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mCP X Brushless Mods Blade Micro CPx Brushless Mods and Conversions


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Old 05-09-2012, 03:24 AM   #21 (permalink)
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Here's a better price for the same size double sided copper clad circuit board. I get all my circuit board etching supplies here also.

http://www.circuitspecialists.com/530-lf.html
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Old 05-16-2012, 01:48 PM   #22 (permalink)
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Just wanted to say thankyou for posting all this great info.
You have made converting to blheli much easier to understand
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Old 05-20-2012, 02:43 AM   #23 (permalink)
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Thank you for the great writeup. I just put a hp06v2 on my v2 this week. The arm gov mode w/curve really made a difference. Throttle pumps are really solid now.
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Old 06-03-2012, 04:55 AM   #24 (permalink)
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Default So much for the 8T

My hp06v2/9T/governed-6000rpm setup has been running fine for me. I've tried different max pitch settings and I've settled with 75% (11-ish degrees) and I've always wondered if the max pitch is limited by motor torque. I've always wondered how a 8T would change things. My 1.5mm bore 8Ts have finally arrived from Astroid Design a few days ago. Haven't got a chance to fly until today because of weather.

Finally have good weather to fly at the park today. I'm a bit disappointed not because the 8T pinion exploded on me (yes, not slipped but exploded because all the pinion glue is still on the shaft) but because of 8T performance. First, headspeed doesn't stay more constant with the shorter gearing for more torque. Second, I found out that beyond 12 degrees of pitch the main blades start to generate lift inefficently. That means although I can get more lift turning up max pitch from 11-ish I get exponentially more bog to go with it. So in the end, 75% pitch travel (11-ish degrees) is still the sweet spot for max pitch regardless of motor torque. And that translates to no matter what pitch and headspeed setting, I cannot get better full-pitch pump performance or tic-toc performance from 8T than 9T with my hp06v2. Maybe I'll revisit 8T on hp06v2 in the future, but it'll most likely not be 1.5mm bore.

I wished after trying out 8T I would be able to say there's no substitute for torque. Instead, I have to say I'm so much more impressed with BLHeli governor performance to make 9T run better than 8T on hp06v2.

[ame]http://www.youtube.com/watch?v=LIn62nSAXC8[/ame]
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Old 06-03-2012, 05:14 AM   #25 (permalink)
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At least it happened 1' off of the ground. I'm glad you posted your 8t vs 9t experience because I've been thinking about the best set-up to run on my mini cp. I have 7, 8 and 9t pinions and a 61t main gear. Right now I'm using the 8t with a hp05s at 100% throttle with a headspeed of 8,150 and roughly 60% pitch. I've been wondering what would be best, a lower head speed and more pitch, a high headspeed and less pitch or somewhere in between. I really like the way the mcpx non-bullet blades sound at 8,000 rpm on my Mini though, lol. How did you determine that the blades lose efficiency after a certain pitch? Also, are they less efficient above a certain rpm?
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Old 06-03-2012, 05:12 PM   #26 (permalink)
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Yeah, luckily it didn't happen when I was flying hard and high. Regarding headspeed vs pitch, it depends. Besides lower pitch requirement, high headspeed means more cyclic power and more pop by trading in flight time. Blade/prop starts to lose efficiency beyond an angle of attack not RPM. I could be wrong but from all my testings with main and tail blade pitch, I find 11 degrees the most angle of attack I like to run before efficiency starts to drop exponentially. Of course with a curved tail blade you can run higher pitch on the trailing edge from the curvature, but the leading edge is still best at 11 degrees.
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Old 06-04-2012, 06:26 AM   #27 (permalink)
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Put back on 9T and flew 14 packs today, increasing governor headspeed each pack from 70%, 72.5%, 74%, 76%, 80%, to 88% (full throttle). I think 9T probably bogs a bit more than 8T if I don't handle cyclic and collective good together but that situation is less likely to happen with 9T due to the extra pop and better full pitch climb available. Even with full throttle and 75% pitch travel, I still get 3.73V immediately (and back to 3.78V after sitting for a while) after 4:30 flight time (5:00 by landing) and the motor, ESC, and battery are no more than barely warm. I'll keep the 9T on the hp06v2 and perhaps turn down headspeed a bit since full throttle is a bit too much for my pilot skills for now.

