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Home✈️Aircraft🚁Helicoptere-Hirobo Embla - SRB Quark - Lepton › Tail servi bracket flex on Embla
11-21-2016 05:40 PM  3 years ago
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Jamovich

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Maryland, USA

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Tail servi bracket flex on Embla
hi guys

Is this normal on an EMBLA?

Watch at YouTube

The flex is pronounced even with slight tail movements.....

Don't see how this can easily be fixed if this is not normal

Thanks
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11-21-2016 05:50 PM  3 years ago
JuanRodriguez

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The servo is overdriving the tail range and that is why you see the whole bracket flexing....

The issue is not Embla specific as it will happen with any brand. You need to fix it by adjusting your endpoints.....How will depend on your FBL. For example, my 3GX controller has a tail rotor end point adjustment which is part of the overall controller setup.......

An alternative way would be to place your ball closer to center on your servo horn thereby reducing the throw...

Without more info on your part such as type of FBL controller you have, etc, it's hard to give any further advice.....
Been there, done that and old enough to know better.....
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11-21-2016 08:26 PM  3 years ago
Santiago P

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I noticed that after my last PM with Jamovich.

You can reduce the travel on the BD to avoid over driving.

Having said that, the plate is flexing when the servo arm moved only partially, which will make me suspect the bracket may be cracked.

Santiago
Team Minicopter - PeakAircraft.com
FUTABA.USA - Team Kontronik - Scorpion Motors-
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11-21-2016 09:34 PM  3 years ago
Four Stroker

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Atlanta

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Take the arm off of the servo and see how hard the rod is to push and pull ! Looks like binding to me.
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11-27-2016 04:44 PM  3 years ago
Jamovich

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Nvm
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11-27-2016 09:49 PM  3 years ago
JuanRodriguez

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What do you mean "never mind " ??? If you found what the issue was please post it as it may benefit others down the line !Been there, done that and old enough to know better.....
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11-28-2016 02:15 AM  3 years ago
Jamovich

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No I have not yet found out what the problem is. I fixed the tail binding issue (reduced the travel in the 3SX software)...the bracket still flexes but much less. When I fly FFF and I give left rudder input the tail does not respond.

Either it is the plastic tail blades flex too much causing overpitch or I must reduce the travel
further in the software. As I don't have a windows laptop handy it will take a few trips between the field and home to sort this out which is a real pain in the ass
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11-28-2016 09:57 AM  3 years ago
Mike0251

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I will check mine out tonight when I get home from work. For what it is worth I have my servo mounted against the other side (back side) of that carbon bracket.
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11-28-2016 11:34 AM  3 years ago
Jamovich

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Ok thanks...please do send me a pic of how you have mounted your servo as I can't visualize what you said. I'm using a bls 257 as a tail servo
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11-28-2016 10:31 PM  3 years ago
Mike0251

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Ok now that it's not 4:15 am in the morning. We both have our servo's mounted the same. My eyes were not open enough.

Next, my servo travel is approximately from 11 to 1 o'clock. 11 is pushing it near the end of travel for me (fwd movement) as I can just see a tiny tiny start of flex. I use a 9257 and the distance from center to clevis is .33" or 8.38mm with a standard Futaba round wheel.

Your travel is a bit more than mine and at the end of the throws I see your bracket flex. Not in the center range. I can also tell this by the amount of blade pitch I see too. I do not have that much. Back off your throws some more and I bet the flex goes away. Granted you won't have as much blade pitch but I bet it will still do what you want easily.

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11-29-2016 04:18 AM  3 years ago
KevinB

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Earth

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Normally with a heli I usually find I have enough left pitch but border line enough right. With the Embla I found the opposite. I found the Embla simply didn't have enough pitch slider movement towards the tail hub to do a traveling left pirouette with any kind of forward speed. What I ended up doing on all 3 of my Embla helis was to file down the inner side of the tail hub. This allowed more outward slider travel and sufficient left tail pitch to get the control I wanted. I also never ran the stock tail blades. Carbon blades worked much better.

Just FYI.

KevinB
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11-29-2016 04:39 AM  3 years ago
Jamovich

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interesting...you are saying that there is not enough left travel movement, and some people suggest that the blade is over-pitching....

If indeed one has to file the tail hub for it to fly correctly then hirobo as some serious design quality issues...

...just examined the hub...there is no plastic to file down on it...the hub has a bearing/sleeve exposed on both sides..travel to both sides seems similar to my other helis...so what did you actually file down?
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11-29-2016 09:56 AM  3 years ago
Mike0251

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I would decrease the throws first and fly it before filing away. The Embla is a strange creature...not quite in the full blown Hirobo family. A bastard child if you will.
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11-29-2016 10:52 AM  3 years ago
Jamovich

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ok...Ill wait for my carbon tail blades and reduce the throw...

I think hirobo should not experiment with Chinese made stuff in the future...this heli does not meet the quality mark as the other helis in the hirobo line.

I don't mind paying for quality.
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11-29-2016 12:38 PM  3 years ago
KevinB

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Just to clarify...

For stationary piros, it was fine as it came. The problem appeared when you attempted traveling left piros. It did not have enough left pitch to give a consistent piro against the slipstream of of air caused by the forward flight. The piro would stall at a 1/4 turn until the forward speed decreased to almost nothing.

Also, I mean file the tail HUB. Not the grips. (see pic below) The filing creates a flat that the metal on the pitch plate comes up against. After doing it you get almost equal pitch both ways.

To get enough tail pitch to handle a traveling piro, you likely have enough pitch to get a blade stall in a hover. It's a trade off.

I have the tails on my Emblas working very well in all the flight conditions I put them in. So, this worked for me. No guarantees.

KevinB

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12-11-2016 07:22 AM  3 years ago
Jamovich

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Solved the problem. CF tailblades fixed it
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12-11-2016 10:57 AM  3 years ago
Jamovich

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Update. Unfortunately not solved. Reduce the travel of the tail blades?
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12-11-2016 12:01 PM  3 years ago
Mike0251

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I would decrease the throws first and fly it before filing away.
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12-18-2016 04:20 PM  3 years ago
Jamovich

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Actually the problem is now fixed. I had to increase the throws to max (but before any binding occurs).

The problem was always the plastic tail blades
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