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2.4G Spektrum Radios Spektrum 2.4 Gigahertz Radios and Technology


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Old 09-13-2007, 01:46 PM   #1 (permalink)
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Thumbs up How to: DX7 Throttle Cut Switch

I just like a throttle cut switch and didn't like the way the DX7 uses the trim and throttle recovery to cut your nitro engine. So i figured out a way to set up custom mix and make a throttle cut switch.

Video Link ->How to set up a Throttle Cut Switch on a DX7 radio (23 Megs)

Enjoy,
Bob
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Old 09-16-2007, 05:45 AM   #2 (permalink)
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Lightbulb Same kinda idea for us watt flyers...

Great Bob! I was just looking at doing the same thing today...pulled out the manual and everything.

But...how would I do the same thing with the AUX2 switch? I'm running a TRex450 with a CC35 and I like their new heli fixed endoint mode for heli's. Problem is, I'm getting into autos and would like to have a "bail out mode". What I had envisioned was setting up the HOLD switch with about 5-10% percent throttle to keep the motor going so that when I flip back to power up the motor, I don't have that spool up lag with the motor. The CC link software advises me to set up a flight mode position to practice autos but I'm not happy with that.

Can I program the AUX2 as a safety switch just like you'd use the throttle hold while setting up to fly? I think this might tie in well with your nitro throttle cut idea.
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Old 09-28-2007, 07:34 PM   #3 (permalink)
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Finless

thanks for the video I am from the Futaba camp i missed my cut feature now i can set this up I too


andres
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Old 09-29-2007, 12:40 PM   #4 (permalink)
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Unfortunatly no... YOu will find the mixes on throttle DONT WORK when in hold mode. So you could do this but you have to come out of hold to make the cut work.

Bob


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Originally Posted by HELINHAWAII View Post
Great Bob! I was just looking at doing the same thing today...pulled out the manual and everything.

But...how would I do the same thing with the AUX2 switch? I'm running a TRex450 with a CC35 and I like their new heli fixed endoint mode for heli's. Problem is, I'm getting into autos and would like to have a "bail out mode". What I had envisioned was setting up the HOLD switch with about 5-10% percent throttle to keep the motor going so that when I flip back to power up the motor, I don't have that spool up lag with the motor. The CC link software advises me to set up a flight mode position to practice autos but I'm not happy with that.

Can I program the AUX2 as a safety switch just like you'd use the throttle hold while setting up to fly? I think this might tie in well with your nitro throttle cut idea.
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Old 10-24-2007, 12:50 AM   #5 (permalink)
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This is awsome Thanks Finless
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Old 10-25-2007, 07:56 AM   #6 (permalink)
 

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Thanks Bob, very helpful indeed.
One Q, can I assign another switch? in particular Aileron D/R.
I find it more intuitive to use my right hand for throttle management.

Ever your humble disciple, ( )
lol.

Duncan.
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Old 10-17-2008, 10:18 AM   #7 (permalink)
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Does Throttle Cut apply for el-heli too?
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Old 10-17-2008, 10:56 PM   #8 (permalink)
 
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throttle cut is for shutting off a NITRO engine. So no, it doesnt apply, sorry
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Old 11-01-2008, 10:19 AM   #9 (permalink)
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Great Stuff! One question though. How do I change my "ON" to "OFF" like it is in the video. I cannot get my throttle cut-off to work and that is the onlything that is different on mine.

Thanks,

Frank
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Old 11-03-2008, 07:53 PM   #10 (permalink)
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Murocflyer the on off is control by the switch the you have used for the throttle cut if it is off then throttle cut is not activated flick the switch to on and engine will cut
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Old 12-10-2008, 01:17 AM   #11 (permalink)
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I've been meaning to do that! I hate the trim down for cut, too!

Thanks!
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Old 02-11-2010, 01:02 PM   #12 (permalink)
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Bob, what do you do when you have the DX7 mixes all setup with Danal's mixes for the AR 7100/R and SwitchGlo? We are running out mix menu availability. So I guess you have to stick with the trim switch, correct?
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Old 02-23-2010, 04:33 AM   #13 (permalink)
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I may be off and probably am, but why can't you just have your trim up higher than center to begin with, then set a value on your throttle hold switch to take it to a level lower than idle that kills the motor?

I really like using the right switch also. Right or wrong thats what I do.

By the way... if this is way off sorry...just how I do it.

