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HomeAircraftHelicopterMain Discussion › loosing head speed?
03-11-2010 09:36 PM  8 years agoPost 1
bhoff

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houston texas

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for some reason when i fly lately i will be in a hover and all of sudden the head speed dramastically decreases...i have no idea why, so ill land it, get it goin again and its back to normal, or even sometimes ill jump the throttle stick and it will go back to normal...this has been happening ever since i changed my 12t pinion to a 14t

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03-11-2010 09:45 PM  8 years agoPost 2
bhoff

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houston texas

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this is on my trex 450 sport

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03-11-2010 10:15 PM  8 years agoPost 3
Flying Brian

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St. Clairsville, Ohio

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Sounds like your esc is getting ready to puke.

"I just don't Listen" "

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03-11-2010 10:34 PM  8 years agoPost 4
700E

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Mississippi

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Or, since you went up in HS your setup can not handle it. Maybe's it's your lipos? They were working fine on a 12t, but with a 14t they can't keep up. Maybe they are shot?

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03-11-2010 10:40 PM  8 years agoPost 5
jones007

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Monterey, CA - USA

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What ESC is this? Some have a soft cutoff if the voltage drops too low, which will result in a dramatic decrease in headspeed shortly after it's tripped. The soft cutoff is reset when the stick is brought to an idle, and the high headspeed will return until the voltage drops low again. I never use the Align ESCs, so I don't know if they have a soft or hard cutoff. The remedy is either less power to the motor (smaller pinion) or better batteries.

--Kevin

Trex 700N, Trex 600ESP, Trex 500, Trex 450Pro

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03-11-2010 10:57 PM  8 years agoPost 6
Ronald Thomas

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Gainesville, Fl, USA

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Can you post your complete setup?

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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03-12-2010 06:15 PM  8 years agoPost 7
bhoff

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houston texas

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i have the align sport super combo kit...so its an align esc...i really think it is my lipos because theyre not that great, only 20c 2200mah and there not the best brand

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03-12-2010 06:19 PM  8 years agoPost 8
bhoff

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houston texas

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also because my lipos used to last about 6 minutes in flight time with the 12t. now there only lasting about 3.5, and usually i get that random loss of head speed around 3 minutes of hovering..but then the head speed will boos back up, but not for very long

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03-12-2010 06:30 PM  8 years agoPost 9
bhoff

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houston texas

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also my lipos used to never get hot aftr flight and now they r ver very hot, im gonna buy thunder power 45c

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03-12-2010 06:38 PM  8 years agoPost 10
jbiter

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Sebring, FL

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Any possibility your one way bearing is slipping? When your headspeed decreases, does the motor also seem to run slower?

Jeff

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03-12-2010 06:39 PM  8 years agoPost 11
bhoff

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houston texas

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im not sure..ill go hover it and see how it goes

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03-12-2010 08:42 PM  8 years agoPost 12
Andy.Kim

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Seattle, WA

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On a hot electric setup you will look at 3.5 min flight times. Having better batteries won't increase your flight time unless u step the pinion down

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03-12-2010 08:43 PM  8 years agoPost 13
jones007

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Monterey, CA - USA

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Actually, with your comments on the battery state, I suspect it is your batteries, and a low voltage cutoff in the ESC.

Trex 700N, Trex 600ESP, Trex 500, Trex 450Pro

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03-12-2010 08:58 PM  8 years agoPost 14
Terrabit

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Seattle, WA - USA

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Sounds to me like your lipos are toast. Just the same, what is your throttle curve and headspeed?

Can you test with a lipo of known good condition?

PS: Six minutes is too long for a t450 doing anything but hovering in my experience. You may have damaged these lipos. Do you know how much mAh you're putting back into them?

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03-13-2010 12:05 AM  8 years agoPost 15
Yug

rrMaster

UK. Herts

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sounds like you're using 3S with the result that currents will be high and everything will get too hot. 4S is a better option all round.

Vegetable rights and Peace

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03-14-2010 08:28 AM  8 years agoPost 16
bhoff

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houston texas

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u think a 4s on my 450? no the lipos are not damaged..never crashed this heli..but ya i was talking about 6 minutes in hover, i set my timer to 4 min. at the field..so should i just drop to maybe a 13t or go back to my 12t pinion? i think if i get the 45c pretty sure its 2300mah, i wont have this problem but im not sure, i might just go to a 4c..how many MAH can i go in the 450? like whats the highest mah i can put in the 450?

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03-14-2010 08:30 AM  8 years agoPost 17
bhoff

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houston texas

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also is there a way to fix the low cutoff on my esc? i have the esc that came with the super combo kit

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03-14-2010 09:29 AM  8 years agoPost 18
XxCaTMaNxX

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Navarre, FL - U.S.A.

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Firstly your tx must be setup such that your throttle curve is the default linear curve. ie. 0 25 50 75 100 for a radio with a five point curve. The reason for this is that the ESC uses the stick position to sense what settings you want during the programming phase.

Next step is to put your stick at full throttle and plug in the battery (yes, I was also worried).

The ESC will emit a scale (crecendo) of notes in quick succession indicating setup mode being entered.
Put the stick at low throttle and the setup sequence begins.

The ESC will now emit a single beep, repeating slowly, this indicates option 1 is being set. Put the stick in the appropriate place for the setting you want. Option 1 is the break setting, so should be turned off in a heli, so the stick should be at low throttle. The ESC will wait a preset period of time beeping once slowly and then take the option as wherever the stick currently is placed. If you are following these instructions then you won't have moved the stick from the low throttle position at the start of the setup sequence.

The ESC now emits a scale of notes in quick succession to indicate the setting has been taken and will now beep twice, slowly and repeating. You are now setting option 2, hence the two beeps slowly repeating. You are now setting the timing for the motor. Place the stick in the appropriate place for your motor. Option 1 is low timing, option 2 is mid timing and option 3 is high timing. For an Align motor mid or low timing can be used, so middle or low throttle for the stick.
After a preset period the ESC will emit a scale of notes in quick succession, indicating the option has been set.

Following this the ESC will emit three beeps, repeating slowly, you are now setting option 3 for battery protection.
Again place the stick high, middle or low. I set my battery protection to high (70%) which is the low throttle stick position. This gives you just under 9v as the point your ESC will enter battery protection mode.

After a preset period you get the scale of notes in quick succession and then the ESC plays back your settings using beep codes for option 1, 2 and 3. Listen carefully to verify they are correct.

If they are then unplug the battery, plug it back in and go fly. If they aren't correct unplug the battery, place your stick at full throttle and plug the battery back in again to re-enter setup mode.

I told the doctor I broke my leg in two places. He told me to quit going to those places...

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03-14-2010 06:40 PM  8 years agoPost 19
outhouse

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auburn ca

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you know yourself your lipos are not up to it.

every time you let it run down in headspeed your damaging them more to.

get some 30C's and time the flights leaving %25 left in and youll have a screamer

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