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Problem with multiplex Heron after crash

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Problem with multiplex Heron after crash

Old 02-07-2021, 05:46 AM
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Default Problem with multiplex Heron after crash

Hi, im new to this forum.

It's been a while since I did my last RC plane flight.
Im having a problem with my multiplex Heron after I hit a tree.

It got stuck in the tree and I couldn't grab it (the tree was like 12-15 meters high) (rough calculation) so I couldn't get it out.
The cockpit, and wings fell of and they were basically gone (there were multiple trees and it basically came to a full stop after it got to the third tree).

After the crash I turned off my transmittor but the plane started it motor and went to full speed. It basically destroyed the propellers (blades).

I eventually got the main body off the plane out of the tree and a couple days later someone brought me the wings and cockpit, they fell out the tree because of the wind).

My plane got out pretty good because it was a really nasty crash.

The problem is, whenever my transmitter is on 0% throttle the plane still goes at 10% and I changed no setting, it worked fine before.

The dangerous thing is (and really annoying) I can't turn off the plane without taking the battery out once its on!

When I turn off my transmitter the plane goes haywire and goes at full trottle wich is pretty dangerous since it can hurt someone/ me.

I haven't flown with it ever since because I don't know how to fix the problem. Ive tried changing some settings in the transmitter and it sort of worked.
I can turn off the motor WHILE the transmitter is ON but I can't go full throttle because it goes into negative (-100%) throttle when it is supposed to be at 0%.

And the plane still goes full throttle when the transmitter is off!!!!

This was really painfull because it took us and hour and a half to get the plane out of the tree and I got out of range to get a ladder so the plane started to destroy itself while it was cutting the tree.

Does anyone knows what causes the problem? Because I can't find anything and I don't know what to replace.
Old 12-03-2021, 05:54 PM
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I'm assuming it's electric.

first, replace the electronic speed control (ESC)
second, put a switch between escrow and battery.
third, set up your fail safe defaults in your transmitter. Read the instructions on that as it differs from one reciever brand to another.

But, chances are, your esc is messed up from the crash so it's gotta be replaced. You also need to check the motor, make sure the shaft didn't bend from the running prop strike. The switch (about ten bucks) gives you a way to set off power between the battery and ESC quickly without fighting to disconnect the battery should you have another issue.
Old 12-04-2021, 06:47 AM
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The first rule of R/C anything is to never have the receiver turned on unless the transmitter is on as well. Secondly the ESC is going to full throttle with the TX off because the failsafe has not been set.

Your first step here would be to read the instructions to re calibrate your ESC. This would involve returning your TX throttle settings back to default. Then follow the instructions to recalibrate the ESC then follow the radio instructions to set the failsafe. The TX instructions should also cover setting up a throttle cut switch that will inactivate the ESC.

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