Antonov AN2

3D print the whole aircraft? [badass] :evil:

The flaps and ailerons look to be Fowler type, I suspect the slot gives more effect when the surface goes down and less when going up. A glider I once flew had them, they were known to give flutter problems, all surfaces were fitted with damping weights. However the speed at which this bird would fly, flutter is never going to be a problem!

Thanks Simon, I would like any digital files you have on this, I'm thinking of a traditional build, as and if I ever get the time!

All the AN 2 wing control surfaces are Fowler type. You can see the all the brackets to get the hinge line below the wing surface.
I will be using simple hinges as the slot effects do not scale.

Somewhere I'm sure you've said what the span will be but I can't find it! Please repeat for the benefit of the terminally stupid! (me)

All the AN 2 wing control surfaces are Fowler type. You can see the all the brackets to get the hinge line below the wing surface.
I will be using simple hinges as the slot effects do not scale.

I am sure it would be possible to print the whole thing but just printing the simple circular cowling and motor bulkhead will take over 5 hours!
Just a CAD image of the two part cowling at the moment.

Much printing today!
The scale (well close) ASh 62 mounted on the bulkhead.

The intention is that the motor cooling air will drawn in around the hub boss, around and through the motor and exit through the bulkhead.

Where it will 'sucked out' by scale cowling gills.
Whilst this bulkhead is the correct diameter it is only a 'test' version to check everything actually fits. The final version will be a bit different to accommodate the substantial exhaust ring !:ohmy:

On the finished plane access to both sets of motor mounting bolts will be only from one side so I wondered if it would be possible to print 'nut retainers' with the bulkhead.
First test piece.

The nuts (6 and 8 BA) are a tight press fit and in the final version of the bulkhead will be permanently secured with a drop of super glue.

Nearly finished the printing the motor mount & cowling.
The Mk2 bulkhead.

With front cowling in place.

And the ASh-62 in place.

Just organising the exhaust collector ring. It is pretty big so will just be visible inside the cowling but will not actually be connected to the exhaust stub on the outside!

Bizarrely the air frame will be scaled to match cowling rather than starting off to any specific wing span.:woohoo:
I suppose I had now better get on an actually build it

Superb design and 3D printing. Love the captured nuts idea I shall incorporate that into my designs. Thanks for sharing.

Just to be sure I did retain the nuts with a dab of super glue but with bolt out forgot how easily it 'runs' so when set it had completely filled the nut thread! It needed a taper tap and great care to clean the threads up again.
I would have done better to have put a smear of glue into the retainer depression before pressing the nut home.

The tile printed fuselage plan.

In my research I discovered that despite the AN 2's size and weight the wings are still only 'pin' jointed to the fuselage meaning all the flying loads are taken by the flying wires.
I had rather assumed with its quite thick wing section they would have been cantilever with the flying wires as a back up.

Maintenance by neanderthals with limited tools! You don't need any fancy testing gear, or special bolts that have to be changed at preset maximum hours.

And you can set the tension by ear - plonk is too slack, ping is too tight, boing is about right!

The ASh 62 is now complete with an exhaust ring and single outlet.

It is really only 'representative' but I have not yet found a way to do a tapered circular tube in FreeCad. The manual suggests its possible but it refers to menu buttons that I simply don't have! :woohoo:

The exhaust ring looks 'chunky' but it is a hollow single wall tube so only weighs 4 g.

Start cutting the 3 mm Depron for the fuselage tomorrow.

I think that looks brilliant