Need help finding right size outboard

I have a 1971 galaxy that I'm restoring and need a outboard motor. The problem I have it I don't know what size I really need. The boat is 19ft and a I'm in need of motor and controls ( unless I can find something that will work some Johnston control I have from the early 90's. I can't find the plaque on the hull saying hp rating and don't want to over/under power it.

Re: Need help finding right size outboard

I found some formulas for calculating HP capacity on-line. Based on water-line length and width of transom. Didn't seem valid for my flat bottomed tinny (showed either significantly under or over the mfg. rated HP - I can't recall which). However, there are probably guys on here that can give you better info just by eyeballing your photos

Re: Need help finding right size outboard

From the Coast Guard: http://www.gpo.gov/fdsys/pkg/CFR-2004-title33-vol2/pdf/CFR-2004-title33-vol2-sec183-53.pdf

This is only a general guide ....

Step One - Compute your Factor


A. Length of Boat x Transom Width (measure in feet: 14, 15.5,16, etc).


Step Two - Compare your factor to H.P. rating


A. 0-35 = 3 hp
B. 36-39 = 5 hp
C. 40-42 = 7.5 hp
D. 43-45 = 10 hp
E. 46-52 = 15 hp


Step Three - If your factor is over 52 (Choose only A or B)


A. With Remote Steering (steering wheel) and at least 20" transom height


Maximum HP = (Your factor x 2) - 90


Example: 19' 6" long , 7 feet wide = (19.5 x 7 x 2) - 90 = 183 (Round up in multiples of 5. This boat's max is 185 hp).


B. With Tiller Steering (hand or extension) or less than 20" transom height (Choose only 1 or 2)


1. Flat bottom, or hard chined boats (hull has hard angles)


Max HP = (Your factor x 0.5) - 15


2. Soft chine, rounded hulls


Max HP = (Your factor x 0.8) - 25