Author Topic: Mavic 115% Build  (Read 4346 times)

Offline KDan

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Re: Mavic 115% Build
« Reply #15 on: December 04, 2017, 01:40:01 PM »
Also, have you adjusted any PID values? Default values sometimes work OK, but sometimes not. How is the copter flying? Is it flyable at all? Is it erratic, or just "mushy".
-Greg

Offline Papajohn88

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Re: Mavic 115% Build
« Reply #16 on: December 04, 2017, 02:05:20 PM »
Thanks KDan, I am trying to work out a way to mount the ESC somewhere other than vertically next to the flight control, I think if I forego the power switch I had installed at the rear and perhaps relocate the sonar module I can put the 4-in-1 ESC behind the flight control.  You can see where I had the ESC mounted in the first photo above. I am printing a mount for the ESC and a spacer to fit under the flight control that will also provide some wire guide channels for the motor wires going to the front arms.  if I can find some brass or copper foil I will put a shield between the bottom of the flight control and the above mentioned spacer.  I will ground the foil to the negative side of power.  This almost has to be and RFI problem, the Arducopter FC has been flown in two other drones with no problems.
John Guenther
Anderson, Indiana
U.S.A.

Offline Papajohn88

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Re: Mavic 115% Build
« Reply #17 on: December 05, 2017, 03:31:00 PM »
I printed my replacement base last night and modified the read legs to provide a way to mount the speed control and flight control end to end in the body.  I had to give up my power switch for the time being in the effort to make things work better and hopefully solve the problem I have been having.  I also now have a 30mm 12vdc fan located in the front of the base similar to the real mavic.  I will print the right rear arm today and hopefully have it ready to fly later today.  If this does not solve the problem I guess it will be time to order another ESC or perhaps go to 4 separate ESC's mounted in the arms.  The attached photo shows how I have the speed control and flight control mounted. 
John Guenther
Anderson, Indiana
U.S.A.

Offline iRazoR

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Re: Mavic 115% Build
« Reply #18 on: December 06, 2017, 06:59:32 AM »
Looks very nice and clean wiring. Good job!  ;)
I hope you have more success now.

I also didnt knew that the original Mavic has a fan inside. I like the idea especially because some components get very hot. If I have space after I put everything I might put also a fan inside.
- David

Offline Papajohn88

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Re: Mavic 115% Build
« Reply #19 on: December 06, 2017, 06:24:04 PM »
iRazoR, Thank you.  The fan is a left over from a hot end upgrade on my 3D printer.  It is 12 volt and hooked directly to the output side of the power module for the Arducopter 2.8.  It draws very little power, just moves a small amount of air but any movement will help when hovering.  I have also noticed my compass is off by 45 degrees consistantly.  I am thinking it is a crappy compass / gps module.  It might be time to replace it with a Ublox NEO M8N GPS with a better compass module too.
John Guenther
Anderson, Indiana
U.S.A.

Offline mils24

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Re: Mavic 115% Build
« Reply #20 on: December 11, 2017, 08:07:05 AM »
Hey Papajohn88, great work.

I am new to this forum specifically to see your build as I too am planning to build a clone with an Arducopter board.

One question however, if you printed the mavic at 115% what ball plungers did you use? If you glue them in can they be recovered when/if crashed?

Also what is your final weight? did going to 115% hurt the weight too much?

Offline Papajohn88

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Re: Mavic 115% Build
« Reply #21 on: December 11, 2017, 12:30:52 PM »
Welcome to the forum mils24.  I used the 6mm plungers in this one, the next one I plan on using 7mm plungers.  Using 6mm plungers when you scale it up requires modifying the holes for the plungers to the correct 6mm size.  I actually think the next one will be scaled to 116.5% which should allow 7mm plungers to be used easily.

Scaling up will increase the weight some, with the 3000mah battery, br2216/980kv motors, apm 2.8 with the gps and power module, maxbotics sonar and the fan mine weights about 978g.  When you scale it everything gets scaled including wall thickness on the base.  I printed mine at 30% infill on everything except the arms.  I printed the arms and feet at 70% infill and the latch at 100% infill.  The screws and nuts used to fasten the body together and mount the arms are 4mm. 

