Bob Morley's Blog (10)

3D printed tricopter - latest version.

Thought I'd share some pics of my latest tricopter, it'll be the 10th version and the second 'flying prototype' (with any luck).

The design has come a long way, I suspect its still over target weight but I *really* want to get this thing flying.

Its all printed in…


Added by Bob Morley on November 17, 2017 at 12:30pm — No Comments

Tricopter update

Thought it about time I posted an update.

Attached are a couple of CAD sketches for the current Tricopter, the last one almost flew but was too fragile.

Changes are :-

  • Folding front booms.
  • Enclosed…

Added by Bob Morley on August 25, 2017 at 2:26pm — No Comments

Tricopter tail boom linkage

Here's a better photo showing the tail boom linkage - basically a pair of printed gears.

This design has fewer parts than a conventional linkage, less things to break so hopefully more reliable.

There's a 2:1 gearing ratio between the servo and the tail boom. The servo moves +/- 60…


Added by Bob Morley on June 26, 2017 at 10:41am — No Comments

Tricopter assembly

Dry assembly to make sure all parts fit, so far so good.

The distance between motors is 450mm so obviously the arms need to be cut down.

A PixFalcon goes on top, the GPS/Compass module will either go directly on top of the PixFalcon or have its own mount at the front of the drone.

Target weight…


Added by Bob Morley on June 25, 2017 at 12:25pm — 7 Comments


Printing almost complete 13 hours later.

Not sure about the 'lurid purple' colour, for some reason it was the only filament left at the shop.

This version doesn't have a camera gimbal, I want to see what the all up weight is without any 'extras' and have some fun flying…


Added by Bob Morley on June 24, 2017 at 8:44am — No Comments


Getting down to target weight has been challenging.

This version is lighter, stronger, and stiffer than its predecessors. Only airtime and hard landings will show if its good enough.

I'm printing in PLA with 60% infill, 0.2mm layers and slow print speeds which seems to give the strongest parts.

I'll post photos when its…


Added by Bob Morley on June 21, 2017 at 11:14am — No Comments


The design is almost complete so thought I would share it.

The remaining part is the connection between booms and the chassis, which needs to be strong and provide vibration resistance. 

All I've come up with so far is a 'rubber grommet sandwich' with M4 bolts/washers etc,…


Added by Bob Morley on April 28, 2017 at 8:27am — No Comments

Frame design.

I've been experimenting with frame design, an essential component to keep all the parts flying in formation.

I printed some interlocking plastic parts in 2mm PLA & super glued them together to see how rigid/strong the end result.

The attached pic shows about half the…


Added by Bob Morley on April 26, 2017 at 2:30pm — No Comments

More progress...

Most of the parts have arrived so I've been able to get accurate measurements and start on the airframe, a small tricopter. Materials are carbon tubes & 3D printed PLA.

The laws here in Chile are restrictive. You need a license, drone registration, insurance and the drone has to pass inspection - apparently *very* hard to get.

If the drone weighs less than 700 grams its classed as a toy, which means no restrictions other than common sense and being…


Added by Bob Morley on April 19, 2017 at 4:00pm — 7 Comments

PixFalcon, Mega2560, Pi2 & S-Bus

Hi all,

Thought it about time I posted something about my new project, which is all about getting way too many sensors airborne on something interesting. I've flown fixed wing models before (many years ago), multirotors look like more fun.

So far I have a PixFalcon, a Pi2…


Added by Bob Morley on March 26, 2017 at 5:00pm — 2 Comments

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