New 21 Pulsare setup! 93-94 mph!

[engineermike]

BK, you may be on to something. . .

The Tuff 21 website shows speeds of 92 mph with a 300HPDI and 102 mph with the 300X. Without starting a Yammie vs Merc pissing match, there isn't that much difference in power, and we've seen that on the Pulsare and other hulls. I talked to someone at Tuff and he admitted that just over 92 mph is where the hull climbs up higher out of the water, so it doesn't take that much power to go from 92 to 102 mph.

The point being that the width of the pad, deadrise, and location of the chines will determine the speeds where it takes just a little power to go faster, and the speeds where it takes a whole lot of power to go faster. On the Pulsare, right around 70-72 mph it starts to chine walk and most seem to find that it doesn't take much power to go from 70 to 80 mph. My theory is that's where we climb up on the last 2 chines. Perhaps if those chines were closer to the pad, speed would move up.

 

[WILDMAN]

On the life jacket thing, I posted under the description on Youtube that I got to the lake (20 miles) and forgot my jacket in another boat. I wanted to run the boat, and since it was calm and the boat handles well, I went ahead and droove it. I know it's kinda irresponsible of me to post the vid with no jacket, but I'm getting so old now, that if I didn't post it now, I may die of old age before I get to run the boat with a jacket.
On the prop, I think that they just pitched it wrong.

 

[82Diplomat]

"I may die of old age before I get to run the boat with a jacket".

Randy, thanks for the response. I don't know you...but live in your world through this site and so many others do as well. I was just surprised...and that's why I posted. BTW - I knew a guy in my hometown who was still drag racing cars into his late 80s. There's still many more years of your knowledge here. Good luck on reaching 100!

George

 

[ianz]

BK, you may be on to something. . .

The Tuff 21 website shows speeds of 92 mph with a 300HPDI and 102 mph with the 300X. Without starting a Yammie vs Merc pissing match, there isn't that much difference in power, and we've seen that on the Pulsare and other hulls. I talked to someone at Tuff and he admitted that just over 92 mph is where the hull climbs up higher out of the water, so it doesn't take that much power to go from 92 to 102 mph.

.

Yes that is correct about the Tuff but also remember that is a 300x not the 300xs that Wildman is using on the 2100. If i remember correctly the 300x is more HP and Rev's to 7000. I have a close friend who is currently rigging a Kevlar infused Tuff 21 with a 300xs and hopes for mid to high 90's.

Great video's Randy!

 

[JUPITER PULSARE]

Sweet vids! Looks like fun....

Need to run it in 6-8'' of chop and get a little air under it! Suprising the 28 and 30 hit the limiter at the same speed. Maybe the 21 Pulsare hull is "limited" to the ~95 mph due to drag coefficient/design? You and Bravo1 are both @ that mph and he probably has a bit more HP, proving your theory that it doesn't matter if the motor is modded or not.... unless you add significant HP the hull might be maxed out.

I don't know if the Pulsare hull is maxed out at 95 MPH but I do know there are improvements that can be made to the existing hull..All Checkmates have rounded or beveled edges on the lifting strakes, chines, and transom. If these edges were sharpened there would be a speed increase. With the rounded edges, water wants to "wrap" around the edge creating drag/friction vs exiting the edge cleanly.....

 

[Craig]

I don't know if the Pulsare hull is maxed out at 95 MPH but I do know there are improvements that can be made to the existing hull..All Checkmates have rounded or beveled edges on the lifting strakes, chines, and transom. If these edges were sharpened there would be a speed increase. With the rounded edges, water wants to "wrap" around the edge creating drag/friction vs exiting the edge cleanly.....

I don't know, Jup. maybe. There isn't much of the hull in the water at those speeds. I think they've always put those bevels in to ease in pulling from the mold and prevent damage.

-Craig

 

[SCT]

I agree w- Craig about not much of the pad being in the water at those speeds. It would be a small job to blue print and sharpen (plus dull the finish) the last few feet of the pad.
That would gain a mph or two. I also think an "X" motor would be a few mph faster then an XS Merc.

But I think Wman is looking for "stock" numbers with an engine you can currently buy.

 

[WILDMAN]

I have run many 300X and 300XS motors on Checkmates and Liberators. The speeds are exactly the same. Actually maybe a little better with th 300XS. More torque!

 

[JUPITER PULSARE]

I agree w- Craig about not much of the pad being in the water at those speeds. It would be a small job to blue print and sharpen (plus dull the finish) the last few feet of the pad.
That would gain a mph or two. I also think an "X" motor would be a few mph faster then an XS Merc.

But I think Wman is looking for "stock" numbers with an engine you can currently buy.

Ya gotta remember..I come from the school of Offshore racing where the hull is directly impacted by waves, rough water, jumping swells, etc. The cleaner the water exits the hull surfaces; the faster the boat. In flat calm conditions very little hull is in the water, however, if you focus on blueprinting the small part of the hull that does contact the water you may pick up some top end speed!!