Help - i really need some advise- conquest

[GRAEME LOUW]

Hi Tyler
Thanks. Please tell me would a 1.5y or a 2Y be beter on 10 cells. I see Steve has no Neu 1.5 Y in stock. Would the Neu be faster than the Casltle - top speed. And is a 240 amp ESC enough or should I use the S Fish 300 amp.
Also what do you recommend What is the best a Swordfish 240 or the Etti 220 ESC. ?
Thank you so much
Cheers
Graeme

[Fluid]

The 2Y is a better 10S motor, as is the 2028. Otherwise you are in the same situation you were with your original setup - too high of a Kv. I would not expect much difference in top speed with either the Neu or Castle motors. You can go very fast with the 2Y, but you will over-tax cheap packs and ESCs with the 1.5Y if you try to push it. Here are some cheap Turnigy packs which were run in a 10S cat for a one-mile race heat; the motor Kv was around 750 with top speeds around 110.....

DSC00028.jpg

[GRAEME LOUW]

Thanks Fluid
Ooch Those batteries sure look sick
I am using 45-90 C Nanotechs all round
Thanks for all the help !!
And is a 240 amp Turnegy and Swordfish ESCs enough. Are they not the same thing !!.Is the ETTI 220 amp a beter choice or do I go all out to the Swordfish 300 fully waterproof ESC. Or is this overkill !
HUGE DOLLARS !! For a South African at a EXCHANGE RATE OF 8.5 -1 ,BUT I WANT IT
Cheers
Graeme

[GRAEME LOUW]

Howzit Fluid
ME AGAIN .Sorry to bug but I have another Question
Would the Neu 2215 2Y RUNNING WITH 12 CELLS BE A BETER BET @ ABOUT 33000RPM than 10 cells @ 27750 rpm
I see the Neu can max at 55 volts and my rpm would be higher ie more speed. Am I correct in my logic.
How would the ESC hold out with 12 cells
I want to place my order with Steve but I want everything to be correct as I have wasted a lot on Chinese crap !,I also live about 3000km away from you so I cant mess up

Cheers
Graeme

[RaceMechaniX]

Graeme,

The 2215 2Y is a better 10S motor. The 1.5Y suits 8S better. The 2028 runs quite good on either 8S or 10S. And yes if possible run 2P.

I would not run the 2Y on 12S as you will be in the same situation as the 1.5Y on 10S. Too high an RPM to reliably prop.

TG

[siberianhusky]

You already stated the wattage of the motor, do the math and see what the numbers look like. You already know the potential amperage of the esc, you know the voltage of the packs. You've got all the info you need to figure out what your maximum potential wattage will be.
Basic electronics from grade 9, one of the first formulae you learn right after ohms law.

[Fluid]

I see the Neu can max at 55 volts and my rpm would be higher ie more speed. Am I correct in my logic.....

You have to be careful using motor specs in that manner. The best way to calculate the voltage with a certain motor, or to pair a motor with a certain voltage, is to multiply the motor Kv times the nominal pack voltage. For most uses the result should be between 25,000 and 30,000 rpm. This will not be the actual rpm on the water under load, but it is a good general rule of thumb. The higher the calculated rpm value, the more difficult and risky it will be to prpo and run the boat. Some guys get by with values well above 30,000 rpm, but they are experienced and understand the risks involved.

You can achieve great speeds turning under 30,000 rpm by balancing the motor, prop and ESC so that you have good reliability. Heck, the gas guys get over 70 mph with that hull spinning well under 20,000 rpm. Tyler's advice is spot on.



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[GRAEME LOUW]

Thank you all
A final few questions before ordering. Please be patient as I am new into the FE Boating.
1 - Castle 2028 or the Neu 2215 2Y For 10 CELLS ( Is the savings worth buying Castle)
2 - What ESC Etti 220 ; Swordfish 240 ,Swordfish 300
3- What range of props do I order from Steve as I must bring in everything one time as we cant get much here in SA

Thanks
Graeme

[GRAEME LOUW]

Hi Guys
Please some answers to my last post
I really need to buy the goodies while there is stock at Offshore
Cheers
Graeme

[Fluid]

1 - Get the Castle. Cheaper, great performance and over a pound heavier than the Neu. The Conquest can use some weight to keep it on the water if you are looking for 120 km/h.

2 - I know nothing good about any of those controllers.

3 - The default general prop is the x462. If you want more speed and are willing to give up some run time you can try an x465, just be careful and watch the heat. An extra x462 could be detongued and pitched up too. For lower speeds an x457 or x460 will work.


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[lomdel]

Graeme, I am from SA as well, Bloemfontein. Been here on OSE for a looong time. If there is one guy to pay attention to, it's Fluid. He's been helping me a bit with my Thundercat 31 brushless conversion too in the past. I run a Feigao 11XL off 6S from a Etti 200A with a P210 prop. Got good speeds, but not SAW quality runs. To answer your questions regarding the ESC's, go for one that's programmable, like the Turnigy or Swordfish. The Etti programs with a lot of confusing beeps and blinking lights... That being said, powering an expensive Neu or Castle through cheap ESC's is not ideal. A castle 240A HV ESC is probably a better, although much more expensive option.

Good luck with this build, PM me if you would like to chat...

[GRAEME LOUW]

Hi Fluid and Lomdel
I have got so much good advise from this forum over the last week !
I have been flying rc planes and helis from a early age and got into electrics just after it started in SA .But the electric boats have screwed me. I have spent a fortune on motors ESCs etc and either can get the speed or blowing things up !!
I will order the Castle later today from Steve and all the other goodies.
My first attempt at FE boating was fron Fine Design and it was not pleasant and it cost me big dollars.
Lomdel, I see you are from Bloemies. Really great to see another South African on a US forum. I was born in Welcome and went to Saint Andrews school in Bloemfontein.
I now live in PE . I have licences for full size gliders as well as motor gliders
And in winter I live for my hunting
Cant wait to get my boat going again. Have to beat the gassers.
Cheers guys and thanks for all your time and advise
Chat soon
Cheers
Graeme