Engines 01

OPENING QUESTION:  Suggest what might occur if we took a couple of 707 jet engines and attached them under the wings of a P51 Mustang.

LEARNING GOAL FOR TODAY:

WORDS O' THE DAY:

  • Thurst ("forward pushing force")
  • Air Friction ("resists forward motion")
  • Lift ("Lower pressure, upward pull")
  • Weight ("downward pull")

WORK O' THE DAY:

Let's have a volunteer come up and lead the conversation posed by the opening quesiton:

 

Now let's step back a bit and take a gander at what keeps aircraft in flying.

Keep in mind the the twin-devils of aircraft flight are weight and air resistance. Therefore aircraft designers are constantly tweaking their designs so that their aircraft are lighter and more streamlined.

Having said that, the aircraft still has to move forward.

Making engines as powerful as possible but as light as possible is key.... A super-duper strong engine that has a great deal of weight kind of defeats the purpose.

Similarly, a very lightweight engine that doesn't provide much thrust is also an issue...

Let's take a look:

Biplane:

Biplane (notice the similarity to a car engine)

In fact, the engine that powered most WWI bi-planes was a little more than half the horsepower of my FRS.

Rolls Royce Merlin Engine was the engine used in the British "Spitfire" in WWII:

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If you are a mechanic, you may notice many features similar to what you see under the hood in our cars. Only this engine was massively stronger...In fact, it had over 6 x the horse power of my FRS.

Take a few moments to research the Battle of Britain and pay particular attention to the roll that the "Spitfire" played in that conflict.

SUB: Please have someone come up and lead a conversation about the Spitfire/Battle of Britain.

 

 

It may surprise you to know that VERY same Rolls Royce Merlin Engine was used for 50 more years NOT in airplanes but something very near and dear to the folks at Seafair....

Please take a few moments and research the Rolls Roycee Merlin Engine and see what sort of craft featured those engines every year in August in Seattle! GO!

 

 

And the answer is.... HYDROS!

Let's take a quick gander at THIS

Those Merlin Engine powered hydroplanes were often called "Thunder Boats" because the Merlin Engines were SO LOUD!.

 

Now just for fun, once again (last time, I promise), go and check and see what modern hyroplanes use for an enginer... (hint, it's not an airplane engine!)

SUB: if time permits, have someone come up and lead a conversation on this.

 

We'll start from here tomorrow

TurboJet
Jet Engine

 

Now let's take a gander at our baby:

Let's say you're a jet engine designer and your tasked with designing the engines for the SR71 Blackbird.

Take a few moments and talk with your group-- list as many design challenges as you can

 

Now let's see how the famous engineers at Lockheeds "Skunk Works" plant solved those issues (HERE)