Tilt / trim

[Zufan4]

I purchased a 1987 Thundercraft Regency 3.0L with OMC Cobra stern drive. It doesn't have a tilt/trim gage. Several of the lakes and rivers in my area have very shallow areas. How can I tell how high is to high to pull up the drive while I'm not at idle? How shallow can I safely go, on plane with the prop fully down?

 

[Mad Props]

You might be able to find an old spec sheet for your boat that will give you draft with prop fully down. However, when on plane, your going to have a smaller draft. But, that would make me super nervous cruising along at 25+mph not knowing if your coming up on a shallow spot... Id rather putt along at max draft, that way if I did hit something, it would cause less damage.. Really, I'd rather just not boat in that area lol.

 

[Zufan4]

Unfortunately haven't been able to find any old spec sheets.