Performance numbers

[Fr. Frank]

Let me know how you like it!

[FishStretcher]

Well, I finally got a chance to test it.

I have a 20' Master Angler with a 100 HP "Yamadog" Yahmaha four stroke. I have a 4 blade 12-3/4 x 19 Amita aluminum prop by Solas.

I have the 2 batteries on the port side of the forward part of the center console. A 20 gallon aluminum tank is up there too. The center hull tank has been pulled and replaced with buoyancy foam.

In addition to the ~376 lb Yamaha F100, I have a 6 HP 25" shaft pull start Tohatsu SailPro with a 6" pitch prop as a kicker.on the starboard stern. It has a 3 gallon tank that sits in the center console.

So balance fore- aft isn't awful, but the weight at the stern is probably 430 lbs with no kicker. And with a starboard helm, that isn't great. But the transducer seems to help, maybe?

With the batteries and tanks forward, the deck drains are above water, perhaps by 1" at rest. With a stock deck.

On the maiden voyage, it pulled 5400-5500 RPM with a 2nd passenger for 28.0 kts before I ran our of river (maybe 200 yards between buoys). With a little under 400 lbs of passengers, perhaps 16 gallons of fuel, and 75 lbs of tools and another 50 of anchors and tackle.

With some practice tweaking the trim it might pull 30 knots if I can run for a few hundred yards. It planed down to 12 knots with improper trim, maybe a bit slower, even.

It has no problem getting and keeping the stern out of the water. I knew it wouldn't be fast, but in the channel chop I was outrunning any boat even close to my size. And the ride is amazing.

My single beef is the stiff feel of the Teleflex SAF-T-STEER no feedback unit. It is brand new.

I suspect I would have a higher top speed with less drag with a conventional foil, but would fall off plane faster with a cavitation late foil. I have the large size hydro-shield. It comes of plane very softly. It is quite nice.

It bogs out of the hole, as I was told to expect, but as bad as an older two stroke, and I rebuilt the carbs myself and haven't timed the throttle sensor or synced the throttle shutters yet. So there is a little more left in it yet to aid in power and holeshot, I think.

Thanks for the tip Fr. Frank!

[Fr. Frank]

Sounds great! And trust me on this, you'll love the small fuel bill. I took my boat out July 4, with 5 adults on board, running at various speeds up 28 mph, but about half was no-wake speed of 5-6 mph. On the water for 9 hours, with about 1.5 hours where the motor was not running, including towing a disabled boat for about 2 miles. GPS says I covered 22.3 miles throughout the day. When I filled up the next day, I just managed to squeeze 3.2 gallons into the tank.

Yes. Absolutely true. I averaged 6.9 mpg through the course of the day. Beats the heck out of the old carb Merc XR4.

That F100 may be just as good on fuel.

[HeadHunter]

I'm about 80% done with a rebuild on a '72 Seafari. (my 4th Seacraft, owned 3-23's over the years) I decided on a new Suzuki 140 for power as it seemed like a logical choice for this application.

Splashed it for the first time this week...propped it with a Suzuki 14 X 20 3 blade SS prop. Acheived 37K at 6200, so it's pretty spot on. Will post some fuel burn numbers as I record them in the future.

I placed the new 50 gallon fuel tank about 2 feet forward and changed the boat to a 25" notched transom, with the motor directly on the transom (no bracket).

The motor looks none too big and the boat sets fine in the water with the 421 Lb motor.

Looking forward to some great times and memories on her.

[seacraftks]

congrats have fun

[McGillicuddy]

Nice choices. Sounds like you've dialed her in. Enjoy the new power. Spot on, Mate.

Could you post some pics of your restoration. Look forward to hearing more on your performance #s.

Cheers.

[Diablo]

HeadHunter,

Congratulations and good luck with the new Seafari! Please post pictures if you have them. Look forward to seeing the speed / RPM / fuel consumption for the DF140. Heard nothing but good on the DF140. Great engine.

[FishStretcher]

I made a mistake I have a 12-3/4 x 17 4 blade, not 19" pitch.

Still tuning, about 29 kts/ 33MPH at 5500-5600 RPM. I haven't synced the carbs yet and I am not sure I get them wide open.

This hull is awesome out in the slop. I accidentally planed it straight out of the mouth of the Merrimac this week. It seemed a little rough going over the standing 4 foot waves at 18 knots! That stupidity would have swamped my other boat.

Other than when I was at WOT heading into a 10-15 kt breeze off the starboard bow, it was a super dry ride.

It would have been perfect if we caught fish and the 11 year old tilt/trim didn't quit (looks like worn brushes). But still better than a day at work.

Well, I finally got a chance to test it.

I have a 20' Master Angler with a 100 HP "Yamadog" Yahmaha four stroke. I have a 4 blade 12-3/4 x **17** Amita aluminum prop by Solas.

I have the 2 batteries on the port side of the forward part of the center console. A 20 gallon aluminum tank is up there too. The center hull tank has been pulled and replaced with buoyancy foam.

In addition to the ~376 lb Yamaha F100, I have a 6 HP 25" shaft pull start Tohatsu SailPro with a 6" pitch prop as a kicker.on the starboard stern. It has a 3 gallon tank that sits in the center console.

So balance fore- aft isn't awful, but the weight at the stern is probably 430 lbs with no kicker. And with a starboard helm, that isn't great. But the transducer seems to help, maybe?

With the batteries and tanks forward, the deck drains are above water, perhaps by 1" at rest. With a stock deck.

On the maiden voyage, it pulled 5400-5500 RPM with a 2nd passenger for 28.0 kts before I ran our of river (maybe 200 yards between buoys). With a little under 400 lbs of passengers, perhaps 16 gallons of fuel, and 75 lbs of tools and another 50 of anchors and tackle.

With some practice tweaking the trim it might pull 30 knots if I can run for a few hundred yards. It planed down to 12 knots with improper trim, maybe a bit slower, even.

It has no problem getting and keeping the stern out of the water. I knew it wouldn't be fast, but in the channel chop I was outrunning any boat even close to my size. And the ride is amazing.

My single beef is the stiff feel of the Teleflex SAF-T-STEER no feedback unit. It is brand new.

I suspect I would have a higher top speed with less drag with a conventional foil, but would fall off plane faster with a cavitation late foil. I have the large size hydro-shield. It comes of plane very softly. It is quite nice.

It bogs out of the hole, as I was told to expect, but as bad as an older two stroke, and I rebuilt the carbs myself and haven't timed the throttle sensor or synced the throttle shutters yet. So there is a little more left in it yet to aid in power and holeshot, I think.

Thanks for the tip Fr. Frank!

[FishStretcher]

An update: with this setup including some trolling and a run down Plum Island at WOT and back north at cruise, I did about 26-28 miles on 6-7 gallons of fuel, by the gauge. At WOT with the size large Hydroshield and a stern lift prop, I feel like I almost have too much lift at WOT, but just right at cruise which is about 20-22 knots/ 23-25 MPH.

[Fr. Frank]

Sounds very good. You're describing between 4-5 mpg, at a very comfortable cruise. Here's a hint on limiting the effect of sternlift at WOT: Run the motor trimmed out/up as far as you can without losing thrust or ventilating.