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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!magnus.acs.ohio-state.edu!usenet.ins.cwru.edu!agate!boulder!ucsu!spot.Colorado.EDU!frechett
- From: frechett@spot.Colorado.EDU (-=Runaway Daemon=-)
- Subject: Re: Throwing tuning
- Message-ID: <1993Jan25.005118.2068@ucsu.Colorado.EDU>
- Sender: news@ucsu.Colorado.EDU (USENET News System)
- Nntp-Posting-Host: spot.colorado.edu
- Organization: University of Colorado, Boulder
- References: <1jn09oINN9vn@usenet.INS.CWRU.Edu> <C19uJw.7nw@boi.hp.com>
- Date: Mon, 25 Jan 1993 00:51:18 GMT
- Lines: 81
-
- In article <C19uJw.7nw@boi.hp.com> bblohm@boi.hp.com (Bill Blohm) writes:
-
- >However, I think I was perhaps not quite clear about spin definition. I was
- >thinking more along the lines of the actual amount of spin and it's effect. I.e.
- >10 rpm vs 30 rpm (or whatever the rate is). I would think that the more rpm I
- >give the 'rang as it leaves my hand, the higher it would climb.
-
- Few boomeranges have much of what you might consider a helicopter effect.
- That is, you spin them more and they climb. More often they have an autogiro
- effect, which means that they will hover more the faster they spin. What
- this means practically is that the more spin you can impart the longer the
- boomerang will stay airborn. A very well behaved boomerang will come back
- to you sweep in low pull up just over your head and hover down. The more
- spin you put on it, the more likely this is to occur. There are plenty of
- exceptions too of course.
-
- My favorite homemade is a large triblade which when thrown with good spin will
- cut a nice oval anever getting more than about 6 feet off the ground, but as it
- turns for home it drops down to about 3 feet and starts to level out (flatter
- angle). Around 15 feet out it pulls up and stalls about 25 feet above my head.
- At which point it starts to fall straight down. It however does something that
- I've not seen others do. The spin rate increases dramtically as it falls to
- the point where I can hear it whistling. It's possible to catch it by clasping
- it from above and below, but a miss is deadly. I've bruised my hands a few
- times. Bliss. ;)
-
- >I know about true side-arm being bad. I wasn't thinking and threw one almost
- >purely sidearm and boy, did that give me a sore muscle! However, I had not
-
- Generally it's more than that.. When you throw a boomerang sidearm it tends to
- do 1 of 2 things.
- 1. It carves a nice arc straight out and up eventually ending up upside down
- at which point it can generally go in any direction at all. If you've ever
- thrown your boomrang upside down, you'll find that some of them can fly
- for very long distances upside down albeit a bit unpredicable. I've seen
- more boomerangs lost this way than any other.
-
- 2. The other thing they do is start by flying straight out and up to about
- 90 degrees angle (angle of the boomerang to the horizon) at which point
- they lose all steam and start to lose altitude before there is enough
- airspeed to get it to curve back towards you. Ussually the rang ends up
- picking up a tremendous amount of speed just before it slams into the ground
- at about a 60 degree angle. I lost a nice rang to an idiot this way.
-
- >noticed any tie-in between angle from vertical and flight pattern (circular vs
- >elleptical vs straight out and back). Perhaps I had too much wind for that
- >to have any effect on the flight path. That is another think I'll have to
- >check out.
-
- The more vertical the more likely it will fly a circular or eliptical
- pattern. If you go more horizontal, it will go out, up over down and back
- tracing a distinctly different shape. I think even xrang will show you this to
- some extent.
-
- >Why don't you like the plastic ones? Mine is wood, but I was thinking of
- Looks to me like he doesn't like them because they don't do well in heavy
- wind. I've seen very few plastic boomerangs with any weight.
-
- >building some of my own as I progress and was thinking of making one out of
- >some plexiglass I have, just to see how it worked out.
-
- If you feel like cutting your fingers of, this might be fun. Plexiglass
- will do a few things. It will spin very fast but not give you much
- lift. I doubt it will ever come back, and if you try to catch it, you
- risk knocking your fingers off.. Although I suspect the most likely
- outcome is that it just smashes when it hits the ground. Just a couple
- predictions. I've seen em made from everything from foam to aluminum.
-
- I find that wood is much more rewarding. If you can, find some 7 ply
- marine grade plywood. Mohaghany is nice to work with. This and a
- spokeshave are all you really need. My best are three bladers and
- are covered with marine epoxy (more flexible than what most people think
- of as expoxy) with a varnish coating. The duals are a little harder to
- tune as they are not symetrical, and most of my better ones have been
- broken or lost or both simply because I threw them a lot. Such is the
- price you pay. I wrote an article or two a long time ago about building
- rangs. Does anyone know if this group is archived anywhere?
-
- >Bill
-
- ian
-