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Revolution Models . CarbonXtreme . Midland Helicopters

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JR Heli Vibe - Airskipper - Sylphide - Venture > Throttle Servo Choice for Vibe 50
 
 
Pinecone
Key Veteran
Location: Maryalnd

What are you running on your Vibe 50?

I was thinking going micro, like HS-81, or maybe the new HS-5085 digital. Or the JR 3421.

How fast should it be?

Terry
Blade CP
Trex 450 SE
QJ EP8v2 EX
Gaui Hurricane 550
Vibe 50
07-01-2008 11:22 AM
 
 
tchavei
rrProfessor
Location: Portugal

anything between 0.12 and 0.16 is more than enough.

Personally I'm using a 3155 mini futaba because of weight and precision. I suppose you got get away with a micro HS85MG or something similar as long as you keep the vibrations away.

Tony


--------------------
"Perfection and patience usually walk side by side..."
07-01-2008 03:49 PM
HOMEPAGE  
 
 
Dynamite
Senior Heliman
Location: Odessa

I am using JR 811.

JR Vibe 90 , Sylphide 90 C , JR Vibe 50 , JR AS 50 , T-rex SE V2 , Raptor 50 Titan
07-01-2008 10:56 PM
 
 
Carbon Copter
Veteran
Location: USA

I know most might say over kill, but the JR manual does hint to use x 4 8717 servos.
07-02-2008 02:10 AM
 
 
tchavei
rrProfessor
Location: Portugal

obviously they're not going to suggest for you to use a $10 mini servo

Tony


--------------------
"Perfection and patience usually walk side by side..."
07-02-2008 02:13 AM
HOMEPAGE  
 
 
tussy
Senior Heliman
Location: Thailand

How about HITEC HS5245 MG
07-02-2008 02:29 AM
 
 
Mike Fortin
Veteran
Location: Orlando, Florida

I am using an HS-81 on 8 volts.

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Mike Fortin
07-02-2008 02:38 AM
 
 
aviation
Senior Heliman
Location: Quebec Canada

Throttle Servo

I am running the JR 8417. It seems to do the job very well


aviation
07-02-2008 03:07 AM
 
 
Mike Fortin
Veteran
Location: Orlando, Florida

The HS-81 is a great option if you are trying to save some weight and works every it as well as some of the heavier full size servos, plus it's only $12 bucks.

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Mike Fortin
07-02-2008 03:34 AM
 
 
3Dx
Key Veteran
Location: Monterrey NL Mexico!

Quote 
I am using an HS-81 on 8 volts.

WOW!!!!
07-02-2008 06:01 AM
 
 
reiserrob2003
Veteran
Location: Brockton, MA.

HS6965, plenty of speed plenty of power low cost
07-03-2008 04:46 AM
 
 
BlueGarry1
Veteran
Location: Romford, Essex, UK

I'm using JR8231's in my two Vibe 50's and they're very reliable.

Bluegarry1

JR Vibe 50 Just love it !!
07-03-2008 12:05 PM
 
 
Spacey
Senior Heliman
Location: Pretoria, South Africa

JR DS-385 on all my nitro helis on the throttle. Obviously I don't recommend it to anyone, but with proper care they work a treat, only one I've lost was right after the heli went in pretty bad so I can't say the servo is not up to the task. They are alot of work to install and ensure the vibrations etc won't kill them.
07-03-2008 12:19 PM
 
 
Pinecone
Key Veteran
Location: Maryalnd

So what do you do to use a sub-micro? I have several 285s sitting around.

Kind of leaning to a HS-81 converted to digital with an Ashtek board.

I see no reason to run a full sized servo to move the throttle and mixture.

Terry
Blade CP
Trex 450 SE
QJ EP8v2 EX
Gaui Hurricane 550
Vibe 50
07-03-2008 12:29 PM
 
 
Spacey
Senior Heliman
Location: Pretoria, South Africa

Nothing special really, usual stuff with just much more extra care on the setup.

