98 Cobra setup

[mastodon1977]

98Cobra 201,98 Johnson 225 Venom, 10' JACKPLATE. I Need motor height, prop and should i go 3 blade or 4 blade? Thanks for any help you guys can give me.

[pmgoffjr]

25 Tempest with a bomb hub. Start at 3 3/4" and see how it runs.

[mastodon1977]

Thank u Mr Goff.

[mastodon1977]

Mr Goff what exactly is a bomb hub?

[mdtritn21]

Mercury hub kit for Evinrude or Johnson motor.

[mastodon1977]

Thank you, Sir.

[mastodon1977]

How would a 23p 4 blade ballistic fare on this setup. Iwill be ordering a tempest plus 25p anyways.

[pmgoffjr]

Not much hope.
That hull wants all the bow lift it can get. That four blade won't give it.

[mastodon1977]

Great, thank you.

[mastodon1977]

Mr Goff, i finally got a Tempest 25p. But im blowing out on launch. It has one plug missing. With the motor at 3.5 below pad.

[mastodon1977]

Mr Goff, i finally got a Tempest 25p. But im blowing out on launch. It has one plug missing. With the motor at 3.5 below pad.

[pmgoffjr]

Mr Goff, i finally got a Tempest 25p. But im blowing out on launch. It has one plug missing. With the motor at 3.5 below pad.

Review your setup.
Nothing like a transducer blocking water flow?
Do you have another plug? Duct tape works to test.
Known good prop? Little bit of tip cup makes a difference.

Or start dropping 1/4" at a time to find some bite. Johnrudes can't run as high as a merc.

[mastodon1977]

Hey Mr Goff, i installed some small plugs, now it will take off, but it takes forever for the RPM's to build up and the boat wheelies for a long time before its on plane.

[grout-scout]

Do you have the plugs with the small holes in them or are they solid? What exactly do you have?

[mastodon1977]

S, for small. It had 2 large and one plug missing.

[mdtritn21]

If it bogging on take off which it sound like your doing it needs more venting on the blades. If you still have the large plugs that came with the prop put one of those back in it and try it again. Your trying to get between 3500 and 4000 rpm's at take off. They don't all have to be the same size either.

[grout-scout]

S, for small. It had 2 large and one plug missing.

Ok, so what was in the prop now? All 3 small or 2 large and a small? These guys need more exact details.

[mastodon1977]

all 3 small right now. initially it had 2 large and one missing(open).

[mastodon1977]

If it bogging on take off which it sound like your doing it needs more venting on the blades. If you still have the large plugs that came with the prop put one of those back in it and try it again. Your trying to get between 3500 and 4000 rpm's at take off. They don't all have to be the same size either.

You're 100% correct. Im going to try one large plug in combo w/ 2 small. Thank you....

[grout-scout]

You're prob gonna need the 2 large and 1 small, but you never know.