Hydralic jack plate plus manual?

[mendo]

I have a 6" manual jack plate on my Allison GT-20 and want to add a hydralic one that is 6". Should I use only the hydralic or both? If both, which one goes on the transom?

[outboards4life]

Do you really need that much setback for that boat? Yeah you can use both plates but it seems like a bit of setback overkill for an Allison. I would use the hydraulic 6 inch only. Unless your really watching the weight of the boat. If you do end up using both plates I would put the hydraulic on the engine and the manual on the boat. the less the plate has to lift the better.
Travis

[Reese]

hell most of these jackplates are barely strong enough with just the engine hanging on the back...adding a second jackplate isn't gonna help.

If it were my boat and I had no other option, I would bolt the manual directly to the transom and if possible use locktight on any sidebolts to lock the unit in place. I would put the hydraulic unit on the engine side...you'll have a much more rigid arrangement this way.

The reason why I don't like two adjustables stacked on top of each other is that you're doubling the amount of sideplay and rigidness you get from a stationary bracket/adjustable combination.

[Techno]

Aren't there hydralulic units that supply more than 6" of setback?
Get one of those and leave the manual off. Or a set back bracket.

[mendo]

OK, sounds like I will start with the hyd only, then if I want more setback I will use the manual on the boat and the hyd on the motor. I thought I saw a pic somewhere on here that had a setup like that. I hear about 14"+ setback and was thinking that is where I was trying to get to.

Any additional thoughts or theories welcome!!

Thanks!