Replies to This Discussion

Permalink Reply by roger on February 26, 2012 at 5:36am

Adam,

You indicated the "Nemesis" has a maximum lift of 10 kg and with the supplied batteries can last 45 minutes with the camera you using.

Questions:

1. What's the flying weight of the octo with everything (i.e., electronics, frame, batteries, etc) except camera?

2. What's the weight of the camera you were using in the sentient video?

3. Maximum amount of payload will be the difference of 10kg and the answer to the 1st question, right?

Thanks.

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DeveloperPermalink Reply by Adam Rivera on February 26, 2012 at 8:52am

Roger,

I am hoping to do a max payload test today in a gymnasium with no wind so I can get more accurate figures for everybody. I am using a GoPro camera which is very light to get longer flight times.

1. Flying weight is 15.6lbs / 7.076kg. That is including everything but the camera (APM, telemetry, wireless video tx, 2 x 7800mah batteries, props, landing gear, etc)

2. I use one of two cameras when filming. Either I use the GoPro (.37lbs / .167kg) or my Canon T3i (1.73lbs / .783kg)

3. I will post an exact figure and video to this forum when I run the test today using 3s batteries. I should also note that it will also depend on the batteries you run. If you stick with 3s you will have great motor efficiency but reduced payload. 4s batteries will provide more lift but at a reduced motor efficiency. The theoretical static thrust output of the Nemesis running 3s batteries is 25.5lbs / 11.6kg with 82% efficiency. The theoretical static thrust output of the Nemesis running 4s batteries is 43.12lbs / 19.6kg with 80% efficiency.

As I stated in the previous comment... Is the Nemesis capable of lifting that weight? Yes... but it is not a practical scenario because the flight time would be quite short.

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Permalink Reply by roger on February 26, 2012 at 6:33pm

Adam,

Will be looking forward to the results of your test.

Meanwhile, Using a gopro or canon, the overall flying weight considering everything are 7.243 and 7.859 kgs. You indicated lifting 7.243 kg (go-pro configuration) you got 45 minutes flying time. With the canon configuration, what's your observed flying time?

Thanks.

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DeveloperPermalink Reply by Adam Rivera on February 27, 2012 at 8:31am

Roger,

Unfortunately I did not have time for the payload test this weekend. I was busy preparing for some volunteer work for a non-profit search and rescue organization. Sentient Drone is going to volunteer the use of a Nemesis for searches using thermal imaging from above. I have one last prep flight before a mock search and rescue next weekend. I will try to get a payload test for you at that time using the 3s batteries, but I imagine it will be pretty close to the theoretical values.

Thanks,

Adam

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