T-Rex 450 - Servo Question - RCCanada - Canada Radio Controlled Hobby Forum
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Old 09-01-2009, 10:17 AM   #1
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I have just bought a t-rex450 SE it has a mix of servos,

2 HS-65's
1 JR DS-281
and a Tower Hobbies Micro TS-10

I have been told that I need to have all servo's on the head control the same type, is this true ?.

I have some serious head wobble going on when I throttle up, not sure if its the shaft or the pitch, but I wanted to make sure I had my servos correct before I try and fix the wobble.

Any advice would help..I am located in Georgetown ON. and would gladly meet up if anyone has experience in setting this up.

Thanks In advance

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Old 09-01-2009, 01:01 PM   #2
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Re: T-Rex 450 - Servo Question

You really do want all your swash servos to be identical. Not only does the sweep angle vary from one manufacturer to another, but sweep speed can be different for any other model from the same manufacturer. Along with unpredictable handling, you may also experience trim changes with power, (as the swash moves up and down).

The HS-65 is pretty much the standard on the 450 and I would strongly recommend you hunt down at least one more. Some like to go with the more expensive metal geared MG version, thinking them more durable in a boink, but after a year and a half my Karbonite Geared HB models are still going strong.

Your head wobble can be attributed to a few sources, the simplest being blade imbalance or grip bolts too tight. More info is needed, such as what happens as the RPM comes up, if the top of the shaft describes an arc at different speeds, etc.

Others are tracking errors for both the main blades and paddles, a bent flybar rod, (one of my first places to look as it gets ignored too much after an impact. Any damage to the main blades likely means the flybar took a hit).

You want to look for the obvious items as well, such as a worn or broken washout setup. These will really show up once at speed, hence the reason I asked for more info.
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