I received the OS rotary 49-PI Type II, the newest wankel engine.
I installed the engine to wood plank and mounted fuel tank + propeller 10x6. Filled up fuel tank with fuel who has 10% nitro and 18% (50% castor oil and 50% syntetic oil). Glosed and reopened 2 turns in main needle after the instruction manual. Then i primed the engine and connected battery to glowplug. Tried to hand start the engine without luck, it was very difficult to hand start. The engine are ignite and will oscillate some time, mostly nothing to start the engine.

Why difficult to hand start the wankel engine? [sm=50_50.gif]
Let us see at the wankel engine, the rotor are rotating 1 revolution while the shaft are rotating 3 revolution, also it is not enough to rotate the rotor fast as the reciprocating engine can do it when we are flipping the propeller fast. With the slow rotating rotor are difficult to get compression quickly before ignition. Also the engine are "overgeared" engine who make the engine difficult to hand start(let us say "the engine are 3 cylinder two stroke radial engine with gearwheel at 45 teeth are driving the propeller with 15 teeth" then the engine will go slow while the propeller are hand started, you understand?).

I has not electric hand starter, then i saw at the propeller drive washer has a groove. I got a idea and took the rope and turned around the propeller drive washer, connected to glowplug and started the engine. Hurrah, the engine was easy to start, ran well. I adjusted the main needle rich (3.5 turn from closed). I am surprised the engine are really hotter than reciprocating engine!!! Exhaust gas are insaneous hot.. Since the engine are new, the rotor are not sure adapted to wall in the engine and can have friction to generate hot. I saw the silicone tupe between rotorhouse and carburator was without oil.. adjusted more rich (6 turns from glosed), very much smoke and oily from exhaust muffler, still not oil from rotorhouse and the engine are hot as before. I will wait until the engine are ready and all parts are adapted after running-in, maybe oil will come there. To be sure the engine get enough oil so long the engine are new.

After i ran the engine, then i was afraid in case the leaf spring for apex seal was destroyed by hot. No, compression are still good as before. There are possible to check the leaf spring are ok: remove exhaust muffler, rotate the shaft until you can see the apex seal are visible. Take the thin wood stick and move light at apex seal and feel if spring are ok or defect. It is better do not dismantle the engine before you are checking the leaf spring are defect or the apex seal are stucked by old oil with the thin wood stick.

Before the engine are stored over winter to example, be sure the are soaked in alcohol in some hour and all dirt are removed from engine, check all the apex seals and leaf spring are ok (as i wrote above), give the engine after-run oil and pack in plast bag.

As i learned how the engine are:
Easy to start
Not sensitive to adjust carburator
Smooth and vibrationfree running
Quiter running

I not learned: Will the wankelengine last long as the reciprocating engine, let us see in some year...

Lack of parts in wankel engine: Recoil starter!!

Next time i will upload the movie in youtube.