Crankbait Testing

Discussion in 'Tackle Making' started by goolies, Dec 4, 2008.

  1. I'm toying with the idea of building something to test the action of cranks and I have a question. If you were only interested in seeing the action of a crank and not in seeing it's diving depth, what size water channel would you need? Minimum width and minimum depth? I was thinking 5-6 inches wide and 5-6 inches deep. I would be interested in other opinions.
     
  2. AtticaFish

    AtticaFish Jiggin Freak

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    Don't think 5"-6" width will be a problem if they are tuned right. Just about any crank will run at least 6" deep and will bump the bottom and change it's action. Think you will need to go deeper. Maybe a 10-20 gal fish tank but not sure how you could get any flow.
    Thats my thought.
     

  3. The diving depth of the crankbait can be kept shallow by making the tow line short (6-12" in length).
     
  4. Sounds like the fish tank idea would work alright. I would be more interested in the leader length you'd use once you established a decent flow. Divers would have to be restricted to a short leader & lower flow for observation. Good luck. Sounds like a potentially lucrative product once developed. I've seen something like it at the Travel Boat & Fishing Show in Cincinnati. It was used to display jig & worm action.
     
  5. Check this out....here is one of rapala's test tanks....nothing fancy all by hand. Works for them......

    [​IMG]
     

  6. Thanks Rod, but a 500 gallon tank may take up to much room in the garage. :)
     
  7. Andy I have a 125 gal fish tank i've been trying to sell 6'longx18" wide
     
  8. Thanks for the offer on the tank chappy. I really want to focus on building a system with flowing water instead of a tank where I need to drag the lure. I want to be able to consistently reproduce lure speeds while making observations and taking measurements. Dragging lures at 1.5 ft/sec (1 mph) to 4.5 ft/sec (3 mph) by hand makes that difficult. If you haven't noticed I'm more into the science and engineering side of lure design than the artistic part.
     
  9. Sounds like you are looking for a 30 gal (or so) tank. You might look for a “breeder” tank. These tanks have a rectangular footprint; however they are usually only a 5-10 inches tall. All you‘ll need to do is put a “power head” in one end and watch the water run … (One source for the power head is http://www.aquariumguys.com/waterpumps1.html)
     
  10. Thanks Pete. I'm very familiar with that thread. It's a very interesting discussion. I started this thread here to get opinions on what size water channel would be needed to effectively test the action of a lure (not diving depth). Do you have an opinion? Width? Depth? I have narrowed my ideas for possible ways to do it down to 3 and will most likely build something before this winter is over.

    Andy
     
  11. Goolies - Here is 3 addresses, one each in Canada, U.S and Australia, all are pretty large setups, but I suppose you could scale them down a bit. The common thing in all three is a large reservoir of water flowing through a narrow neck into a receiver tank (downstream), speed of flow seems to be regulated by how much is pumped from the reciever back to the reservoir. This (Speed) could be esaily controlled by having a valve on the inlet side of the recirculating pump.pete
    http://iar-ira.nrc-cnrc.gc.ca/aero/aero_8f_e.html

    http://www.rollinghillsresearch.com/Water_Tunnels/Model_0710.html

    http://www.dsto.defence.gov.au/research/5108/
     
  12. Neat stuff Pete. It's funny that one of my 3 ideas that I'm still cosidering is very similar to what is shown in these links. I have sketched an idea to connect to small tanks up high with a testing channel. The water would be pumped from one tank to the other via a pipe. A valve on the outlet side of the pump would be used to throttle flow. The changing water levels in the tanks would create flow in the channel. It is one of my simpler ideas and probably the one with the least risk of failure. The only problem is that a 5" wide by 5" deep test channel flowing at a velocity 2.5 mph requires a pump capable of producing 285 gpm. The only way to get that kind of flow at an affordable price will be a pump powered by a small gasoline engine. I have not ruled this out but it would not be ideal for use in a garage.
     
  13. Gee Goolies, 285 g/min (1200 l/min or about 2/3 of a ton)) sounds like a lot of water, the biggest fire pump we have around here does 3200 l/min. I am going to have to go back to fire school and get my 'pump sums' out, surely we can do better than that. pete
     
  14. Area x Velocity = Volumetric Flow Rate

    5 in. x 5 in. x 2.5 miles/hour x 63360 in/1 mile x 1 hour/60 min x 1 gallon/231 cubic in. = 285.7 gal/min

    Yep. It's a lot of water Pete. That why I was asking everyone for their opinion on water test channel size. If I go with a water test channel 5 inches wide and only 4 inches deep I can get the water flow down to about 229 gallons per minutes. Here's a link to the pump I found. It has a 6.5 HP engine to develop that kind of flow.

    http://www.duropower.com/item.asp?PID=184&FID=8&level=1
     
  15. Goolies - I got the young guys here to work it out, and they concurr with yours ( in metric of course), still can't believe the volume!! How about the circular tank with a pump idea?? Variable speed (from centre outwards), years back I saw Rapala was using one with a water wheel in the middle, and motor suspended above (tank was about 6'-8' dia x 18" deep).pete
     
  16. I posted a similar concept in the test tank thread on Tackle Underground. An oval test channel with a means of simply circulating the water around. This would allow you to take advantage of the momentum of the water and reduce your overall power requirements. This is the concept I would really like to pursue because I have an idea for a water circulating device that should only require a 1/4 HP to 1/2 HP electric motor. I prefer an oval test channel with a stretch of straight flow over a circular tank. Something about the constant circular flow just doesn't seem right. I'm not sure how that might affect the action of the lure. I think it would need to be very large in diameter. Maybe that is why Rapalas tank was so large. Not really a bench top tester.
     
  17. I played around with the wind tunell thing for a while, all I could get was 'death spirals'- Keep us posted, there seems to be a large core group of people looking for the 'Shangrilah' of test tanks.pete