[ame]http://www.youtube.com/watch?v=ZhJ1KuCkXBo[/ame]
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Old 06-04-2012, 07:21 AM   #28 (permalink)
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What's your headspeed at 88%/ full throttle?
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Old 06-04-2012, 07:27 AM   #29 (permalink)
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I don't have a tach but judging by the fact that my hp06v2 maxes out headspeed at around 86%, headspeed is about 7000rpm.
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Old 06-04-2012, 07:36 AM   #30 (permalink)
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Looks great. Thanks for posting the videos. No I just have to do some math to make my 8t pinion, 61t main geared mini relate to yours. I'm getting 8,150rpm with the hp05s and although it is very fast I want more. I have 7, 8 and 9t pinions and 61t and 64t main gears are available but the 64t main gear is a lot flimsier so I'd prefer not to use it.
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Old 06-04-2012, 04:33 PM   #31 (permalink)
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I have tached HP06V2 @ 100% @ 7100rpm
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Old 06-08-2012, 02:53 PM   #32 (permalink)
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Can you gie us any tips on brushless tail setup.

Ive just fitted mine but I could do with some help on how to setup blheli.

I dont think im arming the esc correctly as even with full right rudder its not very powerful.
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Old 06-08-2012, 03:22 PM   #33 (permalink)
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I'll do a write-up on brushless tail setup. Trying to gather FAQs.

Unlike BLHeli main, there's no special arming sequence for BLHeli tail. It's possible you've entered TX program mode inadvertently which usually results in setting the 1st parameter to the 1st value which means reducing tail gain to minimum. If you have connectivity to toolstick, check your tail gain. If not, you'll have to get into TX program mode with rudder stick (with non-zero throttle) like you use throttle stick to get into TX program mode for main ESC and re-set tail gain. Right rudder is full throttle, left is zero. If you have a hard time visualizing that, turn your TX CCW sideways. Rudder stick is now like your throttle stick when you TX-program the tail.

Here's how I arm both main and tail ESCs.

[ame]http://www.youtube.com/watch?v=1FI5iqDijJ0[/ame]
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Old 06-08-2012, 04:31 PM   #34 (permalink)
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I have a toolstick and I've disabled program by tx

I flashed to version 2.4 and the settings are at the defaults.

what blheli version do you recommend?
any settings I should change from the defaults?

I'm using an xp3a and version 1 hpt03t with a matt bockman motor running on a xp12a.
I know the brushless tail isnt needed for this main motor but I already had the motor and once I've got my head around brushless ill upgrade to more power (thinking 2 cell)

thanks for the help.
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Old 06-08-2012, 04:43 PM   #35 (permalink)
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Make sure tail gain is set to 1. Anything lower you'll not get max thrust from that motor. Anything higher OTOH you reach the same max thrust as gain=1.0 just sooner. No preference on BLHeli tail version. They all work fine using default values. The only version-particular problem is with 3.3 that has very muted motor beeps. Not sure what you mean by version 1 hp03t. As long as it's 12-magnet version it should be good. Not sure why you don't get good thrust. Make sure tail prop is not spinning on the shaft. On every brushless tail build I have to CA the prop on the shaft. The 12-magnet motor has more torque than even 120SR tail motor that it will spin the prop on hard acceleration and deceleration, especially with damp mode (default).
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Old 06-08-2012, 04:57 PM   #36 (permalink)
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I'm not at home now so I'm not sure what the gain is set too.

I have glued the prop on.

the motor is the 12 magnet version but it's a few years old, I "think" there is a new version as well.

holding the heli in my hand it doetsn't feel very powerful.
in a hover its holding but any demand on the tail and it just spins.
I can't really test fly it as its unflyable indoors as I don't have much space.

I am running a deep v curve on the throttle which helped with the stock tail, but I don't see how this would cause the lack of tail power.
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Old 06-08-2012, 07:04 PM   #37 (permalink)
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Don't know if this was asked or stated, but what prop are you using on the tail? If it's the plantractor prop, it has to be installed a certain way or you won't have enough thrust. Shiny side blowing in your face is the way to install it.
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Old 06-09-2012, 04:15 AM   #38 (permalink)
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I'm using the stock v2 prop at the moment
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Old 06-09-2012, 04:25 AM   #39 (permalink)
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That's your problem. Stock v2 prop needs a lot of RPM from the small 6mm motor to work. Compare to the stock 6mm motor, the hp03t runs a much lower RPM but much much more torque. It needs a prop that runs about 58-68mm with pretty high pitch profile. The RRC prop works best. Alternatively, Walkera 4G3 tail prop or a cut-down to 59mm 120SR tail prop custom bent for more pitch and progressive pitch profile also work. A non-cutdown or non-custom-bent 120SR tail prop will work marginally. A stock v2 prop has no chance.
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Old 06-09-2012, 04:40 AM   #40 (permalink)
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thanks, I did wonder if the stock prop would be ok as everybody seems to use a rrc prop.
I didn't realise it was essential.
I'll order one now.

in the meantime I'll see what I can find in my spares box that's a bit bigger.
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