2 ul-1 motors and esc's in 30' cat

[rcboatfan]

would this be enough power for a 30 inch cat?? i would run 4s for each motors. would the escs be a high enough amps??

[z400]

For the power it sounds your looking for, why not just run 2 Ammo 2300's and atleast 2 120amp esc's

Im sure the stock UL-1 esc's will be fine but theres nothing wrong with a little extra to play with.

[Brushless55]

That thing would fly on two UL-1 setups!

[Simon.O.]

I have done a lot of reading and research on twins in a Cat.
I can say this.
A 30"cat is on the edge of single to twins. yes there are a few small twin cats but they in general are the exception.
Up to 32" a Feigao XL on 4S will move out well...I am told.
Over 32" twins become a good option. The HPR 114 (40+") will clear 60mph on twin XL motors, if it is set up well.
I have no experience with the UL-1 package but believe it to be a solid combination. It is designed primarily for Hydros but as part of a twin in a Cat would be a contender for some good speed.
I have seen twin Cats as small as 18" and as large as 44" for my research. I am sure there are others.

If I were to use a pair of UL-1 motors I would be looking at 30" and a bit.

Do you have a particular hull in mind ??

I am keen to see what you have and will do as I love twin cats. I don't have one......yet.

[Brushless55]

My guess would be in the uper 60's low 70's with twin UL-1 in a 30" cat

I'm thinking of going with twin SV27 motors in my Mean Machine, that should scoot!

[rcboatfan]

I have done a lot of reading and research on twins in a Cat.
I can say this.
A 30"cat is on the edge of single to twins. yes there are a few small twin cats but they in general are the exception.
Up to 32" a Feigao XL on 4S will move out well...I am told.
Over 32" twins become a good option. The HPR 114 (40+") will clear 60mph on twin XL motors, if it is set up well.
I have no experience with the UL-1 package but believe it to be a solid combination. It is designed primarily for Hydros but as part of a twin in a Cat would be a contender for some good speed.
I have seen twin Cats as small as 18" and as large as 44" for my research. I am sure there are others.

If I were to use a pair of UL-1 motors I would be looking at 30" and a bit.

Do you have a particular hull in mind ??

I am keen to see what you have and will do as I love twin cats. I don't have one......yet.

i got some plans from jesse j, her are some pics of the plans

[lomdel]

For my 30" Balsa/Ply twin cat I plan to use two 540 9L's on 3S1P each through a set of 120A Marine ESC's and turning a set of counter-rotating X442 props. That should get me up to 45mph at least. I am unsure wether a balsa cat of that size can handle any more speed than that.

[rcboatfan]

what would you people think about 2 feigao 7xl's on 4s for each motor

[Fluid]

Depending on the hull design, a 30" cat is on the verge of being over-powered with two UL-1 motors. It will be reasonably fast, but you'll spend plenty of time upside down especially if the water you run on isn't very smooth or if the wind blows. 70 mph? Nope, not even close, just not enough Kv/torque for the hull/suitable C/R props. But it should still be fun, you can always prop down.

Do not waste your money on twin 7XLs and 120-amp ESCs, that will be grossly overpowered and you will not be able to give the boat full throttle very often. The best solution is to get a cat designed for speed/power like the 34" Aeromarine SprintCat or the Team Believer hull. These will handle well at high speed - something the Chinese cats do not do well - and won't blow over easily. You could use twin 8XLs in them with twin 4S packs and x447s - essentially a light 8S boat, expect mid/high-50s with impressive acceleration. But a single motor setup will be easier and probably faster, although probably not cheaper. I run several different single Neus in mine with speeds from the 50s to the 80s on 4S or 6S.

Bottom line - you will not be happy with an over-powered, ill-handling 30" cat.



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[rcboatfan]

some great info there fluid!!! . i want this cat to be fast like 50 mph so would twin ul-1 combos get me there?? i would be willing to spend the money and get 2 8xl's. i think im going to make it 32'' instead of 30''. so which combo would be better??

[Brushless55]

70mph in a 30" cat is possible!
And some love having way more power than others!

http://www.youtube.com/watch?v=XEjJRiPyEyM

[Fluid]

70mph in a 30" cat is possible!

Yes it is, as I have proven more times than anyone else has with my numerous sub-30" SAW catamaran records - with the right cat is it possible....on smooth water if you know what you're doing. The wrong cat (which most are) will not reach that speed reliably because it has too much lift.

I wasn't refering to a one-time 100-foot long GPS speed reading, but a real, reliable 70+ mph. If all a person is interested in is Internet GPS racing/lying, then I guess it doesn't matter. By all means don't listen to someone who's actually done it officially.



.

[Brushless55]

Ok, we will build what is fun to us...

[G Doggett]

Listen to advice from Fluid.
Contrary to popular belief, it is possible to have too much power.
When I first set up my twin Jolly I used twin Feigao 8XL motors on 4S each and it was almost uncontrollable.
For sure it was damn fast but it spent most of the time in the air even on part throttle.
It might have been fun to watch but was real hard on the nerves.
It now is powered by twin Ammo 2300 motors and I can use full throttle and have a pretty good idea where the boat is going to go.
Most hulls have a designed ( or accidental ) maximum speed, and if you exceed this they are basically out of control.
Graham.

[Brushless55]

Lots of power is lots of fun!