1/8 th hydro exceed hull could use advice

[lunadio]

i am building a 48 1/2 inch exceed hydro leopard 5692 1000 kv motor fightercat 300 esc and motor mount esc is good for 16s lipo power. i still have the 76 mm stock gas prop looking for ideas from you fine people to help finish it off any ideas would be appreciated as this is a learning process for me and lotsa fun.IMAG0007.jpgIMAG0008.jpg

[Espresso]

What lipo setup do you plan to run?

[lunadio]

im not sure hoping somebody could give advice? was thinking 10s turnigys they are priced right but don't know alot about batteries

[puttekula]

I think for such project a 10s setup and a much smaller prop than the gas one will do fine.
Maybe start with a 52-55mm prop?

[lunadio]

what kinda rpms would i be turning ? and could a smaller prop still get this thing out of the water ? forgive me im a rookie have more money then brains to put in this boat

[puttekula]

3.7 volt x 10s x 1000kv gives 37000 rpm. Thats pretty much but within specs for the motor. (40v)

So I think a quite small propp is better to start with.

[Fluid]

Please do not listen to guys who have no experience with large 10S boats! They may mean well, but they often give bad information based on their ignorance of the demands of large expensive boats. Of course they can afford to be wrong since it isn't their money going up in smoke. That is way too much motor for 10S, you will be burning down your cheap packs and the ESC with alarming regularity even with an appropriate prop. You could run 8S packs with that motor, but then your amp draw will be high and run time will be short. I recommend selling that motor and getting one with a Kv in the 750 to 850 range. That will work much better on 10S with lower amp draw and longer run times. The Castle 2028 is perfect and higher quality than the Leopard (and more costly), but I suppose a Leopard will work.

You cannot use gas props that large in the typical FE boat. Props in the range of x457 to x465 will be much better suited to your large hydro setup. As far as packs go, shoot for cells with a minimum of 40C and 5000 mAh, running 10S2P. That is a safe, proven combination as long as cell quality is there.

Here's my 10S, 65 mph cat.



.

[lunadio]

thanks fluid maybe 8s is the answer found a chart says 1000 kv 29.6 volts 29600 rpm is that about right what can my motor handle ?

[JIM MARCUM]

Steve, Jay is a great guy & knows more about FE than 99% of the OSE followers. But, in this case I disagree about NOT using the 5692 1000KV Leopard motor you already have. Running 8S2P (8 cell LIPO, 2 packs) (29.6V) is within its rated max voltage of 30 volts. You might consider 6S2P to start off - you can always add more two 2S LIPOS in series later. As to props, I'd start off with an Octura X442 or X447. Make a couple of passes & use an IR temp gage to check motor at the shaft, ESC, and LIPOS. Motro/ESC should be at <130 degrees. If the temps are OK it could be proped up using the X6xx series as they have more pitch.

If you have a lot of nitro boat driving experience that will help. But, if you are new to FE, I suggest you keep your boat speed no higher than 55 MPH until you feel comfortable driving it. The setup I recommended can easily hit the 80s, so I'd set the throttle end point at 70% to start, prop down to an X435, and/or run 6S2P Lipos. The slower you keep it the longer the run time. The longer the run time the more fun you will have. And, a crash in the 50s is less likely to damage your boat. A crash over 70 can rip a boat in pieces. Over 80 a crash will cause damage to the hull. Crash at SAW speeds & you'll need a diver to pickup the pieces.

I think one of the reasons Jay is opposed to hyper boat speeds, especially for newbies, is you will probably have a lot more fun with a conservative setup that will run all day long in the 50s, get longer run times, and won't burn up motors, ESCs, LIPOs, or ruin your hull. Too many people get into FE and shoot for the max top speeds. Then they either crash or burn everything up, including a hole in thier wallet. Bummed out they leave the sport.

Both Jay & I want to grow this FE sport. Start off being conservative with your setup and simply have fun driving your boat. If the racing bug bites you join a local NAMBA club and learn what the other guys are doing to be competitive.

Bottom line: It's more fun to drive a FE boat than it is to watch it burn or pick up it's pieces. JIM

[lunadio]

thanks jim i didn't even know the limit on my motor getting conflicting ideas 30 volt and 40 volt ??? . I would rather build something in the 60 to 70 mph range , i already wrecked my spartan twice on 6s. Im getting used to driving a bit more but im gonna be more careful with this one. Love that spartan but man what a crap hull if only it was fiberglass they would sell alot better. Im looking for a replacement hull i can put all the guts from the spartan in but can't find anything the same .
.

[JIM MARCUM]

You might consider buying an 44" Aeromarine Avenger catamaran. It's American made, tough as nails, and is a great hull for NAMBA T Offshore races. I'm building one for the FE Nationals at Legg Lake in June. Running a Leopard 5692, of course.

Oops! Included my BlackJack pic. JIM

[lunadio]

Model: LBP5692/4D
Max Amps: 78A
Lipo Cell: 5-10s
Max Power: 5500W
KV(RPM/Volt): 1000KV
Resistance: 0.0073
No-load Current(15V) : 3A
Diameter×Length (mm): Φ55.8×92
Mounting hole depth: 8mm
Length of extend Shaft : 20mm
Shaft Diameter (mm): Φ6.0
Weight: 880g

[lunadio]

found some specs on motor

[Make-a-Wake]

Here's my Exceed 1/8 on 9s2p 10,000mah. You will be drawing upwards of 200 amps in order to get great speed, especially with a 1000kv motor. I run a Castle 2028 780kv and swing a Prather s270 cut down to 60mm. I could have gone 10s2p but then the prop would be small and the boat would have trouble getting up...........I tried it.

2p batts are a must.................no sense in trying without it as you will hurt the ESC and most likely bloat your lipos.

Fluid is correct on the prop................my boat also likes an x462. You may want to start off with an x455/57 on 10s if thats how you want to go............fine line there between gettin her up and too much prop............I'd strongly suggest 8s........or 9s MAX!

Highest attained speed is 60 mph and highest recorded Watts 8800.

[lunadio]

leopard is only rated for 5500w