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RJX Hobby Hurrican 50 - Xtreme 50 > Idea for throttle servo
 
 
Wise
Heliman
Location: Gävle - Sweden

Any tips on a decent throttle/govenor servo for the X50? I'm thinking of a HS65 KB or MG, is it any disadvantage to use a micro servo over a standard size? My plan is to get my hands on a MultiGov when it's back in stock. And use a friends spare TT Alpha Zero at the meantime.

Thanks
/Henrik
05-05-2008 09:55 PM
 
 
I3DM
rrProfessor
Location: Israel

Regardless of the weight of the standard size servo vs. the smaller HS65, You will benefit more from a fast throttle servo. The HS65 is not fast.

Team pilot for RJX, Helidirect, Logictech, ThunderPower, Fromeco
www.liorzahavi.com
05-05-2008 10:11 PM
HOMEPAGE  
 
 
jackheli
Elite Veteran
Location: Vancouver - Canada

Not trying to create polemic discussions or anything but the response of a combustion engine to the opening and closing of the carburetor barrel is so lethargic that almost anything will do.

Putting a fast servo on throttle is useless...

BUT... I would put a servo with a better service record than a Hitec 65.



Anyone who has never made a mistake has never tried anything new - Albert Einstein
05-05-2008 10:25 PM
 
 
I3DM
rrProfessor
Location: Israel

Jack,

I would have to disagree. most 3D pilots benefit from better performance with fast throttle servos.

Team pilot for RJX, Helidirect, Logictech, ThunderPower, Fromeco
www.liorzahavi.com
05-05-2008 10:38 PM
HOMEPAGE  
 
 
jackheli
Elite Veteran
Location: Vancouver - Canada

I know... it is the the common perceived knowledge.

Have you ever fired an engine at the bench? remember how long it took for the engine to speed up after you opened the carburetor completely?

There are several threads demystifying this issue. It takes a looooooong time for the engine to start sucking in more fuel and air after the barrel is opened, and it takes even longer for the engine to rev-up, much longer than any servo takes to reach full extension.

On some of my helicopters I used a digital servo only so that a loaded spring would close the carburetor in case of a power failure, having that the holding power of a digital servo at rest is almost null. That is the only possible reason I would use a speedy servo on throttle, but that is just me.



Anyone who has never made a mistake has never tried anything new - Albert Einstein
05-05-2008 10:45 PM
 
 
holzback
Senior Heliman
Location: Terre Haute IN United States

that is true from an idle, but we are talking from 70-80% power which would make the responce of the engine a lot faster.this being the case i would think a faster servo is better.
05-05-2008 10:52 PM
 
 
holzback
Senior Heliman
Location: Terre Haute IN United States

put the engine on the bench and run it a 75% full power and see how fast it responds.
05-05-2008 10:54 PM
 
 
I3DM
rrProfessor
Location: Israel

jackheli thanks for your input, i do agree with holzback though.
It does make a difference in flight for some pilots.

but unless you fly hard, you could probably use a rather slow servo as well.

Team pilot for RJX, Helidirect, Logictech, ThunderPower, Fromeco
www.liorzahavi.com
05-05-2008 10:54 PM
HOMEPAGE  
 
 
KYLE 05
Senior Heliman
Location: Houston,Tx

TRY THIS FUTABA

3156. It's light and pretty quick. .10 I think,but only 19grams if memory serves me correct. You will have to make a adapter mount.

Dont walk in my footsteps----I think I stepped in something!!!!
05-05-2008 11:10 PM
 
 
ez2bgman
Elite Veteran
Location: N'awlins, LA

I use the Hitec HS65HB with the Revmax and the Carbsmart. It has performed absolutely flawlessly. At .11 sec it is more than quick enough to keep up with demanding 3D flight. We worked it pretty hard at the Mayday funfly this passed weekend and the HS65HB's never missed a beat.

Gary
RJX of USA
Magnum Fuels
SwitchGlo
>Hot Girlz in da gallery<
05-06-2008 12:05 AM
 
 
jonzey
Heliman
Location: new zealand

I'm using a HS82MG with MultiGov and hasn't missed a beat, its done well over 100 flights and if it fails its super cheap to replace with a new one.

see it want it buy it...
05-06-2008 08:53 AM
 
 
tchavei
rrProfessor
Location: Portugal

Anything under 0.16 is useless and sometimes can me counterproductive.

If you're engine is capable of going to from idle to WOT and back to idle in less than 0.06 seconds congratulations.

I was a die hard fan of the 9254 on throttle but then I started to experience something called pressure lag i.e. when you open throttle too quickly the engine will loose fuel pressure faster than the time it takes for the fuel flow to increase or something like that. In practical terms what that means is that some of my engines started to develop an ugly "hick" during a rotor disc unloading phase. Don't forget that if you're running 6V you will also need a stepdown for the 9254 on throttle because modern governors will fry it just as the gyro on the tail.
I finally tried a mini 3155 (0.12 sec, 6V, metal geared, 22gr) and everything is perfect now on all my birds.

Tony


--------------------
"Perfection and patience usually walk side by side..."
05-06-2008 12:11 PM
HOMEPAGE  
 
 
Foxden
Key Veteran
Location: Port Charlotte, FL. USA

Interesting,

Thanks Tony, I have been running 9650's and on the MultiGov they have been working great but I may try a micro servo next time.

Clyde Fox
Port Charlotte FL
RJX of USA Field Rep
Team Rotorworkz
Morgan Fuel Rep
05-06-2008 12:20 PM
HOMEPAGE  
 
 
tchavei
rrProfessor
Location: Portugal

9650 is between 0.11 and 0.14. Perfect in my book. Like I said, its when we start putting 0.08 or 0.05 servos when you start noticing that lag.

Tony


--------------------
"Perfection and patience usually walk side by side..."
05-06-2008 12:33 PM
HOMEPAGE  
 
 
rsalazar
Key Veteran
Location: Florida, USA

Thanks Tony for the tip, I will try it in my heli
05-06-2008 12:52 PM
 
 
Foxden
Key Veteran
Location: Port Charlotte, FL. USA

Tony,

Did you run the 3155 in your X50? I know the frames were cut for the HS65 and the spec on the 3155 is about 6mm longer between the HS65 and 3155, just a few minutes on a dremal I would think

Clyde Fox
Port Charlotte FL
RJX of USA Field Rep
Team Rotorworkz
Morgan Fuel Rep
05-06-2008 12:56 PM
HOMEPAGE  
 
 
Eury
Elite Veteran
Location: Ankeny, IA, USA.

I use HS81s for throttle servos, they work great. On the X50, you just need to extend the throttle servo slot a little bit to accommodate it.


Nick Crego
I'm not going to put my lot in with economists.
05-08-2008 03:48 AM
 
 
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RJX Hobby Hurrican 50 - Xtreme 50 > Idea for throttle servo
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