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T-REX 450 › T-Rex 450 Question?
01-17-2009 12:00 AM  9 years agoPost 1
helinut4ever

rrApprentice

Knoxville, Tennessee-Knox

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What would cause a heli to drop and rise when you're not moving the throttle? It's like it's floating up and down all on it own, I've seen this problem before on another heli but have no clue what's causing it! Any help would be greatly appreciated!!!

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01-17-2009 12:04 AM  9 years agoPost 2
dkshema

rrMaster

Cedar Rapids, IA

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UH -- it's a helicopter. You actually have to learn to fly it and keep it in one place in a hover. Hovering requires constant input from all four stick movements (fore/aft, left/right roll, left/right yaw, and throttle/collective). There is no reason for a heli to remain stationary, in one place or altitude, at a hover (or any other flight mode) on its own.

-----
Dave

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

Team Heliproz

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01-17-2009 12:37 AM  9 years agoPost 3
Mefly

rrNovice

New Fairfield Ct

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Check for loose parts in head/swash/links/blade grips /collar ect

Where's Carlos?

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01-17-2009 01:07 AM  9 years agoPost 4
helinut4ever

rrApprentice

Knoxville, Tennessee-Knox

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I guess you've never had a heli that would hover hands off then! They usually will when everything is functioning correctly and you have them set-up right. This one would before it went to the ground inverted, but it won't now so evidently I have a problem. So I'll check for loose components, find the problem and it WILL hover hands off again. Thanks for the help!!!!

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01-17-2009 03:29 AM  9 years agoPost 5
crashagain

rrApprentice

Redding

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One thing that will cause the heli to rize and fall, that no one mentioned is WIND....
any breeze will cause the heli to Balloon up and down while hovering.
Like eveyone mentioned it's all about collective management. It will take a while, then you will do it without even thinking about it.

Velocity 50 FBL, Trex 600 FBL, Frenzy V2 FBL

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01-17-2009 03:43 AM  9 years agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

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I guess you've never had a heli that would hover hands off then! They usually will when everything is functioning correctly and you have them set-up right
Let's see. YOU know how to set up a heli so it will hover perfectly still, hands off, yet you can't seem to figure out why yours won't at present. That would seem to be a contradiction.

Yes, I know how to adjust a helicopter. I didn't fall off the turnip truck yesterday. Yes, they will stay put for a short while without any input from the operator. No, they won't stay put for any real length of time in a hover without operator input.

There are too many variables in the mix when flying a helicopter outdoors to expect it to stay put in a hover. Of course, yours did before you DRILLED IT INTO THE GROUND INVERTED (that would be a minor detail at this point). If it was perfect BEFORE the crash, and it isn't now, then you either didn't replace all the broken or bent stuff as you should have and you're fighting it, or you forgot how to set a heli up....

-----
Dave

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

Team Heliproz

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01-17-2009 04:20 AM  9 years agoPost 7
chopper_crazy

rrElite Veteran

Delphos, Ohio

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When my dad was first learning to hover his t-rex 450 he had the same problem. At first initially I thought maybe it was ground effect taking place but once I actually flew it, I felt like his sticks were real loose on the transmitter, at least more loose than how I would like it. What I think was actually happening was that he was nervous and when he was making a rudder input he was actually moving the throttle and not realizing it simply because his hands were shaking. You know how that his we have all had the nervous heli shakes. I ended up tightening the sticks for him and he is doing a lot better. I am not saying this is your fix but you might think about it.

It's a complex, costly, glow powered anti-gravity machine!

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01-17-2009 11:36 AM  9 years agoPost 8
itsjojo

rrKey Veteran

North East Pennnsylvania

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I would say a bent spindle, bent main hub in the head, Bent main shaft, Any vibration issues may contribute. How man flights and how old is the chopper - Your main bearings may be bad too. I had ALL of these problems on my V2. When you get a problem like this you need to just keep checking and changing parts to try and find the problem. I have had to swap parts keeping track of them if they make any improvements. Crash damage can be hard to locate if thing are only bent slightly. Keep plugging!

