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Home✈️Aircraft🚁HelicopterSynergy R/COther › Tail Rotor blade Grips Play
09-10-2006 03:06 PM  14 years ago
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Spookyeng

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Meridian, ID USA

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Tail Rotor blade Grips Play
I built my T/R Blade grips and bolted the to the hub. It seem that there is about 1.5 to 2mm play back and forth. I took everthing apart and rebuilt them and still the same thing. the only thing that was hard to get into the grips was the inner thrust bearing race, other than that everything was very simple I though. Is this normal? Both blade grips do it, so I assume there is nothing wrong with grips. Maybe when I get the rest assembled and connect the tail pitch slider the play will go away? Any inputs would be greatly appreciated. I am the question master this week, seems like I have endless question. Thanks
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09-10-2006 03:34 PM  14 years ago
wore-out-pilot

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Jeffersonville, Indiana USA

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spookyeng, There is no play in mine. Are you sure the thrust bearing with the loose fit is installed first in the tail grip. If you have trouble putting the thrust bearing into the tail grip use your x-acto knife with the blade removed. Once you get it lined up in the grip use the butt end of x-acto knife to slide the thrust bearing into the grip. The part of the thrust bearing with the tight fit is very tight and I used a little of fine 400 or 600 sand paper to smooth out the inside of that part of bearing to get a smooth fit. Hope that helps.MAKE-IT-HOT They call me aka the hammer
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09-10-2006 04:27 PM  14 years ago
Spookyeng

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I had to sand the inside of the outer race also, very tight. I did check everything twice. I will take it apart again and see, but I am very confident that I did put the loose fit inner race in first. When I look down into the blade grip at the bolt there is a small gap the entire way around the outer race. Thanks for the input.
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09-10-2006 04:36 PM  14 years ago
heliman

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Fullerton, CA

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I noticed play in the blade grips when I inspected the heli at the Los Angeles FF.
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09-10-2006 04:58 PM  14 years ago
Spookyeng

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I just got done rechecking everything and it is installed right. I ensured that the inner race in all the way flush against the inner blade grip and everything is in the correct order. Once I installed it on the T/R output shaft with the pitch slider it firmed up a little but there is still play. Seems like it needs another bearing before or after the thrust bearing, kinda like the main blade grips. I am sure it will be OK but not ideal.

Heliman, Thanks for the info from the LAFF
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09-10-2006 05:31 PM  14 years ago
thenewguy

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Corvallis, Oregon Where there is liquid sunshine!

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Mine has the same amount of play in the grips. I'm not sure if this is correct or not. It did not make any difference flying. Plus when the tail is spinning that fast, I don't see how it can have an affect.
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09-10-2006 06:34 PM  14 years ago
Spookyeng

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Thanks for the info guys
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09-10-2006 07:27 PM  14 years ago
DOKEY

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Northamptonshire UK

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I have no play if I push and pull on the ends on the blade grips, but I do have the side to side play.Ryan.
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09-10-2006 07:44 PM  14 years ago
vitek

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Corvallis, OR

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You should have zero end play, but it is totally normal to have a little side-to-side play.
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09-10-2006 11:12 PM  14 years ago
inkspot1967

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Cranston Ri

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yup its normal play mine is same a little bit of side play
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09-11-2006 12:06 AM  14 years ago
Droid

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Deep down in the Southwest- UK

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I would be more concerned about the play in the pitch slider to bellcrank link!Quotes may have been changed for my own amusement
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09-11-2006 12:25 AM  14 years ago
bathmagic

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Berwick,Victoria, Australia

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grips
funny i was looking at mine last night and one of mins has play and the other doesnt !
i pulled them apart thinking i had mixed up the inner and outer race on the bearing and i had them right.
so what do i do ???

Dale
ENV - Still laying it down !….Ohhh yeh !!!
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09-11-2006 12:39 AM  14 years ago
hansking12

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irvine, ca

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bath, fly it
mine has one side more axial end play than the other. no problems.

hth

hans
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09-11-2006 12:49 AM  14 years ago
Droid

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Deep down in the Southwest- UK

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I'm sure your gyro and servo wouldn't agree ,they are probably glad when the flight is over!Quotes may have been changed for my own amusement
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09-11-2006 01:00 AM  14 years ago
cricket

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scottsdale az

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There was one at the field that was being set up. A small amount of play in one blade grip. Removed the grip and seated the bolt in the hub. The bolt needed to go a little bit deeper. Worked the threads a little bit back and forth and the bolt seated deeper. Reinstall the grip and no slop.

My Synergy has been great no slop and it flys great. The only issue has been a very small amount of play in the tail bellcrank but it is about the same as my other 90 machines.

John
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09-11-2006 01:08 AM  14 years ago
Droid

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So you are one of the lucky ones with the plated balls then?Quotes may have been changed for my own amusement
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09-11-2006 01:27 AM  14 years ago
cricket

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scottsdale az

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Balls are not plated on mine. There is one of the first proto-type birds flying at the field and it does not have plated balls either. The proto-type bird is at least 1 1/2 years old and it is still very tight I checked it this morning before the first flight.

John
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09-11-2006 03:39 AM  14 years ago
hansking12

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irvine, ca

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play
droid, why are you derailing the topic into your plated balls issue which has been hammered to death now time and again? can we keep this on topic, which was play in the tail blade grips.

as you replied to my statement when one end tail grip has maybe .5mm more endplay than the other. please, explain to me in engineering terms why it would cause the gyro and servo any additional load. now, check my profile, don't b.s. me. get it?

really, when you have a system like this loaded mainly due to centripital acceleration to the tune of approx 8k rpm, the loads on the tail hub are predominantly outwards. there will be variable torques and forces (none of which contain a significant radial component to overcome the acceleration forces due to the blade/grip unit spinning) upon the tail hub ends, however, required to translate/hold the tail back and forth. the situation never occurs (when we fly) whereby this axial end play will ever cause any problem, so long as the grips are equally outwardly located in their circular translational path.

i don't like to hammer people, but really, some of you just have to get out and fly these toy helicopters more often. the heli flies fine for me and everyone i know who has one or more. those who say they can feel and appreciate the differences in taking out the ball link play must be on or beyond the level of todd, jason, matt, nigel, bob, etc. if so, please let us know who you are--perhaps you should give those guys tips to tighten up the feel of their helis.

hans
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09-11-2006 06:57 AM  14 years ago
Helinutnz

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below 42 South

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hansking12 talks sense. Evo 50 has same sort of play in tail. No effect. Centripetal forces take care of it when flying. My Freya tail was reworked from a bit loose to slop free to get rid of a tail buzz but probably all I did was to prevent the ability of the blades to flap a bit...dunno...but the result was no difference. The tail on the freya is slop free....the tail on the sceadu has slop....guess which one has a smoother tail? Sceadu. I have changed everything.....so I don't believe a small amount of slop here will affect anything including the tail servo. Also the tail is loaded positively most of the time to counter torque so slider slop is not too much of an issue.

For all the guys that say the Synergy flies great....locked in and smooth.....I am sure those guys like hansking12 have the same set ups and a bit of slop here and there but it doesn't seem to affect them?
Wonder why? Maybe flying ability....not saying it is.....just a thought
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09-11-2006 12:48 PM  14 years ago
Spookyeng

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Meridian, ID USA

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Hansking12,

Thanks for the information on the Tail Rotor, very well put! I am not that worried about it but I did have to ask, I tend to have alot of question. I just wish I had a mainshaft so I could fly it! Take it easy
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