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T-REX 450 › SE V2 tail issue ... I think ...
07-10-2008 07:47 PM  9 years agoPost 1
TJinGuy

rrProfessor

Socorro, NM - USA

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Ok I just bought a used Rex450SE and it has the V2 tail on it. When I started to set up the tail I noticed that if I center the tail pitch slider, there is a ton of negative (make heli go CCW fast) on the tail blades. Here is a photo of where I would guess is the neutral spot on the pitch slider. In other words, where the blades should be when it is in a hover and stable.

Looking closer I see that the shaft is a 450SA shaft. Should that make a difference? Are they different lengths? Does anyone see anything else wrong?

- Chris

Team New Mexico
TJinTech

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07-10-2008 08:21 PM  9 years agoPost 2
USNAviationjay

rrElite Veteran

Houston Tx USA

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that's not mechanical neutral which is where it should be.
that is also not the SA shaft that is a V1 plastic shaft. The SA is white and 3 pieces and known to fail.
and they are the same except the V2 is metal and 1 piece.

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07-10-2008 08:27 PM  9 years agoPost 3
Skarn

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Pasadena, MD

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The only thing that I notice from that picture is that you don't have the slider centered. When centered, it should be zero pitch or damn near close to it.

If you have a ton of negative pitch on the tailblades with the slider centered, something isn't right. Show us a pic of what it looks like with the slider centered.

Skarn

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

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07-10-2008 09:03 PM  9 years agoPost 4
TJinGuy

rrProfessor

Socorro, NM - USA

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I will do that when I get home but I can assure you that with the slider centered, the pitch is very negative.

- Chris

Team New Mexico
TJinTech

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07-10-2008 10:05 PM  9 years agoPost 5
Sean Williams

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Santa Clarita CA

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That slider is not centered, plain and simple. You can't argue that. If your tail servo's centered, to center the slider, bend both tail blades back so they are on top of each other then adjust the tail linkage to get them perfect.

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07-10-2008 11:07 PM  9 years agoPost 6
TJinGuy

rrProfessor

Socorro, NM - USA

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A few things things. One is that I know the tail slider is not centered. I placed it where the pitch on the blades was about that of my MiniT when it was "neutral" or where the gyro initializes it. That should be about where it is in a stable hover. The Mini slider centers up well in that position but the Rex did not. Next I found that the hub was not all the way to the end of the tail shaft. It was back a tiny bit and so that pushed the tail blades more negative. I made the shaft flush with the hub and that helped a little.

With the tail slider centered (this is centered ... right?), the blades still have slight negative.

I also noticed that the other end of the shaft protrudes a bit. This would effectively shorten the shaft and would in turn add negative pitch to the tail blades. Here is a pic of that

Does all that seem right?

- Chris

Team New Mexico
TJinTech

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07-11-2008 03:06 PM  9 years agoPost 7
Skarn

rrVeteran

Pasadena, MD

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Much better

But to be picky, it's still not exactly centered. If you look at the actual shaft, you can still go a tad bit more and it would get to zero pitch.

But regardless it should work fine now if everything else is setup properly.

Have you flown it again yet?

Skarn

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

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07-11-2008 03:33 PM  9 years agoPost 8
TJinGuy

rrProfessor

Socorro, NM - USA

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I took it out for the first hover last night between rain storms and it is flying very well. I am getting some slight gear noise but I am guessing most of that is due to the very hard gears running. I am starting out with a 11T Rhino steel gear and the dark blue main gear. It is not bad but it is not as quiet as my Mini in that regard. It is definitely fuel efficient in its' current state though. I ran about 7min of low and medium head speeds in low hovers and it only too 888mAh out of my Outrage 2200 battery. A tiny bit of that may also be from the s3114 servos I am running, compared to the DS285s in the Mini. They are working just fine. I also weighted everything last night for kicks and I found

Rex450SE (3xs3114, GY240+s3115, Align 35A+430L, 3A BEC, Fasst rx, Align woodies, fiberglass canopy) = 625g

Mini Titan (3xDS285, GY240+HS81, TT 40A+stock motor, 3A BEC, Fasst rx, Align woodies, plastic canopy) = 680g

Stock King2 (3xs3114, ESky HH gyro+ESky 8g, Dynam 30A+Esky 3900 motor, Fasst rx, ESky woodies, plastic canopy) = 365g

- Chris

Team New Mexico
TJinTech

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07-11-2008 07:20 PM  9 years agoPost 9
Skarn

rrVeteran

Pasadena, MD

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Excellent! I'm glad it flies good now!

As far as your gear noise....I had that before and my pinion was too high and was partially hitting the autorotation gear...

Skarn

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

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07-11-2008 08:29 PM  9 years agoPost 10
TJinGuy

rrProfessor

Socorro, NM - USA

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I think the gear noise is from the use of the gears and the mesh. I have readjusted it 2-3 times with little change. As for the gear height, I have it so that the pinion just barely clears the top of the main gear.

- Chris

Team New Mexico
TJinTech

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T-REX 450 › SE V2 tail issue ... I think ...
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