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Home✈️Aircraft🚁Helicoptere-AlignT-REX 450 › T-Rex 450 flight times
08-02-2007 09:18 PM  13 years ago
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fergus

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Ireland

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T-Rex 450 flight times
Just finished a 450s build for a friend and did a test flight. I thought the flight times should be better but I have little experience with this model!

I flew for four minutes and measured the amount put back into the battery as: 1293mAh (includes balancing so this maybe slightly lower)

The battery is a 3s Flighpower Evo 20 2170mAh pack. So applying the 80% rule that gives a usable capacity of 1736mAh.

Unless my maths are wrong that means a 5min30sec flight is the safest limit. I would have expected closer to seven minutes (just hovering, slow climbs and turns). Have I something wrong?

Gear mesh and belt tension are fine. Battery was 115 deg F, With motor (Align 430L) and speed controller slightly hotter.

(12 tooth pinion on the motor with governor mode enabled at 95%)

Any feedback is appreciated,

Fergus
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08-02-2007 09:55 PM  13 years ago
Awais

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Mississauga, Ontario - Canada

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430L with 12T. You should easily be able to do 7 mins. Check to see if the gear mesh is not too tight, and the belt tension.

With 430L, 13T and 2100 packs I get about 7 mins sport flying and put back about 80% in the pack.

Awais
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08-03-2007 12:27 AM  13 years ago
dct

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San Angelo TX.

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First,, if you want longer flight times,stop using governor mode!
It always takes more power then you need!
Go to a throttle curve of about 82 to 100 in idle 1 .
Then setup idle two for about 90 to 100 in it.
You should be able to get 8 minutes!
I do with some easy 3D.
I only use idle 2 when going for loops ,flips and aileron rolls.
I then go back to idle 1 for just flying around.And I still am good for the 80% rule.
I use the same motor 430l 3550kv and 12T pinion also.
**Now doing Forward Flight And EASY 3d! And having a Ball !!**
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08-03-2007 02:09 AM  13 years ago
airboss

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OC ,california

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safest bet is to fly 5m and as you progress you wont worry about killing your lipos.dont go to far and they will last for many flights.Urukay HPS3 KSE 700 HPS3
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08-03-2007 04:49 AM  13 years ago
turboomni

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East of the Equator

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Try a 11T pinion
I ran the 12 T with the 430L motor+ Align 35 esc in non gov mode.
I tried th 11 T and the motor and Lipo's liked it better. All were cooler . I run in a throttle curve in stunt mode 1 of 100 80 78 80 100. The motor has more torque over the mains with the 11T and maintains headspeed abit better than the 12T because of the gear ratio and because it's in it's power rpm range. No it's not blindingly high head speed but it works for me and is very plesant to fly. 7 to 8 minutes flights are the rule. My timer is set at 7 and 1/2 minutes of some rather hard hauling on the sticks. I would like more power than the 430L can offer with any pinion, but I rather have some longer flight times and save Lipo's than get say a 430XL.
Try an 11T ,,can't hurt and cost's nothing really to try.
Setup is everything, All my heli's can fly far better than I can pilot them
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08-03-2007 06:04 AM  13 years ago
fergus

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Ireland

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Something is not right. The mesh and belt tension are fine. Links are smooth as well. I did notice the tracking was off on a blade. As I said its a new build so I will adjust that. Needs a half turn on the blade grip link and they only allow for a full turn . Will have to do some adjustment on the mixer arms to compensate.

Could the governor mode really take two minutes off a flight?

If I set up a throttle curve for this guy instead of governor mode what figures should I be looking at for a pitch range of zero to nine? (I know it will require some adjustment but as a guide?). No 3d for a while yet he is only starting out.

I forgot to mention the training undercarriage cross pieces and balls are bellow the skids as well could this be the cause? (its not much extra weight and drag is not an issue as I was only hovering).

There was only a 12 and 13 tooth pinion in the kit and its mail order from the UK so I wont pay the shipping for a single 11 tooth pinion it will have to wait until I am placing a bigger order. (maybe if it was my kit)

Regards

Fergus
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08-03-2007 07:53 AM  13 years ago
Yoshihiro

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Singapore

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hi dude, i got 450S same as you, my flight time was ard 7min for flying around 5min for 3D, i use 12T li-po is airthunder, so far not an issuse run great for me, alwise remember don use the gov mode, throttle curve i using normal mode as in the normally people use, idle 1 100,85,80,85,100 idle 2 100,100,100,100,100. The motor does run abit hot but it still ok to touch like warmming up to hot..I fly, then I crash, I fix, then I fly, then I crash, I fix, then the wife ask me to leave....
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08-03-2007 03:18 PM  13 years ago
CHEVPRO

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Mississauga,Ontario

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flight times
Everbody at our field runs 100% in idle up. This seems to be the most effecient spot for the motor, if the gearing and meshes are correct. And it sounds so sweet!
I average about 6mins a flight and put in about 1400mah back, keep in mind I'm also running an Aon 3500kv.

Todd
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08-03-2007 03:50 PM  13 years ago
dct

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San Angelo TX.

