16 replies to this topic

[A*Morale]

Hi guys.
I have problem with my bigger quad (one esc does weird things raising throttle) so i cannot fly for now.
So It was time (while waiting for my holidays) to finish a mini vtail quad I had in mind for a lot of time.
I is basically built around some 4mm carbon fiber tubing and some kite rubber joints.
I used a 4mm kit and a 6mm kit. The 6mm provied the joint used to hold the four motors while the 4mm was used for the remaining joints used to build the structure.

Here is the base frame composed of carbon tubing and a little glass fiber rectangle.


The rectangle was epox'ed to the tubes after it was tied using some wire. In the rectangle there are four rows of holes used to let the wire passing through it.
Here is better shown how it is tied.


After the base frame was ready I started to put the electronic on it. Here there are two escs, a simple ditribution board and the CopterControl that will power the Vquad.


In this pictures it is almost complete. all the wirings were done and all is ready for testing motors.


Here is another pictures with propellers. all is wired (There is also the Bluetooth module i used to configure the CopterControl and test motors without the need for the usb cable)


Now the last missing piece is the adapter (a simple 3.3V power regulator) needed to attach a Spektrum satellite receiver to the CopterControl. I hope to finish it tomorrow to be able to do some flying tests with the newborn VQuad

Motors: 4 hxt 2730 rewound as 10turns wye for the two in front (with gws 8x4 propellers) and 10turns delta for the two rear motors (with 5.5x4.5 APC propellers)

ESC: 4 12A hobbyking blueseries

Tubing is 4mm carbon fiber tube (used for kites)

Joints are from 4mm and 6mm kite joint kits

Battery is 2s 1000mah 25c Turnigy nanotech

Orange Sat Receiver for Spektrum

The weight is a little less than 300gr with battery.
more pictures here

[Mat Wellington]

good stuff, love the build ! that will be fun to blast around inside

can you angle the rear motors in instead of out ?

[A*Morale]

good stuff, love the build ! that will be fun to blast around inside

can you angle the rear motors in instead of out ?

I can angle them downside, so it's the same plus no obstacles to the fast air flux

[A*Morale]

Ok, no spektrum satellite yet, a lot of vibes to gets rid of and the need to found some idea for the landing skid.
Here is a little flight(or better to say a skid barely lifted from the floor )



The yaw behavior is awesome

[AlPackin]

very cool, just watch out for the furniture

[A*Morale]

very cool, just watch out for the furniture

No concrete floor(it is a parquet), no more quad testings:)

[A*Morale]

I was very busy in the last couple of months so I were unable to get rid of the heavy vibrations that render quite impossible to fly with this copter.
So yesterday, in a little creative raptus, i rebuitl it from scratch using some parts that I had at hand.
It is built using a spare 100mm X 100mm quad frame, some 7,5mm aluminium square tube, bolt and nuts.
The fixtures for the rear motor was done with a little piece of HDPE cutted at 45°
Attached is a picture of the result

It weight something around 330gr with a 2S 1300 nanotech lipo.
beihg a lot stiff than the other frame the vibrations are no more a concern.
In the first fly I did it seems to fly very stable but it has not yet very much authority, but is only a matter of PID tuning.
Hopefully this will came in the next couple of (sunny) days

Attached Files

•  IMG_0331.JPG   1.52MB   66 downloads

[m_thread]

Ooh, that one was just too cute Mine is a monster compared to that tiny thingy.

/F

[A*Morale]

Ooh, that one was just too cute Mine is a monster compared to that tiny thingy.

/F

Unfortunately the motors i had at hands were too heavy for this frame. I think that with some 5gm motor it should be awesome.
In the new frame I have to optimize the weight distribution so that the majority of thrust is requested on the front motors (that are more efficient given the larger props).

[A*Morale]

Here is a little video of the first flight test for this thingy....

Still a little bit of work to do: adjusting the mixer to compensate the roll effect of the tail motors and PID settings.
Also i had to better set the accelerometer level (i had to trim a lot to made it staying still and that's the reason because only hover in this video...).

[m_thread]

Ooh my, that's a gorgeous little thing you got there. Seems to fly well too.

I have a plan do rebuild my 'monster' as soon i get my cnc mill running.

/F

[Mat Wellington]

It interesting that you get a roll effect from the yaw - where is your centre of lift?. I wonder if its a size thing or a cg thing, as I don't notice any couplin

[A*Morale]

I've to investigate further, as i tried to put the two rear props as close as possible to the center.
By the way I'm very close to finishing my CNC machine (i just need to set two home sensors and than setup the mechanics), so i hope there will be a new and lighter version very soon

In the next version I want to use very small rear motor (something like the 10g or 5g HK motors) with two very small prop and put the CG Just a little behind the two front rotors. I want the tail to be used mostly to manage pitch and yaw.

Edited by A*Morale, 12 December 2011 - 02:58 PM.

[Brian]

In the next version I want to use very small rear motor (something like the 10g or 5g HK motors) with two very small prop and put the CG Just a little behind the two front rotors. I want the tail to be used mostly to manage pitch and yaw.

I think in order to do that you're going to have to hang the battery pretty far forward. I tried using smaller motors on the back on my mini V-tail 6, and I couldn't get the mix right to make it work. I had the GC a ~25% back. The biggest problem was that the front motors would push the thing back before the rear motors would lift the tail. That could likely be fixed by adding something to support the tail on the ground, but it still didn't fly well even when I got it off the ground. Maybe you'll have better luck than I did, though, especially if you push the CG farther forward.

[Mat Wellington]

I think in order to do that you're going to have to hang the battery pretty far forward. I tried using smaller motors on the back on my mini V-tail 6, and I couldn't get the mix right to make it work. I had the GC a ~25% back. The biggest problem was that the front motors would push the thing back before the rear motors would lift the tail. That could likely be fixed by adding something to support the tail on the ground, but it still didn't fly well even when I got it off the ground. Maybe you'll have better luck than I did, though, especially if you push the CG farther forward.

I wonder if you could use the second throttle curve to spool the rears up early, I see thst issue if I drop throttle then put the power back on, the fronts lift first

[Brian]

I wonder if you could use the second throttle curve to spool the rears up early, I see thst issue if I drop throttle then put the power back on, the fronts lift first

I did that, and it helped quite a bit.

[3rdeyepro]

Love this build. Keep the videos coming!