The HP VT21 4-stroke RC model plane engine

This is a 30 year-old 4-stroke engine which has an Aspin Rotary Valve in the head rather than more conventional poppet valves and camshaft. These engines are very weak but also amazingly quiet. The airframe is a very old design from the 1960s I think and it weighs a ton. Flying this engine/airframe combination requires a *very* light touch on the sticks because it'll stall in an instant if you attempt to slow it up or use just a fraction too much elevator. Still, it makes a nice change from grossly overpowered trainers, 3D machines and pulsejet-powered RC models.

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A large turboprop-powered Das Ugly Stik RC model airplane
This unique turpoprop powered Ugly Stik was seen at the 2011 ANZAC jet rally in Tokoroa New Zealand. This was only its second flight. Something nicely different to all the other turbine-powered jet models in the sky at that event.





200mph RC plane spins prop at over 30,000 RPMs
The very fast pylon racer RC plane I featured a few months back returned to the field last weekend and I captured some more video of it. Top speed is around 320kph but on this run I think the engine was a little rich. Still pretty impressive (and really loud) though. Oh, and the glorious smell of castor oil -- you just don't get that with electric models. The smell of burnt wiring, melting ESCs and venting lipos is really not the same! 30,000+ RPMs -- so sweet!





Kalt .45 4 Stroke Engine is Antique. Let's run it.
One of the first 4 Strokes to hit the market in the early '80s was this Kalt .45. It was manufactured by Kalt Sangyo of Tokyo, Japan and was one of my most reliable and greatest flying engines for my planes. It needed no muffler and used no or low nitro content fuel to run. I decided to run it for all of you to see and here. Thanks for watching.





Things that should not fly #3
Another example of things that ought not fly but (believe it or not) really do. Robert's "lolly-bomber" RC plane is made from coreflute, polystyrene foam, brown packing tape and EPP. This was its maiden flight and a part from the utter failure of the EPP nosewheel, it worked out pretty damned well, especially considering the strength of the wind on the day. If you look carefully, you'll notice that Robert's DX7 radio has two antennas. He's fitted a FrSky 2.4GHz DIY kit and now runs exclusively with FrSky receivers. Robert is one of the founders of the NZ Parkflyers movement at http://www.parkflyers.org.nz




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