Ernie, I'm glad you appreciated my perspective. Give it a shot. What's the worse that can happen? You'll just have a lot of parts for another boat! :)
I'm going to guess that your best range will be at the speed your boat is just barely on plane. Plowing through the water below plane, but at high displacement speeds is probably going to be the worst. And, since a jet drive is very inefficient at very low displacement speeds, say 4-6 knots, that won't be good for range either. But, you won't know until you can log some data. Therefore, I suggest you design for minimum planing speed. If the boat still runs under IC power, then take her out and find what that speed is. It'll give you a target to design for.
If you need extreme range, I'd consider dropping an auxilarly unit over the transom like a Torqeedo powered by your batteries and then switching to back jet drive for planing only.
Dan
--- In electricboats@
>
> Well a little life! and thank's Dan for your input! Most I get is can't be done. Watch me!
> The more inputs I get , good or bad , the more knowledge-- I love it!
>
> Facts I've found in my investigation of converting a 16' Sea Ray f16 to elec--(my goal.) It's miller time , so this may be long (warning)
>
> As stated in my opening call for help and has anyone done this.
>
> 1.The Merc/force 90 and 120 hp 2 cycles are pretty bad, salt water doesn't help, can be rebuilt for $1,000 to $3000-- But how long would it last? I had thought about a MC engine--could do but the exhaust problem set me free on that.
>
> 2. EV cars now have alot of DIY people , and TELSA (wow) plus the hybrids--won'
> 3. OK for the displacement people ----Ever seen how quick a jet ski , or jet boat gets on plane.
> The DYI people are usilg Golf cart of fork lift electric motors and are very happy!
>
> 4.Ou U tube are Jet skis converted to elec--cool
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> 5.OK the prop range on my boat is 4800 to 5300 rpm.
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> 6. The motor at 5-7000(redline) worked it !
>
> 7. So my Question was --Has any one attempted this, and any one know of a elec motor that will turn this rpm without going exotic to ac, 3 phase etc. Pref series dc, one way, don't need a 2 direction motor. Seems to work Great for cars.
>
> 8 Not looking to go to Bahamas. When you think about it, if you go out boating--I have to contend with Manatee zones, 5mph, Intracoastal etc . and usually go clamming or fishing, so a day may consist of little full speed in a 4-5 hr period an average.
>
> 9. FYI--suggested get a displacement hull and go slow! I have a 25' Seaward, with a 9 hp yanmar diesel--that'
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> 10. I got the jet for getting the dog into the islands, maybe carrying a tent , STABILITY, and to go shopping for suplies while anchored out. I hate rubber boat's and a wet ass etc. (present). Try dropping a 45 pound dog into a rubber boat--better try and get the dog back into a 25' sailboat.
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> 11. Last, amen, -- ELCO has done it for years, and the Queen Mary and alot of new jobs run on elec. with thru hull drives for direction-- SO --help me with any more inputs
> Thanks Dan for a positive input !
>
> Ernie
> Vacationdoc@
>
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