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09-19-2009 03:56 AM  11 years ago
iceman320

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utah

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ok I got the tail of my exi heli to hold finally but when I'm hovering the heli the slider of the tail rotor goes all the way over to one side and i can't turn the heli in that direction. is there something that I still need to adjust? thanks for the help guys.esky belt cp 450, just built exi 450 pro, trext 500esp, trex 600esp
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09-19-2009 04:11 AM  11 years ago
Gregor99

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Western Wa

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So just to be clear, your tail slider is all the way to one side in a drift free hover? Which side is the tail slider on? What tail blades and headspeed are you running? What's your throttle curve set at?Revolectrix Beta Team
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09-20-2009 04:49 PM  11 years ago
iceman320

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yes the tail slider is all the way over. and yes the heli is drift free. I'm not sure what my head speed is. but my throttle curve is like this 0,45,55,76,100, and the tail slider goes all the way to the left side.esky belt cp 450, just built exi 450 pro, trext 500esp, trex 600esp
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09-20-2009 05:35 PM  11 years ago
Gregor99

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Western Wa

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What motor and pinion are you running? Can you post a picture of the tail includin the blades? What tail blades are you running?Revolectrix Beta Team
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09-20-2009 06:59 PM  11 years ago
iceman320

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i'm running the align 430sp brushless motor with a align 13t pinion. and I'm just running the stock tail rotor blades that came on my exi heli.esky belt cp 450, just built exi 450 pro, trext 500esp, trex 600esp
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09-20-2009 07:32 PM  11 years ago
Heli_KV

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Ottawa, Canada

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Are you sure belt is not slipping?
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09-20-2009 08:30 PM  11 years ago
racin06

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Indianapolis, Indiana

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Iceman,

I think you just need to go back to the basics and setup your tail again. It appears that you have the tail servo and gyro operating in the proper directions, so lets begin with...

1. Ensure that your tail servo arm is installed at 90 degrees to the servo casing. This must be checked when the gyro is in rate mode. If the servo arm is not at 90 degrees, then try another servo arm and/or add subtrim in your radio to obtain the 90 degrees.

2. While the gyro is still in rate mode, loosen up the tail servo mounting screws and slide the tail servo on the boom (back or forth) until the pitch slider is in the center of the tail shaft. In other words, there should be the same amount of exposed tail shaft on both sides of the tail pitch slider.

3. Tighten down the tail servo mounting screws.

4. Power down the heli.

5. Set your gain values in your radio to 60% for both rate and heading hold mode.

6. Switch the gyro to heading hold mode.

7. Power up the heli while the gyro is in heading hold mode and allow the gyro to initilize.

8. Switch the gyro to rate mode.

9. Bring the heli up to a hover and note which direction the heli yaws or rotates. Land the heli...if the heli was yawing CCW, then move the tail servo forward on the tail boom a small amount. If the heli was yawing CW, then move the tail servo backward on the tail boom. If you have adjustable links on the tail push-rod, the you can make these adjustments by turning the links to either shorten (if the heli was yawing CCW) or lengthen (if the heli was yawing CW) the tail push-rod. Bring the heli back into a hover in rate mode and note what the previous adjustments did to the heli. Keep doing this process untill the heli hovers with no yawing. It will probably take you a few times to obtain a yawing-free heli.

10. While still in rate mode, bring the heli back into a hover and increase the gyro gain until the tail begins to wag, then back down the gain a small amount at a time until the tail no longer wags. You will probably have to land the heli each time you make a gyro adjustment...at least that's how I do it.

11. Perform the same process as in Step 10 above, EXCEPT this time while the gyro is in heading hold mode.

This is how I set up the tail in my HBK2 and Mini-Titan. This method has never failed me yet.
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09-20-2009 09:19 PM  11 years ago
iceman320

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so how can I tell if the gyro is in rate mode or heading hold mode? and how can I tell if my switch for it on the tranmitter is working right?esky belt cp 450, just built exi 450 pro, trext 500esp, trex 600esp
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09-20-2009 09:44 PM  11 years ago
racin06

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Indianapolis, Indiana

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First of all, which tx are you using? Also, wiggle the rudder stick a few times...if the tail servo arm moves back to center, you are in rate mode. If the tail servo arm tends to not center after wiggling the rudder stick, then you are in heading hold mode.
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09-20-2009 10:20 PM  11 years ago
iceman320

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utah

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I'm using the airtronics rds 8000 txesky belt cp 450, just built exi 450 pro, trext 500esp, trex 600esp
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09-22-2009 06:42 AM  11 years ago
Gregor99

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Western Wa

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Is the tail completely stock? Any chance I can see some pics of the tail in the position that results in drift free hover? It would also be good to see the amount of pitch on the tail blades required to hold a drift free hover.Revolectrix Beta Team
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09-22-2009 03:34 PM  11 years ago
iceman320

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greg, I will try to post up some pics later tonight after I get home. And yes the tail is completly stock.esky belt cp 450, just built exi 450 pro, trext 500esp, trex 600esp
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09-23-2009 02:57 AM  11 years ago
iceman320

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I think that I got my tail problem fixed i flew the heli tonight and It seemed to move the same speed when I done a pyro spin in both directions so i think that I have the tail problem fixed. but I noticed that in the 15-20 mins that I was hovering that the motor got hot and I could not keep my finger on it. so I was wondering what tooth of pinion gear are some of you guys running on your t-rex clones? thanks.esky belt cp 450, just built exi 450 pro, trext 500esp, trex 600esp
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09-23-2009 04:23 AM  11 years ago
shizack

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Aiken, SC USA

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iceman320 (Chuck Liddell?):...15-20 mins that I was hovering that the motor got hot and I could not keep my finger on it.
Uhhh...yeah. 15 minutes straight of hovering will do that.

