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T-REX 450 › First flight and crashed............
02-06-2008 04:18 AM  10 years agoPost 1
Awol_46

rrNovice

Sidney, MT USA

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Well I bought a Trex 450SE on Rc groups, this is my first setup on a heli, so I have been doin a lot of searchin and using te Finless videos. My setup is: Jazz esc, JGF 450th, HS65MG, Hitec HG5000 w/ HSG-5083MG, Radix main. I am using xp7202 for now, but am going to go to 9303 when I get the xtra cash. Now to the problem, I got everything together, everything going in the right direction. I spooled it up, got about 1/4 stick and it really started to climb, scared me so I put throttle back to zero hit ground and broke landing gear. It seemed like my head speed was excessivly fast, I have my throttle curve set on a linear curve, so no sure what I'm doin wrong. Any help would be great, I know this is kinda vague, but maybe I can explain better if yu need more precise info.

AIN'T GRAVITY A *BEEP*

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02-06-2008 04:24 AM  10 years agoPost 2
jeffreydc

rrApprentice

sulphur, La

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So you have never flown a heli? Ever use a flight sim? If not you are in for a world of hurt my friend. You need to at least put some training gear on that thing before you destroy it, you and everyone else.

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02-06-2008 04:24 AM  10 years agoPost 3
cwright

rrKey Veteran

Blossvale New York

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Do you know what negree of pitch your running? If not you will need to get a pitch gauge to check that. I am running in normal mode -6, 0 at half stick and +11 at full throttle. Just a reminder when checking this out unplug the motor. Chuck

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02-06-2008 04:26 AM  10 years agoPost 4
Waco

rrApprentice

Bernalillo, New Mexico USA

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First flight
I don't know what your sperm count has to do with anything...but maybe you need to go to a governing mode on your ESC and keep (head speed) up
at low stick.

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02-06-2008 04:31 AM  10 years agoPost 5
jack726

rrVeteran

Cerritos California

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If your heli started to climb at 1/4 stick, it is not set up properly. Most people set them up so they hover at about 3/4 stick. The old school used to set up for hover at 1/2 stick and 3/4 stick in idle up one. Your normal throttle curve should be something like 0 25 80 90 100 in normal mode and either a flat curve between 80 and 90, according to what you want your headspeed to be. You can also use an idle up curve like 100 80 100.

If you have never seen a Rex spool up, the rotor speed can scare you.

Jack

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02-06-2008 04:39 AM  10 years agoPost 6
Awol_46

rrNovice

Sidney, MT USA

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No I've been flyin for about a year, but I have a cx2 and a cppro so they are already setup. This is my first actual setup from scratch. I had my pitch set at 0deg or -2deg at O stick, will check tommorrow when I get off work to verify that.

AIN'T GRAVITY A *BEEP*

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02-06-2008 04:51 AM  10 years agoPost 7
rcmadness

rrApprentice

Midland, Texas - USA

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Training gear!!!!
I also fly an CX2 like a mad man and a B400 not so good but getting there. I recently purchased a used Trex 450 SE and it is a totally different heli. I have learned the hard way, I always put on training gear for the first few flights. Even if I make a speculative change in the set up the gear goes back on until I know it will fly right. My custom built training gear ($7) has saved me untold amounts of money when testing equipment.

On the Trex alone it save me a ton of money when the esc bit the dust (last used equipment for me) and locked the motor about 10 feet off the ground. Kinda autogyroed into the ground and the gear saved my butt.

For me its not necessarily the money rather that I hate waiting on parts.

Good luck

Trex-250-450se-450pro-500esp-600nitro-Predator Gasser

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02-06-2008 05:43 AM  10 years agoPost 8
c54fun

rrApprentice

Dallas Texas

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" I have my throttle curve set on a linear curve"
Not sure what jazz you have but I run a jazz also and the headspeed is set buy the throttle curve.
Here is my throttle curves: Normal 40 streight ascross =2600rpm.
Idle1 47.5 across =2800rpm. And idle 2 58 across =3000 rpm. Different set ups will very.This is just an example of how mine works!! At mid stick you may have been pretty high.
A couple of things. Center stick(Throttle stick) needs to be 0 pitch. With the jazz start of with your throttle curves around 30 for all points in normal mode and see if you have a managable rpm. The jazz has a great govenor but you should not run a linear curve.The great thing about the jazz is its great govenor. Set it and forget it.

