Macsgrafs
Active Member
I have put my skylib build on hold, new parts about to be sent out & would hate to have to strip down & start it all again
Ross
And my knees go weak again - the new Droidworx airframe
- Thread starter Gunter
- Start date
I have put my skylib build on hold, new parts about to be sent out & would hate to have to strip down & start it all again
Ross
CopterCam
Member
I have put my skylib build on hold, new parts about to be sent out & would hate to have to strip down & start it all again
Ross
Ross,
Are you still going with the Emax GT motors ?
Sid
You don't
- 'cos even if you used a big enough cable, there's no connector that would take it. At that level, I guess you have to split the battery packs - say 2 ESCs from each "sub-pack". I guess you could install a big-*** copper bus-bar (like there is inside a domestic fuse box), feed each battery pack onto it separately and take each ESC off it separately. I've been struggling with this issue myself recently. How do other people manage it?
Macsgrafs
Active Member
You don't
I was thinking something along the lines of car battery cable? form it into a continuos loop & take 8 taps off to each ESC!
Ross
blip.com.au
New Member
3kg per motor? What prop?
Droider
Drone Enthusiast
450 amps!!! how you come to that... what are you lifting are you planning something like this?
http://www.youtube.com/watch?v=OM7HHB51WX8&feature=youtube_gdata_player
Dave
http://www.youtube.com/watch?v=OM7HHB51WX8&feature=youtube_gdata_player
Dave
Macsgrafs
Active Member
hahahahaha not quite Dave
I was working on max current per motor being between 50 - 60 amps.Ross
Pano-Dirk
Member
APC 15x4 and 5S LiPo
Pano-Dirk
Member
I'm using two LiPos 5000mAh 5S 40C.
One LiPo for 4 ESCs.
There are two cables (plus and minus) for the first bank (4 ESCs) and two cables for the second bank.
By a maximum of 40 A for evry BL-Ctrl the maximum current is 160 A for one bank. There are high current connectors available for this.
Flying Tivo
Member
Dirk:
Im also contemplating, on building a SJ8, Do you think the BL-Ctrl can handle possible spikes? What brand connectors are you talking about?
Could i PM or email you for more info on the plattenberg motors?
Thanks
Felipe
Im also contemplating, on building a SJ8, Do you think the BL-Ctrl can handle possible spikes? What brand connectors are you talking about?
Could i PM or email you for more info on the plattenberg motors?
Thanks
Felipe
Macsgrafs
Active Member
Felipe, the BL-CTRL can not handle the power needed by the bigger motors on the SJ8!
Ross
Flying Tivo
Member
That what i thought since my numbers did not match using the BL with Axi 4120/20. Do you have the specs for the special plattenberg 15-20 so i can do the math????
Also what ESCs would you be using?
Also what ESCs would you be using?
Pano-Dirk
Member
Maiden flight done:
http://vimeo.com/28371418
The MK Bl-Ctrl can handle up to 40 ampere. With an 5S LiPo 800 watts are possible.
With 8 motors you will have 6.4 KW.
I am using APC 15x4 propellers and the thrust is 3,2 kg per motor.
I will do a test with 5 kg payload in the Next days and will give the details to you.
First I have to configure the PID values and to complete the copter.
This Plettenberg motor is a prototype. Details are coming soon.
Dirk
The MK Bl-Ctrl can handle up to 40 ampere. With an 5S LiPo 800 watts are possible.
With 8 motors you will have 6.4 KW.
I am using APC 15x4 propellers and the thrust is 3,2 kg per motor.
I will do a test with 5 kg payload in the Next days and will give the details to you.
First I have to configure the PID values and to complete the copter.
This Plettenberg motor is a prototype. Details are coming soon.
Dirk
Last edited by a moderator:
Flying Tivo
Member
Very nice! Let me know when the plattenberg info available and availability!
Probably will go with the axi but want to compare numbers!
Thanks
Felipe
Probably will go with the axi but want to compare numbers!
Thanks
Felipe
Wayne Jones
Member
SkyJib8
View attachment 884View attachment 883Here is a very basic question from a multirotor noobs. My background is with helicopters. I have a couple dedicated Maxi Joker 2 camera ships. I feel that the multirotors fill a niche that helicopters can't, i.e. tight flying spaces, near people and to be able to use cameras with cmos sensors.
