futaba fasst 2.4?????

[custards1]

Well **** happened today.
Its the first time we have had any issue with any planes.
To start with it was maiden flight on a small 40 size scratch built low wing sports type plane called a cracker jack. it had a brand new futaba fasst 7 channel rx and dad was flying on his new fga12. take of went ok i was helping him trim the plane when he said i lost it? the plane went in a spiral turn and went in. dad had no control at all. very strange. We spent the rest of the day trying to work out what went wrong. the battery 1100mah 4.8v nicad was not new but still in good working order and had just been charged within the last 30 mins. from what we can tell the plane lost all power. when we got to the plane it was working fine? we have since retested the battery with a load meter and checked out to 5.0 volts so fine. the plane did not go into fail safe as the motor power did not come out nor did it come out when the stick was move back at the time. the plane is runnig 5 servos 4 standed hitecs and 2 minis on the rons so should not be able to draw anywhere enough power to spike the pack below safe. and from what we tested after there is no reboot time so should have come back online if it did . we can not see and lose connection and still working fine after the event. dad and i both flew after on 2.4 and did not have any issues at all. i would like to get to the bottom of this as we have both spent alot of money buying in to it

Please help?

[Sukhoikid]

Are the antennas mounted correctly? Are they near a working servo or battery? I know on smaller 40 size planes I will cut two small holes in the bottom of the fuse to let the antennas stick out at their 90 degree angles so it is away from everything. How old exactly is the battery? Did you cycle the battery before using it since it may have not been used in a while?

[DougV]

I don't think it has nothing to do with signal or battery voltage since the system didn't go to failsafe, if it was because of a voltage drop then at 3.7v the throttle will have gone into failsafe, I think you lost power to the receiver, look at the switch, bad connection.

Doug.

[torquen]

Why would you instantly put a threat on Flying Giants blaming "Futaba Fasst". I think Futaba Fasst is the least of your problems concerning your crash. People when technology advances you cant just start updating one item at a time. I have found this out watching friends build planes this last couple of years. In this case your using a small 4.8 volt nicad pack. I would say at a min you need to be running a 5 cell pack. I would guess its something that has to do with a loose plug or a faulty switch. If I was the two of you I would not use any of the electronics coming out of this plane in your next one. If you do your just asking for a problem again.
Garrett Morrison

[Sukhoikid]

In my small profiles I usually run a 4.8 nmh pack. Not Nicad. I havnt had any problems due to not much of a load. But my batteries I know are new and up to date.

[custards1]

Im not blaming futaba fasst for the crash at all from what i know it looks more like a connection for sure. i just want to try and get to the bottom of this so it does not happen again as we have both invested in it. the thing being it did not go into fail safe i re checked it after the flight and it sould have cut the throtle of and it did not and was all working fine

[Borries]

	Quote: Originally Posted by torquen
	Why would you instantly put a threat on Flying Giants blaming "Futaba Fasst". I think Futaba Fasst is the least of your problems concerning your crash. People when technology advances you cant just start updating one item at a time. I have found this out watching friends build planes this last couple of years. In this case your using a small 4.8 volt nicad pack. I would say at a min you need to be running a 5 cell pack. I would guess its something that has to do with a loose plug or a faulty switch. If I was the two of you I would not use any of the electronics coming out of this plane in your next one. If you do your just asking for a problem again. Garrett Morrison

I agree with Garret

"Im not blaming futaba fasst for the crash at all from what i know it looks more like a connection for sure."

Looking at the title of this threat, it sure looks like you are pointing at Futaba Fasst !!!

