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Old Dec 01, 2012, 08:20 PM
1400 watt RW Zephyr
matwelli's Avatar
Taranaki New Zealand
Joined Sep 2003
1,337 Posts
try both and tell me which works best.....I did have done both cg below and above the thrust line...... there's a reason I promote mass above the thrust line.

with your weight hanging below...imagine you want to move forward.....so you tilt your motors forward......what happens ?

motors pitch forward , causing the frame to tilt back , requiring tilting the motors even further forward.

watch the vid of any pendulum style bicopter and watch the little wobble that happens before they move
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Old Dec 01, 2012, 11:16 PM
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KAMAX-T's Avatar
Powell TN
Joined Jan 2008
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jeeesh...... lol
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Old Dec 01, 2012, 11:27 PM
1400 watt RW Zephyr
matwelli's Avatar
Taranaki New Zealand
Joined Sep 2003
1,337 Posts
Quote:
Originally Posted by KAMAX-T View Post
jeeesh...... lol
doh ! need to watch my tone -did not mean to come across like that.
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Old Dec 02, 2012, 12:50 AM
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Quote:
Originally Posted by matwelli View Post
doh ! need to watch my tone -did not mean to come across like that.
oh , your cool Matt , it's the previous posts.....

Heres' one of the Reverends (copter richie ) that's pretty awesome.... I know you can make the cc board do this , I just hope you post the settings' afterwards ...

Terry ....... post # 317

http://www.rcgroups.com/forums/showt...238357&page=22
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Old Dec 03, 2012, 08:48 PM
1400 watt RW Zephyr
matwelli's Avatar
Taranaki New Zealand
Joined Sep 2003
1,337 Posts
ritchie does some cool builds

well this thread has inspired me to build another bicopter
just making the motor mount/tilt mechs now, will only have 2kg of thrust available so need to keep the weight down, will post up some progress pic's
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Old Dec 04, 2012, 04:00 AM
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Roosendaal, Netherlands
Joined Dec 2004
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You speak about 2kg thrust like its nothing.
Mine will only have 1.5kg thrust and I expect to not go past 650 grams all up in weight.
Surely a 2:1 ratio is enough?

Are you building 4 footers?
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Old Dec 04, 2012, 04:02 AM
um.. yeah, I can make that fly
Carlos230023's Avatar
United Kingdom, Milton Keynes
Joined Jun 2007
3,756 Posts
:P. My one will have 8Kg of thrust. I ended up ordering bigger motors in the end. Thoes Turnigy aero drive ones seem to have a reputation for the magnets coming loose. So I went for an SK3 in the end.

CJ
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Old Dec 04, 2012, 04:05 AM
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Roosendaal, Netherlands
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Yeah well yours will be a monster, theres no competing/comparing with you.
Cant wait to see that freight lifter take off.
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Old Dec 04, 2012, 04:58 AM
um.. yeah, I can make that fly
Carlos230023's Avatar
United Kingdom, Milton Keynes
Joined Jun 2007
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Neither can I. Though there is alot of design to be done between now and then. I've got some 5mm stainless steel rod coming which will be the pivot point for my motors. They'll be floating on two or three bearings each. I think I may scrap the 3D printed gearing arrangement in favour of sturdy ball link pushrods. The fuselage design is also still in its infancy. Watch this space :P. Things will start to appear as the parts show up from china .

CJ
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Old Dec 04, 2012, 05:00 AM
um.. yeah, I can make that fly
Carlos230023's Avatar
United Kingdom, Milton Keynes
Joined Jun 2007
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Oh and for what it's worth. I think 1.4/1 static thrust to weight ratio is probibally as low as you want to go for a multirotor under 2Kg.

CJ
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Old Dec 04, 2012, 09:09 PM
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Powell TN
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Quote:
Originally Posted by matwelli View Post
ritchie does some cool builds

well this thread has inspired me to build another bicopter
just making the motor mount/tilt mechs now, will only have 2kg of thrust available so need to keep the weight down, will post up some progress pic's
Thats great Matt ... lookin' forward to your build ... Keep us posted ..

Terry
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Old Dec 05, 2012, 04:16 AM
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Too bad this is an unobtainable concept.



Not enough bodywork behind the pod to balance it out.
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Old Dec 05, 2012, 04:24 AM
um.. yeah, I can make that fly
Carlos230023's Avatar
United Kingdom, Milton Keynes
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I don't see a picture. There's just a little box.

CJ
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Old Dec 05, 2012, 04:54 AM
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Roosendaal, Netherlands
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I can see it? Try a link? Linkylink
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Old Dec 05, 2012, 05:11 AM
um.. yeah, I can make that fly
Carlos230023's Avatar
United Kingdom, Milton Keynes
Joined Jun 2007
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Well we've got the homepage of the website but still not much of a clue :P. Try a screenshot.

CJ
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