drift trike build - santa rosa junior college · actual built drift trike. the drift trike has an...
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Drift Trike BuildChris Cao, Luu Nguyen, Anthony Vu
Jan Kmetko, PhDSanta Rosa Junior College
AbstractBuilding a Drift trike offers a recreational
approach to applying physics and the
engineering knowledge obtained in lower
division coursework. Applications including
wheel sizing, spacing, center of mass, weight
distribution, engine properties, and brakes are
main physics and engineering related
concepts to consider. However, factors to
consider when building the drift trike consist of
design, cost and the power to weight ratio. As
an example, since welding and effective part
scavenging played a key role in dictating the
quality, we needed a material that offered an
affordable cost to strength ratio and also had
no troubles with warping during welds. As a
result, we decided to go with 1 ½ “ by 1 ½ “
by 1/12” steel tubing. The results of
considering all of the above concerns can be
seen in the pictures and actual built drift trike.
The drift trike has an estimated stress rating of
571 PSI without taking into account the added
strength due to the design, and is makingapproximately 17.5 HP.
Results Cont.
Conclusion and Discussion
Materials & Methods• 1 ½ “ * 1 ½ “ * 1/12” * 20’ Steel Tube
• 1 x 212 CC Gas powered Engine
• 1 x 36” Rear Axle with a ¼ “ Keyed slot
• 4 x 1 “ axle bore Wheel hubs
• 1 x 1 “ axle bore sprocket adapter plate
• 1 x 1 “ axle bore Sprocket
• 2 x 6” diameter Wheels
Introduction
• Designing and fabrication of entire base frame.
- Cost
- Sourcing the metal for the build
- Welding
- Cutting Steel Via abrasive wheel saw
• Additional parts i.e. Axles and wheels
- Sourcing of additional parts
- Necessary modifications of addition parts
Materials and Methods Cont.
Frame
• 1 ½ “ by 1 ½ “ by 1/12” by 20’ Steel Tube
was used as the main component for
building the frame
• Without the actual frame put together, 20
ft of 1 ½ “ by 1 ½ “ by 1/12” can withstand
up to 571.2 PSI
Advantages
• Readily available, and has a great cost to
length ratio
• Ready to cut via Chop saw abrasive blade
• Much easier to weld compared to aluminum
since aluminum has problems warping due to
the heat transfer during the weld
Disadvantages
• As a result of steel being much heavier
than aluminum, unnecessary stress is
added to the engine due to the added
weight
Chris Cao Welding the connecting
bridge for the Frame
Results
Welding
• A Miller Millermatic mig welder was used to
bind all of our and steel.
• When welding, a “C” technique created
nominal beads holding everything together.
• The settings used to bind the steel frame
together was 150A @ 5V, and 150A @ 6V
for steel to cast iron and steel to aluminum.
Austin Harris
Finishing up the
welds for the frame
Welder is a
Millermatic DV-
2
Assembled Frame
• For the frame we all agreed on a
rectangular design.
• A rectangular design has fairly
simple welding points, while also
offering ample amounts of
flexibility for part placement.
Stress Test
We tested the weakest point of our frame, the
cantilever, for a rated force of 8000 lbs. The
max displacement in the z direction came out
to be approximately 0.034 in. which is
basically unnoticeable.
How the power gets to the ground
• Engine starts via recoil pull
• Drive shaft spins with the centrifugal
clutch mounted on
• @ 2000 RPM or greater, the clutch
engages, and the gear is allowed to
rotate itself and the driving sprocket
• Driving sprocket rotates the entire keyed
axle, and wheels are allowed to rotate.
Once the frame was complete, the bearing mounts
and the front fork of the bike were welded to the
frame. The bike was cut using a saw-zaw. The
bearing mounts were made of cast iron, so increased
heat and reduced cooling had to be factored in. After
all the remaining fabrication was completed, the
wheels, axle, engine, and sprocket were bolted on to
the respective places
The results of considering all of the above
concerns can be seen in the pictures and
actual built drift trike. The drift trike has an
estimated stress rating of 571 PSI without
taking into account the added strength due to
the design, and is making approximately 17.5
HP.
AcknowledgmentsThis work was supported by the Mathematics,
Engineering, Science, and Achievements
association by generous funding. Also, big
thanks to professor Jan Kmetko for
overseeing this project, and helping us stay on
schedule. We would especially like to give a
big thanks to Austin Harris, Brett Hecker and
Chris Silva for the time and effort they
invested into the build.