Tuesday, 27 March 2018

Antonov An-225 Mriya - lots more work

This beast is not only taking up a lot of room, but a lot of my time too.

Nose section, sanded "smooth".  Yes this is the smooth version, with wood glue seeping into the cracks before the P38 filler comes out today :

Loom soldering.  Lots of wiring going into this, and it stole the Emcotec connectors I was saving for the Typhoon.  This beast has 8 servos in the wing in total.

Starboard wing recovered, and new LE chrome trim added.

Many more updates to come, the push for April continues.

Thursday, 15 March 2018

Antonov An-225 Mriya - a PSS legend

In 1995 Simon Cocker made a rather large PSS glider - the Antonov An-225 Mriya ("Dream").  At 6m span, she made it into the Guinness Book of World Records.

Alas, in about 2006 the model suffered a crash on finals when the forward hatch blew open which resulted in a large un-commanded yaw manoeuvre.  The aircraft would not respond quick enough to corrective action, and she went in at just below cruise speed. 

The aircraft punched clean through a bush that slowed her a little, then parts starting hitting the ground.  The nose hit hard, and pulled the mounting hardware clean out of the main fuselage section, pivoting backwards and leaving a large gash in the port LE. 
Next, the main fus section hit more or less straight in - this was the big hit.  The main bulkhead ploughed  through the soil then fractured halfway up, blowing out a large section of the bottom of the fuselage.  This shock load flexed the wing tip panels so hard, the scarf joints cracked in the spars and the veneer creased on top.  The entire fus flexed, creased the veneer in 4 distinct lines, then righted itself. The tailplane also suffered here with a flexing stress crack of the veneer.
Most of the weight of the plane is the centre wing section - this carried on going forward, pulling the bolt plate clean out, fracturing a large 1/4" birch ply tongue, and shed all the engines.  5 out of the 6 engines were damaged, one badly.  The fins - nearly 2 foot high each - were completely unscathed from the crash.

When I picked the aircraft up she was in a sorry state, having sat dormant in a garage for the best part of 12 years since the impact.  Simon and some of the PSSA guys had managed to clear the crash site rather well, and just about every part was recovered though - making the rebuild a fair bit easier.

I have taken pics of most of the repair process, and probably wont blog them all, but here are a few.

The nose rejoins the aircraft on its latches for the first time in a long time

Port LE repair

Front of main fus repairs

Repairs continued

Centre wing flap reattachment

This has put a big dent in all the other aircraft builds and repairs, but they'll all get done, eventually.