JOHNNY AIRTIME’S
20 RULES OF RAMP DESIGN
This list will come in handy when you're designing a ramp.
Although the 20 Rules of Ramp Design doesn't give you any specific information
on ramp structure, materials or drawings, it does give you the freedom to pursue
the more important aspects of good ramp design. You can create a ramp that complies with these rules
and you'll have a good one when you do. These rules
should be followed as a minimum.
1. Ramps need to be portable. "Albatross" ramps (blocklike,
solid non-collapsing structures) are difficult to transport. Don't depend on 18
wheelers to haul your ramps - it's not necessary. Design your ramps for
portability. You should be able to pull your ramp on a 16' flatbed car hauling
trailer so you can park it in a normal parking lot, only taking up two spaces
with the truck and the trailer. This is more convenient than a 40' long trailer
and it eliminates the additional costs of putting a 40' trailer on the road,
stopping at every truck scale, etc.
2. Ramps need to be shaped for the kind of jumping you intend to do.
Distance? Freestyle? Quarter pipe? Constant radius? Elliptical transition?
Decreasing radius? Increasing radius? Don't just look at a Kraft cheese
commercial as a way to design a ramp. Don't just take three straight lines and
connect them to make a ramp shape. Ramp design is a lot deeper than that. Learn
the limitations of each ramp shape. The right shape makes it easy to do
freestyle. The right shape makes it easy to do distance. Try to do one type of
jumping with another type of ramp and it becomes difficult.
3. Ramps need to be sized for the kind of jumping you intend to do.
Little ramps produce relatively little jumps. Don't try to break a world
distance record with a little ramp unless you just like working too hard,
risking life and limb and "overjumping" the launch ramp. Hitting a
little ramp in an attempt to break a distance world record is like hitting a
steep one foot kicker at super high speed. It's not worth messing with.
Another point on ramp size: if you're jumping obstacles that are 4' high,
it's cost prohibitive to build a 35 foot high ramp.
4. Ramps need to be well engineered to be very strong to withstand the
punishment dished out by a fat, aggressive pro riding a four stroke weighing in
at a combined 500 pounds stomping into the face of the ramp, suspension bottomed
out, wide open. That kind of force can bend a launch ramp's frame structure if
it's not burly.
5. Ramps need to be easy to set up. This is where a good design makes a
huge difference in your lifestyle. Make it easy to set up. This means a lot of
things. It shouldn't take machinery to set up the ramp unless you're building a
really big ramp. It should go together without a lot of stress and strain.
6. Ramps need to be quick to set up. Design it so you enjoy that
benefit. It takes longer to fabricate the ramp so that you can set it up on
location very quickly, but your troubles are over as soon as the ramp is
fabricated.
7. Ramps need to feel solid when set up. This feeling should be easy
and quick to attain with a properly designed ramp. Albatross ramps look solid,
but then you discover that they like to teeter on any bumps under the ramp. This
forces you to either (1) Groom the ground underneath the ramp over the entire
footprint of the ramp and hope you don't high center on a 1/2" pebble, or
(2) Shim the ramp underneath, all the way around. Both options lag.
8. Ramps need to store small. If you need a huge construction yard to
store the damned things, you'll wear out your welcome at the construction yard,
that's for sure.
9. Ramps should be reasonably cheap to build with the best quality
materials you might need without overkill. It wouldn't be very economical to
have a huge ramp frame machined out of solid billet 7075 T-6 aluminum. You also
wouldn't want to buy three times the material you need to get the job done
right. Proper design and engineering will keep material and labor costs down.
10. Ramps should be built to last. It takes so much effort to build a
ramp. It might as well be built to last the test of time from quality materials,
properly engineered. Don't build a ramp out of wood unless you like wasting your
time. You might as well spend a month building a snowman. The ramp will last
about as long as a snowman if you make the frame out of wood. Steel, my man –
STEEL! Don't even bother with aluminum.
11. The design and parts of a ramp should be standardized. When you bolt the
sections together, they need to be a certain exact distance apart, using the
same size bolts throughout the ramp structure, the plywood gets screwed down
with one specific type of fastener, and the ramp deck frame, leg and brace
designs should reflect a consistent theme. Funky, odd, cumbersome braces and
overly complicated and different parts make a strange looking contraption that
is hard to set up fast and hard to repair when a part gets bent and if a part
gets lost, it might take too much fabrication time and running around to find
these weird parts made of unobtainium. If it takes 12 different types of
fastener to assemble the ramp on location, it creates problems: you lose
off-sized bolts and have to replace them, you have to maintain 12 different
types of bolts and other problems will crop up.
12. Ramps should be made with a simple design, from commonly
available materials and hardware. If you are the only guy in the world who
knows how to put your highly complex and weird ramp together, you'll have to be
there every minute of the way, every time, for setup and teardown. If the ramp
doesn't construct in a step by step, simple and straightforward way, it might
even be dangerous for the crew to handle heavy, cumbersome, off-balance pieces
above their heads. Keeping it simple keeps it easy to learn for your crew, easy
for you to teach others how to set up, and every aspect of the operation goes
smoother. Simple things just work more consistently and reliably.
