To all....imitation is the best form of flattery. Sotme time back I put
out the attached little dissertation. It seems indoor model power systems
are the key component for a given model. If one had sufficient test dta for
a great performer, say Brett's or John's models at peak performance,a nd I
mean the rubber/prop system "as flown."
In my former life, the mantra was test like you fly. My thinking is you
need the whole flight profile for a give rubber/prop configuration. The
torque, prop dia, etc.
If this does not come through, email me directly and I will send it
directly to you.
This begs for somebody willing to get out the stopwatch and the meters and
make up the test fixture.
Rick Pangell
Editor of "The Max-Out" Newsletter of
The Magnificent Mountain Men FF Club of Colorado
In a message dated 11/9/2012 1:18:28 P.M. Mountain Standard Time,
j.bartek_at_sbcglobal.net writes:
Mike
Looking at your initial post, I see that you'll be using 5 X extension on
0.053 inch rubber for the start of your "wind to failure" test. Not sure
how long a loop would last stretched that far. I haven't used that much
stretch for Bostonians and such with wider rubber. Do you measure force to
stretch the loop with a fish scale or similar? Perhaps adding weights to a
suspended loop, like a high school physics Hooke's Law experiment would give
you that.
A starting point would perhaps use a 6 inch loop of 0.053 inch rubber
stretched between 2 No. 10 wood screws 18 inches (3X) apart in a board. The
larger wood screws might be smooth enough to keep the strain from
concentrating there.
I've got a box of FAI tan in 3/32 inch (0.094") and should generate some
preliminary data before we talk "exact" though.
Joe
--- In Indoor_Construction_at_yahoogroups.com, "mkirda_at_..." <mkirda@...>
wrote:
>
> Be happy to if you could write up exactly what you want me to try.
>
> --- In Indoor_Construction_at_yahoogroups.com,
>
> Maybe
> > > Mike Kirda could take some loops of his rubber and stretch them over
> > > some nails in a board, with and without lube, to give a "days to
break"
> > > number.
>
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Received on Fri Nov 09 2012 - 12:50:06 CET