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1988 Wellcraft Nova 3 performance notes/questions:

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Old 07-12-2007, 12:24 AM
  #11
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My Boats: 1988 Wellcraft Nova 3 - 28ft
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BobKatz- You might be interested in seeing a photoshopped pic of the new low profile tinted windscreen I want to install. . If you'd like I'll email some photos to you as I can't figure out how to attach them here...and as far as I know there's no hook in the hull.

KenThe Green Keeper- I'd like to think with some tweaks that maybe this could be a 60 mph boat...especially if I can get the extra rpm closer to 5000. I'm getting varying opinions about whether rotating the props inward versus outward will have any effect. My boat is 5500lb dry.

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Old 07-16-2007, 09:42 AM
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you may want to try some different props like Merc Mirages.....they offer alot of bowlift and get the boat out of the water......made a huge difference in my twin sbc 29 Fever from the stock quicksilver props........and I dont counter rotate......you may also want to try some Revolution 4s or Bravo 1s.......

Ive been on this site for a long time and thread after thread prop expert after prop expert reccomend Mercury props for sterndrive boats........with the possible exception of Hydromotives on Fountains.......

Last edited by pullmytrigger; 07-16-2007 at 09:54 AM.
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Old 07-17-2007, 09:59 PM
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Update time! Water test last weekend and stopped to watch the start of RPBA's Jammin on the James poker run.

I got the 21P props back with reduced cup and got some needed rpm and got 55mph on gps. However, only the starboard engine turned 4700 rpm, up from 4500. The port side engine still only turned 4200 like before. The drives are in good condition, the engines only have 60 hrs and the butterfly valves on the carbs are full open at full throttle.

So I'm wondering why one engine would only rev 4200, even trimmed way out. I wonder if one engine is not getting enough fuel or if one carb is malfunctioning. I suppose I could swap carbs and see if the engines run any differently...or check for a clogged fuel filter or fuel line. What else could it be? Thoughts?

Also, I mocked up the chopped windscreen and the boat looks 10 years newer! Lovin it! Templates are at Norva Plastics in Norfolk, VA being fabricated as we speak!

Norva Plastics - Howard Everton - 3911 Killam Ave. Norfolk 757-622-9281
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Old 07-18-2007, 02:01 AM
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Before you switch the carbs, double check the timing. Make sure they are both on the money.


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Old 06-08-2008, 05:28 PM
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Hi, I am intrested in obtaining a windshield that you had made...I have the same boat as the yours. If you could please e-mail me with any information, that would be greatly appreciated.
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Old 06-08-2008, 09:49 PM
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Well it's 5600 pounds empty to begin with. With fuel etc probably pushing 6,000+ pounds.

A 28' 8'3" boat with no platform. I believe it has one step.The big factor is it's actually has a deadrise of 25 degrees.

A true wave hammer but it is a bit bow heavy and the challenge is keeping the bow/transom up. So they put a step on it hoping to provide a running surface that is flatter in the back.

The step is about 22-23 degrees...not a huge flattening..if you get my drift.It didn't work exactly as planned (speed wise). Wellcraft discontinued the model and went to a 23 degree deadrise instead of a step in or aorund 1992 in their 26'er. WIth T-350's it ran 65mph with a 23 pitch Mirage prop.

Your boat needs a prop with lots of cupping to get the transom up. The Hydromotive "Turbo" prop at 21 pitch. was the best for the boat with T-350's and it would get to upper 50's. A 23 pitch prop would overload the alpha drives.

The boat actually needs to have the power to turn a 23-24 pitch prop to get it excited at the top end.My suggestion is to enjoy it for what it is...or Whipple it up to a total of 800+HP and then you will see numbers around 70+mph with bravo drives.

I had one and drove several...fyi...advertised top end was not what the gps read...

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Old 06-09-2008, 07:47 AM
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Alright, I have the same boat but different power. I have twin 300 tempests, and regular replacement se 106 drives with 21 p cupped props. I am running 63 mph on gps @ 5200 rpms. I think I want to drop it down to the 4800 range. I tried running some 23p clevers which dropped the speed to 60mph. I like how it comes out of the hole with the 21p props, however I dont like the 5200 rpms @ wot. I like the 23p props for the wot but I am not impressed with any of the performance. Is the another prop I should be looking at?
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Old 06-09-2008, 11:29 AM
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Quote:
Originally Posted by cm1964 View Post
Alright, I have the same boat but different power. I have twin 300 tempests, and regular replacement se 106 drives with 21 p cupped props. I am running 63 mph on gps @ 5200 rpms. I think I want to drop it down to the 4800 range. I tried running some 23p clevers which dropped the speed to 60mph. I like how it comes out of the hole with the 21p props, however I dont like the 5200 rpms @ wot. I like the 23p props for the wot but I am not impressed with any of the performance. Is the another prop I should be looking at?
The boat is very sensitive to cupping and pitch as you know. Cleavers don't work that great. A four blade would be better with a big block I feel..

I think you need what is shown below: High rake and progression pitch. It will give you the best dead start/ acceleration..bow lift .all the way to top end. It will put your step to work...and you will get the speed you want at lower RPM's.

http://www.miwheel.com/MIWheel/produ..._main.htm#rapt


Get a 21p and you will be all set. Outside rotate them.
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Last edited by Hydrocruiser; 06-09-2008 at 11:38 AM.
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Old 06-10-2008, 07:25 AM
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Thanks is there anyway to try them before I buy them. I dont want to shell out almost a grand and find out they are not what I was looking for. I also talked to the prop shop around here and he said he could re-pitch my props to a 22p for $150 a piece. Any ideas on that.
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Old 06-10-2008, 10:26 AM
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I run 23p vented laser 2 on tha 29 scarab twin sbc. New drives last year 1.47 : 1 I believe is the new ratio , was 1.5 , 350 carb mags. Boat runs a solid 60 @ 4400. Don't think I'd go up in pitch if you can't turn up the 21's
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