Freestyle UPDATE PFRacing Amp Hull Build

A couple months ago I purchased this Amp Hull from a member, and boy was it ugly. This is another Dan Stein creation, it is a stunt hull bottom deck with some crazy top deck, that is then flat decked. To my knowledge there are 3 of the these hulls out there. One of them is mine, one of them is dans, and the other is another local rider(not built yet). The hull needed some serious body work, as most of his hulls I am sure needed, but it is much better at this point. I molded the front and had the hood fixed so it fitted better and looked cleaner. My painter did some serious sanding, priming and then 3 coats of Jaguar xkr-s blue and then 3 coats of clear, wet sanding and buffing in between each coat. The hull is 12 inches shorter than a stock RN, and with hood, pole bracket and pump shoe weighs about 60 lbs. The hull is very solid, but the tray flexes due to nothing below it. The so called fire wall is a little square piece mounted to the hull. I am not sure if i am going to run that or not. I was thinking of foaming the rear once I plum it with my rear exhaust tube, trim lines, coolant lines, and scupper tube. Then glass over it on the inside of the engine bay and form a "firewall". The other option is add more glass or carbon to the tray to stiffen it up. The engine bay is extremely open making it very easy to tuen the engine due to the carbs being above the engine bay.

My setup is going to include:

PFRacing pole -8.
X-metal Pole Bracket.
RRP Steering with riser bars.
Cold Fusion Finger throttle.
Pro-tech Trim system.
Skat swirl.

Engine set up is going to be an 800 polaris motor that my engine builder has built. He has dynoed it at 115 HP on 93 octane. I am either running a custom made dry pipe, or a stock pipe. I will provide more info as the motor comes along.

Here is the ski as it sits now. I will be working on it as I get time, since I am currently away at college, and as most of you know, as much as we would not prefer it, school comes first.
 

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Last edited:

Waternut

Customizing addict
Location
Macon, GA
60 hours...wow! Hope he's giving you a screaming deal or you're going to have to take out a loan...

One thing you may want to do when go to turf or redo the tray is to make it flat. You could do it with glass or foam but I'd highly recommend it. One thing about the stunts that I never liked was the sloping tray. It makes your ankles want to roll out on landings. Not a huge deal with a standard gunwales but with foot straps, you'll need to be careful.
 
Location
Bay Area
looks good! i think im the only one with my hull? give me some measurements! lenght? width? wish i had a nice hood like that! haha!

if you getting that far around on a flip with the yellow ski in your profile pic you should be flipping this no problem!
 
Location
Bay Area
i think i need to send mine to your painter too! mine is staying rough this year! untill i make sure it floats! and rides how i want it too..
 
Thanks for the info waternut. I will be reinforcing the tray with carbon, so before I do that Ill pore foam on the tray and flaten it out, then lay the carbon over that. I think I might make an adjustable foothold setup similar to the Light Weight. I have a few ideas and cad parts in the making. I should be getting to work on this at the end of the month.
 
UPDATE
Motor will be going in this week. I am just waiting on my SJ drive shaft. Should be riding it in the next 2 weeks.
 

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Weighed the ski today on a industrial scale. Came in at 185 lbs, with 2 gallons of gas. I rode the ski yesterday without a ride plate, because I wont have mine until tomorrow. I can not give a very good ride report, without the ride plate, but the ski is super light and should be a lot of fun. I will post a ride report after the weekend.
 

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I zeroed the scale and picked the ski up and set it back down, because I did not believe it either. I then weighed myself and it's spot on. Ready to ride with two gallons, 185 lbs.
 
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