Ultra fast electric options

[hyrulejedi86]

I really like the aeromarine sprintcat. Rumdog, yours is awesome. It looks like it handles very well and has a great speed!
Is it necessary to use the dual motors to get to those speeds and handling or would it be possible to do it with one motor? Do you have any pics of the inside and the hardware?

As for motors I also like the arcs alot but like I said I couldn't find any info on the specs and limits of them.

The JAE outrigger is also really nice but I had messed with an outrigger before and their lack of space kind of drove me nuts.

The FE 30 is pretty sweet looking also!

[Rumdog]

It will handle just as good with one motor. Mine was a little better in bigger chop with a single 1527 on 5s2p. 62 mph I think with the single setup. Here ya go, with a single: http://www.youtube.com/watch?v=TqTIEOKMnTA

[Rich]

Rum you always throw a wrench in what I want to build this winter, Nice twin!

[oscarel]

Awesome cat!

[hyrulejedi86]

I agree the cat looks totally amazing but I gotta ask. I looked up that motor and it is a BEAST It said it's constant wattage was 2250 watts (on 5s ~121A) and 4500 watt burst (on 5s~243A) Does it generally reach those wattages? How hot does it run not on almost frozen water?

I also was wondering just because I still haven't figured it out what difference does the 5s2p make compared to using 5s?

[Rumdog]

2p will give twice the capacity and allow the motor to draw twice the amount of amps . 30c x 5000 mah equals 150 amps continuous. 30c x 10000 mah equals 300 amps continuous. With a big enough prop, yes it will deliver that wattage. I ran it with a x 455 for mid sixties. It ran warm. Not hot, but needed every bit of the CC LV 240. It was a reliable setup in any water temp. The build was finished mid winter, hence the COLD vid.
A 15271y will pull less amps and be a 60 mph boat on 6s2p as well.
Even if you're not pulling said amps, the packs will supply the motor/esc with more efficient voltage when running 2p.

[supafastsupra2]

What's a good alternative to the 1527 (cheaper)? for 6s2p on the the sprint cat .40? Looking for 60-65mph in gasser chop

[hyrulejedi86]

I get it, So do you run 2 x 5s 5Ah packs in parellel in the hull then?

The aeromarine site doesn't give alot of details about their hulls so I was wondering also, where did you get the hardware to put on the boat and is it fiberglass? How heavy?

[Rumdog]

Yes fiberglass.
I have the "heavy" nitro layup. You'll want that option if you're gonna be running 60 plus for sure. It has 4" rails for the motor mount.
Yes 2 5s 30c 5000 mah packs is what I ran.
Speedmaster Hardware from OSE.
.187 flex.
It is a big hull for 34.5"

Supra, the Neu/Castle 1717 may get you 60 mph, or close to it on 6s2p. You could try some of the big outrunners also.

[hyrulejedi86]

Would this do well at all on that boat, the neu 1521/1.5D 1860Kv, running 4-6s? Too weak?

Do you have a weight comparison perhaps to the UL-1?

[supafastsupra2]

Would this do well at all on that boat, the neu 1521/1.5D 1860Kv, running 4-6s? Too weak?

Do you have a weight comparison perhaps to the UL-1?

It's probably better to run a WYE (Y) wind motor rather than a Delta (D) wind. D wind motors are amp hogs. I also heard the 1717 is an amp hog according to the guys on rc-monster.

Any suggestions on a specific outrunner? What about a Leopard 5692?

[hyrulejedi86]

I see, are they wound differently or is it just wound so that they have lower kV? I kinda wanted the slightly higher kV to get up there in speed.

[supafastsupra2]

I see, are they wound differently or is it just wound so that they have lower kV? I kinda wanted the slightly higher kV to get up there in speed.

D winds are terminated differently to a Y which results in a given D wind having 1.7 times the RPM and less torque of a given Y wind (i.e. a 1521 1D and 1521 1D).


Left is delta terminated and right is wye


Borrowed from Wiki:

There are also two electrical configurations having to do with how the wires from the windings are connected to each other (not their physical shape or location). The delta configuration connects the three windings to each other (series circuits) in a triangle-like circuit, and power is applied at each of the connections. The wye ("Y"-shaped) configuration, sometimes called a star winding, connects all of the windings to a central point (parallel circuits) and power is applied to the remaining end of each winding.
A motor with windings in delta configuration gives low torque at low rpm, but can give higher top rpm. Wye configuration gives high torque at low rpm, but not as high top rpm. [1]
Although efficiency is greatly affected by the motor's construction, the wye winding is normally more efficient. In delta-connected windings, half voltage is applied across the windings adjacent to the undriven lead (compared to the winding directly between the driven leads), increasing resistive losses. In addition, windings can allow high-frequency parasitic electrical currents to circulate entirely within the motor. A wye-connected winding does not contain a closed loop in which parasitic currents can flow, preventing such losses.
From a controller standpoint, the two styles of windings are treated exactly the same, although some less expensive controllers are designed to read voltage from the common center of the wye winding.

[oscarel]

What's a good alternative to the 1527 (cheaper)? for 6s2p on the the sprint cat .40? Looking for 60-65mph in gasser chop

Here's an alternative, but would probably have to go at least 8s2p. I've got one of the smaller 700-68 motors that I've run on 8s1p and it's held up pretty well. I don't see these much here, but they are used for r/c jets. I believe they are also the same size as the Neu.

http://shop.turbofanelectrics.com/product.sc?productId=252&categoryId=33

[supafastsupra2]

I'd like to stay 6s due to the high cost of an HV setup. I have a CC 110hv but am not sure if i could use this reliably with anything? Maybe a low kv outrunner on 12s?