Just finished assembling the frame. looks like a tank! lol.

I really have a hard time bending the arms! I decided to build a wooden brake for these arms (gave my hands a hardtime).. Bolted up with M4 x 10mm screws.

Need to put some rubber grommets on the 12mm holes. I also need some paper sanding on the arms to have those aluminum residue from machining removed-- to also have a matte finish look..

You can see the stack-up plate installed inside the centerpiece. I am planning to put the flight controller here. The metal screws will be replaced by nylon screws..

I need some ideas on mounting the landing gear to the quadcopter frame.. one of my option is connecting these using a rubber with double sided. or installing 8 anti-vibration balls like this one.. from goodluckbuy.

The whole assembly weights at 500g.. i will update the weight again after finishing all accessories. By the way, the total length motor-motor is 560mm.. Is this heavy for this size?

I am still waiting for some parts.. next will be landing gear and frame connection.

Views: 2049


MR60
Comment by Hugues on September 28, 2013 at 5:20am
This a real nice and true DIY project. Keep creating and report back once fully assembled and flown !
Comment by rjc_quadcopter on September 28, 2013 at 5:32am

Thanks Hugues. I will surely keep you guys posted.


Admin
Comment by Morli on September 28, 2013 at 9:52am

Looks bullet proof :)).Good work. keep us updated.  what ever you do , make sure antennas hang out and are safe from damage.

Comment by Gary McCray on September 28, 2013 at 10:02am

Hi RJC,

Really nice clean design and execution.

The fact that you are using bendable (not T6) aluminum does mean that in the event of a hard crash, things might get bent, but you can probably straighten back out a few times anyway.

The Flamewheel F450 Quad frame weighs 282g and the F550 hex weighs 478g and of course, CF frames tend to be lighter.

But yours looks like a very sturdy frame and the extra arm length for a quad means you could accommodate larger propellers and motors which mean you could end up with a substantial lifting capacity and reasonable efficiency.

What is the motor center to edge of where your arm member joins the frame center and motor to motor centers on a side. 

That will determine the largest propeller you can accommodate and I am guessing around 14 inches or so tipt to tip on the side.

You might want to use a motor that could accommodate the largest propellers that would fit.

You could start with somewhat smaller propellers, because they would handle better (12" x 4.5) maybe).

Motors 3S or 4S 600 to 920 KV at least 120 watt and 30 amp ESCs.

(DJI Flamewheel motors are the absolute minimum I would consider and I really think they are too small even though you could get it to fly with them.)

Other stuff will probably work, these are just my thoughts that might help you get it in the ball park.

Comment by rjc_quadcopter on September 28, 2013 at 3:25pm

@ Morli.. lol... thanks for the reminder..

Comment by rjc_quadcopter on September 28, 2013 at 3:36pm

@ Gary, Yes the reason that I did not use T6 aluminum is because of its tempered state-- very hard to bend, unless you anneal it. All the process will become complicated for a DIY. I used 3003 aluminum.

Wow you guessed it right! 14 inch prop is the largest that the arm can accommodate. Thanks for the tips. I am looking at sunnysky 2814 700KV on a 4S battery. T-motors 3508 are also in my option.

Comment by Jay Galleno on September 28, 2013 at 8:43pm

that's really a tank just landed in your garage! congratulations Reggie!

Comment by CliffN on September 29, 2013 at 1:08am
heavy tank in comparison to other aluminum class frame
Comment by rjc_quadcopter on September 29, 2013 at 1:44am

@ CliffiN. Yup a heavy quad. from the start I already knew this quad will way around 450 to 500g. way too heavy compared to 3dr quad (below 450g).

Comment by Gary McCray on September 29, 2013 at 5:56pm

Hi RJC,

4S and those motors sound about right, T motors are seriously expensive but really well made though.

I presume you are talking about the 3508 T motor in the KV700 class too, looks good and shows 60 OZ max thrust with an APC 12 x 3.8 prop, that ought to get you off the ground in a hurry good efficiency at 1/2 throttle too.

I'd plan on trying a variety of props between 12" and 14" some are bound to work much better than others.

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