T-Rex Jumpy

[aburl81]

Hi, I just upgraded to a T-Rex 450SE and have only flown it a few times. It is very jumpy......in a hover it will jump up fast a few feet without notice. Is this normal? So far I have been able to regain control, just want to make sure there are no underlying problems I should be aware of.

[Jermo]

Adan,
Have you setup your idle up mode? I found that flying in idle up mode with a flat throttle curve made the chopper less jumpy. As a new pilot you just have to remember to not slam the throttle down if you get into trouble. Ensure throttle hold is setup and use that instead.

As you gain more experience you'll find the chopper jumps less because you adjust for it automagically as well.

[aburl81]

Thanks, I will have to do some reading on that...I am quite comfortable on the sim but have little experience with setting controls.

[Jermo]

Watch the Finless Series for the T-Rex 450SE, CCPM 2 video.

[aburl81]

where can I find that?

[Pace]

where can I find that?

http://www.helifreak.com/showthread.php?t=11373

[kgfly]

Adan,

Do you still have a ratchet (clicking) on your throttle stick ? If so you will need to remove it as the difference between clicks is too much for smoothly controlling a heli.

[aburl81]

I have a smooth throttle stick. I am having trouble accessing the videos in the link above.

[kgfly]

Try these:
http://www.helifreak.com/showthread.php?t=41692
http://www.helifreak.com/showthread.php?t=11373

[Skiddz]

Any wind involved here? Wind will get you into (and out of) translational lift which needs to be compensated for with collective. My 450 gets pretty squirrely in my backyard 'cuz of the wind swirling through the yard.

[aburl81]

Yeah I think wind could be a factor, I have never flown in the wind before. I did most of my learning on a Blade CX2 indoor before I decided to upgrade to the T-Rex. I have flown it a few more times now and have not noticed any sudden jumping. Thank you all for your inputs, they were all very helpful.

[Jermo]

You are pretty close to some very good pilots if you can drive a few hours. Might want to do a general post on the main Helicoptor forum and get some hands on help. It makes a huge difference when you're starting out. Even if it's a 3.5 hour drive it's worth it.

[Lottomunch]

I think I know EXACTLY what your talking about and I agree it can be quite unnerving. My first Trex used to be jumpy like that almost as if it would teleport up or down 2-3 feet without any imput from me. I was not a new heli pilot (glow powered hawk, piccolo, corona, blade cp all prior to this Trex) and I had a horrible time with my trex. I finally tweaked over and over with the head and worked it out. Never did figure out what was causing the effect but it sure did suck.

You're not crazy. Sorry I can't offer anymore.

I'm onto my 3rd trex now and I don't have the problem anymore. I think its in skill with which you build the head.

Daniel

[Lastinch1]

I agree that it will all depend on how well you set up your HEAD
took me 4 complete rebuilds before I finally got it.
I found that using pitch gauge to zero out blades at 50% helped alot
I also redid the links from the top down by making sure the blades were at Zero and the bell mixer arms were level.
Good luck
Be patient

[aburl81]

It is flying good now, I adjusted the throttle curve and had some reciever antennta issues. Thanks for all the input, it is all good stuff for to keep in mind.

[Lottomunch]

Hey Adan......where you located? any chance you in east county?

[aburl81]

I sent you a PM