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Posting a reply to: Re: Speed / prop help

Muskie Fishing -> Muskie Boats and Motors

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anzomcik

Posted 5/2/2018 12:04 PM (#905636 - in reply to #905492)
Subject: Re: Speed / prop help

Posts: 529

Somthing isnt right, it may be your tach or speedo

5600 rpm / 2.07 gear ratio = 2705 prop shaft rpm

2705 prop shaft rpm * 19" pitch of prop = 51395 inch per minute.

51395/12= 4283 feet per minute.

4283 x 60 (minutes in one hour) / 5280 (feet in a mile)= 48.7 mph theoretical top speed.

48.7 x .85 (average prop slip) = about 42mph top speed.

average slip is 15% your getting like 40%. very poor for your set up.