Changing to brushless

[Diede van AbsParticipant @diedevanabs87670]

Hi Mike,

I think the text layout was copied over from wherever you copied this link from, that happens sometimes.

Although the batteries aren't that suitable for it (a tad bit too high voltage), I think this motor will get you right where you want to be:
1100Kv motor @ Hobbyking
At 1100Kv it will give you about 13200rpm unloaded @ 12V, which is a bit higher than the 540's from your link, and with 102W per motor these babies should not have even a bit of a hard time pushing your model forward. I have motors of the same series in two tugs and actually have the same motors ready for a fast utility boat with twin screws, these are very lovely motors IMHO. The only drawback is they are mounted "the wrong way around" so you'll have to modify your motor mounts.

This could also be a good choice, being more suited for higher voltages and roughly the same RPM as the 540s:
1000Kv motor @ Hobbyking
I don't know this motor personally though, so the number of windings will be sort of a gamble… I can only say that this series of motors have not disappointed me yet.

Last option for my quick search would be this one:
1100Kv motor @ Hobbyking
This motor is hideously overpowered (which means it will power your boat with so much ease it can read a book while hammering along…) but gives you a motor that is designed for your voltage and the slightly higher RPM's for that bit more performance you were after.

As ESC I can recommend this little baby, although according to the sheet of the second motor a bigger ESC should be used such as this one. For both I recommend buying the Trackstar programming card (only one needed) to program them, it is a lot easier and it has more functions available than transmitter-based (beep-counting) programming.

This ESC should also do fine, although it is watercooled so maybe a little bit of a hassle. Again, order with programming card(although this card seems to be a bit iffy depending on the batch, mine works fine but the reviews suggest issues with a lot of others).

The advantage of HobbyKing are their prices; for the money of one Robbe Roxxy outrunner and ESC here in NL I can buy three, better, outrunners and ESC's, and then some, AND have it shipped here, and still have a bit left to spare…

The disadvantages are a lousy aftersales / guarantee procedure and long transit times (up to 5 weeks) when shipping from Hongkong – although they also have a EU warehouse but that is not as sorted as the Global one.

I would say that is enough food for thought on the late evenings for now Check out the links and try to follow my train of thoughts on them, I think you'll find it pretty obvious if you compare the results with my checklist

Good luck!

[lnvisiblemanParticipant @lnvisibleman]

Cheers Diede

Unfortunately, none of the links work. I'll have a delve and see if I can find the relevant items.

I'm sure I've had dealings with Hobbyking before but I may be wrong !

Mike

[lnvisiblemanParticipant @lnvisibleman]

Ah. They do work but wont open in a new tab. Must be a glitch somewhere. I hate glitches, damned messy buggers and leave so much hair around.

[Dave MilbournParticipant @davemilbourn48782]

Diede
I can't get the second link to work. Can you please put it up again?
Dave M

[Diede van AbsParticipant @diedevanabs87670]

Sure, Dave

As for the links opening in the same window: Sorry, did not notice there were more options to the links. If you right-click them and select "open on new tab" or "open in new window" you should be fine.

I don't seem to be able to edit my previous post anymore…

Edited By Diede van Abs on 17/07/2014 12:22:49

[Dave MilbournParticipant @davemilbourn48782]

Thanks, Diede. You only have the option to edit your posts for a short time after posting – I think it's about 30 minutes. Colin B will add the correct info, I'm sure.
On the subject of brushless motors, I've just taken delivery of the 2822/17 motor and a Hawk ESC with programming card – these on recommendation from Paul Freshney and (indirectly) Dave Abbott. I'm looking forward to playing around with this setup, in conjunction with designing a new model to go with it. Like I said, we experts can't afford to sit on our laurels…………

DM

[Diede van AbsParticipant @diedevanabs87670]

I don't think the 2822/17 will disappoint you, I have a couple of these motors in use and I love them to bits! (and yet they remain in one piece and functioning )

I have one in a tug on 2S LiPo and that is complete and utter overkill – in a little tug of war against a same tug but with standard motor I managed to overturn the other tug in 10 seconds, oopsie….

[Tony HadleyParticipant @tonyhadley]

A new model Dave!

What will it be like? will it be in the magazine or a forum build (along the Bob Abell/Paul T build system)? A guess would be a small MTB type craft, as Dave Abbott's recent builds in the magazine are modified plastic kits.

The suspense is killing.

Tony

[Dave MilbournParticipant @davemilbourn48782]

Not military, Tony. I want to build and prove the model in private rather than have an open discussion with another builder like Paul T does. As for publishing plans well, there's many a slip.
Dave M

[lnvisiblemanParticipant @lnvisibleman]

I have purchased ( I HATE THAT WORD ) a pair of these **LINK**

and two of these **LINK**

and have them fitted ready to try on the water. I also bought ( AAARGH ) a pair of 14.4v 2800mah battery packs to cut the weight down. The props produce almost enough wind to blow the boat off my bench so I'll probably have to downsize the props. Time will tell

Hopefully, I'll try her out on my pond later today and post the results. Somewhere among my bits and bobs I have a speed gun which might be interesting !

