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Mikado Logo 700 Xxtreme Mikado Logo 700 Xxtreme Helicopters Discussion |
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12-25-2013, 05:46 AM | #1 (permalink) |
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Head speed drop-offs - Help!
Hi guys,
Just finished my 700 Xx and have flown two easy flights so far. On the second, I almost had my heart jump in my throat when I was attempting some stationary flips and it seemed as though my head speed just bottomed out when I went inverted. Needless to say, I am a little worried that something isn't configured right. This is my first 700 size heli, so I know things will be slightly different than my smaller (550) heli, but this just doesn't seem right. I bought the 700 Xx combo, and have attempted to use the recommended settings I've seen posted on the boards. I've only got a DX6i so for normal mode I'm shooting for about 1850 HS and at ID1 it's set for about 2050. I've got quite a bit of experience with Vbar, but this is the first time I've used the Vbar governor function. My previous experience is all with the CC ESC govs. After doing some reading, I confirmed I have the wrong gearing ratio in the Vbar settings (9.722), as I have seen a few posts where people were saying that it should actually be 10.29. I know that will make a bit of a difference, but I still don't know why everything is dropping out when I take it inverted. I pull negative pitch once upright and it immediately picks the HS back up, of course. The only other thing that seemed a little off was that I heard no perceptible change in the motor when switching from normal to ID1. Any input would be greatly appreciated as I want to get this worked out before I attempt any strenuous manuvers. Other than that, I am incredibly impressed with Mikado! This was my first kit from them, and I think I made a great choice. Other than a few minor hiccups with construction, everything went together great and it's a dream to fly. I just hope to get these last few bugs worked out. Thanks in advance, |
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12-25-2013, 07:49 AM | #2 (permalink) |
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Head speed drop-offs - Help!
Are you running flat throttle curves? And what are they?
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Travis(twill) Aircapitalheli.com Xnova motors and kbdd blades |
12-25-2013, 07:53 AM | #3 (permalink) |
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Yes,
I have my normal curve flat at 95% for 1850 RPM and my ID1 curve flat at 100% for 2050. I corrected the gearing ratio and believe that I saw a slight increase (audibly) in the RPM for a flight I just finished, but still no change between N and ID1 (maybe because the change is so slight?), and I still had the drop off during stationary flips for inversions. I checked all my wiring and everything appears to be in order. Just stumped... |
12-25-2013, 09:31 AM | #4 (permalink) |
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Re: Head speed drop-offs - Help!
The gov needs 10% headroom, you have 0 and 5%
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12-25-2013, 10:39 AM | #5 (permalink) |
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Got it. I'll adjust my curves to be 85% and 90% respectively and give it a try.
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12-25-2013, 10:55 AM | #6 (permalink) |
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Just to make sure I'm following right, I've got to increase the max HS requested in the Gov II setup page in order to keep the 2050 HS at 90% throttle on my ID1 throttle curve in the transmitter, correct? I suspect that will have the max HS around 2200 or 2300 in the setup.
This stuff makes since as my other CC govs are maxed at 90% as well. I should've thought of that. I appreciate all the input. |
12-25-2013, 11:29 AM | #7 (permalink) |
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Re: Head speed drop-offs - Help!
Yes. No problem
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12-25-2013, 12:35 PM | #8 (permalink) |
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Thats not how the vbar governor works, with 100% you can still have headroom depending on the max rpm setting
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12-25-2013, 12:42 PM | #9 (permalink) |
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200 rpm difference in Logo 700 (any 700size) should be very noticeable. Something is not right in your setup. With vbar gov, you get different head speed with every single change in the throttle curve. The difference between different mode does not have to be 10%+ apart.
The head speed drop going inverted is a big concern. Is your normal throttle curve flat from point zero to point 5? Is the channel mapped correctly? Check it on the receiver and transom. screens of the vbar setup section. Does your pitch channel somehow mixed with the throttle channel? Governor setup properly? Check out the vBar governor setup video by Mr. Mel. Good luck
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12-25-2013, 03:09 PM | #10 (permalink) |
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Another thing to check is the esc rpm governor adapter.
On my 800 I had it in backwards (connector at vbar ) , darn near knocked it out of sky on first flip. Log was 16 pages of governor errors in about 3 minutes. Check the log , then triple check the connector, following the wires as they go thru adapter and into vbar gov port Martin
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12-25-2013, 03:26 PM | #11 (permalink) | |
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Re: Head speed drop-offs - Help!
