![]() ![]() AIE model 225CS outputting 40 bhp / 30kW weighing 10kg = 3.0 kW/kg They make a lot of claims about 25 HP (18.6kW) and light weight, but don't actually mention the weight, which is down in their spec sheet - 21.2kg dry, which is about 0.877kW/kg.īy comparison, just a quick search of small Wankels turns up these: ![]() Liquid Piston still do not compare on their headline power-weight ratios. But worse, their power-weight just didn't compare to Wankel options available then. They were supposedly ready to ship Real Soon Now. When I worked on a hybrid-power multirotor drone about eight years ago, I was checking out Wankel engines for their power-weight ratio, and also came across this Liquid Piston crew. * okay so it looks like LiquidPiston is milling everything for the time being. Pretty much everything about it is simpler than a comparable piston engine, and when you've gotta scale up wartime production simpler is better. Then take a look at the LiquidPiston motor – at least on one variant they're using the crankshaft for fuel and air delivery. ![]() There's no mention if they comparable diesels are two or four stroke, but take a look at a four stroke injection pump and how complex they are (inline pumps are basically mini piston engines). The rotary engine is a few relatively simple castings*, a piston engine has a ton of small, complex parts. Now take a look at what's involved in building a diesel engine versus a rotary. Look at the strain that Ukraine has put on military supply chains. The issue with the parts isn't higher wear, it's simplicity. In that context the specific fuel consumption is likely less of an issue as there's some pretty hefty weight and size savings over the comparable piston engine (and they're claiming better fuel efficiency). WRT this engine, it's too small for anything but a small-mid sized drone. Right - they care about range, fuel efficiency is secondary at best. ![]()
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