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Home✈️Aircraft🚁Helicoptere-AlignT-REX 450 › T-Rex 450 flight times
08-04-2007 12:05 AM  13 years ago
Awais

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Mississauga, Ontario - Canada

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80 seems a little bit low. Try a lower teeth pinion if you want a lower headspeed and change the curve to something like 100-95-90-95-100.

Awais
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08-04-2007 12:56 AM  13 years ago
fergus

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Ireland

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I take it you mean 90 is at zero pitch so it would be 90-92.5-95-97.5-100 for a straight pitch curve of zero to nine degrees. I am not putting a 'V' curve on this heli until he can fly it comfortably right way up!

Any thoughts on soft start, will the curve above cause it to go straight to 90% throttle and maybe fold back a blade when spooling up?

Thanks for the help

Fergus
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08-04-2007 10:02 AM  13 years ago
nivlek

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Norfolk England

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I don't know which esc you're using , but on my Align esc , the soft start is independant of governor mode . I suspect that this is true of all esc's . However , although I use 90% at zero pitch on my "V" curve , in normal mode you need to start at 0% throttle , other wise you'd have to be in Throttle Hold at start up and suddenly switch into 90% throttle , and back into Throttle Hold to stop . That just doesn't sound nice . However , your curve can start from zero throttle and sharply rise to 90/100% .At the end of the day , it gets dark .
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08-04-2007 03:26 PM  13 years ago
dct

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San Angelo TX.

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fergus
All the answers to all your questions are in those videos I sent you a link too.
I have used those videos for over 500 flights now and changed my pitch and throttle curves very little.( Better for me.)I know it will take some time to down load them,,, but they IMO are the best around....!!!!!!
**Now doing Forward Flight And EASY 3d! And having a Ball !!**
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08-04-2007 05:18 PM  13 years ago
bilbo

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Boston, MA - USA

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Any thoughts on soft start, will the curve above cause it to go straight to 90% throttle and maybe fold back a blade when spooling up?
There is no problem with doing this if you have soft start enabled. That's the point of soft start. I always start with the transmitter in idle-1 and throttle-hold on, and then switch off throttle hold, and then switch throttle hold back on at the end of the flight. I've been doing this with the Align 35X ESC and a Jazz 40-6-18 ESC, and the soft start on both is easily soft enough to cause no stress on the heli. In fact if anything the soft start spools up slower than I'd probably do manually. The reason I always start in idle-1 is because I know myself well enough to know that otherwise I'd eventually forget to switch to idle-1 and do a flip and end up on the ground.

As for the claim that governor mode shortens your flight times, that depends on the ESC. I found with my Align ESC that governor mode did shorten my flight time a little, but with my Jazz ESC I get just as long flight times in governor mode. There's no reason in principle why governor mode should use more power than a properly setup idle-up throttle curve; after all the aim of both is to hold a constant head speed.
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08-04-2007 06:18 PM  13 years ago
fergus

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Ireland

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Thanks for all the help guys. Dct I have seen the vids you refer too and saved them somewhere I will review them again.

I will try a throttle curve with soft start enabled instead of the governor mode as soon as the wind and rain stops (could be a while in this part of th World) The fact its a brand new battery and the addition of training undercarriage as well as the fact I was just hovering all probablly contributed too the short flight time.

Its the stock Align speed controller by the way. I have velcro stuck over the model number so thats why I couldn't quote it at the start!

Thanks all

Fergus
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08-04-2007 06:57 PM  13 years ago
Helifool

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Rochester New York

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I got over 9 mins on my trex with some mild 3d in my rex. I get 10 mins sport flying The voltage in my pack after flight is over 14.8 My power setup is

Neu 1107/2y on 9 tooth
Jazz 40 ESC
4s 2100 TP prolite

This gives me 3000 RPM headspeed. Its a bit of an expensive setup but but its great. Lots of power and flight time.
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09-01-2007 07:52 AM  13 years ago
whistler71

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Vancouver, BC, Canada

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How low can you safely go on the voltage without damaging or shortening the life of the lipo. I am running up to 15 minutes with 2500 mAh FP EvoLite.I have 10.30V or so left at the end... A few times, it went down to 9.75V or so... I am just hovering around, newbie! Thanks.
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09-01-2007 08:04 AM  13 years ago
Awais

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Mississauga, Ontario - Canada

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You should not be discharging the pack no more than 80% of the total capacity. So 80% of 2500 is 2000. Keep an eye on much you're putting back in when charging the pack. Usually when I'm charging my packs after they're cooled down the voltage is near 11.1v.

You should always break in a new pack. Only fly for about 3-4 mins just hovering and FF discharging about 50%. Do this about 5 times at least.

Awais
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09-01-2007 08:09 AM  13 years ago
whistler71

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Vancouver, BC, Canada

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You should not be discharging the pack no more than 80% of the total capacity. So 80% of 2500 is 2000. Keep an eye on much you're putting back in when charging the pack. Usually when I'm charging my packs after they're cooled down the voltage is near 11.1v.

You should always break in a new pack. Only fly for about 3-4 mins just hovering and FF discharging about 50%. Do this about 5 times at least.

Awais
How do I know what 2000 mAh is? Can my voltmeter measure that?