Bob is where I go for about 99.9% of all my questions if I can't find it here. Usually it's in the forum and I feel sorry for being a pain in the ass. Example: most recently some mixing questions as of a day or two ago.

Thanks for everything you do Bob as always. I think I'm about ready for my Aurora maiden. Hope it goes as smooth as yours. LOL It was built the same way!
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Old 04-23-2010, 12:28 PM   #14 (permalink)
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Quote:
Originally Posted by Awamori View Post
I may be off and probably am, but why can't you just have your trim up higher than center to begin with, then set a value on your throttle hold switch to take it to a level lower than idle that kills the motor? SNIP
I think the idea is to have a Throttle CUT and Throttle HOLD. If you used Throttle HOLD to work as a cut, then you'd have to restart the engine after every intentional Auto.
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Old 05-15-2010, 10:11 AM   #15 (permalink)
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Hay neat idea but quick quieston does this affect my govanor because of mix2 or by setting this it does not affect my settings?? not sure on this thanks lou
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Old 07-08-2010, 01:10 AM   #16 (permalink)
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I'd really like to redo my throttle linkage and use this mix as a throttle cut but my question is when setting up throttle travel are you supposed to have the trim all the way down I thought I read that somewhere...

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Old 08-26-2010, 11:57 PM   #17 (permalink)
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Great stuff Bob, as always!
This thread gave me a great idea for another:
https://www.helifreak.com/showthread...39#post2292739

Failing that, could aux2 be the throttle kill switch and throttle hold / flight mode / gear-gyro switch as normal?
(even if throttle hold had to be deactivated for aux2 to kill the engine)
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Old 09-08-2010, 10:14 AM   #18 (permalink)
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* Before setting up, bind your receiver to the transmitter. This is done by plugging the bind plug into the BATT socket in the receiver. Then plug the battery to the esc and/or bec. Then press the transmitter bind button at the back as you turn on the transmitter. Wait for the flashing receiver lights stabilize. When it has bound, the esc will arm. You can release the bind button. Turn off the transmitter and unplug the heli’s battery. Remove the bind plug from the receiver.

I. System Setup Mode

1. Enter the System Setup Menu by pressing Scroll Down and Select keys while turning on the transmitter.

2. Press UP or Down keys to navigate.

3. Go to [TYPE SELECT] and choose HELI for your model.

4. Go to [MODEL SELECT] and assign a model number for your heli. Use the Increase or Decrease keys to toggle between choices.

5. Go to [MODEL NAME] to assign a custom name. Use Increase or Decrease to select letter. Press Select key to move to next letter.

6. Then press the Down key to go to [SWASH TYPE] menu. Use Increase or Decrease key to toggle to 3 SERVOS 120º.

7. Next go to [INPUT SELECT] menu by toggling UP or Down keys. It should be
AUX2>AUX2 and GEAR>GEAR.

II. Function Mode

1. Enter the Function Mode menus by pressing Down and Select keys after turning on the transmitter.

2. Use the UP or Down keys to toggle between menus.

3. Go to [REVERSING SW] menu to set your servo reversing switches.

Ch1 : Throttle (esc)
CH2: Aileron (left cyclic servo)
CH3: Elevator (front or rear single cyclic servo)
CH4: Rudder (gyro)
CH5: Gear (gyro remote gain cable)
CH6: Aux1 (right cyclic servo)

*Note that this is for individual servo reversing. For collective cyclic reversing, go to [SWASH MIX] menu.

4. Go to [SWASH MIX] Menu. Use Select button to toggle between functions.

5. Initially set AILE, ELEV at 100%. – or + values changes the servo directions. Set PIT value so that you get maximum + and - pitch without bottoming mechanically or have the servos buzzing. Again – or + values reverses the collective direction.

6. Leave EXP in INH.

7. Go to [TRAVEL ADJUST]. Use Select key to toggle between functions.

8. For THRO, set High (H) value just high enough so you get a max motor output (ESC led flashes) at max stick input. At times, this can be less than 100%. Set Low (L) value just low enough that the esc arms. At times, this is less than 100%. This provides best throttle resolution.

9. AILE, ELEV, and PIT. adjusts the cyclic servo maximum throw. Always adjust all three pairs of H and L in identical values. Values for AILE, ELEV, and PIT. must also be identical. This ensures no unneeded output interaction when controlling the cyclic action. You can adjust these to give you more or less cyclic angles. Max these out without having the servos buzzing. Recheck these settings after centering the servo arms at mid stick using the [SUB TRIM] menu.

