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Author Topic:   30 hp 13' sport speed question

flyfisher1771 posted 03-22-2005 06:51 PM ET (US)
How fast should a properly propped 30hp push a 1968 13' sport? I have a 1997 30hp Merc with electric start and remote steering. I am running the factory prop and I was pushing 21 knots solo today with very light fuel. I just installed a transom mount transducer with speedo so that is where I am getting my stats. Is this typical? She planes out nicely at about 10 knots and runs fine. I am just curious.
Thanks,
Hugh
FISHNFF posted 03-23-2005 02:48 AM ET (US)
I would think closer to 30.
I had a 1981 13 with a 1981 35 Evinrude (later rated 30hp) and did around 30 w/o PT&T.
Later repowered with a 1989 Yamaha 40 and did almost 40.
Rebuilt the 40 to a 50 and broke 40.
Check your RPM's to be sure you are in the right range. Also get a GPS and accurately check the speed. Those paddlewheels can be pretty far off.
The 1968 I have now with a Nissan 18 4-stroke feels around 20 or a tad more. It's apart now, but coming together soon.

FISHNFF
jimh posted 03-23-2005 07:12 AM ET (US)
I would be quite surprised to learn that a 13-foot Boston Whaler hull can maintain plane at 10-Kn (11.4 MPH).
2manyboats posted 03-23-2005 08:01 AM ET (US)
Our 1973 13 sport with 25 yamaha slow plane 12 to 15 kts, wot 23kts
The 13 with a 40hp wot 34kts
bsmotril posted 03-23-2005 10:34 AM ET (US)
My old Johnson 30Hp would push my 14' skiff similar to a 13 Whaler to 31mph on a good day. 28 was more typical.
BillS
an86carrera posted 03-23-2005 01:02 PM ET (US)
'67 with '74 50 Evinrude no trim just tilt 2nd from top trim hole 38mph top trim hole 42mph on GPS...very hairy to handle. Would love to remove the trim tab type feature at the rear of hull and those skegs but don't want to ruin a beautiful 40 yr old very original 13 sport
lloyd13 posted 03-23-2005 02:09 PM ET (US)
I would expect 27 or 28.
mdono posted 03-23-2005 04:10 PM ET (US)
'73 13' 40 hp 4 cyl merc. elect. start t/t 12 gal. fuel 200 lb. person
30.46kts or about 35mph.
Thought it would be faster.
'77 13' 25 hp johnson pull start no power trim remote steer
same load plus 58 lb german shorthaired pointer
23kts or 26.7mph.
Faster than I thought it would be.
Slows considerably with greater load.
flyfisher1771 posted 03-23-2005 06:18 PM ET (US)
Thanks for all the feedback.
Jimh- I am basing my speed on the paddlewheel transducer so it may be faster than that.
I will repost when I check it against a GPS.
Thanks again,
Hugh

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Author	Topic: 30 hp 13' sport speed question
flyfisher1771	posted 03-22-2005 06:51 PM ET (US) How fast should a properly propped 30hp push a 1968 13' sport? I have a 1997 30hp Merc with electric start and remote steering. I am running the factory prop and I was pushing 21 knots solo today with very light fuel. I just installed a transom mount transducer with speedo so that is where I am getting my stats. Is this typical? She planes out nicely at about 10 knots and runs fine. I am just curious. Thanks, Hugh
FISHNFF	posted 03-23-2005 02:48 AM ET (US) I would think closer to 30. I had a 1981 13 with a 1981 35 Evinrude (later rated 30hp) and did around 30 w/o PT&T. Later repowered with a 1989 Yamaha 40 and did almost 40. Rebuilt the 40 to a 50 and broke 40. Check your RPM's to be sure you are in the right range. Also get a GPS and accurately check the speed. Those paddlewheels can be pretty far off. The 1968 I have now with a Nissan 18 4-stroke feels around 20 or a tad more. It's apart now, but coming together soon. FISHNFF
jimh	posted 03-23-2005 07:12 AM ET (US) I would be quite surprised to learn that a 13-foot Boston Whaler hull can maintain plane at 10-Kn (11.4 MPH).
2manyboats	posted 03-23-2005 08:01 AM ET (US) Our 1973 13 sport with 25 yamaha slow plane 12 to 15 kts, wot 23kts The 13 with a 40hp wot 34kts
bsmotril	posted 03-23-2005 10:34 AM ET (US) My old Johnson 30Hp would push my 14' skiff similar to a 13 Whaler to 31mph on a good day. 28 was more typical. BillS
an86carrera	posted 03-23-2005 01:02 PM ET (US) '67 with '74 50 Evinrude no trim just tilt 2nd from top trim hole 38mph top trim hole 42mph on GPS...very hairy to handle. Would love to remove the trim tab type feature at the rear of hull and those skegs but don't want to ruin a beautiful 40 yr old very original 13 sport
lloyd13	posted 03-23-2005 02:09 PM ET (US) I would expect 27 or 28.
mdono	posted 03-23-2005 04:10 PM ET (US) '73 13' 40 hp 4 cyl merc. elect. start t/t 12 gal. fuel 200 lb. person 30.46kts or about 35mph. Thought it would be faster. '77 13' 25 hp johnson pull start no power trim remote steer same load plus 58 lb german shorthaired pointer 23kts or 26.7mph. Faster than I thought it would be. Slows considerably with greater load.
flyfisher1771	posted 03-23-2005 06:18 PM ET (US) Thanks for all the feedback. Jimh- I am basing my speed on the paddlewheel transducer so it may be faster than that. I will repost when I check it against a GPS. Thanks again, Hugh