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Home✈️Aircraft🚁HelicopterHIROBOHirobo SDX › SDX washout pins disconnecting
09-18-2009 02:35 AM  11 years ago
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Wyorcflyer

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Cheyenne, Wyoming USA

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SDX washout pins disconnecting
Has Hirobo tried to fix one thing and caused an unintended problem?

I broke the washout arms so I ordered the parts in the manual but forgot to check the addendum sheet so I ordered the washout and radius arms separately (0403-085 & 0414-467). Once I got them it was obvious that the washout arm number in the manual is wrong, the addendum I missed is correct. I therefore reordered the whole washout arm unit 0412-111 which has the washout arms and the radius arms.

I installed the new arm/radius arm and found that if the swash is sitting on the bottom of the mast, which it does when the radio is off, the washout pins drop below the head block and disconnect??

They didn’t do that before!

The first picture is the swash at its lowest with the radio on and full negative. No problem. The second is with the radio off and the swash sitting on the bottom. You can see that the pins are disconnected.

It turns out the radius arm links on the new combined unit are much shorter than the original 0414-467 radius arms. I presume that was to solve the interference issue noted on page 24 of my manual. The result is that it pulls the washout base and pins down much farther and allows it to disconnect. I note with some interest that the shorter radius arms do not say Hirobo on them.

This is more than a nuisance. If you forget to manually raise the swash and reconnect the pins and turn the radio on, or don’t know like me the first time, the pins won’t line up with the head slots. It drives the pins right down through the swash base. Not good.

So after all that the question is has anyone come up with a way to use the new setup and keep the pins from disconnecting? Should we go back to the longer radius arms? Is it just an error in my package and they put the wrong radius arms in the package?

jack
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09-18-2009 03:11 AM  11 years ago
doorman

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Sherwood, Arkansas

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Pin Fix
I tapped the pins up from the bottom approx 3/16"
Then a drop of green locktite in each hole and a set screw into the new hole so the pins cannot be driven back down any longer...
No more problem!!!
Stan
AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft
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09-18-2009 03:52 AM  11 years ago
Wyorcflyer

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Cheyenne, Wyoming USA

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doorman
Good tip. I am not sure 3/16ths will do it but I will take a look.

Also on mine if I raise the guide pins any more I think they will hit the head block above the guide holes at full positive pitch.

jack
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09-18-2009 03:55 AM  11 years ago
Wyorcflyer

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Cheyenne, Wyoming USA

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main shaft holes
BTW I did check to make sure I am using the correct hole on the bottom of the main shaft. If you use the incorrect, lower hole, it would make the head sit too high.

I believe the top hole and the correct bottom hole are at 90 degrees to one another and the wrong bottom hole is parallel to the top hole. Is that correct?

jack
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09-18-2009 01:05 PM  11 years ago
Leif

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USA

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believe the top hole and the correct bottom hole are at 90 degrees to one another and the wrong bottom hole is parallel to the top hole. Is that correct?
Yes, that's correct. The Evo 50 uses the lower hole, but the SDX uses the upper one. Your J-bolts should be at 90 degrees to each-other.

Leif
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09-18-2009 01:25 PM  11 years ago
doorman

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Sherwood, Arkansas

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Pins Hitting....
I did find the same thing and just did a little relief notch with a dremel tool on the head block....now I have full travel in both directions and they will not come out of the block, which can be fun to fly!!! (Ask me how I found that one out!!!!)

Good Luck, Stan
AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft
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09-18-2009 02:32 PM  11 years ago
Against Gravity

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Pottstown PA

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Low Pins
My SDX has done this since new, 135% Swash and factory settings. I learned to double check pin alignment before power up.
One time I forgot and it snapped my washout arms off instead of pushing the pins down.
Happened before first flight, lost a days flying...

Glad you brought this up I had forgot about it.

PS. I bought the new alum upgrade washout block, had a mild crash with it, did not even pop a link off.
After inspection both washout pins were bent. need to find a source for just the pins.
Any one have any extras laying around ??
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09-18-2009 02:50 PM  11 years ago
doorman

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Sherwood, Arkansas

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Pins....
Can you take the ones out of your original block and just install them with a touch of good old GREEN loctite????

I did the same thing, forgetting about this mod....

I took off and was flying along and noticed the heli did a little pitch to the left that I had not given it... I throttled back and landed to find the pins against the corners of the head block, and the timing on the controls was a BIT off!!!! Not sure how long they would have lasted flying, but I was able to land safely and that is when I came up with the remedy... I fly too many types of machines to remember to see if they line up when I turn the unit on, so I had to do something.....

Good Luck, Stan
AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft
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09-18-2009 03:37 PM  11 years ago
S76 Mech

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Hatboro, Pa.

