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Post by greenb on Feb 1, 2014 15:23:55 GMT -6
Jyotsna are you going to order the parts for the quadcopter? I've been waiting for other STEM club members to say where they would like to see this project go but this forum is pretty quiet.
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Post by jojomagani on Feb 1, 2014 17:06:51 GMT -6
So if you were on that email list i sent a list of parts I think you guys should have. If you want to add anything or remove anything from that list. Let me know. If you did not receive an email let me know.
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Post by jojomagani on Feb 1, 2014 18:57:28 GMT -6
Please look at these cool videos and additional resources which will explain a lot of unanswered questions that you have! I am very excited that all of you guys are interested in this. I have also attached the materials list for the quad copter. The website that helps you understand everything! copter.ardupilot.com/wiki/introduction/Very simple overview droneflyers.com/2012/02/drone-101-what-is-a-quadcopter/Cool Videos to get you guys excited! Please let me know if you have any other questions! Thanks, Jyotsna Magani |
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Post by Dan on Feb 5, 2014 12:46:03 GMT -6
What if we did something like this? a smaller quadcopter.
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Post by Dan on Feb 5, 2014 12:47:52 GMT -6
What if we did something like this? a smaller quadcopter. perfect a smaller one first then make a larger one that could hold a gopro or nerf gun haha |
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Post by shmueldukes on Feb 7, 2014 17:01:22 GMT -6
That sounds awesome! It would be so much fun if it had some kind of nerf gun on it :b
these look so cool.
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Post by jojomagani on Feb 7, 2014 20:07:49 GMT -6
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Post by greenb on Feb 7, 2014 20:34:34 GMT -6
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Post by greenb on Feb 8, 2014 11:53:37 GMT -6
I apologize if I have offended anyone during the last few weeks, during discussion I tend to act like a jerk but I care deeply about the success of this project and I feel that it is important that we all work together to complete this project. I have a test on Monday so I have limited time to create the theoretical quadcopter layout. If anybody wants to find the data sheets on rc brushless motors, that would be beyond helpful. There should be some kind of graph with rpm, load, and amperage draw. It is important that we look at several different sized motors because it is not likely that we will find the idea motor on the first try. I continue to look forward working on this project but I don't want to do all the design work myself. When it comes to programming however, I feel that I am capable to program the quadcopter with the help of the other programmers in STEM club. If any engineering major's wants to jump on the quadcopter design, i'll be more than willing to help them. remember, this project might seem difficult but this is testing are real world skills. It is important that we are combining all are strengths to overcome are weaknesses.
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Post by greenb on Feb 8, 2014 15:00:55 GMT -6
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Post by Josh on Feb 8, 2014 20:32:29 GMT -6
So lets think about this a bit of a different way.
If we assume that the quadcopter and cargo are going to weigh 2kg how large of motors, props and frame are we going to need to get this to work?
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Post by greenb on Feb 12, 2014 23:26:51 GMT -6
(this is the second time I typed this thing out because chrome is not playing nice, i lost 3 hours of work and I am having problems with the images) First I calculated how much the U of M quadcopter weighs, this is 1277 grams. I then used a eCalc simulation with this weight and approximate motor with Pconst estimates to produce an accurate model. eCalc screamed at me until I reduced the all up weight to 1090 grams so that the quadcopter could hover at 81% throttle. Alright, this seems weird so lets do some math. go to the link below for the Turnigy - 2217-20T motor. Scroll down to the bottom of the page and see all the experimental data for various prop sizes. Find the 8 x 4 prop with the maximum thrust, this will make up for the fact that it is not a 8 x 4.5 prop. The maximum thrust is 412 grams per motor. lets solve with 1277 grams first Required Thrust per motor = ( Weight x 2 ) / 4 Required Thrust per motor = ( 1277 g x 2 ) / 4 Required Thrust per motor = ( 2554 g ) / 4 Required Thrust per motor = 638.5 grams Ok, lets solve for the weight of the quadcopter, using the maximum thrust of 412 grams per motor. 412 g = ( weight x 2 ) / 4 1648 g = ( weight x 2 ) 824 g = weight Alright, so lets say we want to carry a GoPro The HD HERO2 camera weight is broken down as follows: Camera & Battery = 3.5 oz ------------------------------> about 100 grams Camera, Battery, & Housing = 6.7 oz --------------------> about 190 grams Camera, Battery, Housing, & LCD BacPac = 8.1 oz --------> about 230 grams Camera, Battery, Housing, & Battery BacPac = 8.6 oz ----> about 244 grams Alright, If you look at the propeller information for the Graupner SF 8x4.5 prop, you will notice that the prop produces 700 grams of thrust at 9k rpm. It is possible that more thrust could be made but it would be more efficient to use a bigger prop. at the end of the day use this motor hobbyking.com/hobbyking/store/__18154__Turnigy_Aerodrive_SK3_2830_1020kv_Brushless_Outrunner_Motor.html and every other parts on your excel sheet should be ok. If anybody has any questions, please ask me. I am here to help. p constant aircraft-world.com/prod_datasheets/hp/emeter/hp-propconstants.htmU of M prop info www.flybrushless.com/prop/view/169motor Turnigy - 2217-20T www.flybrushless.com/motor/view/74 U of M  new design  |
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