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Home✈️Aircraft🚁HelicopterBeginners Corner › Trex 500 Blade Tracking Question
02-27-2012 01:34 PM  9 years ago
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rrApprentice

Toney, AL. USA

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Trex 500 Blade Tracking Question
What would cause the blades to go out of perfectly good tracking after only 5 hover flights? I noticed on a spin up that there is some off tracking going on and don't know why/how.

I watch the LHS perform the adjustment and have watched a couple of you tube videos but can you not use a pitch gauge to see which blade is out of pitch?
Trex 500FB Trex 600ePro McpX. Synergy E7SE
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02-27-2012 01:48 PM  9 years ago
wrongler

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Brewerton, New York

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At mid stick both blades should be at zero pitch, If one is not, that is probably the one that is out. Bad dampers will cause the problem, bent spindle also.Bill Whittaker
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02-27-2012 02:08 PM  9 years ago
B.T.D.T.

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NY

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At mid stick fold the blades together. They should be level together. Now you at at zero pitch.

If you hover and bounced the landings, your spindle may have bend or as posted above, your dampers may be worn.

To check the spindle, remove one blade and extend the other. Insert allen key to the grip and turn the screw/spindle if the other blade goes up and down, your spindle is bent. Look at both blade grips while doing it also.
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02-27-2012 03:12 PM  9 years ago
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rrApprentice

Toney, AL. USA

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I got them tracking now. I set the TH and noticed that one blade was out using pitch gauge. Did 1 turn on that grip eyelet and she trued up perfectly. I'm going to hover one more time before the feather shaft for straightness. Thanks Wrongler and BTDT.

I still have a hard time trusting the TH when I go to mid stick! I had a bad time with the blade sr once that I will never forget. I can't get to my motor plugs to disconnect so it brings the hair up on my head when I TH.

By the way I have no hair on my head. I have a CH-47 flying overhead so got to it for now. Thanks.
Trex 500FB Trex 600ePro McpX. Synergy E7SE
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02-27-2012 05:17 PM  9 years ago
B.T.D.T.

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NY

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You can move the motor / pinon away from the main gear during setup. I think on mine I had to remove one screw to be able to move it that far away from the main gear.
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02-27-2012 05:42 PM  9 years ago
CX1

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Canada

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At mid stick fold the blades together. They should be level together. Now you at at zero pitch.
only works if you hold the heli on it's side in mid air. letting the blades dangle freely they should lign up to each other

you can use a 6v flight pack to do your set up just plug it in to the throttle channel or as mentioned move your pinion away from main gear

a bent spindle or bad dampers will cause what your experiencing
" Team Protoast "
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02-27-2012 06:14 PM  9 years ago
Stephen Born

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USA

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Gary, did you crash your 500? If not, it is not your spindle. Your kit came with two color dampeners, red and black. Black are rigid and red are soft.
I still have a hard time trusting the TH when I go to mid stick!
Just make sure you hit TH and not any other switch. Always good to look before you flip.
I can't get to my motor plugs to disconnect so it brings the hair up on my head when I TH.
Even though you are on TH, DO NOT put your face close to the blades. Even though TH is initiated, you know as well as I, electronics fail. When you are at midstick, and TH did fail, it would spool up quickly. I know it takes time to unplug the esc from the motor, but sometimes that is the safest method. Also, if you do unplug the motor from the esc, make sure you unplug 2 wires.
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02-27-2012 07:33 PM  9 years ago
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rrApprentice

Toney, AL. USA

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The pinion Sounds like a possible option. Just to raise batt panel to get to them. AerialSkyCam, I would need to take bottom lose to get to the motor wires. Gyro is on bottom shelf and it's cramped down there. I still have a slight wag but I have put a second layer of tape under gyro. Would have to do another setup after that?

I have not crashed at all yet, only when the low voltage on ESC did it come down. But it came down from about 12" on skids.

Of the rubber things I put the begginer ones it said to, I think they were grey. I still have the black set.

I ran 6 batts today of just hovering and did good. I did some quick throttle changes just to see how it would climb, it does!