You also need to use commonly available materials and hardware when you build
a ramp. Making a lot of funky, one-off parts and complicated structures are a
waste of time and make for chaos when you damage or lose a part. Complicated
things involve more human error factors, more mechanical failures, more
manufacturer's defects, problems that are more difficult to figure out quickly
and the benefits you gain with more complexity are sometimes canceled out when
you aren't able to perform because your ramp fails to work when you need it.
13. Ramps should be made of relatively few parts. This point is
related to keeping it simple, standardizing, keeping it cheap to build, building
the ramps to last, making it easy to set up, making it quick to set up and
making it portable.
14. The ramp frame and deck should be protected with the proper
coatings. A bare steel ramp frame needs to be cleaned, then painted with an oil
base primer/sealer. Rust can be quickly removed with a 4" grinder with a
heavy duty twisted wire wheel. Re-paint scratches that go to bare metal. The
frame can then be painted with gloss paint, but it's okay to just go with the
oil base primer because ramps get scratched, slid across pavement and concrete,
stacked up with sand painted decks sliding across painted steel and they go
through some rough handling and guys with oily gloves that put marks all over
the ramp. People step on the ramps while they're stacked up, putting unsightly
footprints on them, and all kinds of things make them look bad. You just have to
clean them up and re-paint them every once in a while. The deck should also be
painted first with a primer/sealer on both sides, then screwed to the ramp deck
frame.
15. The ramp deck should be made so that the rider gets traction when
he's on it, even if it's wet. The best way to do that is to paint the deck with
sand paint. Sand paint is expensive, but I like to make my own, which costs a
lot less. Sand paint the way I make it consists of masonry sand with gradient
particle size mixed with a 5 gallon bucket of flat exterior latex paint. I find
5 gallon buckets of flat exterior latex for $50 to $60 these days, and that
price has been pretty consistent over the last 10 years. Masonry sand is $3 for
a 60 or 90 pound bag. So, it costs me $10.60 per gallon if I throw all the extra
sand away after I paint, but if I keep it and mix it in the next bucket, the
price actually works out to about $10.10 per gallon.
16. The joints between ramp sections must not fail. Therefore, to ensure
against ramp failure, backup systems should be incorporated.
17. The ramp should be easy to repair. For instance, when you screw
the plywood down to the ramp, plan on replacing it eventually. If you take care
of the steel frame, it will last many, many years. The plywood will get hammered
and will need to be replaced more often. You can keep paint on all of it, but
one time I had to leave my ramp in the mud and standing water in northern
California for a month. It suffered some plywood delamination damage as a
result. Things like this can happen to the best of us. Therefore, when it's time
to remove the plywood, it can be a real pain when you see that the primer and
the sand paint filled in the phillips heads on all the screws. It dried and
hardened, and now you're in a hurry to remove them. Well, you better get out the
small flathead screwdriver, an awl, a pocket knife and your dental tools to pick
the paint out of the phillips heads. You might even have to use a pry bar and
snap some of the bolts under a tensile load.
I use a more convenient method. I use tek screws with a bolt head, and even
if they're covered with paint or sand paint, when I take my 1/2" drill with
a socket attached and push it down on the bolt head, it shears the paint off the
faces of the bolt head and works like a charm. Another thing the tek screws
should have is ears. The drill bit on the end of the tek screw starts drilling
the hole in the plywood, then the ears hit the wood and bore a slightly bigger
hole. The drill bit breaks through the plywood and hits the steel, drilling a
hole through the steel. Then the ears hit the hole and break off. The screw
threads start tapping into the steel where the ears broke off. The screw threads
don't grab the plywood and raise it off the steel deck frame as you drill
because the ears cleared a hole through the wood big enough for the wood to
clear the threads.
18. The ramps should be easy to fabricate. It takes a lot of work to
build a ramp that satisfies all the requirements of a good ramp, but there are
many ways to build a ramp. Eliminate lots of cuts, lots of welds, lots of grinds
with sound design. Eliminate excessive material handling, difficult work, time
consuming processes that are less effective than quicker methods. Some
operations can be done with two people, some might require more. Always have
enough people so one can hold the material in place while the other welds, two
people can carry a heavy piece instead of one person straining too hard, and
when you need lots of people, schedule them, get them in, let them do their job
and go home.
19. The ramps should be quick to fabricate. Going back to the idea
that there are lots of ways to build a ramp, you might as well design it with
pieces and segments that eliminate a lot of excess time in fabrication.
Sometimes you can spend a little more on certain materials that are strong
enough that they eliminate a lot of manhours trying to create a weblike
structure out of spindly frame members.
20. The ramps should be easy to expand. When you want to add height
onto your ramp, it should be part of the design to easily accept such additions
if necessary.