Flyboy Shady

Hi,

What kind of torque do I need for the rudder servo in my 25% Extra 300? It weighs about 13 lbs and has a BIG rudder. I generally use Hitec so if u could recomend a specific servo from them I would apreciete it.

Thanks,
/Fredrik

GalenB

My Feedback: (18)

The Htec 5646MG should work fine and a 5945MG would work great! You are planning on using a 6 volt pack -- aren't you? You will want the extra speed and torque that 6 volts provides... If you don't want a digital servo then the 645MG, the 925MG, or the 945MG have the specs you are looking for...

3DFanatic

My Feedback: (5)

Ditto.

bn120

My Feedback: (1)

get the hs-5645 it is only 10.00 more than the hs-645. The 5645 has more torque and holding power.


Darin

Flyboy Shady

It seems the 645 would be fine for my needs.
There must be an error on the web shop at my dealer because the 705MG and the 805MG costs the same as the 645???
I must check that.

What is the advantage of digital servos?

Thanks,
/Fredrik

bn120

My Feedback: (1)

the digital applies 100 % power till it reaches is location, where as a standard gradually looses voltage as it gets to its location (slows down)this means holding power.For instance if you took 2 100oz. servos one digital and the other standard and try moving them from center while the power is on you will be able to move the non digital at about 150 oz. and the digital it will be about 225 oz. these are just guesses but I think you can see the difference.

Darin

Flyboy Shady

So digital servos minimize the risk of flutter, is that how I can interpret it?

/Fredrik

Geistware

My Feedback: (16)

Digital servos have a narrower dead-band. While this will not minimuze flutter, it will make any servo contribution to flutter smaller. I would recommend the hitec 5975 servo. I have them in my Wild Hare Edge and they work great.

bn120

My Feedback: (1)

yes they will help reduce flutter, I had jr 4721 on elevator and swapped it out for a didital and it went away.

Darin

3DFanatic

My Feedback: (5)

More resolution

Geistware

My Feedback: (16)

Better leverage will work as well.