Tail problems

[Cralis]

Hi Guys.

I'm having hassles with my tail on my EP550..

When I put in full left or right rudder, the heli only yaws very slowly...It would take about 2 or 3 seconds to do 360 degrees.

Looking at the slider, it LOOKS like it's going 100% left to right.... Any ideas?

No Expo set.

[xfaega]

What gyro are you using? If a futaba check that your tail blade pitch slider is getting full rang from center to left and center to right. Also check your delay setting that also could cause your Hurri to yaw very slowly.

[Cralis]

I am using a 401. The delay is set to 0. Digital servo is switched on (I have the servo the 401 comes with on the tail). When the stick is at centre (rudder), should there be zero pitch on the tail, or should there be some pitch at centre stick?

[oppie]

I am using a 401. The delay is set to 0. Digital servo is switched on (I have the servo the 401 comes with on the tail). When the stick is at centre (rudder), should there be zero pitch on the tail, or should there be some pitch at centre stick?

It looks like from your list of helis in your barn that you have had experience with gyros and such. Have you gone down the Finless check list in his build videos about the Hurri 550? Check that the tail slider isn't rubbing on the bottom of the tail case. Check that the screws arn't to tight where the grips connect.

[xfaega]

On finless video he talked about he rudder being of center with a slight pitch. the way he fixed this was to move the ball down one hole to the 3rd hole on the futaba star horn. I did that it put the tail blades a 0 pitch. I not sure how much the delay may affect the tail. But I have also 0 delay and had no problems yet. Like oppie said check to make sure that nothing is to tight. or make sure that there is no binding on the push rod.

[Cralis]

Thanks guys. Where is the finless bob video specifically for the tail?? I'm battling to locat that bad boy...

I tried a flight this morning, and the tail was very sluggish... Full left or right rudder is moving too slowly... I saw a guy test his EP550 last night, and his tail was amazing... Same 401 etc... So I definitly have a problem.

I then though... mmm.. lets up the headspeed. Maybe the tail isn't spinning fast enough to throw the tail around?

So I upped it a bit.. 5% on each point... and there was a slight improvement. Can someone who has an EP550 with the 1100kv engine, please tell me their pitch and throttle curve for Normal flight mode?? I think I go 0, 50, 65, 80, 100 on the throttle... and can't recall the pitch... -4, 0, 3, 7, 9 or something.

[mjdee14]

Thanks guys. Where is the finless bob video specifically for the tail?? I'm battling to locat that bad boy...

I tried a flight this morning, and the tail was very sluggish... Full left or right rudder is moving too slowly... I saw a guy test his EP550 last night, and his tail was amazing... Same 401 etc... So I definitly have a problem.

I then though... mmm.. lets up the headspeed. Maybe the tail isn't spinning fast enough to throw the tail around?

So I upped it a bit.. 5% on each point... and there was a slight improvement. Can someone who has an EP550 with the 1100kv engine, please tell me their pitch and throttle curve for Normal flight mode?? I think I go 0, 50, 65, 80, 100 on the throttle... and can't recall the pitch... -4, 0, 3, 7, 9 or something.

Maybe your right about the low headspeed... I have my TX set up so 0 pitch is at midpoint....no matter what mode your in....Norm, Idle up 1 etc.

Most helis hover in the 5 - 6 deg range, so with your points your trying to hover below 80%. try upping the throttle even more....like 0, 50, 85, 85, 100 or something like that...and see if that makes a difference...higher headspeed will try to make the heli spin oposite faster...and in turn you'l need more tail pitch to compensate.

I'm using a DX7 and I believe my pitch is -3, -3, 0, 6, 10, throt is 0, 50, 80, 95, 100
may not be exact, but close to it..as I now go mostly by feel and make adjustments accordingly and really don't worry much about the numbers.

[Pinecone]

Your headspeed is too low.

I run 0 - 60 - 80 - 90 - 100 in normal and 100 - 95 - 90 - 95 - 100 in Idle Up and mainly fly in Idle Up.

