[JVFan]

Hello,
I'M thinking to buy a new radio system, the JR 6102PCM, it come with for digital servo, but I have one plane with regular servo, so I want to know if I gone be able to fly my plane with the regular servo and the FM receiver instead od the PCM, my old radio is an JR XF 421 EX,

By the way, wath is the difference betwen digital and regula servo?

Thank you

[xv-townboy]

if you want a nice set up look no further..futaba too

[scaleguy]

Originally Posted by xv-townboy

if you want a nice set up look no further..futaba too

https://www.rccanada.ca/bb/viewtopic.php?p=91464#91464

How come on you are trying to hijack his thread!

You didn't even offer any answers to the digital question.

Digital servos meen that you get to spend a LOT more money per servo!

Seriously though the resoloution of a digital servo is way better then an analogue one. The motor amplifier is differnt between the two alowing much more precise control, ie movement of the output arm, with the digital.

Besides forget FUtaba.. buy Airtronics!!!!!

[xv-townboy]

ok..sorry about that . dont see how digital is really neccessary unless your into precision type flying..jmho..what kinda plane are thinking of putting them in??..futaba Rocks :P

[Nuker]

Hi Yves,

to answer your actual question , the servo type does not make a difference with PCM or PPM. Your old radio can run digital servos and your new radio can run the old servos. It's only the receiver that makes a difference with PCM/PPM in your plane.

For the receiver question, just check the radio manual to make sure it broadcasts in both PCM and PPM, hopefully at the same time, but that shouldn't be an issue with your new system you are looking at getting.

There are several treads on RC Canada discussing the differences between Digital and regular servos, might be worth a quick search for you.

e.g. https://www.rccanada.ca/bb/viewtopic.php?t=3644

Hope this helps,

Bob

[Gary Maker]

Jim wrote: "Now come on you are trying to hijack his thread!"

If thats a question, you forgot the ? and isn't that: "How come?" LOL! What happened Jimbo, you just get in from Christmas shopping cause the wife made you go? Getting kinda cantankerous in you old age, ain't ya? Just funin with ya my friend!

Although not absolutely necessary in all applications, digital servos are indeed much better than standard servos for more precise aerobatics! Also 100% the holding power of digital servos kick in the moment the servo arm starts to move where as with standard servos the holding power increases as the throw movement increases and only reaches 100% at the full end movement of the servo arm!

In the manuals with each Dave Patrick Models planes, he states that there is no such thing as too much servo ( depending on weight and and size of course ) and that one should always purchase the best servo that you can afford. You have to balance cost with needs though as digitals are usually more $$ than standard servos. Ie: I, personally, wouldn't put $500 worth of digitals in a $100 trainer airplane or 1/4 scale servos into a 12 oz foamie! You get the idea here!

Gotta add my 2 cents worth here...Futaba may Rock, Airtronics is great and JR is Fabulous.. but MULTIPLEX-evo Rules!!!

[pherchris]

Just a bit off of your question here but...

The 6102 is a great radio! I purchased mine a month ago and love it! Lots of great features not found in other 6 channel radios out there . I myself got the PPM with analog servos version because it's all i need, but I've heard nothing but praise over digital!


ChrisR.

P.S. - JR for life

[Guest]

Originally Posted by Gary Maker

Also 100% the holding power of digital servos kick in the moment the servo arm starts to move where as with standard servos the holding power increases as the throw movement increases and only reaches 100% at the full end movement of the servo arm!

It actually takes about 2-3 degrees of travel for digi's to come up to full torque, and about 10-12 for conventional coreless servos to do the same. Once you get out to 15+ degrees rotation the major difference is the holding power.

The huge advantage of digitals comes when you need both large and small deflections....such as one setting for precision and one for 3D. For 3D you use lots of servo throw so either servo would be putting out big torque, but for the low rates say your servo is only moving 8 degrees rotation then the digital will kill any conventional servo for precision as they will have the torque to properly deflect and hold the control surface.

The difference in intial startup torque is the reason most people feel the need to increase the expo when they first go digital. As the digital servo will deflect the surface further at low deflections than a conventional servo will.

As I always say, unless you have a nice tight linkage setup you wont see any benefit of getting better servos, the difference in precision between "analog" and "digital" is quite small compared to the slop in many linkages.

[JVFan]

Yes, the price with the kit he offer to me is about $40.00 betwen the digital and analog, but the point is more, can I fly my plane setup in analog (Rx and servo's) with a 6102 PCM, the other thing is with the PCM we've get a failsafe system, is it good or not.

Thank
Bye

[Guest]

Originally Posted by JVFan

Yes, the price with the kit he offer to me is about $40.00 betwen the digital and analog, but the point is more, can I fly my plane setup in analog (Rx and servo's) with a 6102 PCM, the other thing is with the PCM we've get a failsafe system, is it good or not.

Thank
Bye

For $40 take the digitals! Today the price difference between a conventional and digital servo is almost nothing, so regardless of how much benefit one is over the other you may as well go with the "slightly" better servo.

PCM is worth the money as well, not only from a failsafe point but also an increase in signal rejection.