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Raptor E720 › Gyro gains on your E720
10-29-2013 12:15 AM  5 years agoPost 1
SSerrand

rrNovice

Powder Springs, Ga United States

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Ok so I've maidened my E720 and the first flight the tail was terrible. It wouldn't hold at all. I had it up at 85 and lowered it slowly now its at 69 and it holds but in a hover it bobs from side to side and in a tail down funnel you can hear it shake, but it wont let go. So I was wondering what your gains are for your E720.

Heres my setup:
Radio/Receiver: Futaba 8FG/6303SB
Gyro: Silverline Vbar 5.3 Pro
Motor: Scorpion HKIII-4530-540kv
ESC: Castle Edge 160HV
Cyclic Servos: Protek 350T
Tail Servo: Protek 250S
Blades: Rail 716 mains/ 116 tails

Note: I have not tacked the headspeed on the heli as I am not running it in governed mode yet. I know that idle 1 is a low headspeed probably around 1750-1800 idle 2 is probably around 1950. Again thats just from the sound of the blades.

Stephen Serrand

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11-12-2013 12:21 AM  5 years agoPost 2
SSerrand

rrNovice

Powder Springs, Ga United States

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Update
I lowered the gain to 65 and took it up and at first it seemed fine I noticed a slight kick to the side when I was being very hard on the collective. Overall though it was fine, when I went up for a second flight I flew for maybe 2 minutes and all of a sudden the heli rotated clockwise about 45 degrees. It wasn't pilot error because at the time I was coming out of a four point flip so I was only using elevator. I had this happen once before but it was counter-clockwise. So now I am at a serious loss and I cannot think of what could be causing it. Anyone have any suggestions.

Stephen Serrand

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11-12-2013 02:25 PM  5 years agoPost 3
gwright

rrVeteran

Champaign Il

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I've seen this before with a bad tail servo,.. a couple times actually. I'm not saying that's the issue but it's the first place I'd start. both of my instances were using quite "seasoned" electronics though. (I'm cheap and tend to use servos for years till they quit)

Gary Wright

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11-12-2013 04:51 PM  5 years agoPost 4
SSerrand

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Powder Springs, Ga United States

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The servo is brand new and it is set on the right pulse and frequency setting so I don't think that's it but I will keep an eye out cause it is a possibility.

Stephen Serrand

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11-12-2013 07:10 PM  5 years agoPost 5
raildog

rrApprentice

albuquerque nm

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Check tail bearings in the blade grips make sure everything is seated correct.

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11-12-2013 08:40 PM  5 years agoPost 6
gwright

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Champaign Il

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Ditto on raildog's comment. A thrust bearing installed backwards does strange things. I've NEVER done that,.....any more than a half a dozen times <G>

Gary Wright

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11-13-2013 03:55 AM  5 years agoPost 7
SSerrand

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Powder Springs, Ga United States

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Ill definitely give that a check so far I haven't done that yet in any of my other heli's but were human so anything is possible.

Stephen Serrand

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11-13-2013 05:18 PM  5 years agoPost 8
john2kx

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Augusta, Ga

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I have had only one tail issue with my 720e. It happened when the main shaft was able to move up/down causing the main gear to make contact with tail linkage.

Repositioning the shaft collar and some fresh locktite took care of my issue.

May also try popping tail linkage at servo and ensuring no binding from servo back to slider.

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11-13-2013 06:06 PM  5 years agoPost 9
SSerrand

rrNovice

Powder Springs, Ga United States

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Just checked the thrust bearings and they were in correctly I haven't noticed any binding but I haven't looked that hard ill check that next.

Stephen Serrand

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11-14-2013 06:48 PM  5 years agoPost 10
chicagoslick

rrApprentice

Indiana, USA

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I noticed something peculiar about my tail assembly. The blade grips have about 3mm of play in relation to the tail rotor hub. I have disassembled 3 times and it is put together correctly according to the directions. This does not seem right. S Serrand do you have this same issue? Does anyone else have this issue?

This information is on pg 22 of the manual.

gary

Chicagoslick

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11-14-2013 09:00 PM  5 years agoPost 11
Adam Landefeld

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Lehi, UT, USA

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That in and out movement is quite normal. When rotating, the grips seat out against the thrust bearings and are perfectly supported. No need to worry about that. You can check for lateral play by pulling the grips apart from each other, out against the thrust bearings and then rocking side to side on them. This tail assembly is butter smooth.

Hope that helps,
-Adam

Futaba Factory Team
Team FlightPower
Thunder Tiger

https://www.facebook.com/UtahHeli

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11-14-2013 09:44 PM  5 years agoPost 12
john2kx

rrNovice

Augusta, Ga

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As Adam stated, what you described is normal.

Did you check main shaft for up/down movement?

Pop ball link at tail servo and check for smooth operation by hand?

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11-15-2013 04:24 AM  5 years agoPost 13
SSerrand

rrNovice

Powder Springs, Ga United States

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What adam said is correct I had the same worry when I was building it as im used to never having play anywhere so I did some research and found that to be expected. After thinking about it for a bit it made sense and I realized how nice of a design this heli is. Today I popped the linkage off and it was smooth as silk. So I decided to violate my poor poor E5 and steal its tail servo as that is the last thing I can think of. Things are already looking up as in setting it up the numbers for the end points on vbar were almost spot on with the original servo I had they were at 80. Unfortunatly I will not have an opportunity to fly it till either saturday during work or monday. So I will let you know if that fixes the problem as soon as I know.

Stephen Serrand

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11-15-2013 04:24 AM  5 years agoPost 14
SSerrand

rrNovice

Powder Springs, Ga United States

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Oh and john the mainshaft has no play in it.

Stephen Serrand

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11-15-2013 06:02 PM  5 years agoPost 15
hobby_man

rrNovice

MPLS, MN

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Ah ha. My grips move in and out from the hub as well. Good to read this is normal. They do spring out when not spinning. Looks like the black plastic links provide this.

Very diff. Than my align 700e

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11-18-2013 04:17 PM  5 years agoPost 16
chicagoslick

rrApprentice

Indiana, USA

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Thanks for everyones follow up posts.

I do not necessarily agree with this setup, but I am willing to concede to everyones success with it....

Chicagoslick

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11-20-2013 03:19 AM  5 years agoPost 17
SSerrand

rrNovice

Powder Springs, Ga United States

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So finally got the opportunity to take the e720 up with a bls 256hv servo in it and that was definitely the issue. At 80% on the tail gain and the limits in the vbar at 106 (where with the other servo they were at 80 in either direction) It flew phenomenally no issue with the tail even doing an entire minute of tail down funnels as well as no shaking coming from the tail. I already called amainhobbies and they are going to replace the servo, but I'm going to leave the bls256 in it and just get another servo for my E5. Thanks for all your help guys and look forward to maybe flying with some of you one of these days.

Stephen Serrand

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11-20-2013 12:29 PM  5 years agoPost 18
chicagoslick

rrApprentice

Indiana, USA

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S Serrand will you post some pics of your completed heli with gear installed...Trying to get an idea of other peoples installs...Great post by the way...

thanks,

Gary

Chicagoslick

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