Macchi M33 50 EP by Kyosho

  16 May 14 - Added photos from Alan Butterworth.

Macchi M33 by Kyosho - 3/4 view Macchi M33 by Kyosho - side view Macchi M33 by Kyosho - front view Macchi M33 by Kyosho - afloat Macchi M33 by Kyosho - low flypast Macchi M33 by Kyosho - touchdown Macchi M33 by Kyosho - flypast

Some photographs taken at Longham Reservoir courtesy of Alan Butterworth
  Close up of the motor nacelle Climbing out again Just starting to accelerate Interesting water stream from the wing float

N of launches / Time 4 0 hrs 22 mins
Wingspan 57.5 in. 1460 mm
Wing Area 580 in 37.4 dm
Flying Weight 6 lb 12 oz 3.06 kg
Wing Loading 26.8 oz/ft 81.8 g/dm
Wing Cube Loading 13.4 - Just above 'Scale'
Motors Overlander T4260/6 brushless outrunner - 500Kv - 42 x 60 - 3-7S LiPo - 1350W max
Propellers Ramoser VarioPROP 12C 3-blade, 12" type D blades, set at 9" pitch
Speed Controller Turnigy Plush 60 brushless - 60A (80A burst) - 2-6S LiPo - 3A BEC - Brake
Motor Batteries Turnigy Nano-Tech 5S 3850mAh 65C (130C burst) LiPo
Receiver Spektrum AR8000 - 8ch DSMX - 2.4GHz - Internal and remote receivers
Servos Ailerons 2 x Hitec HS-5085MG digital - 22g - 3.6 @ 4.8v
Elevator Hitec HS-645MG - 55g - 7.7 @ 4.8V
Rudder Futaba S3001 - 45g - 3.2 @ 4.8v
Static motor parameters On a Turnigy Nano-Tech 5S 3850mAh 65C (130C burst) LiPo pack the motor drew 42.2A at 19.04V  = 800W or 119 W/lb
Flight performance Well balanced, plenty of power allowing large loops, rolls nicely and has real presence

5 Jul 13 - Test flown today; looks a flies just right.  Plenty of power allowing large loops, rolls nicely and has real presence.

2 Jul 13 - A friend helped me complete a static motor run tonight.  I'd set the propeller to approx. 9" of pitch with the aim of getting 800W to hit the upper end of the range stated in the manual.  I was quite amazed that the test run gave exactly 800W, although for some reason the RPM didn't register and I'll have to redo the test at some point to gather that data.  As expected the Ramoser VarioPROP is perfectly balanced and silky smooth in use.  The propeller settings can be tweaked after the first flight to improve the flying performance (if required but unlikely).

One thing I didn't mention was that I put a pair of 4mm gold connectors in the positive power lead (can be best seen in the 3/4 view) where it goes up the front motor strut; a useful safety feature to allow arming once the hatch is fitted and possibly more importantly without needing to remove the hatch.  The connector can be unplugged with one hand through the motor pylon struts from the rear.  Everything is looking set for a test flight on Friday.

23 Jun 13 - The pilot I ordered arrived; I cut him down to length, painted him and epoxied him in place.  The 3-blade Ramoser VarioPROP looks really nice; I've set the pitch at approx. 9" for the initial static test.

16 Jun 13 - The build is progressing slowly . . . epoxy a couple of parts together & wait  . . . epoxy another couple of parts together & wait . . .   I've finished the wings (i.e. hinging the ailerons, aileron servos, incidence pegs and wing joiners).  The elevators are joined and hinged to the stabiliser and the water rudder is glued to the air rudder; just waiting for the epoxy to cure.

13 Jun 13 - I was looking round for interesting flying boats (seaplanes or floatplanes) and spotted this model, which even better was on offer; the Overlander T4260/6 motor was also on offer.  The Overlander T4260/6 would normally need a 14" propeller to give the intended power, which was not possible on this model; however a 12" diameter 3-blade propeller would be perfect.  To allow tuning of the propeller to the model I opted for a Ramoser VarioPROP hub and 'D' pattern blades.

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