Largest Motor/ESC Combo In JAE Mini Sprint

[cjs]

I am looking to find out what the largest physical motor and ESC has been fit inside of a Mini Sprint. I have read a few different places/posts about selecting ESCs to fit when running 3S and how it can be tight. I have a 2845 that I would like to run on 3S, but don't know if it is possible.

Any info and photos of Mini Sprints with electronics installed is appreciated.

Thanks,
Chris

[NativePaul]

A 28/29mm diameter 45mm long motor is the largest that will fit in the stock position without any mods to the hatch, if you make a bubble canopy or move the motor mount back when building you could fit more in.

I run Castle Ice Lite 50 with extra caps in mine at the moment, but I have tried an Ice Lite 100 for size and it fits too, much bigger than that and it would severely limit your LiPo selection.

If you planned out the servo, ESC, battery and RX placements, I think you could probably fit a 120A watercooled ESC and 3000mAh LiPo in it. If you want to work it out the space available between the transom and the boom tube is 206mm long, 54mm wide and 32mm high, but the lip is only 39mm wide, so if you want to get extreme smome may have to be built in. The stuffing tube encroaches in this space starting to come up through the floor about half way down and rising to about 11mm. The middle of the hatch angles up from about 30mm forward of the transom and rises to give 9mm extra space over the centre 28mm by the boom tube, there is plenty of space in front of even the longest motors for a RX, but most suitable servos will need an extension lead to reach that far forward. There is room for the servo up front too, if you want to think outside the box with a 350mm+ linkage. If you do take the time to find the most capable parts that can be shoehorned in post the combo and where it goes as I am sure many will want to know.

[cjs]

Thanks for the reply Paul! Do you have photos of yours?

I may just buy the kit and figure out what I have that will fit in it.

[NativePaul]

I have a few photos




This is with 28x36 motor, 50A ESC and 1100mAh LiPo (not really enough LiPo)

[cjs]

That is very impressive! Do you have a photo with the hatch removed?

[NativePaul]

No, but I can take one tomorrow.

[NativePaul]

Here you go.

[SweetAccord]

Here is mine. It's not as pretty as Paul's though. http://forums.offshoreelectrics.com/...p?albumid=1346

[NativePaul]

I would have to disagree, that has to be the neatest interior I have ever seen, and I would bet that your 3 bearing prop stub will have less wobble than my stock no bearing stub has after 4 years.

[SweetAccord]

I would have to disagree, that has to be the neatest interior I have ever seen, and I would bet that your 3 bearing prop stub will have less wobble than my stock no bearing stub has after 4 years.

Thank you Paul. I'm very picky and everything I do reflects it. You can do bearings in the strut also, it's super easy to do. I'm sure you know how to do it, why don't you?

[NativePaul]

I wanted to see if it would work, to start off with, and it did, better than I imagined for the first 2 seasons, by the third it wasn't ideal but not bad enough to bother with and I have not been very active this season and it will not be the boat I am using next season.

[kacordy]

Heys guys, thank you for sharing the photos. This is the first time I have ever seen motors all the way to the front of the tub? I'm shocked that the CG works ok with the battery so far back behind the rear after plane of the front sponsons. It must be ok because your carrying some of the battery weight on the rear ski? I'm sure you could not run this configuration without the rear ski?

Allen

[cjs]

Paul, what ESC is that and what is the CoG supposed to be on these riggers?

[cjs]

SweetAccord, that is a sweet looking setup! Is it common to jot run water cooling on these riggers? I don't see Paul's hooked up either.

Is mounting these motors so far forward a custom setup? I think the original Mini Sprint that I ran had the motor mount as a bulkhead located more to the rear...

-Chris

[SweetAccord]

SweetAccord, that is a sweet looking setup! Is it common to jot run water cooling on these riggers? I don't see Paul's hooked up either.

Is mounting these motors so far forward a custom setup? I think the original Mini Sprint that I ran had the motor mount as a bulkhead located more to the rear...

-Chris

Thank you. The original design by JAE called for a 50A ESC with no water cooling but I'm using a 60A ESC so it will not need watercooling. It's not worth adding either as there's not a lot of room in the hull and the run times are not long enough to benefit from it. In additon, I don't wish to add additional unecessary weight, but sure you can always add it if so desired. I have two of these riggers, and the first one I built does not have water cooling either and it runs a 50A ESC with a 30mm prop with a 3500 KV Outrunner 2223 5 Turn and the whole system hardly gets warm.

Actually, if you look again at Paul's pic's his first post, it has water cooling but he apparently removed it later. I'm sure he can tell you why.

No, these are not custom setups for the motor location, these are stock motor locations as designed by JAE. I'm not familiar with any other version of the JAE Mini Sprint other than the one originally released by zippkits.com, so maybe you have some other type or design or if you bought it second hand it may have been modified previously? Have any pics?