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Old Sep 04, 2012, 07:01 AM
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South Africa, GP, Krugersdorp
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DIY TriCopter the CAD way

Hi All,
This will be my first attemt at building a TriCopter.
I have been collecting componants for a while now and reading alot on
these forums about there design and make-up.
So here is the beginning of my design.

It will be using the following hardware:
3 x Arrowind 2205/22
3 x AEO 8 x 4
4 x Assan GA250 Gyro's
1 x 9g Digital Servo
3 x 18A ECS
1 x 3S1800mAh 35C

The arms will be of 10mm Carbon Tube.
The body at the moment is 4mm PFTE (subject to change)

The design is not finnished yet ,so there is always place for inprovements.

I'll be using my T8J for mixing and 8ch reciever.

Please let me know your thoughts on this.
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Old Sep 04, 2012, 12:32 PM
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Here's my two cents:
- Why the gyros? This solution is outdated and it'll be very hard to control. Even the simplest KK board would be much better, not to mention that for the price of those gyros you can buy a good MWC board. Crius board with gyro, acc, mag and baro is ~40$, but for the first multi you'd be better off with the KK or KK2 board which are cheaper.

-I don't see any yaw setup.

-4mm PFTE would be heavy as hell, 1.5mm is enough, 2mm is super-strong for a multi.

-1650 rpm/V motors are too fast, lower rpm/v (750-1100) are more efficient in multirotors.
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Old Sep 04, 2012, 05:09 PM
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Yeah ditch the gyro's. With the space you have inside you could easily fit a KK board as well as the ESC's and then you have nothing on the top to break.

While you are still in the design phase be sure to add some system to fold the arms back. makes for much easier transportation.
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Old Sep 05, 2012, 02:46 AM
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Hi all, thanks for the replies.

n3mo-The yaw system consists of the rear shaft runnung on two needle bearings.The servo will be Blue Bird 380MG fitted directly to the shaft.

Unfortunetly I have not been able to track down a supplier for any KK type boards
in my area and have these gyros lying around.
Same with the motors.

This will be a learning curve I'm sure cause I have never used a computer radio before.

My intension is to move to a KK board even if I have to build one, but that will take some time.

I am still looking for another suitible material in the place of the PFTE. Maybe ply?What do you think.

Helno-I have desided to ommit folding arms for ease of build cause the copter is not very big.PCD of motors is 400mm.

Weight for the model sofar is 489g and as is will end up at about 600g.

But I'm still looking a ways to drop the weight.

I think it will evolve as I go on.
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Old Sep 05, 2012, 12:40 PM
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Hobbyking has a range of KK boards, shipping shouldn't be expensive. Learning curve with bare gyros will be steep as hell, you'd need a lot of experience with single rotor helis in general to be able to even get it in the air.

Many people use ply to build frames, it's cheap, easy to work with and dampens vibrations nicely. My favourite material is 1-1.5mm fiberglass, same stuff used to make PCBs. It's light, and 2mm fiberglass frame is basically indestructible.
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Old Sep 06, 2012, 02:49 AM
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Hey n3mo,

The only fibre board I could find was one sided PC board ,if I can get the coper off it is a definit option.I also have 3mm ply that I am leaning to ,maybe stick some cf fynel on it for finnish.

As far as the board goes I'm still searching localy.Might be able to get hold of something by the time the frame is build same for motors.Come payday I might go look for 3 low Kv motors.

For now I want to concentrate on the frame design-strong,simple,easy to build,light and not looking like a pair of sticks.

Cheers.
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Old Sep 06, 2012, 05:01 AM
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South Africa, GP, Krugersdorp
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Justfound out there is a HobbyKing Shop front at a shop in Pretoria North.
On the website they advertise the HobbyKing Multirotor V3.0 board and the i86 board.
The V3 is priced at R250 and R70 for a AVR Usb programming device.They also sell the Turnigy 9X 9ch Radio for R1200 which is cheap for 9channels around here.
So come payday I going on a trip to Pretoria.
Now I can concentrate on the frame.
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Old Sep 07, 2012, 08:23 AM
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@ Sonicx try wifly.co.za, shipping from Durbs is cheap.
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Old Sep 10, 2012, 04:32 AM
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Bobbo, thanks for the link.
I see they have some nice stuff.
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Old Sep 13, 2012, 02:11 AM
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I have now made the frame bigger and increased the PCD of engines to 400mm.
Also changed to 3mm plywood.I'm leaving the Gyros for now till I can get my hands on KK board.
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Old Oct 15, 2012, 03:15 AM
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Here is some updates on the design.
This is the undercarraige I'm going to use.this will take the load of the booms.
i need to model the KK board and place it before finilizing the frame ,the servo
connection to the boom aswell.
These are 3mm CF rods with hard plastic balls at the ends.
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Old Nov 27, 2012, 02:15 AM
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Now the show can go on

Well ,haven't been here for a while.
I have been waiting for my Hobby Shop to get there shipment of KK2.0 boards from HobbyKing. It has taken almost 2 moths for the stuff to get here.He ordered 10 boards and only one arived which I took.Now the project can go on and hopefully while I'm on leave in Dec. I can finnish this one and some of my other projects.
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