Recent content by Niels

I have always wondered why mr Wilksch did not try his nice looking three cylinder inverted diesel as spark igniter. Our mr Battler Briton has an unused example and if I was rich I would try.

It will be fun to scheme and the essential parts have run well but not in same engine. Some clever ,well educated engineers from Esso lubrication laboratory near Southhampton UK was allowed money ,time and workshop to make an X Parson Epicyclic fourcylinder fourstroke. Time was around...

It is often termed a recuperated gas turbine.

If You gain 30 % efficiency the original single prop was work of genious. A wise rotating machinery guy Stanley Hooker once said that making more than 90% takes a genious as does lower than 70%

A certain mr Rutan once said that he would never again put something in front of propeller

Is said Predator engine a 0.67 litre.4000rpm,22 horsepower and 50 kg engine that can propel a Hummel Ultra with a 200lbs pilot?

It is not fair to compare AR- 5 with a twinseat glider as the AR-5 has a lot of extra drag from cooling of engine. Latest piston engine warplanes got a little extra thrust from cooling. A kind of ram jet . Ram jets are not realistic under mach 0.5 0r so.

Read the Gami patent. Roughly half of G100UL is modified benzene compounds that improves octane rating solidly. The benzene content of ordinary mogas is limited to one percent as it is a proven carciogenic. If I was public servant,I would not love to put signature on permission. It will be an...

That is my favourite aeroplane as well if pulled by an electric motor on nose ,supplied from two gensets around strut -wing junction. What is best in a crash? Two live vires up front or running engine, tankage and fuel pipes?

Thank You for link.Very informative. Sounds like what pre WWll german fuel chemists could dream up to save lead required for other use. Is it more carciogenic than pure iso-oktane?

Is there any public knowledge of what makes G100UL work? It is laudable to displace lead but if the cure relies on some exotic substance it migth be unobtainable soon? If patents are more than two years old they are public and I will love to read them. Not to compete but to admire.

An engine simulation expert has run a simulation with two exhaust valves of 32 mm diameter and got a BMEP of 8.5 making 34 horsepower at 60 rps in the proposed less than 20 kg engine. No turbo or tuned exhaust. Only thing is that postal drone engines are better serviced and cooled not inverted...

Chineese drone powerplant 6kW 7.2 kg 6 kW 7.2 kg Junkerators can better this ratio and be more frugal.

I had to think it over.The valved two strokes can maybe do a god job for aircrafts that has all motor mass up front. The thread here is for planes where total engine mass up front is not very good. My proposal is to put an electric motor/prop on nose and put an IC genset on each wing. In that...

There is a good example here Drone engine