Insanity or genious?

Kermit · Feb 23, 2015

Good luck getting encouragement. I quit watching the video when he said the boat being flooded at the time of the video shoot was irrelevant. I do have an answer to one question, though. Red.

uncledom · Feb 23, 2015

Kermit said:
Good luck getting encouragement. I quit watching the video when he said the boat being flooded at the time of the video shoot was irrelevant. I do have an answer to one question, though. Red.

You think out of the building that the box is in. LOL.

Kermit · Feb 23, 2015

uncledom said:
You think out of the building that the box is in. LOL.

It's a curse. Seriously.

srust58 · Feb 23, 2015

There may be a force more powerful than genius or insanity at work here....natural selection.

With a few exceptions a sailboat hull is a displacement hull and the hull speed is in large part determined by waterline length. It may be possible to get a displacement hull above it's hull speed but the horsepower required is way out of proportion to the small gain in speed. Do some internet research on displacement hulls and planing hulls. Removing the keel did little to increase the speed potential as again it's the waterline length that determines that in a displacement hull for the most part. You may be able to reach that speed with a smaller motor without the keel. Even with the keel the 9.9 should have been able to push you to hull speed.

I think by removing the keel you are going to have very low initial stability (it will easily roll/tip from side to side) and the ultimate stability (capsize) is anyone's guess. My guess is that it will be very stable upsidedown. I think you need to restore some of the ballast. How much? I don't even want to give anymore advice than that...I think this is a bad idea to start with. Get yourself a powerboat with a planing hull if you want to go fast.

Ron20324 · Feb 24, 2015

Why not follow that other thread and put a nice V8 in there for ballast? Well, maybe a 4-cylinder for your size boat.

srust58 · Feb 24, 2015

Forgot to answer the most important question. Yellow, all over. So it will be more visible when it is floating upsidedown or it is sitting on the bottom of the lake.

Kermit · Feb 24, 2015

futuristictech said:
Should I write "Call 911" under the boat so when capsize is visible?

Now you're thinking logically!

srust58 · Feb 24, 2015

Since you are so far along on this "project" I assume you will go ahead regardless of any advice you receive. I will add one more thing. By removing the keel you removed the foil that the boat pivots on when it turns. It looks like you are also doing away with the rudder and will rely on the engine pivoting for control. Good luck with that and give yourself plenty of room as there will be plenty of side slip and poor maneuverability . You don't have a sharp chine or a deep V that powerboat hulls rely on for pivoting in a turn and you got rid of the keel that sailboats rely on.

By all means paint "call 911" on the underside of the hull.....and practice holding your breath so you can swim out from inside the cabin or underneath the boat when it goes over. Please don't take any children out with you when you go out on the water.....seriously.

justsomeguy · Feb 24, 2015

Good luck.

Scott T-Bird · Feb 25, 2015

Why Knot?

That would be my suggestion for the name of your boat. Losing the keel eliminated a lot of your stability and directional control, so you will have to compensate, as it sounds you are doing. Do you have the version with the well for an outboard in front of the tiller? Are you going to use the tiller for steering? I'd put the largest size outboard your boat has capacity for - maybe like a 9 hp? Your top end speed should be higher than projected hull speed. I calculate your hull speed to be 6 knots based on the waterline length. Not sure how you arrive at 4.5. That's much too slow. The shape of your bow and light weight will certainly allow a speed greater than 6 knots with little additional effort. That formula is just a starting point. Your boat will hardly generate any wake that it has to climb out of, as the argument goes. I installed a 2 cylinder diesel in my 5,700 pound sailboat, which now runs at 7 knots (on a flat-water lake) where theoretical is just 6.3. I can see that you are not paying too much mind to the alarmists out there. :stirthepot: I suppose it was a free boat, so there should be no harm in doing what you like with it. If it gets you out on the water and provides a platform for camping, or whatever, what's not to like about the idea?

uncledom · Feb 25, 2015

futuristictech said:
I love the lines in a sailboat but my ignorance and laziness about sailing cut the mast and keel to make a power boat. So Now I got questions. (This boat will be use on a calm water lake in Keystone lake Oklahoma) 1.Would it capsize without a ballast? 2.Did somebody has done this before in a 22 footer? Without the weight of the keel 1300 lbs,mast 45 lbs, rigging and sails 65 lbs with a 9.9hp 2 stroke Johnson outboard 3.Did the hull speed change based on keel drag and weight reduction? 4.What kind of top speed you think it would climb? (Just curious) 5.Did the engine would handle the boat in a windy day? 6.What kind of mods would you do on it? 7.What color should I paint it? 8.What name can fit this boat? 9.Would it sink? 10.How much do you think it weights now? 11.If you don't like it, just leave the sailor out of you express himself with a #11 before the insult so all of us can fully understand your frustration. Look the video and the photo album in my profile to give opinion or criticize it. Please put the number of the question related to your answer for clear understanding. https://www.youtube.com/watch?v=c-wmKrT2SeY All info or critics would be deeply appreciated. Thank you for your time

I vote "insanity". Find a padded room.

cb32863 · Feb 25, 2015

The fact that it is actually "genius" may already prove the point.

srust58 · Feb 25, 2015

While still a bit dubious of your project I feel better that you are trying to address stability and maneuverability issue. I don't think I would look to hydroplanes for answers though...I would look more towards the trawler hull for ideas. You may be better off with a long shallow keel or even a short stubby fin. It would not need to be very deep like the old one. Not real keen on the motor mount either. If the bottom is in the water it will create lots of drag. Even with restoring some ballast I think it will have low initial stability due to hull shape, loss of keel and most of the ballast. It's not the end of the world but it will heel/tip from side to side easily but at some point it will stiffen up and should not go further in normal conditions. You may have to experiment with ballast.

justsomeguy · Feb 25, 2015

How about port and starboard-mounted pontoons?