prather spitfire II setup tips

[mark holton jr]

does anyone have any setup tips for a prather spitfire II.i got this in the x-mas give away two years ago and finally got a motor coming for it and need some info.the motor is a K&B with tuned pipe.

 

[Ray Sametz]

Set the center line of the prop shaft even with rears at 0* angle, make sure fin is parallel to center line of boat. Ran mine with an exhaust trottle. Use a push, pull on the steering. B)

 

[mark holton jr]

thanks for the tips ray.

 

[Duck899]

As Ray mentioned, used to run with a 707 products exhaust throttle and a pressure line tapped off the engine lug into the case (crank case pressure) and a hogged out hole where you normally mount the venturi with a racing spraybar needle assembly. 1740/3 blade prop and go like hell....rpm to 30,000

No pipe required.....change bearings every 3-4 runs.....lol

 

[Ray Sametz]

As Ray mentioned, used to run with a 707 products exhaust throttle and a pressure line tapped off the engine lug into the case (crank case pressure) and a hogged out hole where you normally mount the venturi with a racing spraybar needle assembly. 1740/3 blade prop and go like hell....rpm to 30,000

No pipe required.....change bearings every 3-4 runs.....lol

Thanks Rob, could not remember the prop. 1740/3 was the ticket. B)

 

[TonyKilbarger]

Isn't a Spitfire 2 a 45 size boat? 1740 sounds small. I ran a 1752 3 blade on mine, about 60 mph with Prather's exhaust throttle and offset skeg setup. Fun boat.

 

[Duck899]

Sorry, if this is a 45 boat, I have no clue.... thought it was the 21 hull....Good catch Tony....I'm gettin old.....lol

 

[mark holton jr]

yep its the 7.5

 

[Ray Sametz]

Well Mark, Thought it was a 3.5, good catch and info Tony. That's what IW's all about. B)

 

[mark holton jr]

no problem ray, il get her going one way or another lol.

 

[OB HYDRO]

I am setting mine up for SAW.I will be using a Rossi for power.Sold the stock K&B i had.I am going to blue print the riding surfaces and try to lighten it up.I thought about removing the turn fin and brackets.

 

[OB HYDRO]

I think the spitfire 2 holds the SAW record for the class.

 

[moparbarn]

I am setting mine up for SAW.I will be using a Rossi for power.Sold the stock K&B i had.I am going to blue print the riding surfaces and try to lighten it up.I thought about removing the turn fin and brackets.

the sundowner is still available through joe at 707 specialities. the spitfire was a copy of the wood sundowner, & my sundowner .21 was MUCH faster than my spitfire 1. not sure if that will hold true for the 7.5 version. tried the 1740's, traditional rigger props (1445/h-5) were faster on my cmb TT/sundowner combo.