New answers tagged

1

The term "critical engine" can actually refer to two very different factors: P Factor Engine driven accessories, depending on the airplane and how it's configured. A twin with counter-rotating propellers doesn't have a critical engine from a controlability perspective, but very often there are important engine driven accessories, like hydraulic pumps, ...


0

I don't know the specifics for that plane, but in general you do oil changes with the oil warm so that it is less viscous, so there's a minimum amount of dirty, old oil left inside the engine (and so you don't have to wait hours for it to drain). However it's generally a bad idea to do it while the engine is still at operating temperature, because then the ...


0

When the engine is running, it sucks up the oil from the reservoir and puts it in all the galleries, ie the oil's all in the right places to lubricate the engine. When you shut the engine down, the oil starts returning to the reservoir by gravity. So there's a gentle drip-feed back into the reservoir, which means that the apparent oil quantity measured at ...


0

Two engines are better than one for safety, but one engile is cheaper to develop and maintain. And these days modern engines do give you more bang for your buck so you don't need as many. Plus you get more missiles/bombs/etc. per kilo with a single modern powerful engine. US pilots initially hated the idea of the F16 because it was small and had one engine. ...


5

The result of being shot up changed a lot for fighter planes over the years. Modern fighter planes rarely get hit by bullets, but rather by missiles. A missile hit usually takes out the whole aircraft, so there are far less instances where having a second engine would help the aircraft to get back home. With this negating a lot of the reliability benefit of ...


10

The other answers address the question "Why 1 engine?" but this begs the question: "Why do some fighters have 2 engines?" as actually, 1 engine is the norm for fighter aircraft. Note the list of 2 engine aircraft in the OP: F-22 Raptor, the Dassault Rafale, the Eurofighter Typhoon, the Su-27 family, the F/A-18 Hornet With the exception of the F/A-18 ...


35

Fighters don't carry passengers. The figure of merit for combat aircraft isn't passenger-miles flown between accidents, it's objectives completed (like enemy targets destroyed) per billion dollars spent. Adding redundant engines only improves this figure if single engine failures are very common. Today, military engines have gotten much closer to civilian ...


48

Because single engine fighters are substantially cheaper to purchase and operate. Exact figures are hard to obtain, but as an example, an F-15 squadron will spend about 25,000 USD per flight hour whereas an F-16 Squadron spends about 15,000 USD per flight hour. Effectively, you can purchase and operate twice the fighter force with single engine fighters ...


0

Desert Air makes R/C aircraft engines. The 200 cc DA-200 puts out around 19 hp. I would go with 3 DA-100, two on the wing, one on the nose, giving it the Ford Trimotor look. But these engines run around $ 1000.00 US dollars each, and are NOT designed for human flight. It may be possible to time share a safer aircraft such as a Cessna 152 at a local ...


0

This is a homemade UltraLight airplane being tested with two pilot with different weight: 70kgs and 120kgs. It is using Simonini Mini Evo 2 (just use Google translate to translate the discription there). Simonini Mini 2 EVO: a 2-strokes single cylinder engine, 33HP (or 25kW) at 8000rpm. Dry weight: 19.3kgs. Made in Italy. This engine is quite cheap, most ...


1

Your best bet is to go with a motor developed for paramotors with all the grief of development already accounted for. They are big on static thrust and use small engines with simple and reliable reduction drives running fairly large propellers, mostly 2 stroke although there are some 4 strokes available now, like the EOS (if you want really decent ...


1

Scale up to the DA-150L, https://www.desertaircraft.com/products/da150l. It's more mature and widely available. With a 32x12" prop it gives 82 pounds of thrust at 5400 RPM. It puts out 16 hp. The "original ultralight" Easy Riser flew with just 11 hp. So it's possible. Here's some broader discussion of more than just the powerplant: Can an ultralight ...


1

You can use any engine in a homebuilt or ultralight, including one from a Model A Ford if you want. A 10 hp RC engine that runs at 8000 rpm? Even if you were building a single seat ultralight, in most cases you'd need at least 3 to 4 of them to have any kind of decent performance, if you could stand the racket they make. For something that can carry two ...


4

It's a 100cc engine, and it's in the Radio Control section of that web site. It's an engine for model aircraft. I suppose, technically, that's a home-built aircraft, but you're not going to sit in it!


0

On Boeing aircraft, the "centerbody" is part of the exhaust system. It is the inner is the inner part of the exhaust as shown in the picture below (the outer part being called the primary nozzle). The centerbody is also referred to informally as the "plug". Since your question seems to be asking about fan and compressor cases, this doesn't seem to fit. I'...


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