Obviously you need to build a mounting plate for most if not all helis, a broken blade usually has the carbon in it needed for this task. I just cut a little plate teensy bigger than a std servo mount, cut a hole in that for the micro...thin layer of silicone on the plate where it gets stuck to the mainframe and a little bolt in the normal std size servo mounting holes to secure the whole thing. You have to keep it all super light otherwise you defy all purpose. Then just mount your micro to the plate as normal using the supplied grommets and things, don't overtighten it at all or the vibrations will certainly kill it...it's a TLAR thing, not too loose not too tight. Other alternative like I used on my Vibe .50 was to double side the servo to the frame and wrap a cable tie loosely around it and the frame.

Then all you need to do is ensure you don't let it bind at all on the throttle, I leave a little headroom at full throttle and fully closed just so vibrations can be taken up there also should the motor for some reason move slightly in relation to the servo when running. Really only need to leave a fart and on the OS motors I use there's actually a little bit over full and over closed where the barrel starts closing again for instance going to full throttle and past...that's my headroom. On most motors however that last few degrees on the barrel don't make a difference anyways as far as top end is concerned. Btw I leave this headroom even when using a std servo, just more particular on the matter with the micros.

Then lastly you just need to ensure when you're setting it all up that you don't strain the servo while tightening down the arm on the carb barrel and all that jazz...real care here as this is where you instantly burn pods and strip gears.

That's about it.
07-03-2008 12:49 PM
 
 
tchavei
rrProfessor
Location: Portugal

Instead of making one, have you considered this?






You can use it for the HS65MG/HB right out of the box or modify it for your needs. I have two myself and I modified one to fit my 3155. Really neat

Tony


--------------------
"Perfection and patience usually walk side by side..."
07-03-2008 12:56 PM
HOMEPAGE  
 
 
Spacey
Senior Heliman
Location: Pretoria, South Africa

That is really tight yes. Never seen it before so thanks for sharing. I like how it still soft mounts nicely on the standard grommets and things.
07-03-2008 01:03 PM
 
 
Carbon Copter
Veteran
Location: USA

That is pretty cool. I have a question though. Since saving weight is way up there on the list when a manufacture makes a heli product, why would they then choose a full size servo compartment on the heli when they could save weight by suggesting you use a micro for throttle and making this compartment micro servo size on the heli? I understand the load from a throttle arm is near nothing, so it seems strange. Perhaps there is some other more technical advantage as I seen others have mentioned in similar posts? I would think that the guy who steps on the pedal the fastest (along with other stuff of course) with equal equipment would win the race. So, translating to a heli (while hardly worth mentioning a diff), would technically mean a faster response time. An 8717 would be nearly 2 times as fast as a 65HB. Of course we are talking 2x as fast but in an extremely short period of time and unimportant to the majority of flyers. However, still worth considering. I will be putting a 9252 on mine, just because I obtained one for 35.00 (another serious consideration $ !). Hard to put a 110.00 servo on when obviously from other posts, a 25.00 HS 65HB does a great job...
07-03-2008 01:42 PM
 
 
tchavei
rrProfessor
Location: Portugal

Quote 
I would think that the guy who steps on the pedal the fastest (along with other stuff of course) with equal equipment would win the race.

Actually not quite true. There is a physical limit to throttle response. Once you cross it, you will create a lag effect where the engine starts sucking air (due to opening throttle barrel) faster than the fuel has time to enter the chamber. Additionally pressure is lost and the whole system gets out of whack for brief moments. If you're using an agressive governor (most today are) coupled with a super fast servo (like the 9254) you will start experiencing that lag effect during pitch unloading maneuvers (air flow gets cut too fast making the engine choke on the fuel). In practical terms what you feel is that the engine misses a stroke or two. SInce the engine is turning at 17000+ rpm this will feel like a hickup. on planks this effect can effectively cause a dead stick.

I used to be a great supporter of ultra fast servos on throttle until I started to experience these problems. Once I moved to slower servos (9252, 3155, 3151, 3152, etc) the problem dissapeared.

Tony


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"Perfection and patience usually walk side by side..."
07-03-2008 02:03 PM
HOMEPAGE  
 
 
Topher
Veteran
Location: Rochester, Michigan

I run a Hitec-475HB servo. Works find for me since I only do light aerobatics and no 3Dz.

will wash your heli for a quarter
07-03-2008 02:16 PM
HOMEPAGE  
 
 
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JR Heli Vibe - Airskipper - Sylphide - Venture > Throttle Servo Choice for Vibe 50
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