but not completely, still had rudder? but nothing else. it flew for 10 maybe 15 ft as i am frantically trying to get it to respond when bang control comes back, now i don't know if i got some type of glitch or just that it came back while i had collective in the wrong spot but it swats its self into the ground HARD. any way it has a bent shaft and some other damage, but i start to try to re create what happened and it is picking up commands just fine. (servos where ok) i walk all over the place trying to get it to do what it did with no luck. i figure something in the aircraft maybe? anyway i put a batt in the 600 and do a range check to be sure no problem so i lift off and start to fly real careful just in case, it seems ok so i start to fly some circuts still ok, i fly around and i am moving real slow about a foot off the deck when bang it goes full collective down. lucky i was on rather tall soft grass no damage at all.
the only similarity is that the aircraft was in the same position relative to the transmitter as the last crash almost exactly, only not the same spot on the field?
the only other thing that was out there was a guy walking around behind me bout 100 ft away on his cell phone, other then that i dont have any idea what happened. checked both helicopters when i got home and found no bad wires or realy anything that could be a cause, i am wondering about a bad potentiometer on my collective but that would not account for the loss of control on the cyclic side earlier.
any help would be great i have over 1000 flights on this fasst 6exh system i use it on helis and planes never had a problem till today.
change is easy, progress that's hard
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09-18-2009 12:36 PM  11 years ago
xcell90

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Michigan

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Could you post a picture how your antennas are set up.

Dave
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09-18-2009 04:52 PM  11 years ago
drgnfly004

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seattle Wa

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yes the antennas are dangling off of the back at as close to a 90deg as i could get while pointing down at about 45deg i have flown this way for ever with no problem literally 100s of flights in all kinds of conditions with no problems i have never loaded a photo onto a post before i hope it works it looks overly complex for something that simpleany way if it dose not load it is in my gallery

change is easy, progress that's hard
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09-19-2009 11:25 PM  11 years ago
Thomas L Erb

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Alliance ohio

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although the antennas look fine in the pics i would say they are going to be moving around or coming together during flight. you should really have the mounted in some form as to keep them at 90 deg to each other for best coverage. if they both streamline and come together it negates the coverage provided by the duel antenna system. just a thought

Tom
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09-20-2009 01:05 AM  11 years ago
carcrasher

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east coast

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I agree with Tom. Mount them so they can't move 90 degrees to each other. I would say it could've been the cell phone but I don't know if the Fasst system is prone to problems with nearby cellphones as the 72mhz modules were for Futaba, plus you said he was far away.
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09-20-2009 01:22 AM  11 years ago
JeffKollin

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Jenison, MI

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Had it happen while flying one of my airplanes although not fun but concerning.
The problem I see i the end of the reciever wires are facing the same direction (in line with each other but facing the other way. It does not work that way and is probrably the reason for the loss.Send 1 antenna straight back and the other off to the side of the heli.The only part of the anttena that needs to be 90 degrees from each other is the end of the anttena portion that is not covered. This is the important part of the anttenas.
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09-20-2009 06:52 AM  11 years ago
drgnfly004

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seattle Wa

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I will try Setting the antennas up So they Don't move, and mount Them differently. I will say I have flown this way since I put The fast system in, that was in 04 I think, and Have Literally over 1000 flights in this setup with no trouble on my Trex 450. But it can't Hurt to set it up better, I like the way you explain of putting one straight Back and The other out at 90 Deg. I can Probably mount Them to a plastic rod and attach it to The boom supports. I Have Always been reluctant to mount The Antennas to the supports directly as they are maid of CF and I have all way worried about interference from CF. if any one has a picture of how you have mounted The antennas on yours please post Them I world Like to see Some good ideas.change is easy, progress that's hard
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09-21-2009 07:57 PM  11 years ago
drgnfly004

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seattle Wa

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well i went out to the field this weekend and flew all 4 of my helis after making some changes to how the antennas where mounted and had no problems with any of them. although there was know one else out there on a cell phone this time either, but i will keep the way there set up now and see what the future holds, thanks for all the input.change is easy, progress that's hard
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09-25-2009 01:29 AM  11 years ago
JeffKollin

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Jenison, MI

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2.4 glich
Glad to see it worked out for you.
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