M4+BLHeli_ESC+5g brushless+4x2.5
Posted: Mon Aug 31, 2015 1:12 pm
I'm building quad with 100g AUW and Quatos in mind. Planning to use following components:
M4V1
HXM1400-2000 (5grams/2000kv)
BLHeli 3A ESC
4x2.5 props
2s 450-600mAh
+FPV gear
I have build very basic frame with 170mm motor to motor using 6mm carbon tube as arms. Frame weight is some ~30g and it feels quite rigid. So total weight of the copter is now 95-105g depending on the battery used. I have done thrust measurements and 4x2.5 seems to give ~60g of max thurst. In my build I'm using 2s lipo to power motors. For M4 I'm taking power from the first cell of the same pack. As I'm on the diet I'm not planning to use expansion board. I have taken PWM 1-4 from on-board FET gates.
Are there any other builds in this category around? I would love to see parameter files. I have most of the stuff well figured out but some things still need clarification what comes to tuning this bird.
MOT_VALUE2T_A1 and A2 are clear but MOT_VALUE_SCAL needs some clarification. In one posting there was instructions to use the same value what is the maximum PWM when measuring thrust. And then there was also information to use this parameter in the same manner than in Labybird case i.e. to compensate thrust variations due battery voltage drop. So which one is the right way? Is there any other parameters needing tune when upgrading from Ladybird size? I attached print screen from current Quatos settings.
I have airframe geometry .xml file done and also .params generated with online tool. So these are clear.
Are there some other things to consider?
BTW. I upgraded from GroundControl from 1.5.x to 1.6.3 and noticed that old values are using commas but when trying to save it reports error. Do we haveto use point/period from now on? Do we have to generate new param files with this separator?
And then a small video of thrust measurement. I'm using BLHeli ESC controlled by Arduino. Arduino also reads thrust data from HX711 + strain gauge -combo and prints results thru serial terminal. These are then easy to copy-paste to Excel for A1 and A2 calculations.
https://www.youtube.com/watch?v=ChllAJh ... r_embedded
And sorry that I may have asked some of these questions in this thread "Quatos for 234mm Quad X? Thrust curve measurement?" earlier. I just thought to start my own thread not to steel the other one
M4V1
HXM1400-2000 (5grams/2000kv)
BLHeli 3A ESC
4x2.5 props
2s 450-600mAh
+FPV gear
I have build very basic frame with 170mm motor to motor using 6mm carbon tube as arms. Frame weight is some ~30g and it feels quite rigid. So total weight of the copter is now 95-105g depending on the battery used. I have done thrust measurements and 4x2.5 seems to give ~60g of max thurst. In my build I'm using 2s lipo to power motors. For M4 I'm taking power from the first cell of the same pack. As I'm on the diet I'm not planning to use expansion board. I have taken PWM 1-4 from on-board FET gates.
Are there any other builds in this category around? I would love to see parameter files. I have most of the stuff well figured out but some things still need clarification what comes to tuning this bird.
MOT_VALUE2T_A1 and A2 are clear but MOT_VALUE_SCAL needs some clarification. In one posting there was instructions to use the same value what is the maximum PWM when measuring thrust. And then there was also information to use this parameter in the same manner than in Labybird case i.e. to compensate thrust variations due battery voltage drop. So which one is the right way? Is there any other parameters needing tune when upgrading from Ladybird size? I attached print screen from current Quatos settings.
I have airframe geometry .xml file done and also .params generated with online tool. So these are clear.
Are there some other things to consider?
BTW. I upgraded from GroundControl from 1.5.x to 1.6.3 and noticed that old values are using commas but when trying to save it reports error. Do we haveto use point/period from now on? Do we have to generate new param files with this separator?
And then a small video of thrust measurement. I'm using BLHeli ESC controlled by Arduino. Arduino also reads thrust data from HX711 + strain gauge -combo and prints results thru serial terminal. These are then easy to copy-paste to Excel for A1 and A2 calculations.
https://www.youtube.com/watch?v=ChllAJh ... r_embedded
And sorry that I may have asked some of these questions in this thread "Quatos for 234mm Quad X? Thrust curve measurement?" earlier. I just thought to start my own thread not to steel the other one