View Full Version : 3100 or 3154??
freakinnovice
07-18-2008, 12:40 PM
Alright guys from your replies I'm putting together my 200 kit. My last question is which is better the logitech 3100 vs the futaba 3154 servo for the rear. I've been told by a hobby shop that the 3100 is to large for the 200 which I know is incorrect from all the threads on the folder. But I would just like to know the pro's and con's of each.
After this decision is made I'm ready to go and I'll be part of the club.:banana
D
stoatnchips
07-18-2008, 03:16 PM
Depend on the Gyro... if You do not have a Logictech Gyro then using the 3100 has no real advantages. You could get a clone of the 3100 like the Robbe or SJM
http://www.helifreak.com/showthread.php?t=83672
freakinnovice
07-18-2008, 03:29 PM
Sorry about that. I'll be using a 2100t gyro. The hobbycity servo is the same price as the futaba. Is the 3100 clone a better servo for the 200?
stoatnchips
07-18-2008, 06:55 PM
No its not that its better... If i remember it right the 2100 Gyro has 3 modes Analog, Digital and Digital Narrow Pulse. You can only get the high performance Narrow pulse working right is if you use a Logictech servo with this gyro. I also believe that the 3100 Servo has 2 modes of opperation, normal Digital and Digital Narrow pulse... and it too will only work in the higher mode if it is connected to a Logictech Gyro.... something about digital centering modes i think.
So its not that the clones are better... after all they are clones.. its just that they will work in narrow pulse mode with other gyros that support this function... the 3100 will only work with the 2100 or 6100 Logictech Gyros.
So bottom line is i would buy the 3100 servo. Can anyone else confirm what i have said or does the 3100 work with the Spartan in the higher frame rates??
GreenCello
07-18-2008, 07:32 PM
Angelos designer of the Spartan 760 previously wrote that the 3100 works with the Spartan. The logitech 3100 was designed to work with the logitech 2100
freakinnovice
07-18-2008, 09:06 PM
No its not that its better... If i remember it right the 2100 Gyro has 3 modes Analog, Digital and Digital Narrow Pulse. You can only get the high performance Narrow pulse working right is if you use a Logictech servo with this gyro. I also believe that the 3100 Servo has 2 modes of opperation, normal Digital and Digital Narrow pulse... and it too will only work in the higher mode if it is connected to a Logictech Gyro.... something about digital centering modes i think.
So its not that the clones are better... after all they are clones.. its just that they will work in narrow pulse mode with other gyros that support this function... the 3100 will only work with the 2100 or 6100 Logictech Gyros.
So bottom line is i would buy the 3100 servo. Can anyone else confirm what i have said or does the 3100 work with the Spartan in the higher frame rates??
I had no idea there was a extra feature in the 2100 that can only be used with the 3100. Unfortunately, I've already put in my order for the 3154. How much of a difference does this "Narrow pulse" signal make with this heli?
piper
07-18-2008, 09:19 PM
I have a Spartan 760 and the 3100. It works great together. The gyro has a high frame rate setting that works with this servo.
stoatnchips
07-18-2008, 09:34 PM
It depends on how good you are, if you're not flying 3D then i doubt you will see much difference between Digital and Narrow pulse modes. I know we all crave the 'Best' solution if its only a few pounds/dollars more but stick with the 3154 now you have it and if/when it burns out or you improve then move to the 3100. As i understnd it, Narrow pulse or high frame rate refers to the pulse width of the signal sent to the tail servo. Basically, a Gyro will send data to a servo in a constant stream of pulses, telling it how far to move and in which direction. The faster this information is sent, the more updates the tail servo recieves per second... then the more accurate and better hold it will have.
Take the analogy of a massive piece of Tarmac with a track painted on it, a car driver which is blindfolded (Tail Servo) and a codriver (Gyro) giving directions. If the car is moving at 5 mph and the codriver gives instructions every 5 seconds... "Left a bit... right a bit" etc etc then the car would get round ok and an observer would see a fairly smooth circuit. However if the car was moving at 30 mph then the codriver would have to give directions at a much faster speed... maybe every second... "LEFT!! RIGHT!!" to keep the car on course. So its really how fast you 'Drive' or how hard you fly, that determins the required frame rate.
rotorhead58d
07-19-2008, 02:11 AM
great explanation stoat. :thumbup:
GreenCello
07-19-2008, 07:23 AM
In a very long thread concerning the Spartan 760 setup, Angelos stated that in his opinion the faster framerate servos only improved time by 1ms which, considering mechanical limitations of the system, was insignificant.
stoatnchips
07-19-2008, 10:16 AM
That’s exactly what i thought; the performance improvements will be imperceptible to us mere mortals!! However, when the likes of Logictech, Futaba, JR, Spartan, CSM to name a few, all offer these gyro settings on their higher end units… it makes me think… there is either something to it or its just another marketing tool to extract more money from us in the pursuit of ultimate Bling! :thinking
BTW, Centering pulse widths are not quite a direct relation to fps but thats another set of tech that i need to look into when i get more time. I'll take Angelos' word on any Gyro related issue though.;)
GreenCello
07-19-2008, 11:20 AM
Angelos seemed to feel that the marriage of brand gyro to brand servo was more of a marketing ploy wirh little benefit to the user however as has been stated the Spartan has the high speed option while a 401 wound not work with the logitech 3100.
401 will work with the 3100 in digital mode I thought?