Tail kick on 500 pro

[NC Hillbilly]

I just set my pro up with the governor on the talon 90 and now have a tail kick at full collective +/- . I had it set up before with the stock 12 tooth pinion with the 134 main gear, had pitch curves set with 13+/13- and had to set the revo on the ar7200 to low reverse to remove the kick. Now I am running the lynx 14 tooth pinion and have my gov set to N 30%=2400, I/U 1 70%= 2800 and I/U 2 100%= 3100 and bumped my revo to high reverse and still have tail kick. What gives? Do I need to lower my gov gains more? It seems to be good with steady head rpm.

[Digger1973]

Same thing I am working to resolve on mine but using a sk540 gov set at 3100. Running lynxx 14t on 134t main. I am hoping to get to play a bit tomorrow with it. I disabled my gov in tail bank 2 and got the tail steady in a hover first. Now with full collective I get tail kick with 11deg of pitch. Never had it before with 15t on 162t main. I did notice all my gains had to drop since replacing all the bearings and I used to run 20% on gov gain but am slowly dropping it each flight to get the kick out as well as adjusting my coll/tail mix in my sk540.

Heres to us resolving it on 2 different fbl units

[NC Hillbilly]

I am currently at 16% on the gov gain now and will lower it a bit more tomorrow. Maybe we will get it figured out. Here's to us


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[Digger1973]

Lowered gov gain all the way dow to 10 (lowest it goes). It barely starts to bog. Adjusted my tail/collective mix up to 60. Increased my start acceleration on the tail and lowered the stop speed. All that helped a bit on the tail kicking. This is on my sk540.

Edit:

Check your bearings in the tail blade grips.. checking mine tonight. Georgi suggested tgem in the sk forum and I forgot to replace mine when I did the rest.

[Digger1973]

Found 2 bearings bad. Replaced all radial bearings. I also found a pitch link wasn't moving freely. Fixed that. Waiting on a new dfc link so I can test it. Found one was starting more crack.

[NC Hillbilly]

I ran 4 packs thru mine today while adjusting the tail rod and my gains. I readjusted my tail rod to eliminate drift during hover with the gyro set to rate mode, then adjusted my gyro gain up. I then tried fast full collective pitch pumps and still get a kick but not as bad. I also lowered my governor gains a couple of points but still have a ways to go. What gets me is I had a very slight kick before and got it adjusted out with low revomix but now the high will not take care of it. I will pull the tail apart and give the bearings a check also.

[NC Hillbilly]

After some digging I found the ball link on the rudder servo binding. Didn't have any extras and the shops near me didn't either, got some spare parts on the way from A Main. Just will be down a few days before I can resume testing / adjusting. Will have to play with the 450 for a while.

[Digger1973]

Same as me then. Waiting on a part to test. Not sure if my link will show up before my synergy e5 stretch or not. Fyi a synergy e5 set up with 2 3300mah packs(500 packs) for 12 cell is one powerful 550. Approx 50 bucks more to make it a 600

[NC Hillbilly]

Originally Posted by Digger1973

Same as me then. Waiting on a part to test. Not sure if my link will show up before my synergy e5 stretch or not. Fyi a synergy e5 set up with 2 3300mah packs(500 packs) for 12 cell is one powerful 550. Approx 50 bucks more to make it a 600

I really like the looks of the Synergy and will probably be my next purchase when the funds allow. I do want to step up in size as soon as possible.

[Digger1973]

I wanted quality and something that would share my 500 packs. Got tired of waiting to see what alees brings out so I went with synergy

[vtown nick]

Are you guys still on the stock tail servo?

Rate mode setup in my findings helps a lot with the smaller helis fighting a tail kick. Stock align servos aren't usually strong enough for hard maneuvers. My 500 tail worked great all stock until I would do backwards inverted right rudder, it would lock up or blow out. No issues and no fine tuning has been needed with the bk servo I picked up. It's a beast!

[Digger1973]

The kick we are talking about if fbl unit related to hard pitch change compensation. I am almost positive I found the issue in mine. Just need a new dfc ball link for my dfc arm so I can test. For me a pitch link was tight from slider to grip and 2 bearings were bad. The sk units really show anything binding on the tail . Since it wasn't there before I new something changed mechanically.

[NC Hillbilly]

I am using the stock servo with mine, but did find my ball link binding on the ball on the rudder servo horn. I had a slight kick before the gov setup but was able to completely remove it with the revo mix in the ar7200bx. But after the pinion change and gov settings I cannot get it out on full collective pitch climb outs .


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[Digger1973]

I really think mine will be resolved with freeing up the pitch link

[vtown nick]

Ok that makes more sense to me then, start off with the known obvious first then. You talking the DFC tail then?

[NC Hillbilly]

My setup is with the dfc tail gearing.


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[Digger1973]

Yup. 500pro dfc

[NC Hillbilly]

I got my new links and moved my ball in to 8mm and still have the kick. I adjusted the gyro gain to the next up from red and have my tx gains set to 45 with the revo mix off. I guess I will add revo mix back and go from there. I am also going back up in the gov gain to make it hold head speed better.

[Digger1973]

Hoping to test mine tomorrow

[vtown nick]

Sorry I ment the dfc tail pitch links. I too have the lower gearing tail like you guys but run mine 100% flat throttle. Is it doing this in your idle 2 set at 3100 like in the first post? I think it's time for a better tail servo, stock 100% motor output on a 12t is roughly 3,000 rpms and if your running a gov of 3100 on a 14t chances are the gov is causing a lot more torque demand on the tail. Just my opinion tho.