37 X_Dimension
 

Finally got the measurements.....

From the inside of the transom assy. 10 inchs too the bottom of the boat.

looks a little crooked, could you measure it again??? :eek: :drink:

Clark Please chime in here :D

Thanks for the info. I will take a look at mine next time. YOu have a one inch spacer correct? If so, you are really 9 inches from the bottom.

It is not crooked smart A S S!!!!

Yes, I have a 1 inch spacer in the drive. It does not matter about that where I measured. I measured off the TRANSOM ASSY. (on the inside of the drives) down too the bottom of the boat. So if you go from there it does not matter if ytou have a spacer.

The spacer only plays in when you start having to correct for the X-dem.

That is what I mean. I my is 10 inches also my drive is 1 inch higher than his due to the spacer. His is one inch deeper inthe water... Trying to compare apple to apples here.

Your prop is higher..not the drive.
If I understand this the top of ya'lls drives are at the same place below the rubrail.
The spacer puts his prop lower...to correct for that "nose bleed" drive height.

Yes you are so right, if your drive is 10 inch's also then try a 1 inch spacer and you should pick up like I did. I went fron 24% slip to 14% slip by getting the prop in cleaner water. Hole shot is ALOT better and cruise also.

Do you have to trim as far? What prop were you running prior to the spacer? Thanks for the info...

My drives are mounted above the rub rail, and below the engine hatch. Think I need a spacer Clark?? :D :D

I believe to get the actual X dimension, you add 9.25 inches from the measurement below the transom assembly to the bottom.
I know on a single, you measure to the bottom of the V. Not sure if that how you should measure it is well for twins.

No you just need to put some of those fancy lights under your driveslike the ones under your seats!!!:drink:

Trim is the same. I have two sets of props 30 & 32. I use the 30's for topend get a little more out of them, 90mph and the 32's for long distance cruising, get about 5 mph at the same rpm, top end loses a little 87.5 . Cruise at 3000rpm at about 45-46 mph. Fuel mileage 1.5 mpg:drink:

I did try Rich's 1 1/2 inch spacer's, they were great out of the hole shot NO SLIP but lost some cruise and top end. Went back to the 1 inch. I think they work the best.

Drive height/X-dimension
 

Bobby Moore instructed me on drive height/x-dimension...His suggestion was to use a long straight edge on the hull, say a 4' or 6' level and hold it up on the hull; run it straight past the lower unit with the drive in a level or neutral position...measure from that line down to the center of the propshaft. This dimension should be between 4" & 6" for a 75-90 mph deep "v". Step hull could change this number slightly. Just what I was told; maybe this will be helpful....of course the best lessons are the one's learned thru trial & error! LOL

Same way I was told to do.I think mine was 6" from the bottom of pad to center of prop shaft.

I'd be willing to bet that Pat is reading all this and saying Hmmm?????

I bet your right!!!

Well my boat had 1-1/2" spacers when I got it. When I spoke to previous owner and told him I planned to take the spacers out he said"don't even try it" boat was blowing out and once on plane would porpoise out of control. Could be cause it's a twin 28...so I left them in after talking to Bobby Moore...x-dim. is 5.5" right now.

:eek: What should Pat care? He sets up the boat for what he considers to be the best all around set up for his product. Most manufactures do. That doesn’t mean that you can’t play with it yourself and realize some value. Look at James, he got 3mph with a 1 inch spacer and Thunder Roy's boat ran 90mph with 500EFI's after he was done messing with props, boxes, and drive height. I was in his boat the day it was delivered and it ran 86. It’s what the owner wants. No two boats are the same. Rich said that the best all around prop on his boat was stock 32 bravos. On my boat the lab 32's ran 4-5mph faster than the stock 32's and got on plane faster and smoother.

You are surely kidding, correct?

Hey Cosmic did anybody take your bet ? :D

Geez, I didn't meen to start anything I was just making an observation. I know you want to play most anyone does. Have fun with it. After all it is your boat. Please don't take offence:cool:

I know you care. I just busting your chops. You have been extemely helpfull to me. "Put a set of lab 32's on"!!!

FYI: James also had put in motors with roughly 150 more HP per side than what the boat was built with......drive height needs could have changed with that alone.

That is not X dimension. That is propshaft depth which is what really matters. Your X dimension does not change when you add a spacer, but your propshaft depth does.

X dimension is based on the crankshaft centerline measurement from the bottom of the boat.

Well put...you are correct,; I'm glad you said it like you did. I should have said propshaft depth is 5-1/2". However, had the motors been mounted a bit lower, with a shorter x-dimension, the spacers would not be needed. That's what I meant to say.

Yeah, but its lot less expensive to add a spacer and go deeper than it is to buy a shorty lower.

Now why in the world would you do that when you hadn't exhausted your prop sources from around the globe?

I have to admit, however, that the last set you sent us were so SWEEEEEET. Especially after we get her up on plane.

Next time we try those props, though, Jay has to sit up on the bow to get her on plane......

What ya talkin about. 1-Mississippi, 2-Mississippi, 3-Mississippi, 16-Mississippi, Gee honey we are getting on plane, see I told ya this 5" spacer was better:eek: :D:drink:

Can you feel the luv here ? :eek: :rolleyes: :D

I feel I should clarify that my situation was probably caused by the addition of the "keel plane" and the motors were mounted correctly from the factory. The previous owner's claims and my current performance are all I have to go by until I start "playing" around with the set-up. Which I don't plan to do right away. I was prepared to remove the spacers, but was advised against once I measured my propshaft depth. I am never satisfied, but that's most people....I'll just get a faster boat rather than try to push the limts in unknown territory. I've been told the 28AT hull is stable & predictable to 80mph....after that it's aguess.
And yes, Griff, spacers are much cheaper than shorty's!

Pat, Was this the first 28 built in 1999? I've heard there are "old" hulls & "newer" ones. What's the history of the original 28's & "newer" designs?
We love this boat more each season!

Very simple, because you do it to me!!!:D

Next time we try those props I rather add weight in the front the old fashion way. Jay's time is too expensive for being on the bow. He should focus on being the next ace fork lift guy in the company.:evilb:

JJ,

you've got this all wrong......

It was more like 1-imthepropmaster, 2-imthepropmaster, 3-imthepropmaster, 20-thesethingsarejunk, 30-wheresmylabbedbravos.....

:D

Lmao :drink:

Its not like you had anything else to do! Right Jeff? :rolleyes:

Good one Pat!!!!!:D

I was actually talking about Radio Active. How with out spacers in and wrong set of props the boat was hard to get on plane. It also didnt help the KE 675's never ran right till Eddie half azzed fixed them. I dailed the boat to my boating specifics. 1 1/2" spacer and Hering props. It's all trial and error, fraustrating at times. Go to lake X for the day, that might work for you. Jeff