Whats the top end of your Mac when motoring?

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KRV
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Location: Everett, WA

Post by KRV »

Tom Spohn wrote:Moved the boat today. '04M with 70 HP Suzuki. Two adults, one dog, medium gear, no ballast, topped out at 20.3 mph at 5150 rpm.

KRV What is your max rpm for 20mph and cruise at 17mph?
Are you talking knots or MPH? I cruise at 17-18 knots (20 MPH) just under full throttle and max out at 20 (24 MPH) (right conditions). I highly doubt I will get to 20 after my bottom paint is finished :)
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flbum
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Location: Venice, FL "Carribean Amphibian" 2005M Yamaha T50

Post by flbum »

I'm at 15-16 mph in calm seas with full ballast and two adults on board. I have a 2005 26M with a Yamaha T50 (50 HP high thrust) 4 stroke engine driving a 14x11 prop.

I have yet to go out without full ballast. The admiral won't permit it and I haven't been out solo yet.

Regards,
ROB
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Scott
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Post by Scott »

Image

About 140 on pump gas
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DLT
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Location: Kansas City 2005M 40hp ETEC

Post by DLT »

Hey Scott,

I think you may have a problem... In that picture, it doesn't look like your rudders are up... So, I bet they snapped off long before you hit 140...

But cudos to you for being able to control that squirrly beast with the rudders down!!! (That's usually how I remember to pull them up, the boat starts getting squirrly... ;)

I also hope you left the mast on the beach, 'cause it aint there either... I wonder if it could handle motoring at 140? (See other thread...) Have you tested that? ;)
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Catigale
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Post by Catigale »

I did 23 mph with four on board unballasted when I got the boat.

Now we are down to 19 or so with all the stuff we have loaded up.

MERC 50 HP BF EFI

2002 :macx:

IT makes a big difference if your motor is up or down...
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Mark Prouty
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Location: Madison, WI Former MacGregor 26X Owner

Post by Mark Prouty »

Scott wrote:Image

About 140 on pump gas
DLT wrote:Hey Scott,

I think you may have a problem... In that picture, it doesn't look like your rudders are up... So, I bet they snapped off long before you hit 140...

I also hope you left the mast on the beach, 'cause it aint there either...
Image

Why that puppy will clean everything off the decks too! Come to think of it, where is Scott?
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KRV
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Post by KRV »

Ok, Bottom paint is done. I have to change my engine performance on this thread. My Mac is now cruising at 15.4 knots on average with a top speed (right conditions) of 19. I lost between 1.5 and 2 knots of speed with the barrier and bottom paint.
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