K 140 G Settings
06-22-2013, 04:59 PM
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K 140 G Settings
Hello Barry,
,
Spent a day at the Field with a friends new K 140 G in a Rookie.
Wow , the engine goes hard. Ballistic is a understatement and we had the engine De- Rated.
We do have some questions though,
1, Can we reduce the idle RPM to 31,000 to limit the residual thrust without any issues ?
2, The Idle RPM seemed a little unstable, it floated between 29,500 + 33,000 at the 31,000 idle thrust setting. is this normal ?
3, How is the best way to stabalize the idle RPM
4, Battery is 9.9 volts , should we try a 7.4 Volt Battery ? Some of our club members recomended a 7.4 volt Lipo which works well with the Xicoy ECU.
On the last landing the engine RPM climbed without a stick command and I overshot the runway. Engine was set at Half Expo and we have now changed to full expo.
With so much power, in a small airframe we are trying to make the set up as forgiving as possible.
Regards
John
,
Spent a day at the Field with a friends new K 140 G in a Rookie.
Wow , the engine goes hard. Ballistic is a understatement and we had the engine De- Rated.
We do have some questions though,
1, Can we reduce the idle RPM to 31,000 to limit the residual thrust without any issues ?
2, The Idle RPM seemed a little unstable, it floated between 29,500 + 33,000 at the 31,000 idle thrust setting. is this normal ?
3, How is the best way to stabalize the idle RPM
4, Battery is 9.9 volts , should we try a 7.4 Volt Battery ? Some of our club members recomended a 7.4 volt Lipo which works well with the Xicoy ECU.
On the last landing the engine RPM climbed without a stick command and I overshot the runway. Engine was set at Half Expo and we have now changed to full expo.
With so much power, in a small airframe we are trying to make the set up as forgiving as possible.
Regards
John
06-22-2013, 06:30 PM
#2
RE: K 140 G Settings
John,
Yes, you can reduce the idle to 31,000rpm
Try to relearn RC. When you get to "stick up - trim up" make sure you are pressing the + or 4th button from the left to advance to the next steps of the radio set up and not the up arrow or #2 button from the left. You will only press the #2 or up arrow button when you get to the half expo and press the #2 button to exit the set up and save the settings.
What is your pump limit set at in the run menu? I have a feeling it is set over 500, you could have a very strong pump and you don't need the power set that high. That could be causing the hunting for idle. I would set the pump limit to 380 before you relearn RC. On the first start, let it idle until it stabilizes, then go full throttle and let it run until it reaches your peak RPM you have set up and stabilizes.
Stay with the 9.9V battery, 7.4 will not have the stamina to give you multiple flights. It takes a minimum of 8V under load to start our Kero start turbine and the 7.4 pack fully charged will only give you a cpl starts. 7.4V packs work great for propane start turbines.
Hope this helps,
Dirk
KingTech Service
Yes, you can reduce the idle to 31,000rpm
Try to relearn RC. When you get to "stick up - trim up" make sure you are pressing the + or 4th button from the left to advance to the next steps of the radio set up and not the up arrow or #2 button from the left. You will only press the #2 or up arrow button when you get to the half expo and press the #2 button to exit the set up and save the settings.
What is your pump limit set at in the run menu? I have a feeling it is set over 500, you could have a very strong pump and you don't need the power set that high. That could be causing the hunting for idle. I would set the pump limit to 380 before you relearn RC. On the first start, let it idle until it stabilizes, then go full throttle and let it run until it reaches your peak RPM you have set up and stabilizes.
Stay with the 9.9V battery, 7.4 will not have the stamina to give you multiple flights. It takes a minimum of 8V under load to start our Kero start turbine and the 7.4 pack fully charged will only give you a cpl starts. 7.4V packs work great for propane start turbines.
Hope this helps,
Dirk
KingTech Service
06-22-2013, 10:40 PM
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RE: K 140 G Settings
Hello Dirk,
Thanks for the quick reply. We checked the Pump Limit setting and it was 452. We then changed it to 380 and did one quick start in the backyard. Initially the RPM seemed a little more stable, but after running it up to 113,000 RPM [Max Limit set to 115.000] it started hunting for idle again.
Could it be a pump issue ?
Regards
John
Thanks for the quick reply. We checked the Pump Limit setting and it was 452. We then changed it to 380 and did one quick start in the backyard. Initially the RPM seemed a little more stable, but after running it up to 113,000 RPM [Max Limit set to 115.000] it started hunting for idle again.
Could it be a pump issue ?
Regards
John
06-23-2013, 01:24 AM
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RE: K 140 G Settings
Hello Barry,
Pump Voltage was 0.49v giving 30,500 and then it changed to 0.52v which was around 32,750 after reving the engine up. The engine seems to hover above and below the set RPM by around 1,500 RPM.
Regards
John
Pump Voltage was 0.49v giving 30,500 and then it changed to 0.52v which was around 32,750 after reving the engine up. The engine seems to hover above and below the set RPM by around 1,500 RPM.
Regards
John
