- #1
PEZenfuego
- 48
- 0
I wasn't sure where to post this, so hopefully I didn't post it in the wrong place and hopefully I won't get flamed.
Anyway, I am a boyscout and last weekend I was doing a demonstration on fire by friction. I use a bow drill. For those of you who do not know, this is how it works: A spindle (stick-like piece of wood) is spun by use of a bow on a surface that has a depression. That sounded confusing, here's a picture.
http://www.google.com/imgres?imgurl=http://www.raymears.com/blog/wp-content/uploads/2010/06/FMBC_bow_1.jpg&imgrefurl=http://www.raymears.com/blog/fire-by-friction-the-bow-drill-method/362/&usg=__XwvfWjBPuDJq3ejXBkHs5W0bEWQ=&h=276&w=400&sz=41&hl=en&start=0&sig2=-HBP3uAHLmhqMb_-bIrjgg&zoom=1&tbnid=ZAZzxtu8aKGl3M:&tbnh=144&tbnw=197&ei=pcrITIfIJs2XnAfY_aibDA&prev=/images%3Fq%3Dfire%2Bby%2Bfriction%2Bbow%26um%3D1%26hl%3Den%26safe%3Doff%26sa%3DN%26biw%3D1024%26bih%3D613%26tbs%3Disch:1&um=1&itbs=1&iact=rc&dur=428&oei=U8rITNC-I9LtngfDtuwT&esq=13&page=1&ndsp=12&ved=1t:429,r:1,s:0&tx=144&ty=49
My question is what kind of friction is this and how can I go about calculating it?
Anyway, I am a boyscout and last weekend I was doing a demonstration on fire by friction. I use a bow drill. For those of you who do not know, this is how it works: A spindle (stick-like piece of wood) is spun by use of a bow on a surface that has a depression. That sounded confusing, here's a picture.
http://www.google.com/imgres?imgurl=http://www.raymears.com/blog/wp-content/uploads/2010/06/FMBC_bow_1.jpg&imgrefurl=http://www.raymears.com/blog/fire-by-friction-the-bow-drill-method/362/&usg=__XwvfWjBPuDJq3ejXBkHs5W0bEWQ=&h=276&w=400&sz=41&hl=en&start=0&sig2=-HBP3uAHLmhqMb_-bIrjgg&zoom=1&tbnid=ZAZzxtu8aKGl3M:&tbnh=144&tbnw=197&ei=pcrITIfIJs2XnAfY_aibDA&prev=/images%3Fq%3Dfire%2Bby%2Bfriction%2Bbow%26um%3D1%26hl%3Den%26safe%3Doff%26sa%3DN%26biw%3D1024%26bih%3D613%26tbs%3Disch:1&um=1&itbs=1&iact=rc&dur=428&oei=U8rITNC-I9LtngfDtuwT&esq=13&page=1&ndsp=12&ved=1t:429,r:1,s:0&tx=144&ty=49
My question is what kind of friction is this and how can I go about calculating it?