Summer toy for TY riders

[Sled Dog]

I have no idea. Runs good though. lol

 

[LazyBastard]

Well, assuming a 1.5:1 gear ratio (probably about reasonable for a sterndrive), that would calculate out to 49.4 mph. Now I tend to associate sterndrives with big heavy bulldozer boats that never really get on plane (is that correct?), so you're probably loosing about 7 mph. Who knows. 42 might be reasonable, or maybe the spring in your speedo is old and weak.

 

[Sled Dog]

It is a 17 foot Glascon single hull. It is fairly heavy but it does plane out since I put the whale tail on.

 

[SoCoRX1]

while you guys talk boats, im going to buy 2 grizzly 660's in the summer

 

[Indy]

When you are going 75 to 100, and you have to stop, what do you do? Hit the brakes?

 

[Skydog]

Slowing down from 100+Mph is the hardest part you must do it SLOW and SMOOTH. From 70MPh is no big deal! If not the bow will drop and hook! I spun out one time at 95MPH!!(prop loses bit and the bow drops) I thought i was dead! I over trimmed and was going to fast in some snotty water. BOOM i was aginst the side of the boat looking at the water feeling Gs like made! Boat did not flip.

Skydog P.S.LazyBastard your numbers sound alittle funny with that hP and hull?

 

[4Fighter]

How about a 23' 1968 Chrysler Clipper 486 Hydro-Vee I/O with a 360 c.i. V-8, 2bbl carb, Dana out-drive, does about 25 NMP?

I have been in the process of fixing this boat up for the past 2 summers, very stable hull design.

O.K. So It's not a Yamaha, but it is a 4-stroke

 

[DoktorC]

Here's a good bit of reading for you that explains the relationship between rpm, pitch, and speed given a cupped prop:

http://www.hydrocompinc.com/knowledge/t ... ex0402.htm

The cup makes the prop into a hydrofoil, rather than just being a simple ram. Means you get more thrust out of the same pitch.

You get more thrust out of the same pitch at slow speeds or in high cavitation situations. When the boat speed is higher and the load is light it will produce similar top end numbers to a its effective pitch. That being said if we're getting into a pissing contest over boat speed...I think Skydog wins lol.

What kind of prop do you run? Is it a Yamaha? How high is the engine mounted on the transom? I've got lots of props if you ever want to try to prop that thing (even though you insulted my ride).

 

[Black 1000]

Hey Doc I've got a 87 balsa core charger with a 2.5 yamaha 2 stroke does 80 per with the old pilot only had it 75 per with me. Girlfriend pee's a little at anything over about 65 per

 

[DoktorC]

I didn't know you had one!! You should have said something lol. My true love is boats..if you can imagine!! I would have liked to see yours.

 

[Srxspec]

You guys mean to tell me you don't ride your sled in the summer too?

 

[LazyBastard]

Here's a good bit of reading for you that explains the relationship between rpm, pitch, and speed given a cupped prop:

http://www.hydrocompinc.com/knowledge/t ... ex0402.htm

The cup makes the prop into a hydrofoil, rather than just being a simple ram. Means you get more thrust out of the same pitch.

You get more thrust out of the same pitch at slow speeds or in high cavitation situations. When the boat speed is higher and the load is light it will produce similar top end numbers to a its effective pitch. That being said if we're getting into a pissing contest over boat speed...I think Skydog wins lol.

What kind of prop do you run? Is it a Yamaha? How high is the engine mounted on the transom? I've got lots of props if you ever want to try to prop that thing (even though you insulted my ride).

Actually, if you read it carefully, it makes an *efficiency* improvement (how hard it will pull with the same power) at low speeds, it makes a *performance* improvement (higher effective pitch - more distance thrust per revolution, but adds load to the motor) at high speeds.

It is a Yamaha prop that I have, motor mounted at 23", but I really don't care to try to make it any faster. I'm not about speed in a boat, speed is more a side-effect. I selected the engine and prop for *efficiency* at moderate speed. My point was only that with twice as heavy of a boat and less power, I'm really not that far behind in top speed.

My *previous* boat (which I had the same motor on) was an old Chrysler Conqueror (16 foot). It was a much lighter boat than I have now, but its top speed sucked. Couldn't get it over 60. It was also deadly unstable over 55. I don't suppose you would want it? Cheap.. (I just want to get rid of it)? It just needs a motor and to be repainted.

 

[wolfman]

What year is the Conqueror? 73, 74? Does it still have the hook molded into the fiberglass where the stern and the bottom meet. My dad had one back in the 70's and did 55 mph with a 120 Chysler on it, and was very stable, but then my Uncle ( who worked for Crysler outboats in the r&d dept.at the time) sanded off the hook an turned it into a piece of crap. Made it very unstable at high speeds.

Wolfman

 

[DoktorC]

So...let me get this straight....you don't know why I would put a $15k on a charger, but you put a $15k engine on a early 70s conqueror...come on.

Nice superjet though! I could never master the standup. Spent more time swimming then riding.

 

[DoktorC]

Here ya go Allen...