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[BarryM]

Nope - The 6EXA seems to be fine for aviation or single screw vessels but poorly suited for anything multi-crew.

I went for the F14 Navy because all my current models are twin screw with multiple functions. The twin throttle F14 navy with the ability to provide a mind-boggling number of channels and expansions at an affordable price met my requirements.  The multiplex may have the virtue of being crystal-less but I bet it doesn't have the same versatility.

The set arrived today from 'A Model World' who once again provided the best price, informative telephone advice and a fast delivery without waiting for my cheque to cash. Highly recommended!

[victorian]

I had a runaway with the previous 40Mhz Zebra + vtail mixer setup (some strange behaviour between the rx and the mixer on signal failure) so bought the 2.4 ghz 6ex because of it's advertised 'fail safe' capabilities.

It was irritating to discover that the 'fail safe' only works on the throttle channel and that the fail safe state isn't passed on through the mixer functions. In any case the only fail safe options are about stopping an IC engine, not going to a mid point for an ESC.

The tech guy at Ripmax was dismissive of my questions about any possible solutions to this saying that I "had bought a bargain basement radio" and what did I expect for the money?!!!

But despite that I persevered and got it to work using the built in Vtail mixer mode with elevator as power and rudder as differential. I didn't notice any servo travel issue but the ESC's are set up against the full stick movement anyway.

I set the ship's rudder on the aileron channel and slaved this to the rudder stick so that rudder moves with differential power, but can also be controlled independently with both motors at full power. This solved the snag with the original mixer setup of the ship losing way in turns due to one motor slowing.

I also slaved the elevator channel to the throttle stick. This gives a ratchet power setting for constant speed and the spring return stick for manouvering.

The signal quality of the radio is rock solid and there seems to be no risk on runaway on signal failure provided the motors are stopped at the time addressing my initial problem with the 40 Mhz set. I intend to utilise the power fail by connecting a motor isolation switch to a dedicated throttle servo in the boat but havn't yet found a source of a suitable servo mounted switch for that and don't really want to make a heath robinson toggle switch assembly.

[Ghost in the shell]

with the 6exa, you can get motor mixing for multi screw boats, snag is, its on the RIGHT hand stick,  engage ELEVON mixing. at first it feels alien having motors on right rudders on left but you do get used to it I have done that to My Yamato

[victorian]

with the 6exa, you can get motor mixing for multi screw boats, snag is, its on the RIGHT hand stick,

That's what I meant. Sorry I didn't explain more clearly. I then slaved the right, elevator, stick to the left, throttle, stick to get normal left hand power control with ratchet and right hand spring return control for manouvres.

[Scottie]

It was irritating to discover that the 'fail safe' only works on the throttle channel and that the fail safe state isn't passed on through the mixer functions. In any case the only fail safe options are about stopping an IC engine, not going to a mid point for an ESC.

The Spektrum 2.4 Ghz system comes with failsafe on throttle but they have also produced a 'robot' version of the receiver which has failsafe on all 6 channels. For anyone interested the Part No. iis SPM6000BR It can be bought from Sussex Model Centre.

[Ghost in the shell]

one thing that has changed between the 6EX and 6EXA us that channel 6 was on the old radio a proportional knob, with the ch5 being a switch on/off, now both 5 and 6 are on/off switches even though the radio has gone from 35 / 40 / 72 / 75mhz to 2.4ghz which is an improvment, the fact that they have gone to a switch on a previously proportional channel is in My opinion a bad move on Futaba's part

[6705russell]

I have just purchased a 6exa and i have a 4 channel reciever already installed in the boat, one channel i use for the sound system but this means i have to use one of the sticks because the switch is on channel 5, can this be altered within the handset so that channel 5 on the transmitter is controlling channel 4 on the reciever or do i just get a 6channel reciever?

Russ

[Ghost in the shell]

im not sure if the mode adjust affects ch5/ch6, so best idea may be to get a new 6ch.