I have learned the smaller the heli the more the tinkering and bench-time. My 600 seems to accept more problems than my 450 v2.

good luck
Jojo

JoJo
Foreseeing My Flybarless Future!

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01-17-2009 01:09 PM  9 years agoPost 9
helinut4ever

rrApprentice

Knoxville, Tennessee-Knox

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Thanks for the help guys, I've still got alot to learn. I actually choose to buy a complete head from someone rather than rebuild mine because mine was litterally desrtoyed from the crash. Well I guess that's what I get for being lazy, I just inherited someone else's problems. I just got through replacing the swashplate and the dampners, they were both wore pretty bad. And I may have to replace the spindle to, I won't know until I get a chance to fly it today. I just thought maybe someone might have had this problem before and could point me in the right direction. I'll rebuild the whole head if I have to to get it flying like it did before. Thanks for the help!!!

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01-18-2009 04:16 PM  9 years agoPost 10
itsjojo

rrKey Veteran

North East Pennnsylvania

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Usually it's the spindle or main shaft but you can have one of those mysterious problems that you have to hunt for. When my main hub bent I had to take every part of the head off and mount the hub itself on the new shaft and spin it up to see it was bent. Still I wasn't sure if it was causing my vibration/tracking problem. When replaced, all was fine. My message here is that sometimes there is no silver bullet, meaning, one thing that fixes all!

This is what I mean when I tell newbies just getting in to helis that you have to get to know your heli too. Knowing what problems to look for from past experiences is very helpful.
Good luck and keep plugging.

Jojo

Don't throw out the old head parts if you get a new head. You will want them down the road.

JoJo
Foreseeing My Flybarless Future!

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01-20-2009 08:44 PM  9 years agoPost 11
Skarn

rrVeteran

Pasadena, MD

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I tend to agree with dkshema...I don't care what heli you have and how good it's setup. A heli will NOT hover hands off! Now if you are talking for a few seconds...sure, but unless you put a 3-axis stabilized system like a helicommand, all heli's have to constantly be controlled to stay in a hover.

Skarn

It's better to burn out than to fade away...

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01-21-2009 01:11 AM  9 years agoPost 12
MickyGilly

rrApprentice

Perrysburg, OH - USA

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You've probably checked this, but how about the linkage ball on the blade grips? I've had mine work its way loose, and it seems like that could produce your symptoms.

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01-22-2009 04:58 AM  9 years agoPost 13
helinut4ever

rrApprentice

Knoxville, Tennessee-Knox

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I finally got it all straightened out guys! I replaced the swashplate, mainshaft, dampners, retracked blades, and adjusted the head to my style of flying! She now flies just like she did before I crashed, hands off in a hover for about 2 to 3 seconds! Thanks for all the suggestions and help to those that really offered it, that's what part of this hobby is all about, helping each other and sharing knowledge! Not beating each other down because someone is a NEWBIE to the hobby, we've all been there at one time or another.

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01-22-2009 06:22 PM  9 years agoPost 14
Skarn

rrVeteran

Pasadena, MD

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Great job bro! And I hope you didn't think we were "beating down the newbie"! Some of us were simply stating that a lot of newbies don't realize that the heli won't hover hands off and it's a constant battle of corrections...but I see in your last post you mention hands off for 2-3 seconds....so sure, that's great!

Skarn

It's better to burn out than to fade away...

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02-04-2009 08:02 PM  9 years agoPost 15
slash1010

rrNovice

ireland

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yes intermittent wind will cause the heli to have more lift when the wind blows and less lift when it reduces, this is because a wind reduces the down draft into blades that happens in still air, the wind moving in from any direction reduces downdraft and so increases lift, the same effect as in ground effect,

obviously in this case its mechanical problems by the look of it now, but as was said before too, wind will affect lift,

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