This looks like an interesting engine.

[skippydiesel]

12 hours ago, onetrack said:

The Apex seals in the Mazda Rotary are their weak point. Plus, their dreadful thirst - not what you want when you have limited fuel-carrying ability.

No experince - I understand that a Wankel 

• has a much greater power to weight advantage over a 4/piston engine. This may mean that a relatively small engine can be substituted for a larger = fuel consumption?
• once started, will get you "home", even with considerable integral problems. Safety enhancement.
• veeeery smoooth /low vibration. Reduced airframe & pilot fatigue.
• compact/low frontal area - cowling design could take advantage of this for improved airframe efficiency.

When you consider the 160+ years the IC piston engine has been in production/under development, compared with the 60+years of the Wankel, I don't think the rotary is doing so badly.😈

[facthunter]

They used to say IF IT will start, it will get you Home. They were Used in some racing Outboards.  As I also Mentioned there was an Airooled NORTON  Wankel Engined Pterodactyl at Gympie  that was pretty Neat. Nev

[facthunter]

There's no guarantee the Wankel will develop as the Piston engine has.. After trying all sorts of valving the Poppet valve has Proven superior, even for  GAS FLOW. Two strokes are virtually GONE. II wouldn't Put Money into wankel development. Round holes are easier to seal., IF seals have to have changing angles and flat faces It's asking too much. Even loose Piston Barrell face rings. Mazda gave it a good shake A pilot mate of mine had 5 engines in his RX3 but he Loved it. They don't have a Lot of torque at Low revs either but with a  supercharger the Output is sky High But I Guess the Life is less.. Fuel was cheap in those days.  Nev

[facthunter]

Mazda 's are not the worst Cars in the World, Their Arrangement with Ford worked well for Both. Remember the BONGO Van and the Astina. Nev

[Thruster88]

Here is a "new" engine that is actually flying. Only 3 moving parts, yes it is a piston ported forced induction jet A burning 2 stroke. Has been in development for about 20 years.

 

 

Small Aircraft Jet Fueled Engine - DeltaHawk Engines

WWW.DELTAHAWK.COM

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Powerful Technology Through Time-Proven Innovation. The first clean sheet piston engine design FAA certified in over 60 years.

 

[flying dog]

Excuse the digression here.

But as you lot kinda went there.

 

[Arron25]

5 hours ago, Thruster88 said:

Here is a "new" engine that is actually flying. Only 3 moving parts, yes it is a piston ported forced induction jet A burning 2 stroke. Has been in development for about 20 years.

 

 

Small Aircraft Jet Fueled Engine - DeltaHawk Engines

WWW.DELTAHAWK.COM

---

Powerful Technology Through Time-Proven Innovation. The first clean sheet piston engine design FAA certified in over 60 years.

 

prices starting at $110,000 for the complete DHK180 package 

No mention of the two cylinder suitable for smaller planes, other than the pdf spec sheet download

2 Cyl 120Hp is 16l/per hour but price is probably going to be in the R915 range😒

seems to have been in the 'coming soon' for ever

Edited December 27, 2025 by Arron25

[onetrack]

And that would be US$, too? 🙄