Replies to This Discussion

DeveloperPermalink Reply by Adam Rivera on March 11, 2012 at 7:17pm

Larger flying machines are inherently more stable (if designed properly), but a lot of smoothness and stability comes from tuning your PID gains properly. I think you can get a hex to act much like an octo. A lot of times it comes down to a level of redundancy you want and maybe an increase in payload as well. I fly a large (over 5 ft tip-to-tip) octocopter and it can behave very very smoothly, but that is with proper tuning. If I tune it poorly it is twitchy like any other platform. Also you mentioned the wind... my octo can withstand some heavier winds because of its size. Good luck in your endeavors!

• ▶ Reply

Permalink Reply by Eddie Weeks on March 12, 2012 at 6:45am

I don't think its the number of motors that make it smooth, its size and tunning..

I am flying a tri-copter 1.7m across.... that is far more stable than most videos I have seen here... 

Here is a video from that Tri

http://www.youtube.com/watch?v=qtzQ9HbAFWM

Eddie Weeks

 

• ▶ Reply

Permalink Reply by HangerRat on March 12, 2012 at 7:38am

Thanks for the feedback. It makes sense that bigger is better able to handle winds. Both of you (Adam/Eddie) clearly have big birds with smooth flight. Hmm, it seems to be all a set of tradeoff choices (size/weight/operating ranges/flight time). Some things never change  :) .

• ▶ Reply

Permalink Reply by Eddie Weeks on March 12, 2012 at 7:49am

oh... one thing I found... the motors need to be in their sweet spot...

If the props are too big and turning too slowly, this is not very smooth..

If the props are too small and turnning too fast, may be able to lift anything...

so... get lots of props..haha

Eddie

• ▶ Reply

Permalink Reply by HangerRat on March 12, 2012 at 7:55am

I have been running combinations in Ecalc like it's my full time job!  Do you find that tool to be accurate?

>>Lots of props  I got ya, it is the most replaced part on my Quad so far.... :( 

• ▶ Reply

Permalink Reply by Haidar Abu Bakar on March 12, 2012 at 8:23am

Hi Eddie,

I have a lotusrc T580P+ quad. It comes with 400KV motors and 14in props. I changed the FC to DJI Wookong M. It is sluggish but stable. My only probelm now is it wobbles on GPS positon hold. I tried using smaller 12 in props hoping to get faster movement but it drains my lipo faster. As for load carrying, the 14in props seem to do better carrying my 250g camera than the 12in props.  Any advice?

• ▶ Reply

Permalink Reply by Eddie Weeks on March 12, 2012 at 11:15am

dude...  I don't know that machine... If its a fast wobble then I would say rate_P is too high...

If its a slow wobble the change some GPS parm... that all I got.. haha

• ▶ Reply

DeveloperPermalink Reply by Adam Rivera on March 12, 2012 at 7:55am

No problem. You can see my octo here.

• ▶ Reply

DeveloperPermalink Reply by Adam Rivera on March 12, 2012 at 7:56am

Also, I have another video that hasn't really been sliced up properly yet, but I can PM you the link if you are curious enough.

Adam

• ▶ Reply