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Today's session didn't prove anything startling, but it goes well enough at half throttle. I am printing a huge spacer for next time so the jet outflow will be right out the water.
CB24 E1 tr_00_02_30_13-4-2024 19_57_19.jpg
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https://youtu.be/Sch8nPrcagE?si=wpmyHzRugtLb4iEHCB24 E1 27_00_00_08_28-4-2024 10_35_58.jpg
Great run yesterday she's flying now.Comment
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E1 hydrofoil
Testing on the lake yesterday, it wasn't what I was expecting, very unstable. It took me all morning to realise what was wrong, I kept noticing a silver stream from the right foil under the water, added to which more spray on that side. So when I moved them forward the right side must have been set at a steeper trim angle. I needed a way to prove it, I decided I needed to hang the boat from it's nose which turned out to be very easy and effective, see photo. With my biggest set square I found the right foil to be 2.5mm further forward. I now have a way to get them equally set up. Whilst hanging I noticed some distortion on the surface, which must have happened due to travelling at speed under water . Luckily I made the sections removable, so it was easy to file and sand then repaint.
I will add yesterday's video, see if you can see what I saw.
https://youtu.be/LiIbwDoU9fc?si=30SmtjKeUnzvXQMb20240505_162154.jpgComment
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Yup it does definitely look like one side is up ahead of the other. And a little spray here and there ahead.Comment
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CB24 E1 B_00_01_09_17-5-2024 07_10_19.jpgMaking progress by reducing weight, lost 750grams so far. Still trying new rear foils, and the main foils are now 50mm further forward!
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E1 hydrofoil prop outboard
Been busy today on the lathe making new parts for the propeller version of the hydrofoil outboard. Don't think I'm far off hope it's worth all the effort. I guess I can re use some parts on a new normal outboard if it fails. I will pack with grease before assembly and maybe add a greasing point somewhere. The jet version is good to go after major repairs. It had a failed bearing, and needed a new shaft.20240527_155131.jpgComment
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I've ordered the 44 inch hull after some full size drawing of both hulls and the one I'm using now, it seemed the best. Also if I decided to square off the nose like the full size then it would become nearer to 38 inch long. I will stick to a 30mm x 2mm stainless Steel core, because I know it works, it has a spring to it with out loosing it's shape and the way those foils bounce through the waves carrying the weight its needed. The side panels will be let right into the hull and glassed in place this will give the foils a sound base to tighten onto. The angle of the foils has been reduced by 10 degrees.20240604_170016.jpg20240531_184654.jpg20240531_184621.jpgComment
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E1 hydrofoil
The new outboard is ready for its maiden run, however its our club open day today so not the best time to be testing. I might have a quick run just to see what happens. I am taking 5 boats all with outboard motors on them plus a spare jet outboard which I could sell, but I don't think that's very likely. I will be towing a wake boarder round with my Neptune rib for the crowds, weather is cold but no rain forecast. I have a new captain on the rib so I have been busy making a film for YouTube to be released soon, I got nearly 3000 views last month and 4 new subscribers. The F1 will be getting a run, and from the far end of the lake at speed she is quite a sight .20240607_134254.jpgComment
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I like the look of the O/B. The swept fins should be real helpful. Is that a new addition or development? Good luck at the open day and congrats on the YouTubeComment
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It went well, I like the new engine, though ventilation is occasionally happening on sharp corners, needs working on.
The new foil was drawn as a 500mm ring then a small section chopped out, it did the job, it could be smaller I think. It was printed vertically to get a good finish.Comment
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I decided to stop copying the full size and find my own solution.......20240617_144647.jpgThe new foil is half as thick so as thin as I could get it, it is also swept back a bit more by cutting it from a 300mm ring at the drawing stage. The motor has been lowered about 30mm which included adding a different steering arm. Finally I made a pin and drilled some 1.5mm holes in the pivot this gives 3 positions for tilt and prevents any slipping, I had to do this on the F1 too , it saves having to get the screw very tight. The printer threw a wobbly yesterday, new part ordered so no printing for a couple of days, I'll get withdrawal symptoms 😫Comment
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