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Home✈️Aircraft🚁Helicoptere-AlignT-REX 450 › T-Rex 450 like helicopter tail not holding
05-25-2007 08:52 AM  13 years ago
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Janis

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Århus, Denmark

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T-Rex 450 like helicopter tail not holding
Hello Guys,

I have got a problem with my T-rex 450 sized heli. It has Radix 325 bldaes and the JGF 500TH motor and the Jazz 40-...regulator.
My Motorpinion is 14 tooth. The gyro is a 401 with a HDS-577 18g Micro Digital Servo.
My problem is that if i go for climb out the tail turns to the right.
I have checked the max throw and no binding. If I do staionairy rolls the tail can hold it. But if I try to make som tic toc's the tail start to move. I have the 450 carbon tail blades.
Now I saw that the new T-Rex 450 V2 only have a tail gear ratio of 4,24:1. My heli has about 4,95:1. Can this be the problem?
Furthermore i did not use the delay on the 401 cause I dont know what it is for.
Maybe some one can help out.
regards from Denmark

Janis Andersen
...exist something better than V-bar and women...
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05-25-2007 09:16 AM  13 years ago
Trooper Sam

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Perris, California - USA

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Delay should remain at zero. It sounds like your belt may not be tight enough.

Does your tail go out when you do a full collective punch-out?
Trooper Sam

We do not do this to save money, we save money to do this-TheRickster
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05-25-2007 09:33 AM  13 years ago
Janis

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Århus, Denmark

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Hi Sam

Yes it does.And i the travel to the site wher you need most, is enough.
I know that for sure.

regards Janis
...exist something better than V-bar and women...
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05-25-2007 11:57 AM  13 years ago
impi62

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South africa

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Try lowering pinion size. 14 tooth could certainly cause torque swing on punch out that even the 401 would have a problem keeping in check. What headspeed are you running and what percentage on the Jazz?
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05-25-2007 12:27 PM  13 years ago
Janis

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Århus, Denmark

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Hi,
Try lowering pinion size. 14 tooth could certainly cause torque swing on punch out that even the 401 would have a problem keeping in check.
But Leon Luke is using a 15 tooth pinion, and he's 401 seems to hold it quiet well
I run only 2700 on the head with 80% on the Jazz.
I just thought to use Raptor 30 tailblades since they are longer thatn the T-Rex 450 carbon.

regards from Denmark
...exist something better than V-bar and women...
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05-25-2007 03:04 PM  13 years ago
lsurber

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Fort Worth, Texas - US

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I just use collective/rudder mix in radio, works well! The problem is that any time you change blades, belt tightness, motors, or pinions you have to change the mix again.

You will hear people saying that mix is only for throttle but that's not true........collective also causes torque rotation!

Just my 2 cents!

Lee
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05-25-2007 03:10 PM  13 years ago
drdot

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So. California, Orange County.

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💎Sustaining Member
fwiw..

Drop a tooth, get the h/s at or slightly above 3000..Reduce max pitch if necessary...One or more of these will help the issue..

How much gain do you have on the 401, and is it in HH when flying?

John.
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05-25-2007 07:18 PM  13 years ago
Tommy Z

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Lubbock, Texas

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I agree
Try dropping a tooth...I felt that even a 13 can bog at times.
Leon Luke may have one of the hacker motors with the lower Kv.
Someone correct me if I'm wrong here.
-Tommy Boy
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05-25-2007 07:22 PM  13 years ago
caseyjholmes

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Portland, Oregon

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extend the possible tail pitch travel
(slide the tail hub off the tail shaft about 1.5-2mm)
Then recenter your linkages.
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05-27-2007 07:13 AM  13 years ago
Janis

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Århus, Denmark

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Hi Gs,

Thanks for all the information.
I fly with HH mode n the Gyro, the gain is about 50% in the DX 7. Maybe this is too low? I dont know what the gain will be in the gyro.
The videos i saw with Leon Luke, there he was using the JGF 500TH just like me but with a 15 tooth pinion. Correct me if i am wrong.

I have extended the travel so that the tail blades are nealy aout 45degrees at max throw, Should be enough.

I will try a 13 tooth pinion and a higher gain in the DX 7.

regards from Denmark

Janis Andersen
...exist something better than V-bar and women...
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