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Old Nov 16, 2010, 12:13 AM
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I'm a little confused. Maybe the MTOW should be the maximuim weight that the motor combination can fly safely. That number should always stay the same for a given configuration. Then I think people can put their TOW (actual takeoff weight) with a normal payload which should always be less than the maximum takeoff weight.
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Old Nov 16, 2010, 12:23 AM
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Nashua NH
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That's what I think would be best. That way we can choose our frame/gear around the motors or the other way around.

Or at least have a good idea of what the electronics are capable of.
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Old Nov 16, 2010, 12:33 AM
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San Marcos, TX
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I am pretty sure not many folks are going to take the time nor have the ability to figure out their multi-rotor copters true weight capacity. You would need an onboard meter and then gradually add weight until you reached your maximum amp draw. Then we have to decide whether this number is at hover or when gunning during ascent? I know I don't have this capability and simply use the motor and esc temperature check method for what I am flying with. If I can hold my hand on my motors and esc's for 5+ seconds after a loaded flight then I consider it to be in good shape.

So maybe I just change the column name to TOW?
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Old Nov 16, 2010, 02:49 AM
um.. yeah, I can make that fly
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United Kingdom, Milton Keynes
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Well instead of TOW the one I see ALOT of people use in the forum is AUW (all up weight)

CJ
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Old Nov 16, 2010, 09:43 AM
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USA, FL, Winter Springs
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A good relative gauge of how much weight lifting capacity you have left is your throttle position at hover. I aim for a maximum of 50% hover throttle which gives you approximately 2:1 power to weight ratio. You can probably push it to 60% for maximum payload, but I wouldn't go beyond that.

Of course this method doesn't help if you are over drawing your batteries or ESCs, but assuming you have plenty of capacity it can help you find your ideal setup. More than a couple times I was able to add more battery capacity using this method which gave me an additional 5 minutes of flight without removing other weight.
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Old Nov 16, 2010, 09:56 AM
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San Marcos, TX
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Quote:
Originally Posted by Carlos230023 View Post
Well instead of TOW the one I see ALOT of people use in the forum is AUW (all up weight)

CJ
Too funny! I have been through the AUW definition debate before as well.

Take a look at the spreadsheet and let me know if the weight fields and their related fields suffice? I think we could go back and forth for a while about this if we wanted but lets see if what we got will work.

Please consider contributing.

Thanks to all!

Shawn

Hoverfly/Quadpowered harware spreadsheet
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Old Nov 16, 2010, 10:03 AM
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Quote:
Originally Posted by S11D336B View Post
A good relative gauge of how much weight lifting capacity you have left is your throttle position at hover. I aim for a maximum of 50% hover throttle which gives you approximately 2:1 power to weight ratio. You can probably push it to 60% for maximum payload, but I wouldn't go beyond that.

Of course this method doesn't help if you are over drawing your batteries or ESCs, but assuming you have plenty of capacity it can help you find your ideal setup. More than a couple times I was able to add more battery capacity using this method which gave me an additional 5 minutes of flight without removing other weight.
Great way to estimate as well! I definitely do this too but just don't really think about it much since I really only do it when I have added some sort of weight. On my Futaba TX I know that if I am able to hover fully loaded at about 1/2 to 1 line below mid throttle I am in good shape.
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Old Mar 09, 2011, 10:31 AM
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Howdy All,

I wanted to bring attention again to the spreadsheet I started a while back containing information/specifications about peoples copters and hardware they are using. I have a lot of people contacting me lately about what they should get. It depends. You need to think about what your goals are with that copter and what level of experience you have. This spreadsheet will help you make some of those decisions and it would be nice if after you get your copter flying to contribute your info to the spreadsheet.

Go back to post #1 of this thread for more info. You should also scour the multirotor forum and definitely check out the Mega Link Index.

Go to these resources first and then if you want to ask me a question go for it! I'm happy to help as best I can. (I'm not mad at anyone for contacting me, but time is precious with a 4 month old and 8 months to finish my dissertation!)

Thanks,

Shawn
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Old Mar 09, 2011, 11:29 AM
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Old Mar 09, 2011, 04:51 PM
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Thank you!
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Old Mar 10, 2011, 12:02 PM
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spreadsheet updated
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Old Mar 10, 2011, 12:05 PM
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MS, United States
Joined May 2008
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Info added for my UFO
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Old Mar 14, 2011, 12:16 PM
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San Marcos, TX
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Thanks to all who have contributed so far!

I have decided to open the spreadsheet up to anyone who wants to contribute. You no longer need to contact me so I can add you to the user list. I hope this will encourage more folks to participate too.

Best to all, Shawn
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Old Mar 17, 2011, 01:45 AM
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updated : )
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Old Apr 12, 2011, 04:36 AM
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Shawn, this spreadsheet is a big help. Thanks
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