Actually, 1200 lbs of 480 kgs is not a lot of load.
Figure abou half of that for normal motor and batteries, so the real "extra" mass is maybe 240 kg.
Thats two big adults.
I see no issue with 2-3-4 extra people on board.
As far as pods, why not make one or have one made in steel ?
I cuold certainly make a steel pod in a few days, with a bolt-on washers (2 flanges, turned on a lathe, nitrile rubber seal in between, bolted with 6 mm shcs every 1.5" / 40 mm on a 14" diameter).
Dead easy.
100$-200$ in material, 3-8 hours with a lathe. welded endcaps.
Good to 3-10 bars, or up to 20-50 m depty immersion.
Replace the nitrile rubber seal every 10-20 openings, when changing batteries.
Any machine shop or jobshop in the us can make one in a few hours.
Use mild steel to keep it cheap, and coat with a paint on liquid rubber coating (good for permamnent immersion). You can have neon colors if you want.
Both connectors and cables are available in immersion proof varieties, or just seal with epoxy and have a 5 m pigtail come out (cheaper).
4 hours at 60% hull speed is going to take a LOT of batteries. Voltage makes a difference but as far as running time is concerned it's WATT-HOURS that count. Let's say you need your 2.5kw to get your required speed. 4 hours at that output is 10 kwh. A normal-sized lead-acid battery holds about 1 kwh. So you'll need TEN of them, MINIMUM. That's about 600# of batteries (probably more). If you want them to last you don't discharge them much more than 50%, so that makes TWENTY batteries, or 1200#. With that much extra weight on a 23 footer, propeller drag might be the least of your worries.
Willie
No comments:
Post a Comment