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e-Mikado Logo 400 500 600 > Newest Vstabi Sensors/System. Notice on TR direction throws! **
 
 
OICU812
rrProfessor
Location: Grande Prairie, Alberta, Canada

I have found on the newest Vstabi units that the TR Travel in Direction A is limited. Limited meaning if you go past value of 64 on direction A, all tail hold will be lost. This in most cases should never be an issue, but be certain to check that you do not exceed this value, you can test this for yourself by unhooking tr rod etc and put value over 64, you will see that you can easily move the tr grips and blades with no force, this is not a good thing to experience or learn in flight as I had to. I have been told this change in software has something to do with many of the new servos on the market, something to do with resolution etc.

I should clarify, this was found using a Futaba BL251, not sure if it would be same % on others, but please do check by simply seeing if you can force the blades, grips back on your full deflection, again you can undo your rod to test to see what % your specific tr servo will goto before going into this blackhole zone.

Something to be aware of however imho!

...Once upon a time there were Nitros, flybars and frequency pins...
11-16-2008 07:28 AM
 
 
abrajim
Senior Heliman
Location: bogota colombia

yes i noticed that when i setup my 400, i still whonder why they do it and why theres no warnings in the user manual, also i think for a moment that it was an isolated problem to my unit , this is a realif see that it's a normal feature

sorry for my english
11-16-2008 07:38 AM
 
 
laughingstill
Elite Veteran
Location: Gainesville, Fl, USA

So is this a problem only with the plastic Vbar units?

3DMP-E, Logo 6003D, Logo103D Carbon and Trex 450se Flyin Firefighter
11-16-2008 11:47 AM
 
 
OICU812
rrProfessor
Location: Grande Prairie, Alberta, Canada

Yes the newest plastic ones. As stated I am not certain what the limit will be with other servos, hence reason to check with your paticular servo, if you stay below the limit which again is easily found you are perfectly golden. I tried to see this on the Aluminum versions I have and was unable to produce this limit restriction on Direction A.

...Once upon a time there were Nitros, flybars and frequency pins...
11-16-2008 12:10 PM
 
 
Blackrat
Senior Heliman
Location: Peterborough UK

I had the same problem on the old system, we thought it was down to a dodgy servo... after replacing the 9254 with a 8700g the problem went away

to clarify , when you give full rudder input (i think its was right ?), the servo moves to its limit and then it feels like the gears disengaged so you can move the servo horn by hand .. but the moment you bring the rudder stick in the servo comes alive again and works as normal ... right ?
11-16-2008 03:00 PM
 
 
OICU812
rrProfessor
Location: Grande Prairie, Alberta, Canada

For me direction A was towards the tr hub, but this of course depends on what you have reversed etc...Best to check both ways for sure. That is the feel or observation I had as you did as well yes.

...Once upon a time there were Nitros, flybars and frequency pins...
11-16-2008 09:38 PM
 
 
MIKADO
Heliman
Location: Potsdam, Germany

What is described here can happen when tail rotor travel is not symmetric. In this case the tail rotor servo can reach its mechanical limit, and it will shut off. We’ve seen this when pilots switch from a previous to another version of the VBar and setup the travel only in the software, but they do not test the mechanical limitations of the servo. This is not a problem of the VBar itself, but a problem of setting up properly. Would this make sense for this case?

Ralf Buxnowitz
MIKADO
11-18-2008 10:27 AM
HOMEPAGE  
 
 
TOSH
Elite Veteran
Location: UK.

So am l right in thinking the fix is to see what limits we can get then back off a couple and use a longer servo arm to get full pitch on the tail blades?

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11-18-2008 12:04 PM
 
 
firechicken
Heliman
Location: ma

Pretty much… just use a longer servo arm in order to not exceed the mechanical limit of the servo.
11-18-2008 01:28 PM
 
 
OICU812
rrProfessor
Location: Grande Prairie, Alberta, Canada

Ralph yes that certainly plays a part, it has been identified though that several newer 251 futaba servos somehow have a different firmware, thus creating a seen limit of throw.

...Once upon a time there were Nitros, flybars and frequency pins...
11-18-2008 05:48 PM
 
 
LouInSD
Veteran
Location: San Diego CA USA

I had the same problem in setting up my tail on my Logo 600 with a Logictech 6100 servo. A setting of 60 on Dir A seemed to be the threshold to make the thing let go...59 or less and the servo stayed engaged.

Glad I found this thread before I had real problems...
11-29-2008 07:28 AM
 
 
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e-Mikado Logo 400 500 600 > Newest Vstabi Sensors/System. Notice on TR direction throws! **
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