My Audience has the Attention Span of an 11 Year Old
My son is part of Troop 404. I want to be a good Dad, and provide some input to their scouting skills with the ulterior motive of forcing a bit of STEM into the process. When we covered the use of Cotton Balls and Vaseline as tinder to start a fire. 11 year-olds are fascinated by fire.
|State Changes: Solid, Liquid, Gas|
We did start the discussion of the state change of Vaseline from solid, to liquid to gas as it was wicked by the cotton then burned. But you know... 11 years old.
Science: Change of State, Wicking, Oxidation,
Technology: Various tools to create fire/sparks
Engineering: A one-handed steel and flint (engineering simplicity)
Math: How to calculate the optimum amount of Vaseline (fuel) for a cotton ball (wicking framework) for maximum burn time.
From Flaming Cotton Balls to the Wisperlite Stove
- Mountain Safety Research (MSR) - Cascade Designs
- MSR Wisperlite Stove (at REI)
- How to start a Wisperlite (YouTube video 33 seconds)
The Wisperlite stove has not changed much in 30 years. I can say this definitively because I own the 30 year old version. These stoves consume various types of liquid fuel, but something else happens in the process.
In the video - did you notice that the correct way to start this stove is to set it on fire? A few drops of fuel in the lower cup, a source of fire, ignites a big yellow flame, then it burns down into an intense blue flame that sounds like a miniature jet engine. It's not like lighting your stove, or a BBQ grill.
You Can't Skip Steps to Get to the Jet Engine.
Something Else Happens
I sent an email to MSR to ask if they have a simple description of the process. Is it vaporization like the candle example above, or a venturi effect, or flash evaporation? Or, is it some combination of these processes?
|Proof that Math is Hard.|
|You have seen flash evaporation... |
but does this explain the Wisperlite?
I hope MSR will reply, so I can build out:
- Purpose and Materials
- Course Goals / Instruction Mode
- Student Goals
- Content / Arranged
- Supplemental Materials / Activities
Next up: Tent Technology, Thermarest, Scope Reticles.
The graphics above are linked to their original sources on the web.