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Home✈️Aircraft🚁Helicoptere-Electric General Discussion › Trex 700 Loss of Power
02-21-2016 02:20 AM  4 years ago
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JJC1988

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Germantown MD USA

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Trex 700 Loss of Power
I have been having some trouble with my 700 . My setup has been flying fine since I got it until recently when one day I noticed it was making good power but didn't seem like the power was all there . The fourth flight of that day the esc went into a soft cutoff. It got worse to where I could only take off and if I pitch pumped it went into soft cutoff. I noticed burn marks in the 850mx (490kv) motor so I went ahead and used the align program and got sent a new one . I put the new motor in and this time the helicopter would spool up but didn't have the power to get off the ground into a hover .I figured the esc was also bad. I sent my Castle 160 Edge HV in and also got sent a new one . Today I went to test and the same thing happened not enough power to get off the ground . I then changed from gov mode to fixed endpoints and put a throttle curve in for testing. The helicopter made more power and got off the ground for 10 seconds . I landed tried to take off again and did not have enough power to come off the ground again . My setup is Silver Vbar 5.3 pro with a 6303sb . I use a pulse 2s rx pack that goes straight to the vbar split in two slots . My revolectrix battery's seem to be in good condition. If anyone could shed some light from my graph or had a problem similar I would greatly appreciate it !

My Castle Graph from my last flight with the new motor and esc

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02-21-2016 10:08 AM  4 years ago
EEngineer

rrProfessor

TX

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Check all of your ESC/motor/Main batt. solder joints.

Did you solder these joints personally?
Logo 600SXs, 800XX, TDR IIs
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02-21-2016 01:15 PM  4 years ago
JJC1988

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Germantown MD USA

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700
I did them myself . I will be going back threw all of them .

Thanks !
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02-21-2016 02:11 PM  4 years ago
Pistol Pete

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Seffner, FL

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One way bearing?~~Enjoying the hobby one flight at a time~~
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02-21-2016 03:30 PM  4 years ago
JJC1988

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Germantown MD USA

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700
One way seems to be fine.
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02-22-2016 04:16 AM  4 years ago
pctomlin

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Texas

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From the graph I would look hard at the one way. 2400 rpm on a 700?
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02-25-2016 04:36 PM  4 years ago
JJC1988

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Germantown MD USA

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02-26-2016 03:37 AM  4 years ago
rcflyerheli

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Granbury, TX USA

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Not sure about the video, because it sure sounded like it was making good power with no load. I am in agreement about the one way, as I have had two or three of them start slipping, and in each case my initial thought was that the motor had quit.Logo 700, Specter 700, Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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02-26-2016 03:44 AM  4 years ago
JJC1988

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Germantown MD USA

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700
I'm going to redo all my esc settings . In gov mode with blades on. The helicopter would not come off the ground . It would build up like almost 30% power and just stay there . I did a test in fixed endpoint's mode today and set a normal throttle curve and it came off the ground . I'm starting to think the problem is in gov mode .

Watch at YouTube

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02-26-2016 05:35 AM  4 years ago
rcflyerheli

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Granbury, TX USA

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OK first thing, have you done the end point calibration? That's the first that need doing. You can go ahead and set gov-set rpm to do it. Just make sure you have 0 for your N low point and 100 for the high point. Castle has a link to what I am saying here. For this first part just set 0-30-30-30-100 for your normal throttle curve.

When you first start the set rpm part, the software will pop up and want the motor specifics, battery specifics, and your gearing or main gear/pinion values. Once you input them you can now fill in the requested rpm blocks. The first block will be 30 straight line, IU 1 will be 70 across, and iu2 will be 100 across.

Now go into your menu screen on your TX and go to servo settings/travel and set both the upper and lower endpoints to 50. Move the throttle stick to the high position and turn on the RX and let it initialize. Once that's done, move the throttle stick to the top and then plug in your ESC. You will get some, but not all of the initialization tones. Once you get what you get, start slowly increasing the upper travel limit out towards 100. At some point you should get an additional arming tone. As I recall, I got mine about 97. Once you get the additional tone, increase the value by 2 points.

