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As long as the prop is sharp it should be ok, perhaps a little less pitch? Prop shop in UK used to have a good variety of 1.2 pitch props. Or maybe just a two blade, that in itself is 1/3 lift. But you will you see when you run. I would think the back will lift repeatedly with this setup if there is too much lift. CG May help resolve it too.
Kudos for trying this! I am curious as to how runtime can be effected with the foils.Comment
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E1 Seabird
I am going back to my jet outboard for now with some modifications. A few hours today drawing a new streamlined pickup, it has an adjustable foil on the front, just 2 screws to alter the angle.
I can always try the prop again later, but I feel success will be easier this way.
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Thanks for your support! The prop version did work, but took a lot more effort so going back to jet outboard for now with a new intake and adjustable foil.
After getting the green foil made up and painted, I realised its a 2 minute job to change foils at the lake. Just pull out the 3mm ss pin and remove 2 screws. So I drew up another, quite a bit thinner, it's still in primer. This will be great for trying different sizes and shapes, and being able to change its angle too will help.20240301_153133.jpg20240301_154230.jpg20240301_154211.jpgComment
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Should be interesting. Luvin your O/B’sComment
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Thanks this project has been made possible by already having developed my own outboards. The pickup is held on with 4 x2mm cap head screws, if I could find some longer than 30mm I could add a spacer, then I could get the engine higher and keep the foil where it is.Comment
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E1 Seabird hydrofoil
E1 Seabird hydrofoil
Mixed result today, as I forecast the foils were way too big. Steering was affected too , so I've moved to a smaller foil and placed it further back. You will be pleased to see I've shaped it best I can for speed through the water. I've also allowed for more movement in the tilting angle. Finally it now has a sharp front edge. Just need to draw up that 20mm spacer ready for the screws coming from China.20240306_172344.jpg
I am printing a new battery tray that allows movement side to side and back and forth, this should help.Comment
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E1 Seabird hydrofoil
This is the new foil for Saturday. It reminds me of a shark with its mouth open from the front, guess that's no bad thing. It pivots well giving a good range of settings. Hope the steering is improved too from Wednesdays foil, speaking of which David at club said try cutting it down so I have chopped 20mm off each side. It gives me something else to try , but my hopes are pinned on the great white
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It was so cold and windy yesterday, so not good for making changes at the lake side. It did work but not as well as I thought it might. I really need to get that spacer fitted so the exit from the jet is into air rather than water, though its hard to see with all the spray. There's a new great white coming for next time, stronger, meaner, sleeker, and a little bigger. See photos, the printed foil has come out 10 times better by tipping it on its back and printing vertically.
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E1 hydrofoil
Took a while yesterday to get it lifting clear of the water, the answer was to add some negative pitch to the outboard foil. Running into wind seems to give more lift, guess thats air getting under the hull giving some extra lift. I have a few things to try now, like swap the motor for a lighter one, extend the hull to cut down splashing. Stop water entering through the steering port. A different extension to try , along with a stronger foil, it's prone to cracking at the pivot.
Video to follow.YouCut_202_00_00_01_25-3-2024 06_00_22.jpgComment
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E1 hydrofoil
Extending the intake doesn't seem to have any detrimental effect, this one has a longer point to the front and just rounded at the back, it will act as a rudder until its lifted clear of the water . Adding 1mm to each foil side seems to have made it a much stronger unit, I've set it with slight down trim as before.
So with decent bearings giving more power, a lighter motor, and a splash guard surely its got to be good, but I'm used to taking one step forward and two backwards.
Nick at the club wants 2 dummy outboards for a lifeboat rib he's building, they can act as rudders. It would have been a huge job to draw them, but I've realised I can scale mine to any size in Cura the slicer. So for fun I printed a 1/4 scale mid section, it came out perfectly and only took 1/2 an hour every screw hole is the size of a pin. The same part at 1/2 scale takes 2 hours, so still not too bad. I will tell him the good news today.
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Thanks Shawn
I tempted fate, so the ally plate did a great job of cutting out the splashing, but the price was more lift created at the back, Newton's law. So it pushed the nose down, I kept making adjustments all morning to get it working. Some success, but i can't review it on film because although Paul filmed all morning nothing recorded on his camera. I may have to reduce the size of the spray plate, but in theory it should ride high above the water line. I have printed another foil, this one carries the wings above the tilting adjustment slot. Then to compensate I have lowered the engine 10mm, will test on Saturday.Comment
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E1 hydrofoil
From this picture taken from yesterday's video you can see how the splash guard is doing a good job, glad I didn't get rid of it.
2nd picture, when I've had some fun developing the jet version, I can try the prop set up again. On the real machine that foil looks quite vulnerable.
If I can't think how to fix a foil to my existing outboard, then maybe design a dedicated gearbox with provision for an adjustable foil. To help with the torque problems I had last time I've been advised to switch to a sharp two blade prop, makes sense.IMG_20240330_155747.jpg20240331_054705.jpg
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