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T-REX 550 › Lost of Headspeed during 3D flight
02-03-2013 02:13 AM  5 years agoPost 1
viperviper

rrApprentice

Australia

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i was flying my 550E this morning, flying at 2400rpm idle 2 with CC ICE 75 gov function, after doing a flip nose and back, the heli headspeed suddenly droop and i can hear that the headspeed was gradually increased back to the high idle speed. what could have cause this? there are instant when it doesn't happen, 3 out of the 6 flips exhibited this problem.

i'm using the Mikado mini vbar with CC ICE doing the governing of the headspeed, i hv Flat throttle curve throughout for the idle 1(2200rpm) and 2 (2400).

Second question: how do i increase the piro rate for the tail? ie while hovering, i want the rate of turn on tail to be increased. is this related to gyro gain? i had it set at 72% in the vbar.

third question: what is the headspeed that u guys have set for trex 550E? is 2400rpm enough? and the corresponding flight time?

Really hope u guys can kindly advise. many tks!!

Happy Flying and many safe landings!

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02-03-2013 11:41 AM  5 years agoPost 2
ZS-JAF

rrVeteran

Nazareth, PA

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1. I have a ICE 100 on the 550E and that can get hot during aggressive flights. I don't know what the problem is, but if you download the log, you can email to Castle and they can tell you what they see. Make sure you get to the bottom of it, I had one shut down completely on me.
2. The piro rate can be changed by increasing yaw rate. This is assuming you have the 5. something pro software, I don't know if the standard is different.
3. I think 2400 is a very good HS for the V2. I am running 2250 and I like that since I have the stock head. I get 5 min on 6S 5000.

I have a 3D heli, I don't understand why it doesn't do 3D

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02-05-2013 12:38 PM  5 years agoPost 3
viperviper

rrApprentice

Australia

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thanks mate.

the last 2 flights' log were not recorded as i hv just found out that the memory was full. Will do it the next flight. btw, is 75a esc enough for 550blade at 2400rpm... will i burnt the esc?

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02-12-2013 04:48 AM  5 years agoPost 4
viperviper

rrApprentice

Australia

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flew today, 2 packs for the 2 flights.

first flight, pack #1: the same symptom appeared. Headspeed sudden drooped when doing flips and can hear the spooling up of the HeadSpeed went back on...

2nd flight, pack #2 was good! normal and gentle 3D flight. only till end of flight time(4mins) there is a sudden dropped (approx:1 sec)in headspeed but landed the heli uneventfully.

measured my pack #1 : 6S lipo battery: the internal resistance (IR) of were 12,11,4,14,4 and 2 milliOhm.

2nd pack: the internal resistance is 4,5,5,5,3 and 3 milliohm..

Will the high IR of pack #1 cause this problem that i hv described?

And when measuring IR with the charger, do i need to at the same time charging the battery? or just plug in the battery into the ports without intiatiing the charging process?

Pls advise. many tks!!!

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02-12-2013 04:19 PM  5 years agoPost 5
Dr.Don

rrVeteran

Cedar Park, TX -- USA

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You really need to look at the data logs. With those batteries you may be experiencing low voltage cutoff in the esc. Look and see how you have the cutoffs set up. You can test it by setting an arbitrarily low voltage cutoff that you know the battery cannot reach and then fly it and see if the problem goes away. If so, it is probably your battery. Don't forget to reset the voltage cutoff to a more normal value after your test is finished.

Dr.Don

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02-12-2013 08:47 PM  5 years agoPost 6
Waco

rrApprentice

Bernalillo, New Mexico USA

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Might look for marginal mechanical connections in the wiring. Sometimes basics get over looked and they should always be a troubleshooting starting point. Waco

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02-13-2013 09:44 AM  5 years agoPost 7
viperviper

rrApprentice

Australia

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ok. so far i hv downloaded the CC log, saw the 6S voltages dropped to 17V! and 18V in few occasions and the corresponding headspeed also dropped....Looks like it's battery fault.

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02-23-2013 03:51 AM  5 years agoPost 8
Solmanbandit

rrElite Veteran

Tucson , AZ

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75A for a 550 is definitely too small. The 550 should have at least 90A esc. Also if you are flying it hard, set the esc to insensitive. What size batteries are you using?

Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2

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02-23-2013 05:01 AM  5 years agoPost 9
viperviper

rrApprentice

Australia

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Thanks for the advice. i'm using 6S 5000mah. yes, i hv set it to insensitive.

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02-23-2013 05:28 AM  5 years agoPost 10
Solmanbandit

rrElite Veteran

Tucson , AZ

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To give you an idea, I am using a 75A castle on my 500 and a 100A on my 600. If you check your logs, it will tell you how many amps you are pulling. Also unless you are using the Talon 90, use a separate BEC.

Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2

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02-23-2013 06:29 AM  5 years agoPost 11
viperviper

rrApprentice

Australia

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My logs show spike of over 160A, transient spike
. . I'm using the Hercules bec
..

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02-23-2013 02:20 PM  5 years agoPost 12
pistol974

rrApprentice

Columbus, Ohio

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Could be the cc governer too? I fly a E7 with cc 120 in gov mode. sometimes when the head unloads you can hear the motor spool down and pick back up. The gov on cc isnt the best and i believe that is a common thing with them.?.
I do agree a 75amp esc is too small. On my 550 i ran a 100 and still got 120-140 spikes.

http://www.corflyers.com/

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02-23-2013 02:45 PM  5 years agoPost 13
Solmanbandit

rrElite Veteran

Tucson , AZ

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Yea, you are more than doubling your amps. I believe even insenstive only goes up to 130A. I believe that is the problem for your cut outs. You are over amping the ESC. I have came across this problem before and did the same thing. Since you already have a good BEC, I would switch it up to the 100A ESC.

Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2

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02-24-2013 05:06 AM  5 years agoPost 14
Scott1115

rrElite Veteran

Greenwich, CT

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Several things come to mind. You absolutely need a 90+ amp ESC. Based on your ESC and your pinion, you may not have enough headroom for the ESC to spool up to, to maintain the 2400 HS you desire. Lastly, your battery might be damaged or have a fraying wire causing resistance and lowering the flow of electrons under load.

Let us know what you find.

Compass 7HV, Trex 550E
RCRCC

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02-24-2013 05:20 AM  5 years agoPost 15
viperviper

rrApprentice

Australia

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i suspected my battery since i hv posted the internal resistance values in one of the above replies. Could it be the problem then rather the ESC? i hv new battery on order now and will test it out when arrive.

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02-24-2013 05:27 AM  5 years agoPost 16
Scott1115

rrElite Veteran

Greenwich, CT

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Fly both batteries and see if it only occurs with one battery. I still think you need a bigger ESC. I suspect it's the combination of a "bad" battery and a weak ESC.

Compass 7HV, Trex 550E
RCRCC

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04-23-2013 11:31 PM  5 years agoPost 17
Craig.C

rrNovice

Overland Park, KS

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Voltage cutoff might be to low.

I have to set mine on 3.0 so a power spike won't cause cutoff.

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