About the break in, all I have the skills to do right now is hover around! What is FF discharging about 50%? Does it matter that I have not done that for the first 2 times that I used the packs? As I said, I am very GREEN!
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09-01-2007 08:19 AM  13 years ago
Awais

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Mississauga, Ontario - Canada

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Chargers display how much mAh was put in the pack. If your charger doesn't, have a look at the FMA Cellpro charger.

FF is forward flight and FFF is fast forward flight.

First 5 or so cycles, discharge to about 50% of the capacity. You don't have to do it but I've heard its better to do so.

Awais
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09-01-2007 08:27 AM  13 years ago
whistler71

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Vancouver, BC, Canada

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So basically only do 5 mins or less hovering and moving around for the first 5 times; right? My charger does not measure mAh, it is a very basic one...
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09-01-2007 09:25 PM  13 years ago
trex940

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Trenton, Ontario

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I am doing some math here and hope that it is right. I just had a flight today and was up for 10 minutes. I had the timer on my DX7 set at 6 minutes and 30 seconds and was concentrating so hard on the beautiful hover that I had going that I didn't hear the timer go off. It is the TRex 450SE V2 and CellPro 2100mAh pack. When I checked it on my multi meter and CellPro 4S charger, they read 10.64v and cell voltages of 3.54 to 3.64 volts remaining in the individual cells. At 80% of the starting voltage of 4.2v per cell I have 3.36v per cell. I am checking the 80% of the mAh that I put back into the pack as the final say to what I used today, but that gives me 1680mAh that should go back in. The most I was putting back in was 1520mAh into the packs before today. This is less then the 80% mAh. Does this mean that I can extend my flight times and see what I should be getting? I am running the 11T in my bird and no govenor used. I would love to get more stick time on every flight as practice is the key to getting better with every flight. I am still in the hover stages of training with very little forward flight and backwards flight mixed in from time to time, close to the ground of course. Some direction on this would be nice.

Thanks,
Wayne
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09-02-2007 04:14 AM  13 years ago
fulload

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Wichita, Ks.

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I wanted to take a moment and suggest Thunderpower batteries. If you haven't been reading about them, they have been very good for me. I fly my trex 450 until it will not hover well, land and go charge my battery. They are not damaged by low voltage. Mine have been discharged as low as 3.1 per cell several times. I get about 10 minutes flight time on every pack.
The great thing is, you don't have to worry about timers or how much you are taking out of your batteries.
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09-02-2007 05:24 AM  13 years ago
whistler71

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Vancouver, BC, Canada

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I wanted to take a moment and suggest Thunderpower batteries. If you haven't been reading about them, they have been very good for me. I fly my trex 450 until it will not hover well, land and go charge my battery. They are not damaged by low voltage. Mine have been discharged as low as 3.1 per cell several times. I get about 10 minutes flight time on every pack.
The great thing is, you don't have to worry about timers or how much you are taking out of your batteries.
I have also heard good things about these TP batteries, but I will once again highly recommend the Flight Power Evolite 2500 because as I said, I am 110% sure that I was able to get 15+ minutes out of them (easy flying) with 9.76V or more left in them... I will use a stopwatch to see exactly how much flight time, but it is at least 15 minutes.
When does a hobby become an obsession!??
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09-02-2007 02:28 PM  13 years ago
trex940

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Trenton, Ontario

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I charged the low battery and added about 93% to it. I seem to be good as it is holding the charge. I have adjusted my timer to 6:40 and am charging the battery now to see what it is going to take in. I really like the cellpro batteries as they plug directly into their charger and are fairly cheap at about $47 USD. I now have four of their batteries and am charging at 1.00 amp. It takes awhile to charge, but I killed the battery that came with my TRex 450SE V2 by shoving the charge in at 3.75 amps. This won't happen again!! I am trying to learn all I can now about dealing with LiPo's. I have created log form's for each battery now and log every charge now. I am really monitoring the amount added to every pack. I will post the log latter on when I get home as I am at work.

Wayne
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09-02-2007 03:44 PM  13 years ago
MIKe27

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Florida,US

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Hey guys what would be the best way to breaking lipos?? just bouth a couple of 4s.. i saw the new Evolite 3s 2500 and it says that it could be charged at 2C, is it true??
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09-02-2007 04:01 PM  13 years ago
jimboflies

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Beaumont, Texas;

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2C , yes it is true, Evolite 3s 2500mah uses ENERLAND cells made in Korea, these cells are the new "LP" series , 18C (45amp) continious discharge , 5 amp (2C) charge!!
this is ENERLANDS 3s1p 2500mah 18C dis., 2C charge battery, POLY-QUEST http://www.enerland.com/upload/2500LP-3S1.pdf , Poly-Quest are the only batteries that I will use now ...
POLY-QUEST Rocks!!!

Here is all of the specs ...
http://www.enerland.com/upload/2500LP2.pdf
EP8 EX twinring frame
Quick of Japan
EP8v2 EX
EP9
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09-02-2007 04:15 PM  13 years ago
jimboflies

rrElite Veteran

Beaumont, Texas;

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Hey MIKe27 , why would you want to break your lipos?EP8 EX twinring frame
Quick of Japan
EP8v2 EX
EP9
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09-02-2007 04:44 PM  13 years ago
MIKe27

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Florida,US

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LOL! dont you know what Break-in means??
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