Flash3x wrote:
Hello all, new member here. I have been lurking for awhile since I have been rebuilding my '88 Horizon 200. Great info here. First I will give a little background before asking questions.
I've been wanting to get back into boating for the last five years or so. Last October I purchased the above mentioned boat from my girlfriends uncle. The interior was shot and needed a total replacment. The hull was supposed to be red but looked more like pink. The Cobra outdrive was corroded, and the prop is banged up pretty good. Sounds like a nasty boat eh? But the hull was solid, the 305 Chevy (230HP) motor was new with about 10 hours on it, and I picked it up for $1500 with trailer. After buffing out the hull, stripping the interior down to the fiberglassed deck, re-glassing the deck, and rebuilding the interior I now have a boat that has gotten 6 "NICE BOAT!" compliments in four outings. Total investment so far is $3200. I am pleased with that. The outdrive is still corroded but shifts "almost" with a finger and it still holds oil so it is staying put for now.
I know there are a few here with the same style Horizon as mine and my question is directed to them. I currently have a banged up SST 15x17 prop on this boat. Top speed at 4500rpm is 42mph(gps). Cruising at 3000rpm gets me 25mph. The holeshot is OK with two people up front but if you put two people in the stern seats the boat will pretty much stand on end and does NOT want to get on plane but will with alotta throttle. Prop slip work out to be 22% at 3000rpm and 13% at 4500rpm, I think.
Is anyone running the same prop with similar results? I have seen that some boats are running a 14.5x19. Is this a better choice? Is anyone running a 4 blade? I have heard good things about the Renegade Offshore, mainly a much improved holeshot with no loss of top end.
A 45 to 50mph top speed would be nice but a lower plane speed would be more helpful. Currently it planes out right around 22mph.
Thanks
Welcome!
I have a similar boat, 89 Horizon 180, and I have had a similar project like you, my floor was trashed and is finally fixed. However my boat is a 4.3l V6.
I run the stock 15x17 prop. However my boat has a pretty damn good hole shot, and is on plane with ease no later than 2700, and can easily stay on at 17 or so MPH (according to my Speed-o). However I do have the same issue with 2 people in the rear seats, or more than 4 people in the boat.
As far as I can tell my boat runs out of prop at 5200rpm, and is running approx 37 or so on the OEM speedometer.
I have been thinking of upgrading to a stainless and I am wondering about similar questions that you have.
_________________
Rob

Present: 1999 Formula 280SS
Past: 1989 180 Horizon
http://www.robcamerondesign.com