10. Adjusting the RUDD endpoints, controls the piro rate not the servo throw. Remember that the servo receives a command signal rather than a proportional
signal. Adjust L and R piro rates so that you get the same piro rate turning left or right. IT is normal to exceed 100% for both values.

11. GEAR is used to adjust gyro gain. + value is hh mode. – value is rate mode. Set these initally at +72% and -28%. Readjust after a test hover.

12. AUX2 is unused for now. The channel is unavailable in the AR6100. The switch, however can be assigned to a function like throttle hold. This frees up the use of the Rudder D/R switch for other functions like dual piro rates.

13. Go to [SUB TRIM] menu.

14. Adjust AILE subtrim to center the left cyclic servo in mid throttle stick.

15. Adjust ELEV subtrim to center the front or rear single cyclic servo at mid stick.

16. Adjust PIT. Subtrim to center the right cyclic servo.

17. Adjust the RUDD subtrim if servo arm drifts in hh mode during tests.

18. Leave [AUTO D/R EXP] in default settings for now.

19. Go to [D/R & EXP] menu. Use Select keys to toggle between functions. Use Increase or decrease to change channel and change values.

20. Expos if used changes command sensitivity. + values makes command less sensitive. Lower value down to a negative value increases sensitivity. More sensitivity makes the heli twitchy. Full stick, however always yields the maximum programmed servo throw.

21. AILE and ELEV expos affect the cyclic. RUDD affects the piro or turn rate.

22. D/R adjusts the maximum servo arm travel of the affected functions. Reducing AILE and ELEV rates for example reduces the maximum swash plate angles. These can be toggled in flight using the marked D/R switches. Leave these at 100% for now for both on and off switch positions of the various D/R switches.

23. Note that you have two switch positions for both expo and dual rates. Toggle the
actual physical switches when setting values for each switch position. It will be indicated in POS-1 or POS-0.

24.Go to [PITCH CURVE] HOLD. Use Select key to move between throttle positions. Use Increase or Decrease keys to change values. This menu sets the main blade pitch range when the Throttle hold switch is turned on. This gives you maximum positive and negative pitch. This is useful for setting blade pitch using a pitch gauge. Mid stick is zero degrees.

25. Note that 0 to 50% gives you negative pitch. 50% to 100% gives you positive pitch. 0% is maximum negative pitch. For most helis this is -10 deg.

26. In HOLD position, set pitch range as 0-INH-50%-INH-100%.

27. Go to [PITCH CURVE] ST-2. This is for 3D. Set this for maximum head speed and fast collective response for flipping, tic tocs, etc. The S-curve is ideal for this.

28. Set ST-2 at 0-15%-50%-85%-100%. This is an S-curve. Pitch rapidly changes around the mid stick for fast vertical transitions.

29. Go to [PITCH CURVE] ST-1. Let’s keep this linear. Set it at 0-INH-50%-INH-100%. This give a smooth and predictable collective response. This is good for sport flying and mild aerobatics.

30. Go to [PITCH CURVE] NORM. Let’s dial out negative pitch or at least most of it for proper spool up. You can put a few degrees of negative pitch if desired. I prefer zero on spool up. Set this at 50%-50%-50%-INH-100%. This gives zero degrees pitch up until mid stick. Then pitch increase above it.

31. Go to [THRO CURVE] ST-2. You can keep this flat for max head speed. Or use a conservative v-curve for moderate speed. I use 100%-INH-80-INH-100%.

32. Go to [THRO CURVE] ST-1. Set this so that you get a comfortable hovering speed. I set this at 100%-INH-60-INH-100%.

33. Go to [THRO CURVE] NORM. Keep this linear unless you have an unusual motor response. Set this at 0-INH-50%-INH-100%.

34. Go to [THRO HOLD]. Use Select key to toggle between throttle hold value and desired activating switch. Set throttle value at -5.%. It is a negative value to ensure that the throttle is zero in case the esc setting drifts. Choose your desired switch. I selected SW: RUDD D/R simply because I am used to that position. You can use AUX2 if you wish to use the RUDD D/R for dual piro rate control.

35. After all settings are final, bind your receiver to the transmitter once more while keeping the transmitter sticks in your desired failsafe settings. This does away with the cyclic servos being crooked and buzzing while the receiver arms.

36. Fine tune after your test flight.

37. Go fly your heli! Congratulations.
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