12Z Throttle cut

[ex-celler]

From Linkage | Throttle Cut, I am unable to cursor into CUT POSITION to set the SETTING RANGE on the right side of the screen. I can only scroll the three edits on the left side of the screen. Any ideas?

What I want is to be able to kill the engine at any throttle stick position.

Assuming CUT only activates at the bottom of the throttle, any suggestions for setting up a mix to kill the engine from SW SC in any condition?

TIA

[Hotwings]

this shouldn't be difficult, i'll have to think about it though.

Ron

[RCfan]

Setup a condition controlled by SC with higher priority than any other condition. Setup throttle-curve to force engine cut-off in that condition.

In the THROTTLE CUT screen, SETTING RANGE is meant to tell you what portion of the throttle throw is available to establish the CUT POS; you can't cursor to it. You cursor over to CUT POS and then use the rotary to dial in the cut value (somewhere between 0 and 50%).

[ex-celler]

Setup a condition controlled by SC with higher priority than any other condition. Setup throttle-curve to force engine cut-off in that condition.

Yes, I considered that but figured it was overkill just to move one servo to a preset position. There must be a way to link/mix to an Aux channel...or offset...or something.

In the THROTTLE CUT screen, SETTING RANGE is meant to tell you what portion of the throttle throw is available to establish the CUT POS; you can't cursor to it. You cursor over to CUT POS and then use the rotary to dial in the cut value (somewhere between 0 and 50%).

CUT POS is where I'm trying to cursor to but cannot!

[RCfan]

You can try to mess around with mixes, but it's so much cleaner with a condition. Then again, that's what THROTTLE CUT is for with the added safeguard of having the throttle at a low position (assumes you're on the ground)! It's not overkill as long as you have condition slots open, the's why they exist.

CUT POS is the field right below ACT/INH (cursor down once to get into it), not the info box, CUT POSITION, on 2/3 of the screen. )

[ex-celler]

You can try to mess around with mixes, but it's so much cleaner with a condition. Then again, that's what THROTTLE CUT is for with the added safeguard of having the throttle at a low position (assumes you're on the ground)! It's not overkill as long as you have condition slots open, the's why they exist.

CUT POS is the field right below ACT/INH (cursor down once to get into it), not the info box, CUT POSITION, on 2/3 of the screen. )

:oops: OK, I see what you're saying...but that just sets the servo position once activated. I wanted to raise the point where it activated.

What I'm after is a KILL switch (anti chicken dance, "In case of emergency" switch) for when that elevator servo fails in flight. I don't want to have to drop collective to activate CUT.

I would like to do it with a mix just to learn how...after all this radio is supposed to do anything you can imagine!

[RCfan]

What I'm after is a KILL switch (anti chicken dance, "In case of emergency" switch) for when that elevator servo fails in flight. I don't want to have to drop collective to activate CUT.

In that case, look at Throttle Hold-> Cut Mode.

[ex-celler]

After an hour of playing with the various mixes and offsets, I admitted defeat and went with a condition...done in 30 seconds!

[NolanManley]

After an hour of playing with the various mixes and offsets, I admitted defeat and went with a condition...done in 30 seconds!

Could you run thru what you did on condition. I think I'm going to go that route too.

Thanks

[ex-celler]

Could you run thru what you did on condition. I think I'm going to go that route too.

I created a new condition, renamed KILL and moved to the bottom of the condition list. Assigned SW SC, bottom pos ON.

With KILL active, go to THR CURVE, 3rd page and set Group to SINGLE.

Page once more to get back to main THR CURVE screen. Set mode to LINE. Delete all points except 1st and last. Set the remaining two points to rate 0.

Verify servo position in the SERVO MONITOR screen. My THR CUT moves the servo to +90, and KILL also moves it to +90.

(it would be nice if SERVO MONITOR were always one button away and contained a BACK button to the previous screen.)

THR CUT is used for normal operation and hopefully I'll never have to use KILL!

[RCfan]

Don't forget to check-out CUT MODE under the THR HOLD screen.

[DavidH]

Why not do what Mongo suggested above?
In Throttle Hold condition. Make one of the sliders the throttle trim. Then when in throttle hold you can take the slider and adjust the idle of the engine or kill it by pulling the slider all the way down.
That is the way I have done it for years with the 9Z and now the 12Z.
If needed the above will kill the engine at any throttle setting.

David

[NolanManley]

Both ways are great solutions.
I personally have always used a toggle switch to kill the engine but since I like to use the YS engines the slider has stired my intrest. In a pumped system it's better to have your throttle closed after engine cut off to keep the pressurized system from flooding the carb before you can release the pressure from the tank. I have always just held the kill switch "on" till I released the pressure (one handed) but it would be an easier job with the slider system and both hands free.

THANKS GUYS!

[ex-celler]

Why not do what Mongo suggested above?
In Throttle Hold condition. Make one of the sliders the throttle trim.
David

Again, this switch will only be used when a crash is immanent to reduce the possibility of personal or property damage. The goal is to remove all power to the MRB’s NOW! I really don’t want to hit hold and then find a slider all while trying to control a crippled machine. Switch C is easy to find, slam it down and hang on!

It is not for normal shutdown after the flight either. (Although I too fly YS and like the idea of having the carb completely closed on power off.)

I also don’t want HOLD to CUT because it kind of limits the number of autos one can practice in a given flight.

[RCfan]

I also don’t want HOLD to CUT because it kind of limits the number of autos one can practice in a given flight.

Doesn't work that way. You can have your normal hold (THR HOLD->IDLE MODE or a condition) on SG (for autos) and use SC for THR HOLD-CUT MODE.

(it would be nice if SERVO MONITOR were always one button away and contained a BACK button to the previous screen.)

It sure would be nice!

[DavidH]

Hitting hold and full positive pitch if heli is upright will remove all power to main rotor blades, even with engine idling. Or full negative pitch if model is inverted.
The blades will stop spinning in short order.

Also should not have to close the carb on the YS to keep fuel from it when engine is not running and tank is pressurized. If fuel is getting into the carb with engine off and tank pressurized. Sounds like the valve on the regulator is not working correctly. I used YS engines for over 10 years. Only had that problem when something was wrong with the regulator.

David

[NolanManley]

Well I learned something new then as I just assumed it would flood so I practised the switch hold trick for years now. :oops:
If I forgot to remove pressure (Like in my early days of YS engines) it would be hell to start next time by hydro lock. I figure that it must have been the long duration of constant pressure to the carb that caused the flooding. :dontknow

Thanks David :noteworthy

[ex-celler]

Doesn't work that way. You can have your normal hold (THR HOLD->IDLE MODE or a condition) on SG (for autos) and use SC for THR HOLD-CUT MODE.


Got it! That's exactly what I'm after. Thanks all!

(I guess it just takes some time for all these features to sink in :? )