Attendance
Problems to Solve
Leaks
Threads on outlet pump
ABS walls
Siphon
Can’t land on barrel 😭
Solutions
Leaks
leaks around threads on outlet - getting a cots fitting (metal - something like: https://www.mcmaster.com/products/pipe-fittings/thread-type~npt/pipe-size~1-4/gender~female-1/fitting-type~bushing/low-pressure-stainless-steel-threaded-pipe-fittings-9/ (must have internal threads) and adhesive like epoxy to lock this into a non-threaded hole in the bottom of the tank)
probably good enough in junction with teflon tape.
leaks through walls
1. flex seal
2. could try PETG
3. plastic bag
4. acetone bath
5. try layer of CF
Siphon
If there is still water in the tube (when the pump stops moving water) that extends over the looped point (tube extends over the arm to prevent this..)
1. secure tube higher with clip (or adhesive)
this could be a ziptie
2. different pump 😞
siphon prevention using air/vacuum manipulation: vaguely based off https://engineering.stackexchange.com/questions/8619/how-to-stop-water-flow-in-a-siphon .
pinhole in top of tube loop.
mesh gateway or something for air to escape but not water(?)
opening and closing this manually/automatically would be too much work, so would have to just be a membrane if this option is explored.
Barrel landing 😕🔫
Lower the pump on a winch
avoids swinging pendulum
pump could be attached/hanging via string/steel wire
fishing line attached to the legs/frame could ensure it doesn’t swing around
there should be a failure point, but not the line itself… likely a connection or something can yield if the pump gets stuck on something. cabling and tubing would be EXTREMELY hard to make predictably-breakable. however, with enough force (depending on quality of the push-to-connect fittings)… the tubing will pop out of the pump housing without requiring a dedicated breakpoint.
tubing and wiring must be somehow integrated and not breaking
any COTS options for winches…? not easy to find. would likely have to make a custom version.
must be fast and also not too jank idk
Tubing:
current tubing we have is relatively stiff plastic, essentially hydraulic machinery lines
a stiffer option like PVC or 3d prints:
folding arm
horizontal to vertical elbow
however, it would be impacting the sides of the barrel a lot. the drone cannot hold position within a meter.
pain in ass to integrate
flexible: it would be difficult to “aim” the swinging target
the tube has the pump on the end, which is a weight. but i think (megan) I think it will still not be enough to unspool straight.
buying tubing:
Other options…
just leave it hanging… 😎 🤙
Plan
Camilo to test leak stuff - flex seal
Megan to source a fitting, replace threads with fitting, Camilo + Evan manufacture
Megan to make syphon clip, Evan and Camilo
Alison to design winch integration
Evan and Camilo to see how far we can pump water up + how does tube react to being pulled taught and released - inform what other steps to take
If design is needed to control tubing, Camilo or Evan or onsite member