robtv

Quick questions guys puting the final touches on my first Jet and have realise that a 9 channel radio sometimes does not work well i have a dilema it will be the Cortex gyro goes or the Brake and i think it will be the cortex i have Elevator connected with the brake on a Y but losing all of its air due to the gyro and elevator movement using jet tronics brake valve or JR9503 radio any ideas

i also want to thank Kristopher with kightech turbine for taking a few hours of his busy saturday to go over my plane.

lxfly

Use a mixer from elevator to brake and disable mixer when gear is up. the mixer should be programmed asymmetrically from neutral to full elevator down.
Idea: now the gyro may still influence the brake when gear is down; you may try to program an offset of 10% in the mixer to minimize the influence just around the neutral.

gunradd

My Feedback: (9)

Rob glad I could help.

Do not remove the gyro make it work somehow with it. A mix like Rene suggested should work fine.

wfield0455

My Feedback: (7)

I'm assuming you have the brakes on a Y harness because 9 channels isn't enough to have all your control surfaces on separate channels and also have separate channels for brakes and gain for the Cortex ?
If that is the case, it sounds like you will need to either remove the Cortex (Brakes aren't considered optional to fly at any AMA event or field) or else use a Matchbox or similar for your flaps to free up a channel for brakes.
Then you can mix elevator to brakes and have the mix enabled only when the gear is extended as has already been suggested. Since the gyro feeds nothing back to the transmitter it will have no affect on the brakes

Wayne

robtv

I have put ail on a y to open up a channel but it causing voltage drop on one of the servos and making it center will a Jr match box regulate the voltage to the servos maybe that would take care of my problem.

rhklenke

My Feedback: (24)

No, the Matchbox does not regulate its output voltage - it simply provides whatever power source it has to the servos. You can however, provide the Matchbox with its own power source (that it will then send to the servos) instead of it taking power from the receiver...

A mix as suggested above doesn't really help you I believe because a mix requires a separate channel for the brakes too.

Shouldn't 9 channels be enough?

Aileron
Elevator
Throttle
Rudder
Gear
Flaps
Brakes
Gyro

What are we missing?

Bob

George

My Feedback: (57)

Bob,
I can only imagine he is separating surfaces and running out of channels.

What airplane and what is your radio set-up (servos to what channel/s)?

One or two matchboxes should alleviate any issues. If adding a "Y" is causing a big enough voltage drop to notice, something does not sound right. What kind of Y are you using?

Len Todd

Sounds like inadequate power to start with (e.g. running all the servos thru the Rxer buss.) Maybe needs to look at a more effective power distribution system.

gunradd

My Feedback: (9)

Your right George. Hes one channel short so a mix will not help. I tried to help him over the weekend and it was all working great. Not sure what is causing the jitters on the ailerons. It was fine on Saturday. I had a Y on my rudders on the F22 with 496 flights no problems.

The plane is a xcaliber. He did a great job building it very clean install. Rob what servos are on the ailerons?

robtv

I'm using Savox Sa-1231sg

robtv

Is only on one servo and it's not a jitters it's looks like is just centering it self
remove the Y and works all the time I'm using AR9110 and using 2 spectrum
4000mah 6.6 life

wfield0455

My Feedback: (7)

Is this just a straight Y harness or an amplified Y harness ? If it's an amplified Y harness with some active circuitry, most Spektrum receiver manuals state not to use amplified Y harnesses.
If it's a regular Y harness then make certain that a pin isn't partially backed out or some other defect that would prevent it from making a good electrical connection.

Dave Wilshere

Use the Behotec all in one retract/brake valve (1 channel) from the C-36/2 Flash set up. 75% of Xcalibur's flying here, inc all of mine are set up with one
I mix down ele to gear for the extra movement-brake

Dave

robtv

Thank u guys for the help
I went with Jr matchbox for rudder and nose steering and eliminated the Y on the ailerons and opened up the channel 3 for brakes everything looks good will do a range test tomorrow again thanks for the help.

gunradd

My Feedback: (9)

Thats great Rob!!!