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
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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 :-)
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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)
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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
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Motor is a nono on 22.2v
Only 14.8V.
Ned
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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
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The motor is rated at 14.8v max.
Not advisable to run it on 22.2volts.
No no= negative negative {-) {-)
Ned
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Ok then.....how about this one
http://www.hobbyking.com/hobbyking/store/__17698__XK4082_1500KV_Brushless_Inrunner.html
[/size]
:-)
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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