Also check your Rudder endpoints. They should be at least 100, and you can up that to get a faster piro rate.

[Cralis]

Thanks Mjdee14... I'll try your settings. I'm on a DX7 as well, so will try what you say. Than ks.

Pinecone, thanksas well. I'll not being going idleup yet.. :) ... but I have one majot worry... My end points on my rudder are 58% left and 58% right... At that, my rudder servo goess to JUST before the bind point... Maybe... maybe I need to move the scxrew in a few holes on the rudder servo horn?

[Mikej]

Thanks guys. Where is the finless bob video specifically for the tail?? I'm battling to locat that bad boy...


The 550 videos are here ..... http://www.helifreak.com/showthread.php?t=31211

[RBV]

I believe your rudder endpoints are what determine your piro speed. You set your rudder travel limits with the 401 gyro, not the radio. If you increase your rudder endpoints you should see your response rate go up!

[WhirlingBladesOfDeath]

RBV is exactly right. Set your ATV's to 100 and adjust the endpoints with the 401.

ATV's on the the rudder have nothing to do with servo travel. The rudder channel tells the gyro how fast you want to piro, and which direction, not how far to move the servo. The gyro takes the input and then decides how far to move the servo to accomplish the request from the rudder channel.

Having your ATV's set to 58% means you can never tell the gyro to piro faster than 58% of what it thinks the max is.

HTH,
Jason

[Mikej]

RBV and WBOD

Is this just with the 401 or with all gyros ?? My Telebee doesn't have a way of adjusting the travel.

[WhirlingBladesOfDeath]

Mike, I don't know!? I've never used the Telebee gyro. I've only set up the 401, and now a Spartan DS760, which on both ATV's control your piro rate.

I guess I should have put a disclaimer, that I was only talking about those two.

[raptordave]

Hi Guys.

I'm having hassles with my tail on my EP550..

When I put in full left or right rudder, the heli only yaws very slowly...It would take about 2 or 3 seconds to do 360 degrees.

Looking at the slider, it LOOKS like it's going 100% left to right.... Any ideas?

No Expo set.

on a 401 try turning up the endpoints in the transmitter to increase the piro rate.
Dave

[RBV]

Sorry - I was assuming you had a 401. I did a quick google search and found that you still need to set your rudder endpoints at 100% and set your travel limits by adjusting the throw of your servo arms by moving in or out on the holes. If you do a google search you on telebee gryo instructions, you will find several examples and walk-throughs. Hope this helps.

[Pinecone]

That's your problem. You do NOT set the tail slider throw with the rudder endpoints. You set them with the Gyro Limit pot. The end points set the max piro rate. So you are only using a portion of the available travel.

Put your end points back to 100. With your gyro in Normal or rate mode (no solid red light on initialization), adjust the limit pot on the gyro to set the max travel on the tail slider. For best performance, you want to adjust the distance the ball is from the center of the servo horn to have the limit between 80 and 100 for the 401.

This will get your piro rates up to normal. And if you want more, you can up your end points.

The Finless Tech section has a good video in the Trex 450 thread on setting up the 401.

[Pinecone]

For Telebee info, check the Finless Tech Room under the HDX300 for a telebee gyro setup.

I used one on an EP-100SE I had, and used the video and it worked fine.

BTW the guy who started this thread IS using a 410 I am using a 401.

[Cralis]

Thanks very much guys... I've adjusted the EPA settings... It's windy, but I'll take it out for a quick bash... Expect news... :)

[Cralis]

Success!!
Now I am just left with two small problem..
The tail drifts. If I land, and don't touch anythig, then take off, the heli turns... If I hold a hover, it drifts slightly.. slowly.
Also, it wiggles a bit... Any idea?
Gyro at 75% gain. This is in HH mode...

[xfaega]

Make sure your pitch slider is centered. The pitch arm that moves the pitch slider should be 90 degs. Also make sure that the arm on the tail servo is 90 degs. straight up and down. When centering the pitch slider make sure you are out of HH the reason for this is to get true center on servo and pitch slider.