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I for one disagree about using 100 across the board!
Why??? you don't need all the speed or power most of the time!!!
And your motor will bog! Why, it has no place to go at 100%
Next,, YES governor will take a lot more power out of your battery and so will hovering! One more time,, hovering is hard on batteries!
It takes almost as much power as some 3D does!
And yes training gear is going to take more out of your battery.
Also,, if your using new batteries,,,,???? You need to brake them in slowly or easy! Or you are killing them!And this will give you less flight time also.
Next down load Finless setup video on Trex..
It's not on this forum you have to go to another web site for them now.
It will answer all your questiong about everything...!!!!
I don't think I can post the web site here, so just drop me a e-mail and I will give you a link to it.
I didn't post throttle curves because I don't know what radio you are running? My TX uses a 5 point throttle curve setup. Some use only 3 points.
If you trying for longer flight times? STAY AWAY FROM governor !
**Now doing Forward Flight And EASY 3d! And having a Ball !!**
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08-03-2007 05:23 PM  13 years ago
MIKe27

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Florida,US

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STAY AWAY FROM governor !
What ESC do you use? if is the CC35 what are your setting?? i have a JGF450th with the C35 at 4s.. any advice??

Thanks
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08-03-2007 05:37 PM  13 years ago
turboomni

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East of the Equator

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With the throttle curve at 100% all the way across you can get away with not using good collective management at the expense of running time.
If you are only basically hovering I would try an 11T pinion.
Setup is everything, All my heli's can fly far better than I can pilot them
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08-03-2007 06:32 PM  13 years ago
martinhoyle

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Birmingham UK

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Turboomni

I agree with you, I get 8 mins or nearly 10 if I am just messing about in my garden out of the EVO 20 2170 3s

450S standard with C/F U/C, boom, fins and Fun-Key Blades

Martin
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08-03-2007 06:40 PM  13 years ago
fergus

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Ireland

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Martin is that with the 11 tooth pinion?
What motor and speed controller?

It is a new battery so maybe after a few flights things will improve. Remember my flight time of 5min 30 sec is only arrived at from maths. I only flew for 4 minutes to bed her in and check the expo and tracking after the build. I used the ammount put back in by the charger to arrive at the figure quoted as a safe flight time.

I dont think its an issue with the belt or gear mesh. If it was I think the battery would have been alot hotter than 115 deg F

Fergus
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08-03-2007 07:01 PM  13 years ago
cbflys

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Nesconset, NY - USA

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I have the 450SA with the JGF 450TH. Did a little experimenting with pinions and runtimes. I'm using ThunderPower eXtreme 2070 packs and the Castle Creations Pheonix 35A ESC.

The best pinion I found for overall flying is the 12 tooth. I get around 10 minutes of flight time and still don't use 80% of the pack. With the 13 tooth pinion I get around 8 minutes or so.
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08-03-2007 07:06 PM  13 years ago
martinhoyle

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Birmingham UK

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Fergus

12T BL430L 3550KV BL35X 35A ESC
This is on a new pack - general flying

If you just hover around the tail wag power surge low volt warning comes at around 10 mins (this is about 80% power on my Fun-Key blades which are only 303mm so I have a higher head speed)

Martin

My Ultramat 14 graupner charger reports a full charge after 76 mins 42S at 2100 mAH
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08-03-2007 07:18 PM  13 years ago
nivlek

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Norfolk England

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I use around 1700mA in 6 mins 30 on my TRex 450 SE using the 13 tooth pinion . I don't use the governor ,in idle up2 , I have a curve using 90% at zero pitch 100% at full positive/negative and a H/S of 2950 .At the end of the day , it gets dark .
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08-03-2007 08:55 PM  13 years ago
Jr.fling-winger

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Calgary - Canada

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I found a couple of times, when my flight times were less than expected and my gear mesh and belt tension were OK - check and see how freely your swashplate moves/tilts WITHOUT the servos connected to the swashplate. I found the screw that attaches the plastic washout arms sometimes becomes too tight, which then draws alot more from your batt to move/control your swashplate.

I regained about 1 min of flight time after loosening these links.

Mark
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08-03-2007 09:02 PM  13 years ago
turboomni

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East of the Equator

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I liked the 12T alot and agree overall it's the best comprimise. When I went to the 11T it took alittle getting used to but was easier on my lipo's and batteries with the heat of summer and all. Now I'm used to it and it's fine. This Fall I may go back to a 12T when it's cooler.
I do wish as I said ealier that I had more power for tick tocks and such but the stuff I need to work on doesn't require tons power at all,,just brains,,LOL! So I'll take the run time.
Setup is everything, All my heli's can fly far better than I can pilot them
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08-03-2007 09:08 PM  13 years ago
cbflys

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Nesconset, NY - USA

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Best way to 'up' the power without sacrificing run time is to 'up' the voltage. Go 4S.
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08-03-2007 11:34 PM  13 years ago
fergus

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Ireland

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The weather is gone to hell here so it could be a few days before I fly it for him again. I will take it out of governor mode and set a throttle curve of about 80 to 95 from zero to nine degrees and see if that makes it better. I have no negative pitch on collective for him yet in case he slams it into the ground while learning to hover.

When I disable governor will that also disable soft start? Should I set up an identical pitch curve to that above but with a gentle throttle curve from low to half stick which he can then switch out of as the headspeed comes up?

Thanks for all your input guys

Fergus
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