Looking for set up of FF21

[Jerry Muro]

I am looking for a proven set up for a FF21. I am having a problem getting my 21 to get off the beach. I have the AOA at 3 degrees prop 1450 cut tio 46 mm/strut flat/rear sponsons 1/8 above strut/ tub to flat surface 13/16 and strut 1 1/4 " from falt surface to bottom of tub. Motor proven Rod G NR. What am I missing?? Jerry

 

[Tim_Duggan]

Not enough AOA on the fronts. Was it a kit boat or built from plans? Edges sharp & the ride areas dead flat on the sponsons?

For the kit boat, 3.6 - 4.0 degrees on the fronts and the tub raked at 1 degree (rear higher). Tops of the rears at zero, bottom of strut 1/8" BELOW rears and almost zero angle. This set-up is about as proven as it gets here in Oz.

 

[Jerry Muro]

Not enough AOA on the fronts. Was it a kit boat or built from plans? Edges sharp & the ride areas dead flat on the sponsons?

For the kit boat, 3.6 - 4.0 degrees on the fronts and the tub raked at 1 degree (rear higher). Tops of the rears at zero, bottom of strut 1/8" BELOW rears and almost zero angle. This set-up is about as proven as it gets here in Oz.

The boat was built with plans and cut out,edges are sharp, what is the AOA on this type? Should I be higher on degrees? And were should the rear sponsons be when tub is leveled? I see zero on top but is this off the flat surface or on? I also see strut 1/8 below rear's just need to know were rears get set. Also what prop mine is as stated 1450 cut down,should I try a ABC H4?

 

[XtremeRcBoats]

Not enough AOA on the fronts. Was it a kit boat or built from plans? Edges sharp & the ride areas dead flat on the sponsons?

For the kit boat, 3.6 - 4.0 degrees on the fronts and the tub raked at 1 degree (rear higher). Tops of the rears at zero, bottom of strut 1/8" BELOW rears and almost zero angle. This set-up is about as proven as it gets here in Oz.

The boat was built with plans and cut out,edges are sharp, what is the AOA on this type? Should I be higher on degrees? And were should the rear sponsons be when tub is leveled? I see zero on top but is this off the flat surface or on? I also see strut 1/8 below rear's just need to know were rears get set. Also what prop mine is as stated 1450 cut down,should I try a ABC H4?

Also have a look at the FF21 building instructions, at the end is also a setup sheet:

http://www.firefighterboats.com/ff21.pdf

(taken from the firefighter website: http://www.firefighterboats.com/)

 

[Terry Flynn]

Im far from being an expert on hydros, But I would start at about 3.5 to 4 deg AOA, try setting the strut 1/16 below rear sponsons and yes start with an H4 I had problems trying to get mine to run with an 1450 also till I got it clost to a good set up. now it will spin the 1450 but I think it's still to much? so far I've had the best results with an H5. also set you pipe at 3.5 from the plug I found this to be a good starting point.

hope this helps.

 

[Tim_Duggan]

I set the rake in the tub with the rear sponsons off the boat and use the strut on the set-up board. then I attach the rears by sitting a piece of 1/8" ply on the board so the t/e of the rears can sit on it. The strut is still contacting the board. I then use the angle meter on the top of the rears and set that to the same angle as the set-up board (Zero)

Of course this depends on the thickness of the strut tube. I have a round bottom strut that has a thin tube, so the botton of the flex shaft is about 1mm above the bottom of the rears.

I use either a 1450 @ 46mm with 3.75" cup or a H7 with 3.75" (Ozspec). Novarossi RX21 motor, SPP TD21 pipe. A friend's boat (also a FF21) uses 1450 @ 46mm 3.6" with a SPP outboard pipe (novarossi 7M), and another uses a Novarossi PLUS with a 1450 to unknown specs.

Also, the FF21 runs light on the fronts, so if's it's not, keep lowering the rear boom until it's just too wild to race with, then raise it back up a small amount. Don't forget to re-adjust the turn fin angle!!

If you have a 3rd channel mixture arrangement in the boat, sometimes richening up a few clicks for the launch can help and once it's up on plane leaning it back down again can be a useful practice. A friend uses a 3/4 throttle approach until it's up on plane rather than using CH3.