which motor?

[iceman]

my sponsons are a copy of the jae21fe but the tub is wider and deeper. wanted more room for motor and batt. pack

[Fluid]

hehe know that old saying, "go big or go home"

That is really too small of a boat for that kind of Leopard power. I don't mean to be overly harsh, but I just do not understand why newbies think they can re-invent the wheel. The OP has received some very good advice from experienced boaters (and some bad advice from other less-experienced newbies) in this thread - but he refuses to listen. The stock 31" JAE21 runs 55+ with the UL-1 motor and ESC, but the OP changes it around and expects it to run well? Right. That hull underwent a lot of R&D by some of the most experienced R/C racers in the world. But toss all that knowledge out. Change the tub, modify the aoa on the sponsons, use two rear shoes....it isn't the same boat and there is no guarantee it will work well.

But then the OP has probably never seen a good running rigger anyway, so hopefully he will be happy with his boat. He'd be happier if he followed the advice of experienced boaters, but you know that old country boy saying - "you can lead a horse to water but you can't make him drink...."


.

[kievyu]

try 3674 or 4065 size motor kv2500 ~ 3000 for 4s !

What esc depends on what propeller ... if use 437 or 440 propeller just 120a esc ok,

Sorry my English is too bad ...

[iceman]

Fluid, you had suggested the fiegao 8s which is a 540 motor so i was looking alone these lines thinking 540. if i need a smaller motor then thats fine i just want enough power so i dont have to buy thice

[iceman]

Fluid, you had suggested the fiegao 8s which is a 540 motor so i was looking alone these lines thinking 540. if i need a smaller motor then thats fine i just want enough power so i dont have to buy twice.............Would a Leopard 3674 with 2650kv be a better choice? what prop would i start with?

GARY

[siberianhusky]

SO you took JAE21 sized sponsons and stuck them on a 12 sized hull just a bit wider so you say? I'm sorry but I just can't see how you are going to get that set up anywhere near properly regardless of what power you throw at it. You've set yourself quite the task best of luck.BTW don't run a 2500-3000kv 3674 or 4065 motor in this on 4s, that just dumb! If you're bound and determined to run 4s just stick a UL-1 motor in it with a t-120 esc and start out with an x440 prop, the motor will handle a lot more prop but I'm not so sure of the hull design! You'll have the perfect setup to move over to a JAE 21fe then and definitely hit your 55 mph with a different prop.

[wilsta67]

Well if you ever build a similar set up William, post some pics and let us know how it turns out.

lighten up Mike it was a bit of Aussie

[Chilli]

It's all good.

[iceman]

man im confused. went frome the 540 motors to a UL-1 (whatever that is) guess i will figure it all out and get it going sooner or later.

GARY

[martin]

The UL1 motor is out of the Aquacraft UL1 hydro, Its a 3656-2030kv which is a pretty good motor that a lot use ecspecially popular in the JAE 21fe hydro that is 31.5" long.

[iceman]

guess thats the way to go. so i can run this on 4s? do i need a 120 amp esc? X440 prop? so ill be looking for a 440 motor mount then right?
like this one?

GARYadj-mount_small.JPG

[Boaterguy]

a 36 mm motor is 540 sized if i'm right.
a 120A esc might be a little overkill, but still a good choice in case you upgrade.
x440 sounds pretty good, although I've never run one of these motors

[iceman]

what about this combo from OSE?

GARY2030-combo_medium.JPG

[Boaterguy]

looks pretty good, i'm not downplaying the 120A esc at all, in case you ever get wrid of thsi build and hold on to the ESC, but if that is cheaper then i'd say go for it.

[iceman]

so if the UL-1 motor is a 540 then whats the differance in that 540 and a leopard 540 size motor like the 3674?

GARY