I'm changing at 3c now, 7.8 amps and it only takes 15 minutes to charge compared to 40. Will start different orientations soon so hope all goes well. Thanks guys for the help.
Trex 500FB Trex 600ePro McpX. Synergy E7SE
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02-27-2012 08:10 PM  9 years ago
Stephen Born

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USA

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AerialSkyCam, I would need to take bottom lose to get to the motor wires.
Got it. If your not unplugging the motor from the esc, then I would tell you to at least take off the main blades. However, if your trying to track your blades, that would'nt help you any.
I still have a slight wag but I have put a second layer of tape under gyro. Would have to do another setup after that?
Since you already have two layers of tape, check what your gyro setting is on your Tx. I believe you are using the DX6i, so rate mode is 0% - 49%, and heading hold is 50% - 100%. You should be around 50% to 65%. See if that helps your wag. What are you at now?
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02-27-2012 09:51 PM  9 years ago
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rrApprentice

Toney, AL. USA

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It's sitting at 68%.Trex 500FB Trex 600ePro McpX. Synergy E7SE
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02-29-2012 05:54 AM  9 years ago
Solmanbandit

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Tucson , AZ

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Since you already have two layers of tape, check what your gyro setting is on your Tx. I believe you are using the DX6i, so rate mode is 0% - 49%, and heading hold is 50% - 100%. You should be around 50% to 65%. See if that helps your wag. What are you at now?
That is a common misconception on most gyro's. Most gyros are changed from rate to heading mode through the gear switch. I've had my gyro below 50% and was still in HH mode. Is your tail wagging side to side or up and down? If side to side is it wagging fast or slow. It may be that your gain is too high. If it is swaying, then your gain may be too low. If it wagging, that would normally mean that your gain is too high. What gyro are you running?
Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2
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02-29-2012 12:14 PM  9 years ago
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rrApprentice

Toney, AL. USA

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I'm running a GY 780 gyro and yes the tail is a side to side wag slowly. I changed the gain from 68% to as low as 58%. The thing I can notice is it slows the wag down but does not stop it.

With that said do Trex 500's with belt drive tail always have a wag?
Trex 500FB Trex 600ePro McpX. Synergy E7SE
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02-29-2012 01:40 PM  9 years ago
rcmiket

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El Paso,Texas

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Seems like the general conscientious is the Align 780 sucks. I've had issues with a number of them. The 500 likes high head speed also. You might try that.
Mike
"When Inverted down is up and up is expensive"
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02-29-2012 01:47 PM  9 years ago
Stephen Born

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USA

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The Align GP750 is a bit more effective holding the tail than the GO780. You received the 780 in your kit.

I agree with Mike in regards to your HS. If you have time, get a hold of me today.
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02-29-2012 03:03 PM  9 years ago
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rrApprentice

Toney, AL. USA

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Mike I'm not sure what the head speed is on this bird I just know that it's fast. How can you tell the speed without a radar gun or what ever you call it?

AerialSkyCam I will call you later today, thanks.

Gary
Trex 500FB Trex 600ePro McpX. Synergy E7SE
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02-29-2012 03:10 PM  9 years ago
rcmiket

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El Paso,Texas

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Don't own a tach just kept playing with the headspeed till it helped solve the wag. As I said the 780 is not a good gyro IMO. Seems like some have luck with them and some don't. I've worked on a few 500's with other gyros that preformed well. To me replacing the gyro is money well spent.
Mike
"When Inverted down is up and up is expensive"
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02-29-2012 03:21 PM  9 years ago
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rrApprentice

Toney, AL. USA

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Thanks Mike, what are other gyro's that could work with the Treex500? I'm running a Futaba S9257 tail servo if that means anything.Trex 500FB Trex 600ePro McpX. Synergy E7SE
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02-29-2012 03:27 PM  9 years ago
rcmiket

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El Paso,Texas

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A lot of guys talk highly of the Spartan. Also the GY520. Maybe someone will chime in here. I have worked with the Spartan on the 500 with good results.
Mike
"When Inverted down is up and up is expensive"
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02-29-2012 03:56 PM  9 years ago
SGM Retired

rrApprentice

Toney, AL. USA

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Thanks Mike will wait for more suggestions and move out smartly.Trex 500FB Trex 600ePro McpX. Synergy E7SE
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02-29-2012 09:34 PM  9 years ago
Solmanbandit

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Tucson , AZ

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I would lower your gain down a couple of clicks each time until the tail wag goes away. I also don't like or trust Align gyro's. I used to really like the GY520, but I have had two go bad and I am done with them. Believe it or not, I have been flying with a GA250 gyro which is clone gyro of the Spartan. For $15, it works fantastic! I have used it in a 600 and currently my 450 and I have no complaints. I am normally not a big fan of clone stuff, but this gyro works fantastic.
Mike I'm not sure what the head speed is on this bird I just know that it's fast. How can you tell the speed without a radar gun or what ever you call it?
You can either do it this way:

Head Speed = ((Motor Kv x Battery Voltage) / (Main Gear Teeth / Pinion Teeth)) x Efficiency Coefficient

Or you can do it the easy way:

http://dhrc.rchomepage.com/calc.htm

Plug the information into the right side of the page for your headspeed.
Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2
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