Now bring the throttle stick down to the bottom, and you may or may not get some more tones. If you get some, wait till they are finished, and now start moving the lower travel limit out towards 100 until you get the final tones, Go two more points and you should be done.

Without blades on your heli, now bring up the throttle stick slightly and the motor should start. N (at 30 percent on throttle curve should give you your first requested rpm, IU1 at 70 should give you your second one, and IU2 at 100 should give your the last requested one. You will have to play with your motor ramps and gains, but that should get you going.
Logo 700, Specter 700, Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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02-27-2016 03:23 AM  4 years ago
JJC1988

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Germantown MD USA

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700
Today I went threw all my settings .Did my endpoints went to the field to test . The helicopter went threw all headspeeds and sounded good . I did a pitch pump and the heli went in to a soft cutoff. Landed went back up did the same thing . Landed the helicopter , didn't want to come off the ground again .... I then grabbed a extra one way bearing from a friend . Just got back from a test and the helicopter still isn't making any power besides a hover and if I pitch pump the tail wants to blow out due to loss off headspeed. If I take the blades off and power up the motor screams like its making amazing power.
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02-27-2016 03:46 AM  4 years ago
Heli Fanatix

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Fountain Valley, CA

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In the first post .. you mention you had used Fixed Point after you got the CC 160HV back and it didn't work. Have you done something that would of let the Fix Endpoint work now?

I assume it's a new and working ESC you got back, so the problem should of been solved. Unless they are sending out refurbished units that are not functioning.

The culprit is the CC 160HV ESC itself if
- motor is good
- battery is good
- connections are good
- OWB is good

I had a few CC ESC's
- smoked a few motors
- cause the tail to kick/blow out
- not spooling up
- GOV going to cut-off going from a simple upright to inverted

Even if your V Bar External Gov settings are off, once ESC detects Low Position and Arms, you should be able to lift off.If the GOV on the CC 160HV ESC can not spool up the motor while under load, ESC is done.

Guess you are lucky ESC is not letting you take off than starts to not cooperate inflight.

Try borrowing any known good ESC, it should solve the problem. The ESC is the starting point that makes everything spins.
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02-27-2016 04:03 AM  4 years ago
JJC1988

rrApprentice

Germantown MD USA

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700
Do you think I could get away with using a castle 120 phoenix edge even though it is a 850mx just to test ? That's the only other esc I have available ?
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02-27-2016 04:57 PM  4 years ago
Heli Fanatix

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Fountain Valley, CA

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Sure you can use a CC 120HV just for trouble shooting purposes.
- Take it easy
- do some fast forward flight and big air
- do some pitch pumps but not as aggressive since its a 120HV.

Good news is if 120HV doesn't shut down, it's definitely the 160HV ESC
Bad news is since its 120HV, most likely will shut down with 850 motor

Won't know till you try. They key is using a maneuver that pushes the ESC hard enough that the 160HV won't currently do while keeping the amperage load under 150A threshold.

- just stay away from any inverted punch out's with full collective and you should be OK. LOL
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02-27-2016 07:19 PM  4 years ago
JJC1988

rrApprentice

Germantown MD USA

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700
So I went ahead and threw in my Castle 120 and the helicopter flew like brand new ! Looks like the Castle 160 that was bad . Thank you everyone for all the help and suggestions. Back to flying soon !

Thanks John
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02-27-2016 10:44 PM  4 years ago
Heli Fanatix

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Fountain Valley, CA

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It's good to see an OP follow up and let know how everything goes. So this will be the gift that keeps on giving.
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02-22-2017 12:44 AM  3 years ago
JJC1988

rrApprentice

Germantown MD USA

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Same problem again
I'm going threw the same problem again .
Link to the new thread !

https://rc.runryder.com/t816426p1/
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