programming a conditional mix????
#1
Thread Starter
programming a conditional mix????
I had an issue yesterday flying my CARF Lightning on a Spektrum DX18.
I carelessly nudged the wheelbrakes on slightly, allowing all the air to escape (one big air cylinder).
Yes I know I could fit a second cylinder, but the other option is to program the Tx so that the brake valve works (opens) ONLY when the gear is down.
I have spent hours reading the manual and fiddling with the p mix parameters but I have not been able to get it to work.
Anyone able to offer detailed advice?
I carelessly nudged the wheelbrakes on slightly, allowing all the air to escape (one big air cylinder).
Yes I know I could fit a second cylinder, but the other option is to program the Tx so that the brake valve works (opens) ONLY when the gear is down.
I have spent hours reading the manual and fiddling with the p mix parameters but I have not been able to get it to work.
Anyone able to offer detailed advice?
#2
Set up the mix so that when the gear switch is in the gear down position, the mix is active. Then set the % for the gear channel to the brake channel mix. Probably 100% to 100%.
But seriously, only one can? Also, it sounds like you do not have a good proportional brake valve. You might take a look at an Ultra Precision 1 brake valve. I pump up the brake tank, which is very small, about once every 20 flights or so. Sounds like you got one of those cheap electronic brake valves that takes a whole tank of air for one stop. a UP1 will stop that and would preclude the problem you experienced, even with one tank!
But seriously, only one can? Also, it sounds like you do not have a good proportional brake valve. You might take a look at an Ultra Precision 1 brake valve. I pump up the brake tank, which is very small, about once every 20 flights or so. Sounds like you got one of those cheap electronic brake valves that takes a whole tank of air for one stop. a UP1 will stop that and would preclude the problem you experienced, even with one tank!
#5
Alasdair,
On my Ultra Flash I have one air tank. I have a program mix that mixes down elevator with the brakes, but only when the gear switch is in the "DOWN" position.
My retracts and brakes are actuated by a mechanical valve & servo
I cannot not get my iPad to post photos on here, but if you PM me your email, I can send them. It's just some screenshots of my Tx screen showing the mix. It's the JR DSX-12, but hopefully it gives you the idea
Nice to see you at the weekend
Stuart McCallum
On my Ultra Flash I have one air tank. I have a program mix that mixes down elevator with the brakes, but only when the gear switch is in the "DOWN" position.
My retracts and brakes are actuated by a mechanical valve & servo
I cannot not get my iPad to post photos on here, but if you PM me your email, I can send them. It's just some screenshots of my Tx screen showing the mix. It's the JR DSX-12, but hopefully it gives you the idea
Nice to see you at the weekend
Stuart McCallum
#6
My Feedback: (51)
you can also do this trick - when gear is in UP position:
mix brakes --> brakes with -100% / -100%
this will leave the brakes channel comptely off, at 0% position (middle of travel). then add offset to move as you like to be at lets say -100%.
Done! permanent -100% on brakes channel with ease, when gear is up.
mix brakes --> brakes with -100% / -100%
this will leave the brakes channel comptely off, at 0% position (middle of travel). then add offset to move as you like to be at lets say -100%.
Done! permanent -100% on brakes channel with ease, when gear is up.
#7
Thread Starter
That is a great idea. I'll do that from now on.
I didn't build this jet with just one air tank and the two Jet Tronics valves, a double for gear and single for brakes.
I bought it second hand, and to be fair this is the first time I have had this brake problem in 8 years.
I started with a Weatronic dual Rx with GPS controlled by a JR 388S but changed to a Spektrum DX18 with AR12020 when they came out.
changing the air supply will do the job, but I would still like to learn more about programming the DX18.
Is there a source of detailed step by step instructions (e.g. website)
i3dm, I have tried to fit those numbers into a Mix but it doesn't work and I have no idea what they do, which doesn't help.
Are the workings of these mixers explained ANYWHERE?
I didn't build this jet with just one air tank and the two Jet Tronics valves, a double for gear and single for brakes.
I bought it second hand, and to be fair this is the first time I have had this brake problem in 8 years.
I started with a Weatronic dual Rx with GPS controlled by a JR 388S but changed to a Spektrum DX18 with AR12020 when they came out.
changing the air supply will do the job, but I would still like to learn more about programming the DX18.
Is there a source of detailed step by step instructions (e.g. website)
i3dm, I have tried to fit those numbers into a Mix but it doesn't work and I have no idea what they do, which doesn't help.
Are the workings of these mixers explained ANYWHERE?