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Skookum Robotics Skookum Robotics SK-360 SK-540 & SK-720 Digital Flybar |
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08-14-2014, 03:11 PM | #1 (permalink) |
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Join Date: Jun 2012
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Possible SK540 Issue
I have two 500 size helis. They are identical.....both have a 540 Clear, Futaba SBus receiver and a Kontronik Jive ESC. Both are set up with the "Sport" profile and I've made no changes to the Sport settings. 500 #1 has firmware 3.43 and 500 #2 has firmware 4.0. 500 #1 flies great; however, #2 wants to slowly drift towards nose up in FFF. In addition, when I switch from Idle 1 back to Normal, there is a pronounced, immediate nose pitch downward every time. The Kontronik ESC is connected directly to the Futaba receiver and not to the SK540. I use 0/70/70/70/70 for Normal and 75/75/75/75/75 for Idle 1. After the first flight, I rechecked the swash for level at zero blade pitch and plus/minus 12 degrees of collective pitch. Since I'm using the stock "Sport" settings, none of which are aggressive, I would think I shouldn't have to reduce any settings on any parameter in the software to resolve these issues. I'm stumped. Might anyone have any suggestions as to where I might look to fix this? Thanks.
Mike |
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08-14-2014, 03:59 PM | #2 (permalink) |
Registered Users
Join Date: Aug 2010
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Lower hiller decay if you nose is coming up in forward flight. My 500pro dfc would nose up in forward flight, fff, veryfff. Lowering my decay to 90 fixed it.
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B400(retired),Mini Titan V1(Retired),Radikal G20 (scrapped),Align T-Rex 500pro DFC,Synergy E5s |
08-14-2014, 05:26 PM | #3 (permalink) |
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Join Date: Jan 2013
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Proper CG, proper tail precomp, higher hiller gain on ele and lower Hiller Decay help tuning out nose up in FFF
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08-14-2014, 08:07 PM | #4 (permalink) |
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Thread Starter
Join Date: Jun 2012
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Possible SK540 Issue
Thanks for the inputs. I may wait for the LCD Field Terminal firmware update so I can make changes one at a time, fly, and then determine if the change had any impact on the problem. I don't have a laptop so I'm dependent upon the field terminal. My #1 500 flew great without any changes to the default setup. I was hoping #2 500 would do the same after updating to FW4.0 but I guess some "fine tuning" will be needed. Thanks again.
Mike |
08-14-2014, 08:50 PM | #5 (permalink) | |
Registered Users
Thread Starter
Join Date: Jun 2012
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Possible SK540 Issue
Quote:
Mike |
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08-14-2014, 09:01 PM | #6 (permalink) |
Registered Users
Join Date: Jan 2013
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Yes, tail drag comp. Pitch pump and adjust if tail is ahead or lags as compared to the rotor. Correct, no hiller gain user adjustment in v4, you can turn up the cyclic gain if no other side effect noted. Check/Adjust the parameters in the order I mentioned in my initial post; one at a time
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08-22-2014, 08:45 PM | #7 (permalink) |
Registered Users
Thread Starter
Join Date: Jun 2012
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Possible SK540 Issue
And so the mystery is solved. Two identical 500 helis......one with FW 3.43 and the other with FW 4.0. The 3.43 flies great while the 4.0 pitches up in FFF and is not "locked in" like 3.43. Yesterday evening, I had the SK540 with FW 4.0 connected to the computer and was staring at the SK software window. For some reason, I flipped the condition switch from "Normal" to "Idle 1" and low and behold......the lights came on, the chorus began to sing and the waters parted!! I watched the cyclic and tail gain drop from 50 in Normal Mode to 10 in Idle Up 1 and 2. Apparently, when setting up my Futaba 8FGH, I never programmed the gain settings in the gyro menu for Idle Up 1 and 2. Five decades in this R/C hobby and these beginner type mistakes still get the best of me!! I took the 500 with 4.0 to the field this evening and it flew just great. However, I think I'll wait for the next update from Skookum before updating the rest of my fleet so I can use the LCD terminal at the field.
Mike |
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