I need help designing a playground slide with a corner in it.

I need help designing a playground slide with a corner in it.

Post by ga.. » Wed, 24 Feb 1993 05:37:48


I took physics a long time ago, and I cant quite remember how exactly
to do the computations that I want.

I am in the position of having to DESIGN a slide for my daughter, as it
needs to turn a corner on the way down, and none of the established slide
manufacturers will do such a pretentious thing.  (Truth is, that it won't
fit into the yard any other way.) (There is a fishpond that my wife won't let
me take out in the way...)

I do not believe that I can find a company that will undertake the design
of this beast.  If anyone knows of such a company, please send me their name
address.

So, to get to the point:  The area of the slide where the 90 degree corner is
has to be banked in order that the slider not fall out of the slide.

In any case, here are the physical details.  The slide is to drop 7' over
the course of its run.  (Starts at 8' 2", and ends at 14" from the ground.)

The length of each of the sides is about 9'.  I.E. from the BACK of the top
of the slide to the outside edge of the bottom is 9', and from the outside
edge of the top to the exit edge of the bottom is also 9'.

The slide needs to turn a 90 degree clockwise corner on the way down.

The width of the slide (inside of the rails) is 22"

The top 3' of run, not drop, has to be straight before going into the curve,
and at least the bottom 2' has to be straight as well (due to the exit
chute area).

Now, my question is: How much does the middle of the curve on the slide need to
be banked?  I am going to make the assumption that the bank starts at the
start of the corner, and then banks back to flat after the corner, and that
that is O.K.  This may be invalid, as you continue to gain speed as you go
through the corner, and so, it may need to come back flat at a different rate
than it went to the slope in the center of the corner.

I am also going to make the assumption that the center of the bank happens when
we have fallen 3' from the top vertically (not slide distance traveled).  Now,
How much friction does a stainless steel surface have wrt to clothes.  I can't
remember, but it seems like a heavier object will accellerate faster down
the slope due to being able to overcome the friction better.  This means that
kids (40lbs) will hit that corner slower than ***s (200lbs), so the slide
should be designed for an average of 100 lbs (more kids than ***s).

If it were frictionless, then it would be easy to calculate the velocity at the
center of the corner.  Then we can say that we have a 7 foot radius (or 6.5'),
and we need to find the correct components of the angle needed to balance the
forces as you go around the corner.

Can anyone help me with this...  Some assumptions on the friction, and what
speed the corner might be taken at.  And then what the formula is for breaking
out the components of force on the angle.  (Its like got a TAN in it somewhere,
and like and ARCTAN for the other one.  At least this is what pops out of my
brain.)

Any help would be appreciated.

                John Stevens-Schlick
                5222 44th Ave S.W.
                Seattle, WA, 98136

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I need help designing a playground slide with a corner in it.

Post by Bill Buckl » Wed, 24 Feb 1993 22:19:09

Quote:

>>Subject: I need help designing a playground slide with a corner in it.
>>Date: 22 Feb 93 20:37:48 GMT

>>I took physics a long time ago, and I cant quite remember how exactly
>>to do the computations that I want.

>>I am in the position of having to DESIGN a slide for my daughter, as it
>>needs to turn a corner on the way down, and none of the established slide
>>manufacturers will do such a pretentious thing.  (Truth is, that it won't
>>fit into the yard any other way.) (There is a fishpond that my wife won't let
>>me take out in the way...)

>>I do not believe that I can find a company that will undertake the design
>>of this beast.  If anyone knows of such a company, please send me their name
>>address.

>>So, to get to the point:  The area of the slide where the 90 degree corner is
>>has to be banked in order that the slider not fall out of the slide.
>>..........

Why don't you get some ideas from those simming pool acces. companies (like
Bicknell, etc.) who manufacture fiberglass slides with 90 degree curves in
them?  Or look at some coasters that have done this (like the Anaconda)
for ideas on angles.