How to pick the right FE motor

[rumrunner]

With the castle/ neu motors (1521) what s the right option to get for a tunnel , also what size shaft 5mm or 8mm , do you pick the most kvs ? Because on offshore electric theres custom winds

1D 2900Kv 5mm Shaft (+$45.00) (

1.5D 1860Kv 5mm Shaft (-$45.00) (0)

1Y 1577Kv 5mm Shaft (-$45.00) (1)

1.5Y 1050Kv 5mm Shaft (-$45.00) (2)

1D 2900Kv 8mm Shaft (2)

1.5D 1860Kv 8mm Shaft (-$45.00) (1)

.5Y 3100Kv 8mm Shaft (3). -------------------- so would this be the best or the 1d 2900kv 5mm shaft

1Y 1577Kv 8mm Shaft (-$45.00) (4)

1.5Y 1050Kv 8mm Shaft (-$45.00) (1)

 

[ron upton]

what size lipo are u going to use

 

[rumrunner]

6s lipo its for a q tunnel.

 

[Kris Flynn]

You will NOT be disappointed with the 1y Shane...but get the next kv up while your at it to save on postage ;-)

Hurry up, you have 14 weeks till the HSC

 

[Kris Flynn]

Oh and go the 5mm shaft

 

[rumrunner]

Thanks kris

 

[HTV Boats]

Shane,

For outboards a 5mm shaft is user for the standard motor to flex shaft adapter made by Hyperformance or Kris? An 8mm shaft comes into play for larger (longer) motors where high RPM's could flex a rotor a bit.

As for KV's just multiply by total cell voltage and you get unloaded RPM. Loaded or actual RPM will be about 15% less. So a Q at 22.2v and a 1600kv motor - 22,2 X 1600 = 35200 rpm. Which will be between 29000 and 31000 at the prop. If you target 30000-38000 rpm for heat racing your in the correct range. For SAW we go 40000-50000 unloaded'

A 1600kv works out well for a light Q tunnel. Going down to say 1250kv you could use large props but extra diameter might take a little more battery draw.

Mic

 

[rumrunner]

Thanks mic

 

[rumrunner]

Mic have you ever tried to heat race bigger motors ? If so how much battery did you have to use 2 4000 or bigger?

What motor was jay using when he raced Jr ?

 

[HTV Boats]

Shane,

Jay ran and still is running a Castle 1520 1Y 1600kv. Its a bit faster now on the Vision over my hull that we couldn't tame in corners when he ran Jr. As for more motor I have a 1527 1Y/1250kv that we run on 8S. Uses 3000ma in 2 SAW passes when we can keep it on the water. Not worth a **** for heat racing without going to a 40-45" hull and carrying 8-10000 ma's of weight.

Mic

 

[rumrunner]

Thanks

 

[rumrunner]

What do the letters at the end mean ? D or y

 

[RonShaw]

Shane,

The D and Y stand for the type of winding used inside of the motor. Look at this explanation on OSE below. It covers this very well. The very first sentence is the one that you want to focus on. The rest is for the techies!!!...

OSE..."A motor with windings in delta configuration gives low torque at low rpm, but can give higher top rpm. Wye "Y" configuration gives high torque at low rpm, but not as high top rpm.
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."

 

[rumrunner]

Thanks think that helped lol . For tunnels d would be better y ?

 

[Kris Flynn]

I honestly dont think it makes a huge diffenrece with Y or D Shane

just get a good KV (1600ish) and you are good to go...you could almost use you 45 nitro props...but the 1300odd KV motor will definitely allow you to use your 45 nitro props!!!

 

[rumrunner]

What about 2900kvs

 

[Kris Flynn]

Haha try it and let me know how long the motor lasts ;-)

Sweet motor on 4s ;-)