Hey Kenny

[Texasmark]

Got this POS Hustler 23" alum sitting on the shelf. Boy-son is running a 21" Turbo II on a Pro craft 18' with a Merc 150.

If you haven't seen a Pro, they are deep v front smoothing back to a padded arse with lifting strakes to the side (with hull steps) and the typical BB setback step in the bottom B4 the transom...no jackplate.

Ran day B4 yesterday at 6 grand even and 55 mph after picking up 2 mph courtesy of decarb kicking in. Just utterly amazing how that stuff works.

Ran the numbers and it said we were at 8% slip (gearbox is 2:1). Pretty tight I'd say, but believeable. Most of the spray was at the gunwale/transom corners with a slight amount forward of that. Didn't have much wetted hull. Trimmed out till mph fell off then took the measurement.

Ran the numbers on this 23" Hustler and if it runs hard like it did on my 90 then he may only pick up 1 mph or loose like I did.

Got any comments you feel like talking about? Thought I'd stick it on just for the heck of it.

And.............no clutch dog rattle on the 6 cyl. 8)

Thanks,

Mark

 

[walleyehed]

Re: Hey Kenny

I've got a customer with a Procraft 18ft'r with a Merc 150 as well..It's the Large gearcase though..you must have an XR6 if the same prop from your 90 will work on the 150. We run a 21P laser on it (his choice) about 5800 R's at 3500ft elevation.
I "think" you'll see about the same speed, possibly a bit less, but the TurboII was designed for a different purpose than the Turbo1.
Be interesting to see how the hustler hooks up on that rig.

 

[Texasmark]

Re: Hey Kenny

I figured you'd catch it and you did.

His is the standard 2 liter 150 with the large (4 3/4" ?) gearbox. I know Merc upped the cubes on their 150's for a better hole shot on BB etc, but the current setup on this rig punches out in a couple of seconds.

Funny, even though the Turbo II is ported (boy is it) I can't feel the ports close like I could on the last boat I had with a ported Merc SS prop (don't remember the name of it.....was a 1989 design for a I6). But they must be working cause, like I said, the hole is only a couple of seconds.

The Hustler I bought (for my 90 hp) was the large diameter for the higher hp engines. It was the only one I could get with a pitch over 21".

The 14 1/4 blade diameter just fit my engine (clearance to the av plate) but the diameter of the prop's hub was the same as the diameter of my gearbox.

So I made a spacer to set the hub right behind the gearbox, not slightly in it as is normally the case, so that I could run it on the 90 hp.

Think we'll run it just for the data. Others, besides yourself, confused/curious about alum vs SS for their rigs may profit by the information. Really, the only bummeer I can see with it is blade thickness, beins they added all the other high perf goodies to their design. If they could figure out how to get thin blades on alum props they probably would run a lot better..................but the props would be in the shop all the time d .

But where I do most of my running is a clean lake; no stumps, no rocks, depth finder keeps you off the bottom and it's small enough that you don't have any large waves so an alum would be perfect.......................and for my 3 cyl, no clutch dog rattle!!!!

Probably be a couple of weeks before we get the data.

One last question, if you will. You said the Turbo II was designed for a different purpose than the Turbo I. Mind sharing that with us? Thanks,

Later,

Mark

 

[Texasmark]

Re: Hey Kenny

You may have already answered the Turbo I, II question in the "Turbo Props" thread.

You mentioned "stern lift" for a couple hundred more rpm's. I guess what that means is an attempt to reduce the wetted area of the boat hence reducing the drag and hp required to fight it.

So you gotta have bow lift and now stern lift, I guess in short the prop just runs cleaner and the slip factor is reduced.......course I'd think that would load the engine more and reduce rpm's. :% Guess the reduction in wetted area is more prevelant in determining rpm's at this point.

Mark

 

[walleyehed]

Re: Hey Kenny

To my understanding, all they did to the TurboII was reduce the efficiency slightly...higher RPM, same speed.
As Precision relayed to me; TurboII is for those that wanted (needed) a bit more RPM without loosing any speed.

 

[Texasmark]

Re: Hey Kenny

Thanks

 

[Texasmark]

Re: Hey Kenny

Finally got a pic of the 24P Ballistic in action as my Avatar. Now gotta figure how to get it to copy in a thread.

Mark