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Author Topic:   1998 Conquest 21
edward j machnik posted 08-05-2010 02:54 PM ET (US)   Profile for edward j machnik   Send Email to edward j machnik  
I am [in the market for a used c.1998 Boston Whaler CONQUEST 21]. I have seen [used c.1998 Boston Whaler CONQUEST 21] with 175- or 200- or 225-HP [outboard motors]. [One in particular in which] I [have interest] has a 200-HP motor. [Is a Boston Whaler 21 CONQUEST with a 200-HP motor] enough power? [This particular motor is] a 2002 Johnson [motor with carburetors] and a [stainless steel propeller]. [Unclear, perhaps is asking for an estimate of the maximum speed of a c.1998 Boston Whaler CONQUEST 21 with 200-HP].

[The particular boat under consideration is] without trim tabs. [How does a c.1998 Boston Whaler CONQUEST 21 reach hydroplane] without trim tabs? [Would it] beneficial to install [trim tabs]? [If purchased, this c.1998 Boston Whaler CONQUEST 21 with 2002 Johnson 200-HP carburetor motor will be used] mostly [by] myself and [a]girlfriend on the boat. [Thanks] Ed

HawaiianWhaler posted 08-06-2010 10:26 AM ET (US)     Profile for HawaiianWhaler  Send Email to HawaiianWhaler     
My 1999 21 Conquest does not have trim tabs and planes easily without them, even with three guys (about 500 lbs) and over 600 lbs of fish, ice, and gear aboard. As you've read on the previous thread, I have just a Honda 130 powering it, for a top speed of 25 kts at WOT RPM of 5700. Seems like 200-HP should be more than adequate unless you're looking for the absolute highest speed you can get. On that other thread, some have said they get 30 MPH with a 2-stroke 200-HP motor and others have said they get 40 MPH with a 4-stroke 225-HP. I'll let those more knowledgeable of the performance of a two-stroke vs. 4-stroke address the top speed advantages of each.
Mambo Minnow posted 08-06-2010 06:56 PM ET (US)     Profile for Mambo Minnow  Send Email to Mambo Minnow     
Mine has the Bennett trim tabs. First time I have had them on a boat. I find them useful going into a head sea to get the bow down. I also find myself trimming them down on first hole shot to get the bow down quickly when towing tubers/skiers. I have a family of six, so I find myself adjusting lateral stability depending on where they are seating/moving to and from while underway.

Overall, I'd say it's a good option on a boat of this size. Another recent poster inquired where to place new Lenco tabs he was installing on a Conquest 21 without them. Use the site's search function to learn more if interested.

tesija posted 08-08-2010 01:48 AM ET (US)     Profile for tesija  Send Email to tesija     
My 1999 21' Conquest has a 200 HP Optimax. It does OK, but I think I'd go up in horsepower when it's time to repower. The trim tabs help to balance out the load more than anything else. The boat itself, especially the hard top version, is about as an ideal boat in its class as I could possibly imagine. In fact, I like it much better than the newer version.
jimh posted 08-08-2010 03:11 PM ET (US)     Profile for jimh  Send Email to jimh     
From the original Boston Whaler literature, the recommended minimum power for a c.1998 Boston Whaler CONQUEST 21 is 135-HP. An outboard with 200-HP is substantially above the minimum recommended horsepower, and I would expect that a c.1998 Boston Whaler CONQUEST 21 with 200-HP motor would not have any problem getting onto hydroplane with two people aboard.

I would not base my choice of which particular used boat to purchase based on the presences or lack of trim tabs installed on the boat. Trim tabs can always be fitted to a boat that does not have them. Trim tabs that were original with the a c.1998 boat would be 12-years old, and, if the boat were operated in saltwater, they would probably be due for a re-fit anyways. My advice to you is to ignore the presence or lack of trim tabs in making a decision on which used Boston Whaler to purchase.

I do not have any performance literature about a c.1998 Boston Whaler CONQUEST 21 with 200-HP, however I am confident that with a 200-HP engine the boat will be able to reach just about any speed that sea conditions will permit, up to around 40-MPH in a flat calm sea. It is my experience that the maximum top speed of a boat is generally only used about one-percent of the total underway time. No one really runs their boat at maximum throttle for more than a moment or two.

The c.1998 CONQUEST 21 was rated for a maximum of 250-HP. If you find a boat with a 200-HP engine you will be able to reach speeds that are about (200/250)^0.5 or 89-percent of the speed possible with a 250-HP. If that last ten percent of speed increase is absolutely necessary for your enjoyment of the boat, you should look only at models with the 250-HP engine. Otherwise a 200-HP engine should be fine.

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