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need to find a source for just the pins.
Any one have any extras laying around ??
If the stock plastic washout pins are the same, I have some spare pins. I can give em to you on Sunday.
Gaui Greatness X7, X5, NX4, X3
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09-18-2009 04:30 PM  11 years ago
MRC-Hirobo

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Edison, NJ

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My helicopter is the same. If the helcopter is turned off and O put the swash all the way down, the pins will come out of the block a few MMs. When the helicopter is on it is impossable for the pins to come out. I dont think this is a problum you just have to quick look to make sure the pins a in when you turn on your helicopter.MRC Host
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09-18-2009 05:16 PM  11 years ago
Wyorcflyer

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Cheyenne, Wyoming USA

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Stan
I agree this is not a tolerable situation it is a problem. Having to manually reconnect the pins to the groves before you turn on the heli is not acceptable. Failure to remember means something bad is going to happen to the heli. That is not an acceptable design.

Greg:

Hirobo needs to address this issue!

jack
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09-18-2009 05:39 PM  11 years ago
S76 Mech

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Hatboro, Pa.

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Preflight checks ...Gaui Greatness X7, X5, NX4, X3
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09-18-2009 06:22 PM  11 years ago
MRC-Hirobo

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Edison, NJ

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Every time you fly your helicopter you must take note of all of the moving parts. It is something basic that all pilots should do. Check your swash by visually looking at the swash movement and the pins. Check your tail to make sure the blade grips are screwed into the hub and the tail movement. Check you main mast to see if there is play between the auto hub and the mast lock. Check your head to see if there are cracks or loose bolts. Everyone should be doing all of this no matter what brand you fly.

The pins could slide out if the helicopter is powered down. I would not say it is a “problem” or a design flaw. The helicopter is one of the best 50s ever made. Granted Hirobo could have made the pins longer and put groves into the block. I don't know how Hirobo would address this.
MRC Host
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09-18-2009 06:41 PM  11 years ago
Wyorcflyer

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Cheyenne, Wyoming USA

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MRC-Hirobo
Greg:

I agree the SDX is one of, if not, the best 50 out there. That is what makes this particularly odd. I own or have owned most of them and the SDX is my favorite.

That said I have never had a heli that had this issue. Can anyone name another heli that has the swash pins disconnect at rest? Then if not manually reconnected before power up upon power up it damages the heli?

Sure preflight is critical and I conduct detailed pre and post flight inspections.

We will have to respecfully disagree as to whether this is a design issue or simply a matter to be put on the preflight checklist.

jack
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09-18-2009 06:58 PM  11 years ago
MRC-Hirobo

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Edison, NJ

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Jack,
I understand what you are saying. I will be more than happy to mention this to Hirobo. My only fear is that they will tell me what I told you. Is it sonething you have to look our for? YES. Is it an easy fix when you take the second to look at it? YES.
I will wait to see what Japan says. Thanks for bringing it to my attention.
MRC Host
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09-18-2009 07:12 PM  11 years ago
Wyorcflyer

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Cheyenne, Wyoming USA

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greg
We appreciate your continued support for this wonderful heli.

Jack
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09-18-2009 07:33 PM  11 years ago
Dr.Ben

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Richmond, VA, USA

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Jack,

You had asked will another brand of heli do this. I can tell you unequivocally that MA's models will do it too.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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09-18-2009 07:37 PM  11 years ago
MRC-Hirobo

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Edison, NJ

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Anytime Jack, It is suggestions like yours that Hirobo uses to make better product. I guess its the RC circle of life.MRC Host
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09-18-2009 11:25 PM  11 years ago
Raptorz499

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NJ

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Well...I would rather check it everytime before flight and just fly everytime and not worry about loose ball links/worn balls...not mentioning other names! I LOVE my SDX
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09-19-2009 12:21 AM  11 years ago
TMoore

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Cookeville, TN

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Low Pins

My SDX has done this since new, 135% Swash and factory settings. I learned to double check pin alignment before power up.
One time I forgot and it snapped my washout arms off instead of pushing the pins down.
Happened before first flight, lost a days flying...

Glad you brought this up I had forgot about it.

PS. I bought the new alum upgrade washout block, had a mild crash with it, did not even pop a link off.
After inspection both washout pins were bent. need to find a source for just the pins.
Any one have any extras laying around ??
My swash never drops this low so I haven't had any issues. The swash would have to sit flush on the frames to have the pins come out of the had slots.

The pins are easy to make from .078" music wire.

TM
Part 107.
The only ZERO flight hour certificate in the world.
It's like getting a driver's license without the driver's test.
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Home✈️Aircraft🚁HelicopterHIROBOHirobo SDX › SDX washout pins disconnecting
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