I think it will fly just fine when I sort out the problems I am having with the APM 2.8.  I have flown the APM 2.8 in an F450 quad copter with no problems however I am having problems with the compass and GPS with it mounted in the Mavic.  The internal compass in the APM 2.8 works fine however the external compass included with the GPS receiver is not working very well.  it seems to be off by 45 degrees.  I have tried calibrating the compass multiple times and even did a factory reset and reload of the firmware which did not correct the problem.  I plan on spending today trying to sort it out.

John Guenther
Anderson, Indiana
U.S.A.

Offline CdRsKuLL

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Re: Mavic 115% Build
« Reply #22 on: December 19, 2017, 08:28:11 AM »
I love your cooling fan :-)  great idea. it's amazing what you can fit with that little bit more room.  I've uploaded the middle section to the post you asked for it in, sorry it took me so long.

Steve
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Offline Papajohn88

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Re: Mavic 115% Build
« Reply #23 on: December 19, 2017, 01:51:42 PM »
I am not sure how much the fan helps and given the extreme nose heavy problem I have I hope I can keep it.  The wheel base of the 115% Mavic Clone is 405mm, if the center of balance is the center of the wheel base then the basic design is nose heavy.  This is easy to correct if you are able to design electronics that concentrate the weight in the rear of the body.  It currently needs about 63.5 grams or 2.25 ounces of weight at the rear of the base to balance it on the center of the wheel base.  I have done lots of research on where the center of balance should be or is on the original Mavic and have not found much if anything.  I hope to be able to move things around, mostly further back in the base to balance it without adding lead weights to make it balance. 
« Last Edit: December 19, 2017, 02:19:39 PM by Papajohn88 »
John Guenther
Anderson, Indiana
U.S.A.

Offline jkaechler

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Re: Mavic 115% Build
« Reply #24 on: February 06, 2018, 10:00:25 PM »
papajohn88, do you have a set of files for that 115% build?  That looks like something I might like to mess about with.  8)

Offline Papajohn88

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Re: Mavic 115% Build
« Reply #25 on: February 07, 2018, 02:12:59 PM »
jkaechler:  Yes I have a set of .stl files for the 115% mavic clone.  All of the fasteners used to assemble the body are 4mm, I will get a hardware list together.  I need to modify the base to remove my AMA and FAA numbers from the bottom.  It is currently set up for the Pixhawk mini and a hobbywing 4-in-1 20amp ESC.  I  just made some modifications to the base for telemetry antenna mounting, power switch mounting and a side opening for the Pixhawk Mini USB connection.  It still uses the 6mm ball plungers for the arms.  I will let you know as soon as I get the files ready and get permission from CdRsKuLL to distribute them.
« Last Edit: February 09, 2018, 09:45:49 PM by Papajohn88 »
John Guenther
Anderson, Indiana
U.S.A.

Offline jkaechler

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Re: Mavic 115% Build
« Reply #26 on: February 16, 2018, 06:46:29 PM »
jkaechler:  Yes I have a set of .stl files for the 115% mavic clone.  All of the fasteners used to assemble the body are 4mm, I will get a hardware list together.  I need to modify the base to remove my AMA and FAA numbers from the bottom.  It is currently set up for the Pixhawk mini and a hobbywing 4-in-1 20amp ESC.  I  just made some modifications to the base for telemetry antenna mounting, power switch mounting and a side opening for the Pixhawk Mini USB connection.  It still uses the 6mm ball plungers for the arms.  I will let you know as soon as I get the files ready and get permission from CdRsKuLL to distribute them.

For what its worth, I would like to use the larger build with the 6mm plungers.  That way i dont have to order new ones.  They take a loooong time to come in the mail.  I will be using a 20A 4-1 ESC as well, and a Naza lite with its GPS puck on top of the nose.  I just ordered a much smaller reciever module, and i am working on how to fit the gimbal control board, the esc, and the runcam split board all in the nose area.