Mike

[lnvisiblemanParticipant @lnvisibleman]

The remotored Tintagel has just had her first taste of the wet stuff. OOOPS ! I think I may have overdone it a tad. Take your pick from

1/ rat up a drainpipe

2/ bat out of hell

3/ Sh*t off a shuvell.

She really does move a bit smartish on the old 12v sla battery but with the 14.4 nimh pack, wow ! I need to get her onto a bigger piece of water so I can speed check her.I couldn't open her right up on my pond but still clocked her at 18.6 mph. If she tops 25 mph, I will be well happy.

Mike

[Dave MilbournParticipant @davemilbourn48782]

Madman. I bet your smile was a foot wide.
DM

[Amy jane SeptemberParticipant @amyjaneseptember49770]

Well done Mike

See spending money on things sometimes works. (I shall duely take note)

P.S sorry for swearing!

Good result.

[lnvisiblemanParticipant @lnvisibleman]

Amy J

Go and wash your mouth out !

Some folk can be so offensive Mike

[lnvisiblemanParticipant @lnvisibleman]

In for a penny as they say. ( who are" they" ?)

I've taken a deep breath and ordered a couple of 4s lipos just to see what they are like I want to draw a max of 60 amps so was I right to get 4000Mah 20c items

Mike

[ashley needhamParticipant @ashleyneedham69188]

Mike. You appear to have taken blasphemy to new levels.

Brushless motors and now LiPo`s !! where will it all end??

Ashley

[lnvisiblemanParticipant @lnvisibleman]

Ashley

In tears no doubt !

[lnvisiblemanParticipant @lnvisibleman]

Today I took "Tintagel" to the club water for a proper trial. I am very pleased with the results and clocked her at a top speed of 23.7 mph. Probably get a bit more when the lipos arrive as they give me an extra 2.8 volts over the sla batteries I had in her today.

I must say that I could get to like this brushless mullarky.

Mike

[Bob Abell 2Participant @bobabell2]

Well done……Corporal Mike

Bob

[Dave MilbournParticipant @davemilbourn48782]

I'd take a guess that the present battery is somewhere towards the stern……………..

DM

[lnvisiblemanParticipant @lnvisibleman]

Dave

This will give you some idea of internal layout. Please do not scale ! lol

Mike

[Diede van AbsParticipant @diedevanabs87670]

Hi Mike

Congrats with the successful Brushless conversion. You certainly have enough OOMPH now

Two things:

-Move (one of your) batteries to the front of the boat to get the boat more level on the water, that probably gets your top speed a bit higher and if not then at least it looks better.

-DON'T CHARGE LIPOS ON YOUR STD WALL-WART CHARGER!!! Lipos are great batteries and such, but if abused too badly they turn into dangerous bombs or fire-starters. Using unsuitable chargers is one of the no-no's. So make sure you have a charger capable of (balance-)charging LiPo's and you'll be fine.

[harry smith 1Participant @harrysmith1]

Hi

The replacement size for a 540 motor is 36mm in brushless but the power increase is insane.

For a 36" boat about 800-1200watts total but over that your cruiser would turn into a speed boat.

Look motors and ESC's which will match so changing the battery from 3S to 4S will increase revs.

About 750watts equals 1HP.

Hobbyking has a good range of motors.

Running brushless motors in a two motor setup.

Requirements

2 ESC's

Mixer(Turnigy v tail) links the 2 motors to one channel.

Battery 5800mah high C to run the two motors(about 45 minutes run time).

If you wish to go CLARKSON two B36-50-07S 5000KV 1100watts on 3S well give you 55,500rpm 0n 3S(11.1 volts)!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Run time about 5 minutes with one scared driver!!!!!!

[harry smith 1Participant @harrysmith1]

If you are going brushless motors in that size and type of boat going over 1000watts total between the two motors will turn it into a speed boat.

Also the two ESC's can only be linked together will a mixer(e.g. Turnigy TR-V-TAIL).

Sample

My 2ft 10" deep vee 3639-1100kv,800watts,3S battery(12,210 rpm) 5800mah 40mm x 1.4 pitch prop( nice quick boat).

Changed the motor only to a 3648-1450kv 1600watts(16,095 rpm) sit on the prop in a straight line.

Also halved the run time.

[harry smith 1Participant @harrysmith1]

We have a 40" cruiser with two 35mm motor (bolts straight in place of the 540 motors) these are 3639-750kv 600watt (8325rpm) on one 3S (11.1 volts) 5800mah 3S 60C battery.

ESC's are Hobbyking car ones with reverse(code HK-60A)(with electric fan on top, no plumbing).

These are linked together with a Y connector back to the receiver.

Props 45mm x 1.4 pitch.

Speed is a bit fast but at 80% throttle a better scale speed.

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