Being not a "serious" indoor flyer, I guess I need some info here..."Why
does one need such thin rubber?"
I used to coach the new kids out of college in structures engineering and
one thing I would mention to them is we would take the worst value ever
found in a material's strength, multiply by 0.6 and then multiply the stress
analysis by 1.2 for a safety factor and the analyze to 15 decimal places.
Or, how good is "good enough?" Is the rubber dimension really that
critical relative to the other parameters on an indoor model? I would think the
quality of the cut is more important in controlling the rubber dimensions.
I use an anvil type dial gauge micrometer when measuring the rubber and I
would suspect that squeezes the rubber a bit and has an error of about
.002"...
I may be wrong in my thinking, but then again I'm always at the bottom of
the placings too. Of course, my flying is limited to the 2 or 3 times a
year at the club events. I find indoor fascinating and fun to fly and enjoy
watching you big guns who REALLY know how to do it.
Regarding the ability of a slitter to cut a clean edge, my experience with
sheet metal and glass slitters says that the larger the diameter the cutter
wheel, the cleaner the cut. This has to do more with the cutter lead
angle as the material that is being fed. And, I would think, with a soft
material, the thinner the wheel, the cleaner the cut...sharpness being
expected..."slicing" the soft material rather than "shearing" it.
Again, just my humble thoughts.
Rick Pangell
Editor of "The Max-Out" Newsletter of
The Magnificent Mountain Men FF Club of Colorado
In a message dated 3/16/2011 9:58:44 P.M. Mountain Daylight Time,
phedon21t_at_yahoo.com writes:
Resharpening the circular blades to an absolute surgical sharpness could
cut to almost zero thickness.
____________________________________
From: John Kagan <john_kagan_at_hotmail.com>
To: Indoor_Construction_at_yahoogroups.com
Sent: Wed, March 16, 2011 10:02:16 AM
Subject: [Indoor_Construction] Re: Rubber strip, was How small can you go?
The best so far, in my experience, is Wayne Johnson's Geauga Precision
Models rubber stripper (like the one Sanborn recently snagged).
It can reliably cut .005" with a very clean rectangular cross-section. The
others I've owned (Oppegard (sp?), Wayne's modification to the Oppegard,
that round one from Australia, etc.) cut more of a trapazoid shape. They can
get close to that thickness, but vary a bit and can "bottom out" leaving
you with breaks in rubber.
All this is a tease, of course, since that stripper isn't available
anymore.
When you say "Peck" stripper, are you talking about the clone of the
Polish stripper that A2Z used to sell?
--- In _Indoor_Construction_at_yahoogroups.com_
(mailto:Indoor_Construction_at_yahoogroups.com) , "joshuawfinn" <jwfinn_at_...> wrote:
>
> Phedon,
>
> I've got a rubber stripper. That's the only way I've been able to get
rubber thin enough to even fly it (or any other of my indoor ships, for that
matter). I'm at the limit of that instrument's capabilities, though. Rubber
less than .010 thick is insanity I guess.
>
> So...for those of you who have higher end rubber strippers, how thin can
you go and get consistent results? Mine is the Peck Stripper, but I've
heard there are others that can provide more precise cuts.
>
> -Joshua
>
> --- In _Indoor_Construction_at_yahoogroups.com_
(mailto:Indoor_Construction_at_yahoogroups.com) , Phedon Tsiknopoulos <phedon21t_at_> wrote:
> >
> > rubber stripper
> >
> >
> >
> >
> > ________________________________
> > From: joshuawfinn <jwfinn_at_>
> > To: _Indoor_Construction_at_yahoogroups.com_
(mailto:Indoor_Construction_at_yahoogroups.com)
> > Sent: Tue, March 15, 2011 4:28:12 PM
> > Subject: [Indoor_Construction] Re: How small can you go?
> >
> > Â
> > Ignacio, I've tried flying it in a decent Cat II site, but keep
hanging up. I
> > don't have access to any really good sites. We've got a Cat III on
campus, but
> > it has terrible drift.
> >
> > Good, thin rubber would be very welcome. I really want to know how I
can do it
> > myself, of course, but I haven't received any comments of that nature.
> >
> > -Joshua
> >
> > --- In _Indoor_Construction_at_yahoogroups.com_
(mailto:Indoor_Construction_at_yahoogroups.com) , "izgo" <izgo_at_> wrote:
> > >
> > >
> > > Joshua,
> > >
> > > Wonderfull!! I love P-25.
> > >
> > > 5+ minutes can be done in a cat-II place where you can touch. My
better times
> > >is with motor about 40cm (16") long and weights 1.2 grams. Loading
2400 turns.
> > >
> > > On the 0.005" rubber i have to check if i have some. Because I saved
a lot o
> > >lateral cuts (a pre cut) done into used wakefield used motors. If I
have
> > >something close I can mail you some rubber.
> > >
> > > Ignacio.
> > >
> > >
> > >
> > >
> > > --- In _Indoor_Construction_at_yahoogroups.com_
(mailto:Indoor_Construction_at_yahoogroups.com) , "joshuawfinn" <jwfinn_at_> wrote:
> > > >
> > > > Ignacio,
> > > >
> > > > Yes, I do have an Argentine P-25 (my own design) which is double
covered and
> > >features full geodetic construction. It's a good plane; flew right
off the board
> > >with nary a bad habit, other than needing a lot of ballast to make
the minimum
> > >weight. I need to get it back...it's about 35' up stuck to the
ceiling of an
> > >indoor tennis court right now. Try as I might, I can't get it past 3
minutes,
> > >mainly because it keeps running into things. Maybe I'll take it to a
higher site
> > >sometime and get it to fly for real.
> > > >
> > > > -Joshua
> > > >
> > > > --- In _Indoor_Construction_at_yahoogroups.com_
(mailto:Indoor_Construction_at_yahoogroups.com) , "izgo" <izgo_at_> wrote:
> > > > >
> > > > > Hi Joshua,
> > > > >
> > > > > Very nice! Hard to cut rubber at that size for the little plane.
> > > > >
> > > > > Also saw other videos in your channel and I found 3 about
"P-25". I'm just
> > >curious abut if those models are the same as described in folder
Argentina nats
> > >- P25 rules?
> > > > >
> > > > > Ty, Ignacio.
> > > > >
> > > > >
> > > > >
> > > > > --- In _Indoor_Construction_at_yahoogroups.com_
(mailto:Indoor_Construction_at_yahoogroups.com) , "joshuawfinn" <jwfinn_at_> wrote:
> > > > > >
> > > > > > This was an experiment to see just how far such a thing could
be pushed.
> > >Apparently it can be pushed further. Anyone know how to strip rubber
down to
> > >.005"?
> > > > > >
> > > > > > http://www.youtube.com/watch?v=XI0x6DPxWYg
> > > > > >
> > > > > > Enjoy!
> > > > > >
> > > > > > -Joshua
> > > > > >
> > > > >
> > > >
> > >
> >
>
Received on Fri Mar 18 2011 - 08:59:42 CET