2001 21 seacraft with a 300 verado?
 

Anyone done this? Problems? Performance numbers?

Nobody in their right mind...:rolleyes:

NS Sherlock!!! :)

Don't pay attention to those guys....you should do this ;)

Why mess around with a lousy, slow, heavy 300 Verado, just get the 400R and be done with it. :)

Twin 7 627`s and be done with this.

I know of an old 23 that was cut down to a 21 and runs only 50 with a 300 yamahoo.

Mike is sandbagging at 50 mph.... 50 knots more like it.

The transom is only 25" and you want to put 700lbs on the back? there are better power options for the 21. See what comes out tomorrow from Merc ;) at the miami show.

Do-it !
I double dog dare you...

Attachment 16611

If you fish around on this site you'll find plenty of standard info for 20's, not too much for 21's. So if we are talking 20's, mine is unmodified 74 with a 94 Evinrude 150, 25" shaft on a 5" static jack plate to compensate for the long shaft short transom match. I max out right at 45 MPH (trimmed up, half tank, calm day one or 2 people) That boat is moving very nicely then, but with a reasonable repower and an up tick or 3 in HP I could see getting 55mph out of it and thats probably all I am are going to be comfortable with on that hull. I happend to do some reading this week on the same topic on this site and guys were stating that with a 250 on it it would start to chine walk in the low 60's so he couldn't drop the hammer all the way. There is another gentleman that has (had) a 225 on his and runs well. Plus there are 2 youtube videos of a 20's with 225's getting after it, one inshore and the other offshore. There are several 200's but haven't heard or seen much of the numbers from them but most of what you'll find are 20's with 150's. Even that might still be a notch above what you need to run on this boat. But if you are talking about a 300, you aren't talking about "need", you are talking about speed. That being said. I was in Islamorada (middle Florida keys) this summer with my friends 21 Paramount with a 225 on it and this boat "gets it" and low and behold a 20 Seacraft comes ripping by with a 300 on a bracket. I initially was thinking "it must be a 23" But when I caught up to it idling by Robbies, it was clearly a 20. Sat in the water a little low but not as bad as you might think. It had the aura of a square grouper rig about it but the 20 is not quite practical when it comes to deck space for hay bales. Never the less, someone has done it wiht a 300 and I was using all makers on my pile in the Paramount and the Secraft was still making time on me. For my own eventual re-power I currently like the idea of the E-Tec (G1) 200HO but haven't found ant stats on it, or the Yammi F200 4 cylinder, afraid the latter doesn't have the kick I want. I know when I say 55, I really mean 60 so now we are talking 225?.. : ) But look around on the site an use the search engine and you''l find lots of great tidbits from the brain-trust on this site to include different engine stats and prop selection. You just have to do some digging but you learn a lot along the way.

I have hit mid 60's with a carbed 1999 200HP Mercury on my 1970 SF !!!
Enough said.....

Have proof and fellow members on my boat to verify....

300 HP is just plain stupid on a 20 or 21 !!

2001 21’ is basically a shorter 23’ much wider and deeper than the 20’ Hull. While the 300 is overkill I think it would work I had a 78 20’ sf with a 225 rude on back that get 64 mph going across the bay side of islamorada more than a few times if I had the boat again a 140 or 150 would have been a better choice. Would think a 225 would be a great fit on this project but everyone has their own plan and needs

The issue is the weight and the 25" transom height, but HP is entirely unnecessary for the 21 too. 300 promax and 300x weigh 467lbs that's 233+lbs lighter than the verado. There are better hull choices if you are chasing speed. If you want 50+ on the 21 seacraft get a g2 rude 300 which is 537lbs. I still think you'll have wet feet and waves breaking over the transom on the drift . . . if blowing by another boat gets your rocks off, go for it.

So general consensus is too much weight and too much power. If transom was enclosed and it was bracketed with a flotation pod would this be more feasible? Comparing a 20 to a 21 is apples to oranges. The 21 is deeper and heavier and wants more power.

Well let's see, a bracket would move the CG about a foot to the rear with the Verado, the flotation pod might make up 5% of that, however bottom line the bow's gonna stick way up in the air. I'm assuming you have a deal on a 300 verado?

To be fair nobones aint got a "normal" merc 2.5L 200hp :)
You can modify these 2.5L Mercs to put out CRAZY hp and you keep the weight under 400lbs.

https://www.youtube.com/watch?v=AO_ydhaE6HE

https://www.youtube.com/watch?v=F7x_e5m0R2Y

This is a 30" shaft vrod. 707lbs
https://www.thehulltruth.com/attachm...3&d=1518820144

posted with op on fb about this,,,he wants a 50 mph boat.??? I am no motor expert, I have a 21 year 1998 the same hull ...I also had a 20 Potter for 30 years...The 21 is a 23 cut short, its a heavy boat since mine is rigged with t top and top mounted outriggers holds 95 gals fuel....So with a 2015 Optimax 200 and a cheep stock alum 17in prop I top out at 42 mph at 5300 rpm...note boat is rated for a 225....i can most likly change my prop and take down my outriggers and take a few things out of the boat and may be I could gain another 4 mph....So may be a 225 or 250 he can get closer to the 50mph he wants ???? PS I think my Optimax is 525 lbs and with a battery in the back and 2 big ass guys in the back I get NO water in at All...so may be he does not need a 300,,JMO

Joe R
21 SeaCraft
1998 / 200 Optimax
Susie 2

Joe didn't you replace your 95 gallon tank with a 55gallon poly tank recently?

40gallons x 6.3lbs = 250lbs (250lbs = 1 big guy).

Yes I did...but I never had the 95 filled ...the numbers were with 2 guys and about 45gals. fully rigged ,
I think I could do better than 5300 motor says 5300 to 5500....I have a stock 17in alum prop. looking to go with stainless , maybe a dif pitch ???? like I said not a motor expert by no means...I don't run her hard , mostly 4200 -4400 about 32mph....A little tab and she gets right on top and cuts seas nice except larger long period swells...will try dif props this summer..sorry for the derail OP

Joe R.
21 SeaCraft
Susie 2

Could be.

238 at the prop?

I have an 05 21 now, currently under rehab...enclosed transom and floatation bracket. I chose Yam 200 inline 4 as i'm going for overall performance not speed...imho with that 300 bracket or not its going to be a porpoise machine and a hard slapping ride in rough water