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HomeAircraftHelicopterBeginners Corner › Tail spin rate issue
12-31-2010 06:57 PM  7 years agoPost 1
birdsofpray

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Lake Villa IL

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Hello everyone, thanks to Runryder and the help of all of you I don't feel like I'm flying solo here. That being said I have another dilemma, today was my first maiden hover with my e-razor 450. I have had it for two weeks now going over this ready to fly bird before I made any attempt to fly it. I had since switched out receiver so I could use my dx7 I set everything up to the best of my ability and had a friend double check. I hovered and had a slow wag so kept upping the gain till it felt locked. took it up eight feet and spun it around, it went around beautifully left so i tried right to see if the spin rate was the same and to my surprise it kept ticking on and off for a lack of better description. It would go approx six inches then pause then six inches then pause all the way around without me changing anything at the stick, it was ugly. My question to you is what could this be and how to correct. thanks in advance.
I will be away from computer for about an hour but will check when I get back thanks.

What goes up must come down, It's how hard and painfully it comes down is what really matters.

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12-31-2010 08:17 PM  7 years agoPost 2
RCHSF

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NC

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Tell us what gyro your using. I suppose your using a Ar6100?
Your gain maybe to high. Make sure your gyro wires are not running along beside your ESc, if they are in the same area. I have had the ESC to make my gyro pulse before "I believe if it was not my imagination". Is that all you changed out just the RX? I would guess maybe being you had another rx in that heli, then maybe it was adjusted to it, and changing rx's may throw the gyro off being it's so sensitive. May need to re adjust it all in your tx. Whats your gain setting under gyro sensing, unless your useing gear end points.

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12-31-2010 10:07 PM  7 years agoPost 3
birdsofpray

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Lake Villa IL

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My gyro is a cheap Detrum GY192 and its so cheap it doesn't even have a travel adjust pot on it. It came with the Helli as a RTF unit the gyro is a whopping twelve dollars. For the ESC, it is bunched up at the receiver so the ESC wires is jumbled up with everything but not directly near the gyro unit itself. I do not have any sub trim or travel adjust added to rudder at all nor do I have any trim added at all. Thanks again for taking the time to help with this.

What goes up must come down, It's how hard and painfully it comes down is what really matters.

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01-01-2011 01:06 AM  7 years agoPost 4
RCHSF

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NC

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You might want to upgrade to this gyro, it's a great gyro so the reviews says on this page under the gyro. I'm going to buy one when I get a heli. http://www.hobbypartz.com/60p-dy-1017.html

Shipping is free also.

You say it has no travel adjustment? I just looked this gyro up. It does have a gian on it right? Are you useing thr remot gain wire pluged into your rx? if your useing it in the gear ch, you use gear end points I belive to set your gain. Where is your end ponits set for your remote gain if your useing remote gain? Need more info.

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01-01-2011 01:57 AM  7 years agoPost 5
birdsofpray

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Lake Villa IL

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Thanks for trying to assist me with gain set but I have that understood now. My dx7 radio has a option to set which channel uses gyro which I set as aux 2 and have my gain set to 82 on the heading hold side. The issue that this gyro has is it don't have travel adjust pot on gyro itself so I believe there is no way to set the limits. If the Helli is sitting on the bench and you throw full left or right rudder the servo goes to far and binds. Friend of mine told me it would behave different in flight and not worry but kinda concerns me. I do see that the gyro you recommended and it does look good to me and does have the limit adjust I need so I will swap it out. I hope this fixes the spin rate problem also.

What goes up must come down, It's how hard and painfully it comes down is what really matters.

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01-01-2011 01:59 AM  7 years agoPost 6
birdsofpray

rrNovice

Lake Villa IL

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I did notice that the main gear has a bad wobble in it, is this a big issue and could that be causing the weird spin characteristics?

What goes up must come down, It's how hard and painfully it comes down is what really matters.

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01-01-2011 02:18 AM  7 years agoPost 7
Frank Bostwick

rrElite Veteran

Cincinnati Ohio

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When you say "set at 82" what do you mean? On my DX7 when I ran a 401, my gain setting on the gear ATV chnl was like 59-65. I sure would look into any binding in the tail system and push rod. Check (by offering resistance with your fingers) the servo to see that it has power, moving in both directions. IMO Id get a used GY401 for like $60. Its a known great gyro. Actually a 401, miniG, spartan are all good gyros and with the FBL train at full steam these days, good used gyros are a great buy. Good electronics make the most out of any air frame. Not to mention they can go in your next A/F.
My best guess on the info given is bad servo or servo gears.

RIP ROMAN

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01-01-2011 03:01 AM  7 years agoPost 8
RCHSF

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NC

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If your servo is binding like you said, just loosen the clamp on the tail boom and move the servo forward or backwards and adjusting your servo horn to be 90 at mid stick on rudder, will remove the binding. Also it all depends on the length of the servo horn itself. I think useing a 4-horn arm with three cut off, and have your ball placement aprox 4.5 mm from ball end to the center screw on the horn, will get it closeer to right. Not sure if you have all thing done already.

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01-01-2011 03:17 AM  7 years agoPost 9
birdsofpray

rrNovice

Lake Villa IL

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Your awesome I think you nailed it FBoss with the binding, since I cant set travel limit with this gyro the servo don't take much input on controls to get servo to travel all the way to the tail assembly so when I tried to do the quick spin I pushed the stick to far so when it hit the tail assembly it binds and probably confused the gyro or something. I need travel adjust so when applying full rudder it shouldn't hit tail assembly but no way to achieve this with this gyro"no pot on gyro for travel adjust" is there another way to do this through the radio with travel adjust for rudder or will this cause another issue that I don't want? I will be taking your advice with the replacement of gyro but trying to learn as I go. Thanks again.

What goes up must come down, It's how hard and painfully it comes down is what really matters.

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01-01-2011 03:21 AM  7 years agoPost 10
birdsofpray

rrNovice

Lake Villa IL

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Rcflyer_09 I did not try moving the ball link closer to the servo yet but its only one hole out now looks really close, going to try that now thanks.

What goes up must come down, It's how hard and painfully it comes down is what really matters.

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