Mini-jacker ???

[Howard]

Thanks Rich, buying a used motor is a roll of the dice and this one runs so well. This was given to me by my nephew so probally looking at cutting transom.

 

[richg99]

IF you happen to be anywhere close to Waycross GA....Carolina Skiffs are made there. As I said, they cut down transoms all of the time. Perhaps you can get an idea or thought from them. regards, Rich

https://www.carolinaskiff.com/about.html

 

[ditchen]

Another piece of info you need when mounting a jack plate. A rough baseline is for every 1" of set back the motor height should be 1/2" higher. So if you use a set back of 6", ventilation plate should be approx 3" above the keel.

That is usually a good baseline to start. Application and total package combo will vary.

 

[Pappy]

Another piece of info you need when mounting a jack plate. A rough baseline is for every 1" of set back the motor height should be 1/2" higher. So if you use a set back of 6", ventilation plate should be approx 3" above the keel.

That is usually a good baseline to start. Application and total package combo will vary.

Not necessarily! That "standard" started when plates were used mainly on faster deep V hulls (the old Gil brackets) and spread to the Bass market where the engines had specialized propellers and water pick-ups. Way not true on a small flat bottomed aluminum hull that may have an engine with a water pick-up at the rear bottom of the cavitaion plate or a more modern one on the side of the gearcase and well below the cav plate. These boats have no chance of airing out and running bow high like on a built in pad bottom or a 24 degree deadrise offshore hull. All rules do not apply on all boats and engines all the time. Even the 15" designation on a short shaft engine or a standard 20" is all over the place from manufacturer to manufacturer. You may find an inch or more difference between Johnson/Evinrude/Merc/Yamaha/Suziki/Nissan/Tohatsu, etc.

 

[clarkbre]

looks nice clark , would you trust a 30 hp motor on that ?

The one on my boat I would not. However, I would use a 30 if I beefed up the vertical plates. If they were stepped up to1/4" instead of 1/8" the riser would be plenty strong for a 30.

 

[ditchen]

Another piece of info you need when mounting a jack plate. A rough baseline is for every 1" of set back the motor height should be 1/2" higher. So if you use a set back of 6", ventilation plate should be approx 3" above the keel.

That is usually a good baseline to start. Application and total package combo will vary.

Not necessarily! That "standard" started when plates were used mainly on faster deep V hulls (the old Gil brackets) and spread to the Bass market where the engines had specialized propellers and water pick-ups. Way not true on a small flat bottomed aluminum hull that may have an engine with a water pick-up at the rear bottom of the cavitaion plate or a more modern one on the side of the gearcase and well below the cav plate. These boats have no chance of airing out and running bow high like on a built in pad bottom or a 24 degree deadrise offshore hull. All rules do not apply on all boats and engines all the time. Even the 15" designation on a short shaft engine or a standard 20" is all over the place from manufacturer to manufacturer. You may find an inch or more difference between John son/Evinrude/Merc/Yamaha/Suziki/Nissan/Tohatsu, etc.

I used "rough baseline", not a standard. It is a useful guideline and I will agree with ya that "All rules do not apply on all boats and engines all the time". I also understand what hulls/outboard combos most are using here and modified v's and flat bottoms are not the same.

I wanted to point out that the further that outboard is from the transom, the optimal position will be higher then if it was directly attached to the transom without a jack plate.

 

[lckstckn2smknbrls]

The TH Mini jacker is rated to 35 hp.