Who has the write-up about the beginning of the Intimidator hull ?
I've seen it here, I think, planned on saving it but forgot, thats what I do best now a days
Anyway --- The first hull the Anaheim plant had in mind for the new Intimidator was the sprint hull, an outboard hull, with a transom built up for up to a 200hp outboard, there is no "hook" in the sprint hulls, Art was a go fast guy. The 200 hp pushed the sprint 55 / 58 as the came, adding a performance prop and a light load the boats were easilly running a solid 60 + with the 200hp outboards weighed about 300lbs, hanging off the back of the transom, add gas tanks and batteries ? 18 / 20 gallons gas, 50lb battery, what? 500lbs, back there. here's my point, one of them, Adding the weight, about 600 lbs of a 260hp motor, 70 lb sterndrive only made sence, because most of the weight was forward of the transom, moving the balance of the hull forward only about 7" , they lake tested the boat, the Intimidator, and the boat ran mid 60's, most of us think that would be Great, but corperate didn't, they didn't want to sell a 60+ boat that size to the public, putting them at risk, So, they took the boat back to the shop, modifiesd the hull some, done another lake test, too fast, eventually taking a bucket of "mud" to the lake with them, added the little "hook" and something to the strakes, slowing the hull down to 58mph and corperate let them go with that, check it out, but thats my understanding.
Point two, how many pilots do we have here, besides me, just saying, when is the only time you want to use the flaps on an airplane ... to slow it down, and what happens when we add flaps, it drops the nose dramatically, so we have to add trim "up" to the horizontal stabilizer immediately
to raise the nose back up. The trim tabs on a boat work the say way, but some for a different purpose, to raise a heavy stern, help it get on plane, pushing the bow down, also will eliminate porpusing on short boats with heavy motors, and off shore boats, fast boats, they use the trim tabs based on the surface conditions, to regulate the attitude of the hullat speed, but I think, any trim tabs positioned in a downward position, certainly forces more hull in the water and slows the hull down, and often, used correctly, the tabs result in a more stable hull effect, too much trim down is dangerous, in my opinion.
Go get the pop corn.
The little "hook" they created in the hulls of the boats we have, done two things, the created stability, but they also slowed the hulls down, but look at this fact, the Intimidator has the "hook"
as well does the Scimitar, but both only have the "hook" about 7" forward of the stern, my scimitar ran 78.2 by the gps with the stroker in it, same motor, same prop, same drive ratio, pushed Barb' intimidator 73, her boat is 3ft shorter and about 300/400 lbs lighter, so why is that ? the balance of the two hulls must be the reason. scimitar has a 36 gallon tank in the bow, intimidator has 27 gallon tank in the bow, but I also had a 16 gallon tank under the back seat, thats what I ran off of to go fast, only a few gallons in the front tank for good measure, but I still had to paddle once. The "hook" in most our boats are present in the step of the hulls out-side the first strake, then the second strake, on each side, my scimitar had the "hooks" but that baby had the speed to run on the surface of the hull between the first strakes, making the "hook" inefective, but Barb's boat, the intimidator, would not quite get out of the water that far, it's best speed was 73 mph, it must be balance, but thats just my opinion.
Barbs CV-23 is a different hull design, it has the "pad" and the 50 gallon gas tank is almost mid-ship under the floor, and that boat is running mid 60's with a 21 pitch powertech, 4 people on board, a dog and a cooler with a full tank of gas. Balance of the weight, being able to get the hull Up out of the water, is better for speed and performance, adding anything "tabs" to the stern in a downward position only slows a hull down.
More pop corn.
Back to airplanes, a lot of the glider planes have flaps now, more than just the "speed brakes" like they used to have, but they have Two functions, they also go Up some, as well as down to slow them down, they can raise them up some to increase their speed, quite a bit, and some unbelievable speeds from a glider at that point of flap position, not an altitude sustainable plan of course, but is the purpose of the positive flap increase, what's it doing? is straitening out the air passing over the wing, slower air, to catch up with the air going under the wing, faster air, making a result of the plane going much faster ... no different with boat hulls and water, nose up goes faster, nose down goes slower on water, but too much of either is counter active, thats my 4.5 cents worth.