I have recently purchased one of the Droidworx Cinema Series-C6 prototypes with Axi 2820/14 motors turning 14x4.7 APC sf props, maxing out at 36 amps each. I have not put a watt meter to it yet. I am powering it with the Hoverfly Pro board because read in a forum that the MK controller could not handle the power needs. After building a spider power distribution harness with copper washers and 8 awg wire it flys pretty well with (2x) 4s 5800mah batteries. I've only had about a 3lbs camera strapped to a Photohigher AV200 camera gimbal. I think these aircraft are great and the fact that you can even shoot a good video with a GoPro HD camera, which is tough with a helicopter, makes the use of this exciting.
My main confustion about multirotors is "head speed". If I am correct brushless motors and esc's operate best or most efficient in a certain operating range. These craft being fixed pitch I know that you can't fly in the 75% to 95% throttle range of a collective pitch helicopter but wit 14" props I am hovering, depending on weight, in the 34% to 44% throttle range at hover.
I feel like I am loading the motors and esc's. I saw the "SkyJib8 maiden flight" video and the props did not look like the 15" props that were talked about. They looked mor like 12" or 13" props.
My question is; Should I be changing my props out according to my flying weight of my aircraft so that I am hovering around mid stick (50%) on a linear throttle curve so that I have a more efficient.
Any advice is greatly appreciated. I am trying not to learn the hard way like I did with Helicopters. I have too much money already tied up in this hexacopter.
Thanks,
Wayne
View attachment 884View attachment 883Here is a very basic question from a multirotor noobs. My background is with helicopters. I have a couple dedicated Maxi Joker 2 camera ships. I feel that the multirotors fill a niche that helicopters can't, i.e. tight flying spaces, near people and to be able to use cameras with cmos sensors.
I have recently purchased one of the Droidworx Cinema Series-C6 prototypes with Axi 2820/14 motors turning 14x4.7 APC sf props, maxing out at 36 amps each. I have not put a watt meter to it yet. I am powering it with the Hoverfly Pro board because read in a forum that the MK controller could not handle the power needs. After building a spider power distribution harness with copper washers and 8 awg wire it flys pretty well with (2x) 4s 5800mah batteries. I've only had about a 3lbs camera strapped to a Photohigher AV200 camera gimbal. I think these aircraft are great and the fact that you can even shoot a good video with a GoPro HD camera, which is tough with a helicopter, makes the use of this exciting.
My main confustion about multirotors is "head speed". If I am correct brushless motors and esc's operate best or most efficient in a certain operating range. These craft being fixed pitch I know that you can't fly in the 75% to 95% throttle range of a collective pitch helicopter but wit 14" props I am hovering, depending on weight, in the 34% to 44% throttle range at hover.
I feel like I am loading the motors and esc's. I saw the "SkyJib8 maiden flight" video and the props did not look like the 15" props that were talked about. They looked mor like 12" or 13" props.
My question is; Should I be changing my props out according to my flying weight of my aircraft so that I am hovering around mid stick (50%) on a linear throttle curve so that I have a more efficient.
Any advice is greatly appreciated. I am trying not to learn the hard way like I did with Helicopters. I have too much money already tied up in this hexacopter.
Thanks,
Wayne
Attachments
Wayne Jones
Member
That thing is huge then. How do you transport it without a van? I am very curious about where my best throttle speed should be in relation to motor efficiency.
I am so impressed by these machines. I was tweaking my stabilization a couple days ago and testing my gopro when I flew between 2 houses at the beach. I had maybe 8 feet of space between the shrubery. I flew in, with beach wind blowing at 10-15 mph, like it always does, stopped turned around and flew back by myself and back again out into an open field. I was shocked. I could have never done that with my Maxi Joker 2. The rotor diameter is 6 feet alone. 7 feet total length.
Wow! That alone was impresive to me.
I am so impressed by these machines. I was tweaking my stabilization a couple days ago and testing my gopro when I flew between 2 houses at the beach. I had maybe 8 feet of space between the shrubery. I flew in, with beach wind blowing at 10-15 mph, like it always does, stopped turned around and flew back by myself and back again out into an open field. I was shocked. I could have never done that with my Maxi Joker 2. The rotor diameter is 6 feet alone. 7 feet total length.
Wow! That alone was impresive to me.
What batteries could cope with 6.4 KW? I dont know of any Lipos that could take that discharge rate?
Last edited by a moderator:
I'd recommend using http://www.ecalc.ch/xcoptercalc_e.htm?ecalc - once you've entered all your numbers correctly you can observe the effect of prop changes, battery changes, payload changes, etc. Very cool tool!