Wich Props for my 41" Zonda/Carbon Cat ? (from Horracing)

[Mecka1990]

Hi Guys!

i got my Boat, and drivd it Today, IT LOOKS SO AWESOME! but...... its so slow, cant understand that

Setup:

2x SSS 36mm 2075 KV Motors 4 Pole
2x Swordfish 200Amps Plus Esc
2x 5s Lipo with 50/100 C 4000 Mah
2x Counter Rotating 40mm Cnc Props (without lift)

how i said i drived it today, and had think i get around 00-120 km/h out of it, and what i get is not cool, only 55 km/h best drive :-( my spartan is faster hehe

what i can do? i did something wrong?

the props are running to the middle/inside, is that ok? or i must change them to the outside?
The motors and ESC dont get hot, after 2 Minutes 80-90% Throttle they stay very very cool, maybe a bigger prop? like 43-49?

[srislash]

Inside or outside depends on how it handles.Which changes with speed. I'm going to say that 40mm props are tiny on that hull.Jump up to some 45mm and go bigger as temps check out.

[Mecka1990]

gonna do, the problem is, the cnc props i looked counter rotating going only to 43 -.-^^

[srislash]

Fightercat has 45mm and 48mm in 1.4 and 1.6 in 2 blades.They seem to be back up and running for orders.RC boat Bitz in Aus should also have a good selection http://shop.rcboatbitz.com.au/index....ort=20a&page=2 .And not to mention these guys http://www.prop-shop.co.uk/index.php...roduct_type=25

[Mecka1990]

thanks for the links, you helped me much :-) Hor gonna send me 45mm cnc counter rotating for free because i get the wronf hull (ordered full carbon get the better but bader looking kevlar version) i try the, if no overheating i go for bigger with lift^^

[keithbradley]

If you want help, get some video of your boat and post it. You could have something way off with the setup, or it's just the (too small) props not getting the boat out of the water.

[petej]

Use the OSH speed calculator to estimate top-speed capacity for a motor, volts, prop dia/pitch, http://www.offshoreelectrics.com/conversion.htm.

My ZondaCat came with Aluminum, 442 (42 mm, 1.4 pitch) props (I balanced and sharpened) and running on 4S 30C batteries, on choppy, rough water, the GPS registered the top-speed of 42mph. Motors are stock, 3674 2075kv and I'm using, 120A ESCs. 42 mph is about what the OSH speed calculator projects. According to the OSH speed calculator, with these motors:

50 mph: 4S batteries, 45 mm props, 1.6 pitch or 5S batteries, 42 mm props, 1.4 pitch.
Greater than 50 mph will require bigger motors.

[ALIENALESSIO]

Hi Mecka,

Did you figure a good set up for your Zonda. Im running my Apparition on 2x5S lipos, T180amp ESc and 2560kv 4060 motors with M447 props, speed is over 80mph.
The first stock setup on my cat was really slow, barley made 60mph, after adjusting and changing you will have your Cat fly like mine.

[ray schrauwen]

The motors are 4 Pole SSS HOR/TP Power. They are a D wind and lower timing may be a better start.

Well, you are missing one piece of information that I would like to know............motor brand, motor wind and number of poles. Until then I stand behind my 442's

[ray schrauwen]

Try sharpening your props. CNC props still need to be sharpened.

Hi Guys!

i got my Boat, and drivd it Today, IT LOOKS SO AWESOME! but...... its so slow, cant understand that

Setup:

2x SSS 36mm 2075 KV Motors 4 Pole
2x Swordfish 200Amps Plus Esc
2x 5s Lipo with 50/100 C 4000 Mah
2x Counter Rotating 40mm Cnc Props (without lift)

how i said i drived it today, and had think i get around 00-120 km/h out of it, and what i get is not cool, only 55 km/h best drive :-( my spartan is faster hehe

what i can do? i did something wrong?

the props are running to the middle/inside, is that ok? or i must change them to the outside?
The motors and ESC dont get hot, after 2 Minutes 80-90% Throttle they stay very very cool, maybe a bigger prop? like 43-49?

[steveo]

just curios did u get the right and left wound cable for ur boat, i know this is not part of ur problem just did not say in first post

[steveo]

did u look at the data log on ur boat ur escs make sure u r getting 100% throttle, i have the same esc and used a different radio than normal and on my last run it read only 95%
i know u only said u were going 80-90% throttle get it back on the water and give it full throttle just to see if the escs r giving u 100%

[Mecka1990]

Hi Guys, a looong winter this year, from the last post i dont change anything on my Cat, must wait for sun, atm -12C, everything frozen and i cant run it ;( when it get better i go for 45mm props for my zonda and 40mm motor from leopard, about 2000kv

[Mecka1990]

yes they give me 100% throttle, thats the problem, the hull takes 3 seconds to go out of the water and get some speed, that seems to be a problem with the esc settings and props, he need more power to go out, if he gets out it looks like jesus walk over the water, very well without any influence on the speed, but still to slow, last gps 34 km/h, thats definetly to slow, i wanted to go for 60 mp/h with this setup, thats what hor said.

edit: just figured out that the esc´s dont give 100%, 100% = the led is solid green, mine is flashing...

[Mecka1990]

maybe change the settings of the esc to timing auto and fast startup and 16 kh/z and try? if the motor get hot i get it back to shore instantly

edit:

esc´s was setted up ok

lvc 5s, startup type: standart, khz: 8, timing: auto

my spektrum dx20 makes the problem, cant get 100% throttle, the esc is not solid green when i give full throttle, setted it already up to 125% throttle but it doesnt helps, setted the esc´s about 20 times new, still same problem, contacted hifei via skype and get the new firmware for the 200 plus version. must test tommorow when im alone at home to get 100% throttle, the boat is to load at home, the neighbor dont likes me any more :p