gauravag

Hello everyone,
I have a Futaba 2.4 Ghz 6EX radio and i am planning to use Hitech 5645MG and 5955TG servos for my 50 CC Yak.
Now this would be the first time i would be using a non-Futaba servo, and would like to know there would be any problems in using these servos with the 2.4 Ghz receiver (R-617FS).

I read several threads about the Signal voltage issue (FAAST system having a lower 2.7Volts signal), and would like to know if i would be having any problems with this setup ?

Also is a 4.8V battery recommended or a 6.0V . I know the current drain would be a lot, so might go in for a 2000maH receiver battery, but not sure what voltage would be the best.

Thanks to everyone for responding.
-Gaurav

BuschBarber

My Feedback: (2)

Generally, going to 6v gives you more speed and more torque. it also gives you more of a safety margin, voltage wise. The specs on the servo box usually lists the parameters for both voltages.

Using Digital servos will draw more current. Flying 3D will use up the battery faster than flying Straight and Level.

I have used the 5645 servos with Futaba PCM Rx's and with the Spektrum AR9000 2.4 Rx's. I do not know if the FASST Rx's have any special problems with Hitec Digital servos.

DougV

Gaurav,

The only FASST receiver that uses that 2.7v is the 14 channel R6014FS, that it didn't work with an older Hitec servo, all other receivers are 3.0v.
http://www.rcuniverse.com/forum/m_8260794/tm.htm

I use Hitec and JR servos with the 6014 with no problems.

You can use 4.8 volt batts with the FASST system, however, if you are going to use digitals servos, I will use 6.0 volts or better yet A123's.

Regards,
Doug.

altavillan

My Feedback: (1)

The 607 and 617 2.4 rx's work fine with Hitech servos. I've had two 50cc gassers full of Hitech 5955's on them for over a year now no problems. Not so with the 6014 rx. Mine needs a power expander to run the Hitechs, but I hear the newer ones have the signal voltage bumped up a bit.

gauravag

Ok, so you mean to say that only the 6014 receiver has the 2.7Volts signal voltage and the 617 would still be using the 3.0Volts and hence Hitecs would work without a problem ?
I read the other thread referenced here, but it was not clear if the hitec servos would work without a problem.

altavillan , are you using a 6.0 volts battery with the 617 Rx ? and no problems ? I just want to be double sure before i invest into the hitech servos for my 50 CC yak.

-Gaurav

altavillan

My Feedback: (1)

A123's on all my planes. they are 6.1v to 6.5v batteries. No one is complaining about Hitech's and 4.8v batteries so I doubt there's a problem.
You should call Hitech to confirm this but I've been told all new Hitech digitals made from about this time last year and newer will run on the 6014 rx. It's just the older servos with the problems.
Come to think of it my e-plane has small digital Hitechs and they work fine on regulated 4.8v becs.

DougV

Yes.
From Futaba:
http://www.rcuniverse.com/forum/m_81...tm.htm#8194053

Doug.

gauravag

Thanks Doug,
I have been reading about the A123 batteries. Futaba recommends using a 4.8V battery pack for their Faast receviers. Would using a 6V pack cause any problems ( overheating etc ) ? The A123 would be giving an even higher 6.6V .
Whats the maximum voltage to be used with FAAST Rxs ?

Silent-AV8R

In general Futaba recommends the use of 5-cell (6-volt) packs with all FASST receivers now. Some written materials still mention 4.8 volt packs, but most of the newer materials say 6 volts. FWIW ALL the 3 and 4 channel receivers were recommended for use with 6 volt systems.

All of the Futaba FASST receivers can handle 6 volts packs without any issues at all. All of mine are set up this way.

The issue with the 6014 only affected a small number of older Hitec servos and Hitec would repair those free of charge since they recognized that as a 3rd party vendor it is their responsibility to make their stuff work with the radios and not the other way around.

pilotpete2

I just saw a post on another forum where Robbe is confirming that the new gold dot version of the R6014RF is 3V output on all 14 channels.
Pete