Quote:
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12-26-2013, 07:25 AM | #12 (permalink) |
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So,
Tried adjusting the throttle curve... no change. Back to the setup... I have my ESC RPM wire coming from the YGE to the adaptor provided in the kit: orange to black, red to red, brown from yellow jumper to black. This is plugged into the Vbar in the sensor II port (port on bottom when looking down on Vbar) with the red wire inboard and black wire outboard (also when looking down). With regard to the rest of Vbar setup: I just changed the satellite setup to the DSMX 11ms. Previously it was on "digital center" for some reason. For the Gov I and II pages, I followed Mr. Mel's video, but changed the gear ratio to 10.294. I currently have a linear throttle curve set for normal mode. At full pitch/throttle I see 2055 RPM requested by the ESC/gov. When switching to ID1, I have a flat curve at 100% across all 5 points and see 2055 RPM requested as well. The only "change" I just made was switching which satellite mode everything was in, but everything else appears to be the same. This is driving me nuts right now. I appreciate any help that can be offered. |
12-26-2013, 07:29 AM | #13 (permalink) |
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I also pulled the log file and there are a ton of entries, but every one of them says "Antennae Switched."
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12-26-2013, 07:52 AM | #14 (permalink) |
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Pulled and saved the log. There was additional info in it this time. I've not messed with this function before, so I'm still trying to get the hang of it.
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12-26-2013, 08:44 AM | #15 (permalink) |
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The connections are correct on the main unit.
What's the vBar firmware version? What do the receiver and output set to on the first governor page? What's the channel number on the setup-> receiver page? On the main page, the governor shows 2055 RPM requested. What is the actual RPM do you get? When you change the throttle curve to a different value, does the requested value change? Full pitch throttle with the linear throttle curve means the throttle output is 100%. Switching to idle1 with 100% flat you also get the same max RPM in your governor page 2. Try setting your normal curve to 0-85-85-85 and see whether the requested RPM is different.
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12-26-2013, 09:06 AM | #16 (permalink) |
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I've got 5.3.4 pro on my Vbar.
I've pulled the blades off and tried bench testing in Vbar to see if I can get a read on RPM and while the governor is requesting the programmed RPMs, the Vbar is not "detecting" any RPM and still reports the "current" figure as 0/min. I have no other way f testing RPMs. Even with this, however, I am still not seeing a difference between my programmed differences between normal and idle up modes. There is no audible or visible change when switching modes, though Vbar does request the higher RPM when switching. Channel 1 is my throttle from page 1 of setup, and Gov I lists the same thing. Is it possible there is a faulty cable between the RPM sensor leading to the Sensor 2 port which is resulting in Vbar not being able to tell what the motor RPM is? |
12-26-2013, 09:37 AM | #17 (permalink) |
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Fixed It!!!!!!
I started checking my wiring again and cut off the wire braid around the adapter connection and, sure enough, somehow the connection came loose between the two, even though it looked like it was a tight connection. I pushed everything back together (tightly) and ran Vbar again and now the software is picking up the actual RPMs and behaving poperly.
I feel like an idiot, but at least it's functioning appropriately now. Just have to fix my wire braid and wait for the weather to clear as it's now raining. Many thanks to all. Sorry for the bother. |
12-26-2013, 04:36 PM | #18 (permalink) |
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Good you got it sorted , better than any mishaps.
Enjoy the system , it works well. Martin
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Logo XXtreme 800 8917 / 256HV VBC Logo XXtreme 700 on 14s 8917 / 256HV VBC NEO Logo XXtreme 770 14s 8917/9188 VBC Logo 600 8917/ 9188 4035-500 VBC NEO |
12-26-2013, 09:10 PM | #19 (permalink) |
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I would put some hot glue on the connectors at the Vbar and also on the extension connector from ESC to RPM sensor. Just to make sure it doesn't get loose in flight due to vibrations...
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12-26-2013, 10:55 PM | #20 (permalink) |
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Several good methods out there.
Little fishing line tyed thru the connector in line with wiring shrink tubing around connections , my favorite. I also try to pick a connection that is 'stiff' and doesn't easily come apart Martin
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Logo XXtreme 800 8917 / 256HV VBC Logo XXtreme 700 on 14s 8917 / 256HV VBC NEO Logo XXtreme 770 14s 8917/9188 VBC Logo 600 8917/ 9188 4035-500 VBC NEO |
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