mcprodesign

well...



It's the 7th.....

1 MAIDEN AMERICA

The short story. 104MPH There's definitely more.
Details later. Been playing all day. Need to spend some "quality" time with my lady. After I post this. lol

mcprodesign

KWright

1 MAIDEN AMERICA

[QUOTE=1 MAIDEN AMERICA;3648762]1st test
200-140?gallons. 3-4 people. Slight chop
5bl 17" 37P 16* rake
102 at 5200
Easy to get on plane
Felt like bow steer

2nd test
150?-80? gallons 2-3 people. Slight chop
5bl 16.8" 36P 20*rake
102 at 5400 on limiter with 1/8 throttle left
Easier yet to get on plane
Handles like a dream!!!!!!!
Maybe, just maybe, slight bow wander.
Coasts for quite a while when chopping throttle. As in, "Oh chit, we gonna have enough room to slow before the no wake zone?". lol Easy adjustment now that I know.

3rd test
Made notches for PU's deeper and ran it. PSI too low. Lowered PU's to 1" below running surface. The notches go above them now. OK, but not great PSI?????? I can tell this pushed the nose down but not as bad as the 16* rake props.
16.8" 36P 20* 80 gallons, 2 people
4K RPM 72MPH 21%
5K 93 18%
5400 102.5 16.6%

4th test
17" 38P 18* 60 gallons, 2 people
4K 75MPH 22%
5K 95 21%
5300 104 18%

5th test
17" 38P 18* 200 gallons, driver only. No, the passenger before did not weigh 1000#'s
4K RPM 73MPH 24%
5K 95 21%
5400 104 20% I was trimmed higher, where trimming higher low on fuel was no MPH gain.

What I've noticed with the PU's sucked up:
Star engine heats up at WOT. It has 1 90* inlet fitting where port doesn't. Needs to go but still want more pressure.
Easy to plane
The boat took zero trim to achieve top speed
Drove great
Threw some roost

With the PU's deep:
Harder to plane
Took more trim to get top speed. 2=0, 4.5 to get speed
No roost
Bow steer, and definitely worse with 18* vs 20*

My water pressures are still low.
I have the Teague adjustables. 2 for inner coolers and 2 for engines. 4 total. Yes, I have a "rake" hanging off the back of the boat, but redundancy is good.

For the IC. I used to have Teague straights (with a 90* to enter the boat), that had an angle cut at the opening creating 1/4" difference from front to rear that created more innercooler pressure than I have now.
Before: 90* PU, -12 to strainer, -12 to IC, one -12 dump. This created 1-3PSI measured at the rear of IC
Now: Adjustable PU, -12 to strainer, -12 to IC, two -10 dumps. This created 1-3PSI measured at inlet of IC

For engines
Before, the water came from the drive to the pump and created 30PSI.
Now, the water comes from the adjustable PU's, through 1" NPT full flow ball valve to strainer (1"NPT's) to pumps(Hardin SS) and with the PU's hanging waaaaay down I get 13PSI on the port engine and 2-3 on the star engine. The star engine has a 90* fitting feeding the strainer that the port doesn't.
With the PU's sucked up the port engine sees 5PSI and the star 0-1PSI, and it gets warm, think. lol

Do you think the IC pressures are fine? Engines still run.
I can get the 90* out of the loop with a differently configured strainer so I will but is 5PSI enough. Again, engines still run.
Anybody ever have a water pressure problem with the Hardin SS pumps?

The teague adjustable PU's hang down 1" from running surface and I've cut 1/2"+ deep notches (now they are higher than the PU's) 15" long in the hull feeding them. How deep can I grind? Do I need to go longer? Anybody have pics of this type of setup on a Fountain? I've seen deeper notches on other boats but how thick is the hull 15" forward of the "notch"?

Here's a ton of questions and data. I hope I can get some more ideas and this helps others.
Thanks
Rob

575cat

I am creating a 18+ lead in to a 1.5 single pickup so the notch a 1.5 deep the glass is thick and went through it into the foam I have to get the glass work finished yet , and from the single pickup to a large 22 inch by 8 inch strainer the fountain boys built as per their recommendation , and then feeding both engines and intercoolers .I hope to god this works , believe Erick has the same unit in his boat .

mcprodesign

I think you have gone through a lot for 1.5 mph and a rooster tail. Can't you just try a set of bravo style props? I know I am beating a dead horse 20% slip ??

TRL505

You are correct sir...Lil R says it will work like a charm. We will see in about 3 weeks.....I hope.

mcprodesign

Hey Rob, When are you going to let me try those 35s ??

1 MAIDEN AMERICA

Didn't know you still wanted to try them. The local guy that wants to try them still hasn't. We took mine out Saturday.
$2700 and I'll ship them to you. His loss.