Powerfail
04-24-2013, 05:43 AM
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Powerfail
Hello,
Just got back from a jet event with a bent F20 Tigershark. My jetcat 160 SE went Dead Stick 5 minutes into the firstFlight and i overshot the runway. [ My Fault ]
The Engine is Gas start and i run a NIMH 2400 pack. Fully charged3 days before flight. 8.4 volts. Pack is 18 months old with little use.
Start and run up fine. After stopping , voltage was 7.4 Volts
I have looked at the data and voltage drop went down to 7.2 volts in flight during a couple of timeson verticals. I was cruising when the engine stopped
I do take responsability as i should have charged the day of the flight.
Now, that i amfixing the jet please advise what i should replace.
My plan is to now use a new7.4 volt lipo 4400 mha pack.
Could there be an issue with the Data cable ?
As the Tigershark is long,could the long distance of the power cable made a differance ?
PS
This is my 4th Jetcat, and i am more than happy with all of them
Regards
John
Just got back from a jet event with a bent F20 Tigershark. My jetcat 160 SE went Dead Stick 5 minutes into the firstFlight and i overshot the runway. [ My Fault ]
The Engine is Gas start and i run a NIMH 2400 pack. Fully charged3 days before flight. 8.4 volts. Pack is 18 months old with little use.
Start and run up fine. After stopping , voltage was 7.4 Volts
I have looked at the data and voltage drop went down to 7.2 volts in flight during a couple of timeson verticals. I was cruising when the engine stopped
I do take responsability as i should have charged the day of the flight.
Now, that i amfixing the jet please advise what i should replace.
My plan is to now use a new7.4 volt lipo 4400 mha pack.
Could there be an issue with the Data cable ?
As the Tigershark is long,could the long distance of the power cable made a differance ?
PS
This is my 4th Jetcat, and i am more than happy with all of them
Regards
John
04-24-2013, 06:45 AM
#3
RE: Powerfail
2 cell lipo is fine.
Long data cable is fine, try not to run it next to servo lines over long runs.
Long power cables can cause voltage drop. Not too bad on a gas start.
Do you know what your off condition was?
Sorry about the damage. That is always a pain.
Long data cable is fine, try not to run it next to servo lines over long runs.
Long power cables can cause voltage drop. Not too bad on a gas start.
Do you know what your off condition was?
Sorry about the damage. That is always a pain.
04-25-2013, 05:51 PM
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RE: Powerfail
For receiver/servos I use 2 A123 (redundant) packs without voltage regulators and have had zero problems in two years. I personally don't like NIMH packs. A123 are easy to charge, balance and check for voltage and balance before each flight.
Dave
Dave
04-26-2013, 02:28 AM
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RE: Powerfail
Hello,
There was no problem with the receiver battery,s. Looking at the Data the NIMH pack was fairly stable at 7.2 Volts during flight.
Hello Matt,
Where do i find Off Condition. I will try to send you the Data when i can.
Is there a specific voltage the ECU shuts down at ?
Regards
John
There was no problem with the receiver battery,s. Looking at the Data the NIMH pack was fairly stable at 7.2 Volts during flight.
Hello Matt,
Where do i find Off Condition. I will try to send you the Data when i can.
Is there a specific voltage the ECU shuts down at ?
Regards
John
05-05-2013, 05:42 AM
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RE: Powerfail
No Luck Confirming issue so far, Battery Voltage not perfect , but ok at 7.2 volts under load. Cut the Battery open today and it was in Perfect Condition. Leads so far all tested ok. Fuselage repair going well.RegardsJohn