Cheers
BB

[Pilotpete]

I think DougV hit the nail on the head.
Just last week I almost lost my trusty old 4 Star 60 to a bad switch harness. The plane started glitching very noticeably in the air, lucky to got it on the ground in one piece. The harness was a heavy duty switch with the charge jack built in. The switch didn't fail, as I had assumed. After replacing the switch harness, I found that the negative wire had come loose from the little circuit board, only the snap in back plate was keeping any pressure on the joint to maintain a connection, probably a cold solder joint from day one.
Give that switch harness a good going over, look for any sign of an intermittent connection.
It's a real bummer when things fail like that, but the our planes are always "seconds from disaster"
Good luck,
Pete

[crazyjoe]

Maiden flight tells me it could have been anything. Put the receiver in a plane your not that fond of and give it a test.

[Ira d]

	Quote: Originally Posted by torquen
	Why would you instantly put a threat on Flying Giants blaming "Futaba Fasst". I think Futaba Fasst is the least of your problems concerning your crash. People when technology advances you cant just start updating one item at a time. I have found this out watching friends build planes this last couple of years. In this case your using a small 4.8 volt nicad pack. I would say at a min you need to be running a 5 cell pack. I would guess its something that has to do with a loose plug or a faulty switch. If I was the two of you I would not use any of the electronics coming out of this plane in your next one. If you do your just asking for a problem again. Garrett Morrison

I dont see where he blamed Futaba, And as for as as the four cell pack me and many others
have been useing them for years with no problems. I have two planes using Fatuba Fasst one
has a 607 receiver running on four cells it by the way is a 40 size plane. I also have another
plane that runs on 5 cell packs but the voltage is regulated down to 5.2 volts with no problems.

[JoeAirPort]

We see many threads like this. The title is very clear as to what the author of the thread thinks is the problem. You know from a reliability stand point, the Fasst receiver is the most bullet proof component inside your fuse. And it's the least likely to cause the problem. The most likely is user error...then it's the cheap component failure like a switch harness or battery. And even there it can still be the user neglecting to properly charge the battery or replace parts when they are old...or crashed. Again I say the last thing you should be looking for is a faulty Fasst receiver. Very unlikely.

[davensocal]

Custards-
Sorry you lost a plane.. I recently lost a little larger plane on maiden, it is painful..

Sounds like you are on the right track by looking at a power failure.. I sure hope you can find the root cause, it's hard to move forward if you don't find it.. (no root cause found on mine)

Is the plane still intact enough that you can run the engine and give it a vibration test? If you haven't disturbed the wiring too much it might show the problem again..

[custards1]

cant run the motor at all. it hit a road and broke the muffler clean off.

sorry if i miss lead with the title i was in no way shape or form trying to blame the fasst system. both dad and i flew the rest of the day on it including a 20% 41cc plane.

switch might be a place to look i checked all connections after and all felt tight. its not a charge switch but knowing my tight ass dad it would only be a cheap switch . part of the problem was it was all still working fine upon finding the plane so if it was a lose wire it must have settled back into place

[JAS]

When I first got my 6EX Fasst I put it in everything I had, including my prototype planes. The only issue I had was when my friend and I were flying the same plane and he went to do a snap but the plane didn't react the way it should have (it didn't snap). Not knowing, he finished the flight (contest round), came down and told me about it. I asked him to wiggle the sticks and when he did and you could see the servos were really slow. Turns out the battery was reading 3.8V under load. I asked him if he noticed it while he flew after the snap... his reply "the plane was so smooth, I didn't think anything of it"...lol. I asked him next time it was 'really smooth' to land. We fast charged the 4-cell pack and flew another 4 flights after that. 1.20 and under, 4-cells should be fine. I personally think it's just how many MH you're willing to carry around, but whatever you choose... make sure you have twice the best guess needed.

[custards1]

The battery tester we have is meant to be load teaster. after the flight it was holding a solid 5v we left it running for some time and it did not move at all. im not sure how much load it has but really how much current can 3 standard and 2 minis draw. the servos are nothing great and did not expect them to be able to draw enough to have an issue. my trainer is running 4 standard and a 4.8 volt battery and no problems yet. so does have me thinking more that it was a switch or wire problem