W37 Cepeda
Posts: 366
Joined: 6/2/2006
From: Pompano Beach,
FL, USA
Status: offline
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Army.
You mentioned replacing some of the servos on the DF37. with HS-55 from HItek.
I did the same, but discovered some things we should bring up on this forum.
There are good things and bad. This is the list of what at least happens on mine.
1. If you replace the rudder servo with a HS-55 you loose the rudder mixing feature.
rudder mixing is a function of gives more rudder "out" as you increase the throttle.
This prevents the copter from jaulting clockwise when starting it or decreasing throttle.
On my unit it starts to spin clockwise until I reach a certain throttle point, this is ok,
but it was better before, cause the copter never moved in any direction until I commanded it.
Also, this is important, you must switch on the GYRO back to "normal mode"
2. If you replace the left and right servo, you actually reverse the left and right function.
The proper way to fly is to place the copter facing away from you. Nose foward, tail back, that's
what you see. When you apply left elevator, the copter goes left, apply right elevator, it goes right.
With the HS-55 servos, this is reversed. This could be a bit confusing for those who learned how to
fly the other way. The guy at the hobby shop said to reverse the function on the remote. Well , I have tried
that, with no resolve. I know it could be done by swapping potentionmeters inside the remote, is it really worth it? well. I don't know.
3. Replacing the servo that controls foward and reverse, has no impact.
The only thing that stands to gain, is responsiveness. The HS-55 are more responsive, and give
you better control of the copter, to the fact it makes it easiler to fly. This is a big plus. If you
can live with a reverse left & right function, then no problem.
I highly recommend leaving the rudder servo alone. The Gyro is programmed to work with the original
servo.. the rudder mix and AVSC function will be off when you install the HS-55 in it's place. If you fly with the
GYRO in NORM position, you will not feal the impact, except for the missing rudder mix feature.
One note on Servos..
If you killing your servos, did you know that most hobby shops tell you not to throw them away or even
replace them? YEP. I lost 2 original servos on my DF37. The gears were eaten up inside. Some hobby shops sell
servo repair kits. I will find one that can be used to replace the gears inside the walkeras servos.
These kits range from 3 -6 bucks. And its very simple to repair a servo. More on this later.....
Good Flying.
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Printable Version
All Forums >> RC Helicopters >> Electric RC Helis >> Walkera Helis - Dragonfly, etc.. >> RE: WALKERA 37 
RE: WALKERA 37 - 
and seek advices from the veterans here.
Got the main rotor blades, some head pieces, the tail boom and the tail holder. Hey Army mine will look like yours with the Align boom I already had with the servo mount (already Installed). How come the parts bills always seem to come within a couple of dollars of $50. Humm. Oh well I was going on a trip anyway. 