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T-REX 250 › Trex 250 setup
09-03-2009 01:23 PM  8 years agoPost 1
cadwarrior

rrVeteran

Canada

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hi,

I got couple of questions about the setup:

1-What are the best Pitch/Throttle curve (normal, idle up) for the Trex 250?,

2-Wich pinion gear to use 15T or 16T??

3-Can't find into the instruction manual the dimension for installing the ball link onto the rudder (tail) servo horn (dimension from the center of the servo horn to the ball link.

Thanks!

Vincent

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09-04-2009 02:57 PM  8 years agoPost 2
helidevil

rrElite Veteran

Brunswick, ME

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the stuf i use are as follows:

Pitch curves, l-r
normal: 40-100%
stunt 1: 15-50-85%
stunt 2: 10-50-90%
hold: 0-100%

thro curves:
nor: 0-100%
st1: 100-85-100%
st2: 100% flat
hld: 0%-flat

if u want anything else, just lmk

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09-04-2009 05:16 PM  8 years agoPost 3
dkshema

rrMaster

Cedar Rapids, IA

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16 tooth pinion.

I started my tail servo pickoff at 5mm out, ended up running very low gain on a GY401, and poor tail ressponse.

I ended up moving the ball to about 3 mm out from center. This let me crank up the gain, and the tail behaves very well now.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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09-04-2009 07:36 PM  8 years agoPost 4
rocco.sj

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California,

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You dont really need alot of pitch for the T250.what matters is the deflection of the blades.i have mine set up to 11+/11- on pitch curve and 8/8 on elevator/alierons. throttle curve may vary,but if you keep it simple like idle 1,100-85-100,idle 2,100-90-100.some flyers have it on flat curve idle 1,85-85-85, idle 2,95-95-95. and i have my pinion at 16t,i hope they come out with 17t.also im running the futaba 520 gyro and its awesome!!.

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09-05-2009 03:48 AM  8 years agoPost 5
helidevil

rrElite Veteran

Brunswick, ME

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well yea, you could run the 520 with 10% gain and run it better then the align gyro!

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09-05-2009 05:25 AM  8 years agoPost 6
504Rone

rrKey Veteran

New Orleans, LA.

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The gp750 works great for me on both my trex 450 sport and 500.

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09-05-2009 03:35 PM  8 years agoPost 7
cadwarrior

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Canada

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Are you running your GP750 in normal mode or in Heading lock mode??,

I always run my helis in normal mode, what is the difference in flight with heading lock??? i don't do 3D, only loop, rool and inverted hoover sometimes.

for the ones that using gp750, the 5mm from center of the rudder servo is OK for ball link installation??

thanks!

Vincent

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09-05-2009 11:37 PM  8 years agoPost 8
gmcullan

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Southbridge, MA

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Vincent, I hope you initilize your gyro in Heading Hold mode. If you don't, it won't work as well as it should in Rate (normal) mode. You also want to make sure that you mechanically trim the tail to stay in position in Rate Mode. You should not try to compensate with trim or sub trim.

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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09-06-2009 04:42 AM  8 years agoPost 9
rocco.sj

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California,

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cadwarrior

heading lock mode in your gyro is like power steering in your car.unless you drive non-power steering ,then maybe rate mode is okay for you.LOL.i know some very good pilots out there that still fly in rate mode,so whatever is your preffences,thats okay.just remember to set up rate mode carefully otherwise your really going to do the kaos move!.LOL

JR Americas
Evo Power Battery
Radio Frequency RC

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09-06-2009 06:38 PM  8 years agoPost 10
cadwarrior

rrVeteran

Canada

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Vincent, I hope you initilize your gyro in Heading Hold mode. If you don't, it won't work as well as it should in Rate (normal) mode. You also want to make sure that you mechanically trim the tail to stay in position in Rate Mode. You should not try to compensate with trim or sub trim.
I got a futaba 7c, and I always turn on my gyro in normal mode, so my gy401 light always flash. Like you said, I supposed to turn on my gyro in AVCS mode like in the instructions!!, I just changed the setting into my tx to have AVCS turn on on a switch.

So I just realized that I never operate my Gyro the way it should be!!,but my machine still fly great and I don't feel any problem.

I looked up into my TX instructions into the Heli/Gyro section P.72 and there is an example: normal flight mode, and idle up1 you should be in AVCS, then idle up 2 into normal gyro mode???

Should AVCS is easier to fly?? When peoples do 3D, are they in AVCS or Normal??

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09-06-2009 06:59 PM  8 years agoPost 11
Bonez

rrApprentice

Cabot, Arkansas

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i fly in AVCS,no 3d, but from the guys i know that do 3D, they dont come out of AVCS..

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09-06-2009 07:18 PM  8 years agoPost 12
dkshema

rrMaster

Cedar Rapids, IA

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Very few people fly in Normal/Rate mode. Perhaps some scale heli flyers do, and some people like you who just never tried it, do.

In many cases, the only time anyone uses normal/rate mode, is to set up the tail linkage on a new heli, or after a repair, to get the heli to hover without yawing at a hover. Then, it's back to HH mode.

In any event, the 401 needs to be initialized in HH/AVCS mode for it to work properly.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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09-07-2009 02:12 AM  8 years agoPost 13
cadwarrior

rrVeteran

Canada

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I just tried this afternoon for the first time the AVCS side of my 401. WOW much difference in flight!!!, the heli stay straight even with cross wind!, much easier to make loop and inverted hoover! I don't have to fight anymore to keep the heli straight in line in circuits! thanks for your help!

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T-REX 250 › Trex 250 setup
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