Dont chop that throttle

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02-06-2008 05:45 AM  10 years agoPost 9
jeffreydc

rrApprentice

sulphur, La

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Go to lowes or home depot and get you some long 1/4" dowels. Then go to WalMart and get some of those plastic golf balls with holes. Zip tie em together and attatch to skids and whalla...instant training wheels! A must have if you've never flown "real" heli

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02-06-2008 06:57 AM  10 years agoPost 10
wannabfishin02

rrApprentice

barnhart, Mo-63012

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It sounds like your pitch curve needs some work. Throttle at linear will work for now. You need to start off at mid stick, and get your pitch to 0 degrees (most common setup) From there, go to zero stick, and try to get around -2 to -4 degrees. Then go to full stick, and try to get +10 degrees. This should be a decent starting point for you. From there, check around 3/4 stick and you should be around 5 degrees or real close to. This should keep you from coming off the ground at such a low stick. Also, I would suggest the training wheels as described by others as well till you feel more comfortable with your setup. Good luck and take your time

A bad day of flying is better than a good day of work

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02-06-2008 11:05 AM  10 years agoPost 11
TomRex

rrElite Veteran

West Palm Beach Join Date: 12-28-2005

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better yet, find the finless setup videos

Ignorance is the absence of facts.Stupid is lacking the intellectual capacity to comprehend the fact

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02-06-2008 11:17 AM  10 years agoPost 12
TRex888

rrVeteran

Monmouth, UK

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By default the Jazz uses governor. So you'll get full HS (rpm dependent on throttle% setting) except during the 12s spool up.

There will be no normal mode as such. Try flying with normal mode curves and the ESC will shut down and take 12s to spool up again when you give it low throttle.

Use normal mode to spool HS up only, pitch at mid stick to be zero degrees and full up stick to be 10 or 11 degrees. Make this the same innormal, idle1 and idle2.

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02-06-2008 11:40 PM  10 years agoPost 13
ttsingram

rrVeteran

Lincoln, Ne

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I don't know what your sperm count has to do with anything...
HUH????? WTF?

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02-07-2008 02:26 AM  10 years agoPost 14
Awol_46

rrNovice

Sidney, MT USA

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thanks all fo the anwsers I just got my skids put back on, and am going to go through and check all mentioned here will let you all know what I find out

AIN'T GRAVITY A *BEEP*

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02-07-2008 02:55 AM  10 years agoPost 15
Awol_46

rrNovice

Sidney, MT USA

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ok I messed up somewhere I have +10deg at mid stick so theres part of the prob not sure how this happened

AIN'T GRAVITY A *BEEP*

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02-07-2008 04:24 AM  10 years agoPost 16
Awol_46

rrNovice

Sidney, MT USA

My Posts: All  Forum  Topic

ok started from scratch, I adjusted everything now to 0deg at mid, -2deg at bottom, +5deg at 3/4, and +11 at top. I have my throttle curve at 0 75 75 75 75 norm, 80 80 80 80 80 st1, 85 85 85 85 85 st2. I started to spool it up with align blades that came w/ the heli, had a really bad head shake, so changed blades to my radix, shake was almost gone just a little at low rpms, but I hovered it for about 5secs and seems a lot better now, tail holds great. I don't want to go much farther now till I figure out the head shake, and am sure I have all setting right. Do the main shafts on these bend easy? I have 3 spare I can try to change and see.

AIN'T GRAVITY A *BEEP*

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02-07-2008 04:37 AM  10 years agoPost 17
tadawson

rrElite Veteran

Lewisville, TX

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If you broke blades or pretty much anything on the head, the mainshaft is at risk. Check it . . . it doesn't take much to bend on enough to give you the shakes.

- Tim

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02-08-2008 01:12 AM  10 years agoPost 18
Awol_46

rrNovice

Sidney, MT USA

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no nothing broke, but it won't hurt to check anyway

AIN'T GRAVITY A *BEEP*

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02-08-2008 11:57 AM  10 years agoPost 19
Greybird

rrVeteran

Davie, Florida

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If you know anybody esle that flys heli's, have them check it out, and maybe test fly it.

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02-09-2008 02:34 AM  10 years agoPost 20
Awol_46

rrNovice

Sidney, MT USA

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thats the problem everyone around here flies fixed wing, I think I got it figured out, talked to Wizard for bout an hour last night on the phone and went through my setup. Just have a couple more things to do and will try again

AIN'T GRAVITY A *BEEP*

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