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mCP X Brushless Mods Blade Micro CPx Brushless Mods and Conversions |
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11-19-2014, 10:09 AM | #1 (permalink) |
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Join Date: Aug 2013
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Lots of bogging on HP05s
Alright Helifreak troubleshooters. I need some help figuring out what is going on here. So here's the back story:
I have a double brushless mcpx with XP-12A/HP05s 14000kv 8t main and MX-3A/HK 12000kv tail. Now previously I first set this bird up with a spin 16000kv motor and an XP-7A esc. It was working great with solid pitch pumps and excellent power. I bought some RKH rear frame pieces and did a force fit with my MH frame so I could use the superior RKH tail mount piece. I didn't notice it at first, but this caused the spin motor to come into contact with the right servo frame just slightly. What I did notice is that the helicopter came down warm and smelling like burning plastic. I also noticed that the motor wires coming out of the stator and going to the esc were being pulled from the front of the heli to the back after a flight (before the flight the wires were coming out of the motor toward the front of the heli and at the end the were pulled toward the back of the heli). I thought maybe I'd messed up the motor so I swapped in the brand new HP05s directly from oversky, but had the same results. Inspection of the esc made it look like I had damaged some of the fets where you solder the motor wires. I thought this could explain the smell and heat, so I figured the esc was the problem. I just got the new XP-12A esc and put it on last night with the HP05s. I have new (5-8 clean flights) hyperion batteries with micro T connectors. Everything is directly soldered. Both escs are flashed with the latest v12.1 BLHeli code. The tail is has stock settings. The main is gov setup 70% with the only other preset changed for startup power to 1.25 (I did try chaning P and I gains to 2 but I didn't notice any different). Pitch travel is set to 75% up and down. These are basically all of the same settings that were working so well on the original set up. I took it out for a flight and it sounds very boggy on positive pitch pumps. The pumps are very slow rising too. It's like the heli is struggling to gain altitude. Pretty much no change from the problems I'd been having before putting in a new esc. Now that you have the long story, any ideas on what could be going on? The only thing I did rewire was the wires coming from the board to the esc. I had put those on for the XP-7A and the still could reach just fine for the 12A. I don't have intermittent power issues like cutting off or getting a brown out, so I never really considered changing those power wires. My gear mesh looks good (no different than before). The blades spin okay by hand. I'm wondering if I bent the frame so that it's causing drag on the main shaft? Now that I put the MH rear frame pieces back on, everything looks right again and I don't have any binding with the main shaft when I take off the main gear and spin the blades. I can still do all of the flips and 3d stuff I want to do, but I just don't have the climb out power that it should have and that makes it harder to pull out of mistakes. I'd like to get this back to good working order, but I'm just not sure how. |
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11-21-2014, 03:53 PM | #2 (permalink) |
Registered Users
Join Date: Aug 2011
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I have this same issue. New xp7, same, new hp05,same, new batts, same. I have an xp12 but havent given it any thought recently
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11-21-2014, 04:43 PM | #3 (permalink) |
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Thread Starter
Join Date: Aug 2013
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Hopefully someone out there has an idea. I've not had a chance to redo the solder job on the power connection from the esc to the board. I should also make sure the signal wire is soldered properly on the resistor tap on the back of the board. Other than that, I can't really think of what I might have done. I just got an aerolian xp-7a from Banggood yesterday. I might wire up one of those and see what happens. Otherwise, I'm stumped.
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11-21-2014, 04:46 PM | #4 (permalink) |
Registered Users
Thread Starter
Join Date: Aug 2013
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Another question just out of curiosity. When you all get an esc, do you take off all of the old solder and put on your own.? On the MX-3A, no matter what I did with the solder it came with, I got flat/dull joints. I took off all of the old stuff and used the 63/37 lead solder from Radio Shack and everything came out nice and shiny. Is this standard practice or is this overkill?
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11-21-2014, 04:52 PM | #5 (permalink) |
Registered Users
Join Date: Aug 2011
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Do what it takes to look good. I just add more
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11-26-2014, 09:58 AM | #6 (permalink) |
Registered Users
Thread Starter
Join Date: Aug 2013
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Problem seems to be solved now. I thought I'd post a follow up for posterity. As best I can tell, here's what happened.
As I mentioned in my original post, I forced on rakon rear frame pieces onto my MH advanced x frame so I could use the rakon tail boom mount that I like so much better. While, I was able to get it all screwed in, it ended up forcing the bottom bearing mount up a little. This in turn pushed the right side front frame forward slightly. This caused the bottom left servo mount part to rub the motor slightly. I'm not sure, but I think that the result of this was the motor drawing too much power and damaging the XP-7A esc (which I learned is a little under powered for the spin 16000). The esc still allowed the motors to run but with much less efficiency and power over all. I put on the XP-12A with the HP05s motor and things were still bogging badly. I think it was just my soldering job...I had difficulty getting the original power wires off the board and uses a tiny .7mm drill bit to open up a hole in the solder. I know that's terrible, so I'm a bad sinner because of it. In any case, I noticed that I didn't really get enough solder flowed around the hot lead and filling up the hole on the board. I took it all off and redid it. I put the spin 16000 back on and made sure all of my connections were solid and shiny. I also had to file down the servo mount a bit to give the spin 16000 a bit more space. Everything seems good again. The best part is that I have micro deans connectors now. I really can tell a difference between the deans and the XP-12A. Head speed sounds consistent throughout the battery and through flips and rolls. Before my tail was solid no matter what I did. Now it kicks tail right slightly (nose left) on a pitch pump. I'll mess with it more, but it's like the tail isn't able to handle the main now. It took a bit of work and troubleshooting, but thanks for all of the help and great info throughout the site. |
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