Model Boat Mayhem

Technical, Techniques, Hints, and Tips => BRUSHLESS Motors and Speed Controllers => Topic started by: woodley miniman on May 15, 2013, 07:26:51 am

Title: Brushless motor & esc for Robbe lightening
Post by: woodley miniman on May 15, 2013, 07:26:51 am
HI all, can anyone recommend a brushless motor & esc for a Robbe Lightening? I've recently purchased the boat secondhand and it's not as fast has it could be so I thought I'd go brushless instead of replacing the brushed one. The boat is single hull and 790mm long.
Thank you  :-) 
Title: Re: Brushless motor & esc for Robbe lightening
Post by: Martin (Admin) on May 15, 2013, 10:27:38 am
Robbe Lightning! - Nice hull.   :-))
(http://i.ebayimg.com/t/Robbe-Lightning-46-Radio-Controlled-Boat-/00/s/MTIwMFgxNjAw/z/8nkAAMXQ-KRRiAiQ/$(KGrHqN,!qsFF7v)C6DHBRi!iQzU,Q~~60_58.JPG)
Title: Re: Brushless motor & esc for Robbe lightening
Post by: woodley miniman on May 15, 2013, 11:14:29 am
That's the one!!!!!
 
how about these two????
 
http://www.ebay.co.uk/itm/Water-cool-brushless-100A-ESC-BEC-output-5A-Speed-controller-RC-Boat-new-/321035213151?pt=UK_ToysGames_RadioControlled_JN&hash=item4abf30995f#ht_2935wt_1170 (http://www.ebay.co.uk/itm/Water-cool-brushless-100A-ESC-BEC-output-5A-Speed-controller-RC-Boat-new-/321035213151?pt=UK_ToysGames_RadioControlled_JN&hash=item4abf30995f#ht_2935wt_1170)
 
http://www.ebay.co.uk/itm/330839251274?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649#ht_3222wt_1170 (http://www.ebay.co.uk/itm/330839251274?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649#ht_3222wt_1170)
 
What do you think??? I've got some lipo bats 22.2v 3500 I was thinking of using
Title: Re: Brushless motor & esc for Robbe lightening
Post by: Netleyned on May 15, 2013, 12:04:26 pm
Motor is a nono on 22.2v
Only 14.8V.




Ned
Title: Re: Brushless motor & esc for Robbe lightening
Post by: Martin (Admin) on May 15, 2013, 01:46:46 pm
Motor is a nono on 22.2v
Only 14.8V.

Ned

??? not sure what that means Ned, could you use 'idiots terms' please?   :embarrassed:

Ebay speed controller - "Water cool brushless 100A ESC BEC output 5A Speed controller for RC Boat"
 Just be aware that they are 'Hong Kong Amps'... which are a bit like "dog years!!!"
 ( they may be a little.... "generous" with their specifications!  ok2


Title: Re: Brushless motor & esc for Robbe lightening
Post by: Netleyned on May 15, 2013, 01:51:51 pm
The motor is rated at 14.8v max.
Not advisable to run it on 22.2volts.
No no= negative negative {-) {-)

Ned
Title: Re: Brushless motor & esc for Robbe lightening
Post by: woodley miniman on May 15, 2013, 05:49:18 pm
Ok then.....how about this one


http://www.hobbyking.com/hobbyking/store/__17698__XK4082_1500KV_Brushless_Inrunner.html
[/size]
 :-)
Title: Re: Brushless motor & esc for Robbe lightening
Post by: nick_75au on May 20, 2013, 11:44:04 am
What size prop is on the boat, what voltage do you want to run. they are the questions that really need answering. Basically for a FE boat you wat to keep no load RPM to below 35000 RPM  so 35000/ battery volts will give you an approximate Kv value to look for. the first motor may well be OK on 22 volts with a small prop but I think it my be too small for the lightning.


On an inferred guess though I think a 36 series motor would be better than a 28 series, they have greater torque to spin what I think you might have for a prop.


Example
http://www.ebay.co.uk/itm/Brushless-watercooled-motor-1800kv-3688-2S-to-6S-6volt-22volt-/121111401282?pt=UK_ToysGames_RadioControlled_JN&hash=item1c32cd5342 (http://www.ebay.co.uk/itm/Brushless-watercooled-motor-1800kv-3688-2S-to-6S-6volt-22volt-/121111401282?pt=UK_ToysGames_RadioControlled_JN&hash=item1c32cd5342)


but in a Kv to suit your preferred battery voltage as per the above formula, you can use a lower Kv than the formula calculates if you are happy with less speed with greater runtime but don't go with a higher Kv.


Cheers
Nick