rbort
Elite Veteran
Location: Franklin, MA - U.S.A.
My Posts This: Topic Forum | Setting up a GV-1 on a gasser
Plugs from GV1:
Throttle goes to throttle channel on receiver.
AUX rpm goes to a channel tied to your idle up switch or a channel on a 3 position switch. In the case of a JR 8103 radio, that is AUX3. For a JR 9303 radio, its AUX4.
AUX on/off goes to the gear channel in general or a channel on a 2 position switch.
Into the GV1:
Plug in the gv-1 sensor into the sensor port. Note that the wire polarity going in is opposite of the wires coming out of gv-1. Futaba thought that might be funny. So wires coming out of gv-1 have signal wires down, wires coming into gv-1 will have signal wires up. The gv-1 sensor is keyed so there will be no mistake. If you’re using a stator gator, the wire from the stator gator goes here.
Plug in the throttle servo into the next slot down marked throttle.
If you have a Jewel generator, you may plug the generator regulator into the mixture port of the gv-1 as that is on to the same power bus as everything else.
Programming:
At powerup, the gv-1 will show idle limit. Put engine on idle (throttle stick down mid trim) and push the Data + on the gv-1 to memorize.
Gv-1 will show High next, so go to full throttle and push the Data + button.
Gv-1 will show Stop next, so go to engine kill (throttle stick down trim all the way down) and push the Data + button.
If all OK, you will see Set. If you see Error, then you didn’t move the throttle stick to a different position when you tried to memorize the next function or there is not enough difference between your idle and kill settings for servo throws. Revisit and fix.
Push Func + to continue to the next screens of the gv-1 until you reach some number plus rs1 or rs2. Example: 1550rS1. Now, if you change the idle up switch or the switch tied to the gv-1 speeds, it should go to another number rS2 and then a third number rS3. If it doesn’t change to rS2 and rS3, then your switch is not working properly for the gv-1 rpm speeds or its not programmed or plugged into the right channel on the receiver. Investigate and fix before proceeding. Once fixed, program the 3 speeds that you want using the TX switch to select 1550rS1 and then use the Data +/- buttons on the gv-1 to raise or lower the speed as needed. Go to idle up 1 and it will say for example 1670rS2 and use Data +/- to program idle up 1 speed. Go to idle up 2 and program 1790rS3 adjusting it the same way until you have the head speed that you want.
Press Func + twice to advance to the GRt (gear ratio) screen and adjust the number with the Data +/- to the proper gear ration for your helicopter. Popular numbers are 7.15 or 7.08 for the Spectra-g, and 6.92 or 6.43 for the 1005 gasser.
Press Func + twice again and enable the Stsw (stick switch) by pressing the Data +. It is inhibited by default and must be enabled for throttle hold to turn off the gv-1.
Press Func + once more and you will be at SWCd screen. That is the condition of the gv-1, whether its or or off. To test it, do the following, gv-1 condition stated after :
Engine to idle normal mode: OFF
Throttle up in normal mode: ON (if it doesn’t go ON toggle the gear switch)
Hit throttle hold while throttled up on the stick : OFF
Go to idle up 1 (assumes U shape throttle curve for inverted flying), ON always
Go to idle up 2: ON always no matter where throttle stick is placed
Hit throttle hold in idle up 1 or 2, should go OFF.
Hit the gear switch in any flight mode, if GV-1 is ON, it should go OFF. Once OFF, it should never come ON no matter that you do with throttle stick or idle up switch.
If gv-1 on/off switch is not in the position you like for ON, reverse that channel.
Advance through the mixture functions by pressing Func + as onboard mixture control is not is use.
At the B/FS screen, hit Data + to ACT it. You are activating the battery failsafe function.
Hit Func + once more, on this screen at idle B/FD should show 0%. Go to full throttle and it should show 100%. If it does not, repeat idle limits (step 1 of this document) as it means the gv-1 doesn’t know where idle and full throttle is.
Now, advance the throttle slowly until you reach 20% on the B/FD screen. Hit the Data + button and you will see an * after the 20% indicating the setting has been memorized. You just told the gv-1 to throttle back to 20% in case the receiver battery ever drops momentarily to 3.6v. If this happens in flight due to a dying receiver battery, you will lose power (engine stuck at 20% throttle) but should be able to limp home with low head speed and increased collective. Land immediately and shut down the model before the battery dies, as this is typically a 2 minute warning. If you must get full power from the engine to land for some reason, hitting throttle hold for a split second and releasing it will reset the low battery trigger and give you 30 seconds of normal engine power until the low battery failsafe triggers again. Reducing the throttle to idle and back up also gives normal power, but is not ideal if you’re in the air as you’re also dumping collective when you do this. If you land, you will be able to take off again with normal power because you’ve throttled back, but avoid this at all costs once the model is on the ground shut it down right away and walk to retrieve it as the receiver battery is almost dead.
Push Func + 3 more times to get to the Sen screen (sensor percentage). If you’re using the gv-1 sensor with the supplied magnets or aiming the sensor to the engine crankcase where the flywheel is, you want to get as close to 97% on the sensor as you can. The gv-1 will work with at low as 62%, but a higher percentage is easily obtainable if you move the sensor around to the right position. If you’re using a stator gator, this screen will not function properly and you must start and idle the engine and look at the rpm screen (default screen when you power up the gv-1) to see if there are rpms indicated showing that the stator gator sensor is working.
Hidden Menu settings:
Press the Func + and – together and then power up the model. If you’re successful, you should see Version 1.20 on the gv-1 screen. If you see 0rpm, then you didn’t enter the hidden menu, repeat the process until you do.
Once in the hidden menu, press the func + screen until you see LmHv 20%. On this screen, use the Data – key to lower the value from 20% to 0%. Press func + once more, and you will see Glmt 35%. Again, use the Data – key to lower this value to 25% if using a Spectra-g or 30% if using a 1005 gasser. Those numbers work best for me.
Once done, power off the model to exit the hidden menu and your programming is complete.
When you go fly, if you have to change the throttle atv's to get a better idle for example then you need to go back and relearn idle limits for the gv-1. An easier way around that is to adjust the linkage and that will not effect the gv-1 programming.
Note that this document assumes you’re using a JR radio like I do.
-=>Raja.
1005 Gasser, G26 3DMax++, 2205+ flights
Spectra-g, G26 3DMax, 870+ flights |
Mine is pretty much as out of the box with gain adjusted, travel and in 3D mode, don't know if you ever mess with the other stuff on a gasser or leave alone?
