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Old Sep 09, 2013, 02:46 PM
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EndOfDays's Avatar
Austria, Niederösterr., Eggenburg
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Project 30mm

Yet another copter is going to be build, the title is according to the diameter of the rods used for this copter. My last project aber 12mm rods can be found here:
http://www.rcgroups.com/forums/showthread.php?t=1880665
This time not the flight time only is the major focus, but the ability to lift a reasonable payload for a reasonable time.
Today I got the first components delivered, the 30mm rods, which have nice quality. The rods are 30/24mm meaning, that they have 3mm wall thickness, which is enough to carry payload in the desired range. The weight per meter is 275gr, so I hope to be able to keep the frame below 2kg in the final stage (incl. motor mounts and additional CFK reinforcements).

Hier a pic of the rods:


and here a drawing of the copter (will be an X8), the length of the rods is 1m each.


and an optional variant:


best regards
Ferdinand
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Last edited by EndOfDays; Sep 10, 2013 at 08:02 AM.
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Old Sep 10, 2013, 07:58 AM
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Austria, Niederösterr., Eggenburg
Joined Jan 2010
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Finally the Propeller and motors arrived ...

U-Motors 100KV:






Propeller 28x9,2


If they fly as they look ...

best regards
Ferdinand
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Old Sep 10, 2013, 08:04 AM
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UK, Greater London, London
Joined Oct 2009
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Wow, this is going to be an impressive build!

Thanks for sharing EOD
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Old Sep 10, 2013, 08:05 AM
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thach's Avatar
South Korea
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OMG It's really big.
How much are the motors & propellers?
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Old Sep 10, 2013, 08:06 AM
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lol again an extreme build
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Old Sep 10, 2013, 08:11 AM
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Swanton, OH
Joined Jul 2007
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Ferdinand, I knew you wouldn't disappoint us. Thank you for being the pioneer in endurance flight!
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Old Sep 10, 2013, 09:46 AM
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United States, NY, Huntington Station
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Holy batman!!!
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Old Sep 10, 2013, 10:44 AM
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United States, TN, Clarksville
Joined Dec 2011
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I I have been wanting to do a build with those motors and props for months now but the price is out of my budget right now I'm really glad somebody is finally going to put these new motors to the test because ice been wanting to know how they perform. Good luck with your build I'll be waiting anxiously for the videos
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Old Sep 10, 2013, 10:57 AM
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Ferdinand as always you are awesome. Following with great interest.
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Old Sep 10, 2013, 12:42 PM
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Finland, Pirkanmaa, Valkeakoski
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An X8 with hose motors?
You don't do things half way, do you? I'm so subscribed to that because if I ever got the budget, I was thinking of building a Y6 with those drive train.
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Old Sep 10, 2013, 04:19 PM
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I think you would get a longer flight time just going to a hex or octo. I'm not sure if flight time is what your shooting for but an x8 seems less efficient. Either way it's pretty awesome lol.
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Old Sep 10, 2013, 04:42 PM
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Great build!!! Can't wait to see it working.
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Old Sep 10, 2013, 04:44 PM
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Austria, Niederösterr., Eggenburg
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You can do a quad that is more efficient, but if you want to build a lifter (for a reasonable payload) you have to try hard to beat the X8 with a hex, but you will never beat it with a flat octo, you will never be able to build a frame that lightweight (for a flat octo) that would allow to take advantage of the better prop efficiency. In this particular case you have to think of a frame that has a diameter of 2m(!) (that has to be done in a rigid way).

best regards
Ferdinand
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Old Sep 10, 2013, 06:24 PM
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United States, NC, Garner
Joined Mar 2011
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Over/under counter rotating prop systems are always around 15-30% less efficient than allowing a single prop to have its own undisturbed and non-accelerated air.

http://www.humanpoweredhelicopters.o...sa-tp-3675.pdf
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Old Sep 10, 2013, 08:07 PM
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Quote:
Originally Posted by EndOfDays View Post
You can do a quad that is more efficient, but if you want to build a lifter (for a reasonable payload) you have to try hard to beat the X8 with a hex, but you will never beat it with a flat octo, you will never be able to build a frame that lightweight (for a flat octo) that would allow to take advantage of the better prop efficiency. In this particular case you have to think of a frame that has a diameter of 2m(!) (that has to be done in a rigid way).

best regards
Ferdinand
yeah I see your point. are you going to use regular lipos for it or the Li-ion batteries?
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