Adding jack plate on a 21 cat hull

**Jkissel20** · 01-15-2019, 08:17 AM

I'm running a 300 e-tec gen1 with 12" setback on an Advantage Banshee / Eliminator Scorpion hull. Just changed the gear case to a sport master 1.62 gears. When approaching 80 the boat starts to 'roll' and wants to touch each corner due to the drive height I believe; the nose cone is 1" below the pad. I want to move it closer to the general-purpose recommendation of 1 1/2 inch above the pad, but do not have a jack plate. In this case I was running a 26" Bravo 1 prop, and now have a 28" Signature cleaver to try.

Quick note before my questions; transom was rebuilt with a set of large and a set of small knees. Seems very solid.

Here is my question; what do I do with the 12" fixed setback. Thinking that some of my viable options are:
1. Can I add a 2.5" jack plate to the fixed setback. Would then have 14.5" of setback. In this case I'm worried about having that much torque on the transom.
2. Do I get rid of the setback and go with a larger jack plate? possibly in the range of 10"
3. Get a 6" fixed setback and add a 4-6" jack plate?

Thanks in advance for the conversation on this topic. Picture is of the old gear case... do not have a picture of the new one at the moment.

**vnemous** · 01-15-2019, 08:24 AM

You could probably find a used Rapid Jack in 12" pretty reasonable. I believe HStream1 maybe auctioning one off. PM Him

**Jkissel20** · 01-15-2019, 09:42 AM

Thanks for the quick reply on this, and I'll look for it. It seems easier just to add 2.5" jackplate without having to fill transom holes and re-drill for a new jack plate. However, I've then gone to a longer setback with the pressure on the transom. Not sure it could handle that extra pressure. Any experience with > 12" setback and anything to worry about there?