Replies to This Discussion

Permalink Reply by Peter on February 23, 2012 at 10:00pm

You do have the booms supported in two places dont you?

Pics of the setup would be helpfull.

 

Regards Pete

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Permalink Reply by Andrew Adams on February 24, 2012 at 5:48am

Hi Pete,

Here are a few pictures that I have, plus a stock picture of the boom mounts. I will have to get a close up of the boom mounts once I get home.

The mounts are VERY secure and support the boom very well. The problem I'm having is that when I add the motor to then end of the boom (as shown) the G10 deflects slightly. I don't want this to be a problem down the road and cause vibrations that then transfer through to the rest of the copter. 

Here are the boom mounts. They bolt to the frame and sandwich the boom in between.

Here is a close up of the motor mount:

And lastly an overall picture of the copter:

Thanks for the help!

Andy

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Permalink Reply by Peter on February 27, 2012 at 3:26am

Hi Andy once you mount 2 motors with props how much room is there between the two props also maybe the frame is a bit overloaded with two batteries is it suppose to handle or would you be better of with a single high capacity battery to save some weight.  My next hexa only has a gap of about 1" between the props so you could trim the arms to give you lets say 2" clearance or maybe 3" and see how much flex you get.

Have a look at some hexas and you will get some idea my hexa will be Xaircraft Diy Hexa.

 

Regards Pete

 

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Permalink Reply by Andrew Adams on February 27, 2012 at 5:15am

When I was doing my testing, I left off the top plate(s) and just bolted down the boom mounts. I think this was my main problem...I don't think one plate of the G10 is stiff enough to prevent flexing. Once I add the top plate and sandwich everything together (as shown in the last picture) I believe it will be ok.

Right now I have 3+ inches between props. I am going to test fly it as is and then start cutting down the booms and/or tuning.

Where is a good place to start for pid values on a large hexa?

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Permalink Reply by Peter on February 27, 2012 at 2:40pm

For pid's do a post in the forum below as there are a few guys that are flying Hexas, and some other guys there that proboubly could do the PID's in their head (Freaks)lol.  There is a huge amount of knowlege in these forums.  As soon as I get my hexa we can compare notes. Also I have been using these for vibration dampering for motors and APM with good results.

http://www.ebay.com.au/itm/100-Tattoo-Needle-FULL-GROMMETS-assorted...

Here is the forum.

http://diydrones.ning.com/forum/topics/arducopter-2-4-released

 

Regards Pete

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Permalink Reply by Andrew Adams on February 27, 2012 at 5:56pm

Thanks for the link to those grommets! I'm going to have to check those out. How do you have your APM mounted? Any pictures? I've been collecting vibration dampening gear for a while and plan on testing everything once I get my copter flying and tuned. I am hoping to have it up in the air this weekend.

As for the PID's, I'll make a post and go from there. Thanks for the help and can't wait to see your copter fly!

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Permalink Reply by Marc on February 27, 2012 at 2:47pm

Hello guys,

just a quick note i am running 12" props with a gap of 12" between each prop on my hex very stable

heres a quick video: http://www.youtube.com/watch?v=spZK03Jb2x4

 

regards

 

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Permalink Reply by Andrew Adams on February 27, 2012 at 5:54pm

Thats a nice copter. What motors are you using?

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Permalink Reply by Marc on February 28, 2012 at 3:20am

Hello Andrew,

 

Am running turnigy park 480 motors  (850kv) i went for the larger props as they are APC as i tried the standard plastic props and they are too flexible the apc's are stiff.

 

regards

 

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Permalink Reply by Mike M on February 28, 2012 at 9:10pm

Very pretty motor mounts - how much do they weigh? Is that 3/4" carbon tubing? I was planning on using 3/4" square carbon and creating a carbon fiber plate mount.

-Mike

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Permalink Reply by Andrew Adams on February 29, 2012 at 5:31am

They are 8 grams. The only downside I have with them is the price. They are WAYYY overpriced. Saying that doesn't make me feel better about buying them, but after I searched long and hard, these seemed to be the best choice. They were well thought out and machined well. Very sturdy. I'd suck it up and pay the premium again.

As for the CF arms, they are 12mm (so just under 1/2"). They are standard 450 size heli booms which makes them available in every hobby shop if I ever break one and need a quick replacement.

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