What's your mechanical setup?
Motor - pinion - battery - esc/bec?

What are your throttle and pitch curves and at what stick point does the heli hover?

In my EXI I have an Alpha 400 with a 12T, Volcano 30 ESC, and Zippy 3S 2300 20-30C LiPos. I only get about 7 useful minutes out of it.
A soul in tension is learning to fly
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09-23-2009 04:33 AM  11 years ago
Gregor99

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Western Wa

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so i think that I have the tail problem fixed.
Just we can play along, exactly what did you do to fix the tail?

Shiz is correct, that's too long of a flight and will kill most packs in a short amount of time. Best thing to do is use your charger's "mah in" report to ensure you are not discharging beyond 80% of the pack's capacity. For most setups, that's between 6 and 8 minute flights, but can be longer or shorter depending headspeed, pack size and about a dozen other variables. Regardless, 15-20 mins is way to long. Also need to give your brain a break too.
Revolectrix Beta Team
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09-23-2009 05:08 AM  11 years ago
iceman320

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my motor is a align 430sp brushless motor with a 13t pinion. and a exceed esc. I don,t have a bec yet. but do plan to add one shortly. And to fix the tail problem I just went a set up that tail again except I didn't mess with the gain control on the gyro at all I just left the gain control alone.esky belt cp 450, just built exi 450 pro, trext 500esp, trex 600esp
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09-23-2009 06:00 AM  11 years ago
shizack

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Aiken, SC USA

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430SP - that's a 3700Kv motor. So, with a 3S LiPo...

You'd be running near 3000 rpm at hover speed. That's a good bit too high, bordering on dangerous unless you use a metal head with carbon fiber blades. I highly recommend getting an 11T pinion until you're used to this bird. I can send you one or two if you can't locate one or can't afford one (if I can find my old ones).

I use a 3500-ish kV Alpha 400 with a 12T and that gives me plenty of headspeed, and I'm getting into basic aerobatics and flips. Your motor is trying to pull way too much amperage from your system. Some kind of failure may be imminent.

Can you give me your pitch curve? I think we can work this out.
A soul in tension is learning to fly
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09-23-2009 06:42 AM  11 years ago
shizack

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Aiken, SC USA

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First, I see your throttle curve is 0,45,55,76,100. That means you're under 80% throttle until near full stick. Electric motors will run hot if they're run at too low a speed. has to do with the pulses from the esc lasting too long at each point, blah blah.

Set your throttle curve to where you have at least 80% at mid-stick. 90 would be better. With that 13T pinion you'll be approaching warp speed, so you should probably wait until you get an 11T.

Your pitch should be set so that in normal/non-idle up mode you have 0° at mid-stick, 9° or 10° at high stick, and between -2° and -4° at low stick. In idle up/stunt mode you should get -9 or 10° to +9 or 10° with 0° in the middle.

Quick and dirty head setup (I love quick and dirty head....setups )

Set your idle up/stunt mode pitch curve to linear - 0 25 50 75 100.

Start with your swash about 10 or 11mm up the shaft from the bearing block. A blade holder is about the right thickness. This should be done in idle up with the motor disconnected, throttle stick in the middle, and servo arms adjusted to 90°. Adjust ball links to get the swash at the right height and level.

Start twisting links in the head assembly until EVERYTHING is level like in the picture. After you have achieved levelness...

Check blade pitch. If it's 2° or more off of 0°, adjust the short blade grip links accordingly. Less, use the long pitch links. Once you have the blades less than one degree off of 0°, pick a blade. Any blade. Not that one. Just kidding. That one's fine. Mark it and it's grip and use it as the "Master Blade". Make all future pitch adjustments on the OTHER blade to avoid screwing up the pitch between them.

Assuming you have the 11T installed:

Set normal throttle curve to 0 43 85 95 100
Set normal pitch curve to ~30 ~40 50 75 100
Unplug the heli
Reconnect motor to esc
Hover in normal mode to check tracking
Adjust the "other" blade if necessary to get tracking better

A soul in tension is learning to fly
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09-23-2009 03:43 PM  11 years ago
iceman320

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utah

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shiz, this is my pitch curve 0,51,66,86,100.esky belt cp 450, just built exi 450 pro, trext 500esp, trex 600esp
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09-24-2009 12:25 AM  11 years ago
zaw

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Lebanon, NH - USA

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look like you will slam the heli down with that curve.

mine normal is 43 45 50 75 100
idle up with 0 25 50 75 100

Normal throttle 0 85 90 95 100
Idle up throttle 100 100 100 100 100

my esc and motor are cool to touch after 7min for flying.
ಠ_ಠ HBK2 built with inexpensive parts! ٩๏̯͡๏)۶ Gaui425
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