Originally Posted by Rage (Post 2616112)

What was the slip with the "labbed 24 B1 (done by a certain havasu shop)." at what speed/rpm?

Originally Posted by Steve Zuckerman (Post 2615147)

The "X dimension" is the vertical (not measured along the transom angle) distance between the driveshaft, and the bottom of the boat.
I use a flat or square yardstick taped to or held against the pad. Then, you can measure off the top of the yardstick with a framing square, to the tilt pins on the side of the gimble bracket. The tilt pins are located at the same height as the drive shaft.
It does help to level the yardstick, and check the framing square for vertical alignment.
Since I know mine is 19.25" measured this way, I thought you might want to measure yours "the easy way" along the transom from the bracket to the top of the notch. If your's measures 6 3/4"s, you're at the same height. Above (unlikely)or below that, would give you something else. Either way, you would have a known height to work from.
For instance, 19.25" is generally too high, and a 1" spacer usually results in much better slip %s with a 4 blade. If your "bracket to notch" measurement is more like 6"s to 5 3/4"s, you are lower by 3/4" to 1" and closer to what we have generally found to be a better performing XD on a Heat.
What Imco is asking you for is propshaft depth. Another practical way to determine gearcase and propeller depth. That is partly how they determine whether or not a nosecone, standard length Imco case, shorty, or spacer would help a specific boat.
What did they say?
Good luck and keep us posted with your progress.
Steve

Originally Posted by Southocg (Post 2616361)

Steve,

Do you have the dimension from the bottom of your keel to the center of your prop shaft?

Thanx,

Originally Posted by Southocg (Post 2616359)

RPM's ran up to around 61, slip around 20 speed at 80.

Originally Posted by Rage (Post 2616989)

What slip are you getting with the other props that you have tried?

Originally Posted by Steve Zuckerman (Post 2616957)

19.25"s, measured vertcally.
Steve

Originally Posted by Southocg (Post 2617526)

I was talking prop shaft. Should be in the 4-5" range.
From the bottom of the keel measuring down.

I'm out of town right now, when I get home late friday, i'll measure mine the other way.

Originally Posted by Steve Zuckerman (Post 2617589)

Sorry,
I see you said prop shaft, not driveshaft. I am out of town too.
Will measure that when I get back.
Steve

Originally Posted by Southocg (Post 2616359)

RPM's ran up to around 61, slip around 20 speed at 80.

Originally Posted by Rage (Post 2618974)

Does this particular Havasu Prop Shop happen to be located next door to the Nordic factory?