Topic: 12v motor MMM brackengarth (Read 2190 times)

Kim · « **Reply #35 on:** May 15, 2012, 05:05:34 PM »

I love Mayhem .. i really do...

You can get pulled up for spelling & grammer, pulled up for double posting ... You can get people arguing with adverts (despite the advert being subject to UK law) get a million and one opinions but when your looking for help .... well best of luck to you!

Here is a link to a prop calculator for full size boats - Please bear in mind its from 1:1 scale but may give you a guide on how to calculate preferred motor output etc... http://vicprop.com/displacement_size.php

Problems come when predicting slip, wind & wave height in the model world .... thats assuming we can get down to that need for accuracy... our first problem seems to be even agreeing a ball park figure for rpm ... did we even consider pitch ...
enough from me & best of luck to you!
Kim

john s 2 · « **Reply #36 on:** May 15, 2012, 06:49:39 PM »

I have a pair of 12v T 12 motors in my lifeboat. They are ok but in my opinion overhyped. The run time is not particuly good. I feel the price is not worth it.John.

tugnut · « **Reply #37 on:** May 15, 2012, 08:37:53 PM »

Hi John i have a car fan motor in my Hollygarth she tows realy well also running the 100 nozle.

regards John B

john s 2 · « **Reply #38 on:** May 15, 2012, 08:43:53 PM »

Car fans do seem to work well. From what i can see they are efficient and good value. I we certainly be trying them later this year. John.

Unrecognisable Andy · « **Reply #39 on:** May 15, 2012, 10:18:30 PM »

Why go out and spend upwards of £400 on a kit, hours to build it, hundreds of pounds worth of electronics and radio then go pull a crappy motor out of a clapped out Nova to power it? It seriously beggars belief.

RAAArtyGunner · « **Reply #40 on:** May 15, 2012, 11:20:49 PM »

Andyn,

I suppose because those crappy motors are cheap, (I may not have enough left after forking out for the kit for another 400 for the electrics etc), readily available and outperform what suitable motors may be readily available, if there are any.

Don't know about your cars but our 'car' motors, fans, aerials, seats, mirrors, windows, etc are good quality and indeed some are branded Mabuchi.

Not to mention power tools with gearing, makes the budget go further.

Tug Fanatic · « **Reply #41 on:** May 15, 2012, 11:32:35 PM »

If you look on ebay you will find new fan motors at below 720BB or 900 prices prices. The fan motors are designed to run for thousands of hours and will turn a big prop all day and barely get warm.

I have never had a car heater/ cooling motor fail to deliver. They are silly prices for the quality & power. As an example just look at this new motor. This not an advert & I have absolutely no connection with the seller - it is just an illustration of what is available if you look. The motor comes out of the middle of the fan. Check the size of what you are buying as some can be quite large.

http://www.ebay.co.uk/itm/Genuine-Vauxhall-Cooling-Fan-Motor-Astra-F-Calibra-Corsa-B-Tigra-Cavalier-New-/190640068258?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2c630896a2

nick_75au · « **Reply #42 on:** May 16, 2012, 09:23:12 AM »

Quote from: Andyn on May 11, 2012, 11:12:58 PM

Exactly what he said. But without the spelling mistakes

There would be thousands of blower and fan motors powering model boats, I know of a few in our club that are in boats 20 years old, and that's after the service they provided in the donor vehicle

Nick

Tug Fanatic · « **Reply #43 on:** May 16, 2012, 09:59:37 AM »

Quote from: nick_75au on May 16, 2012, 09:23:12 AM

There would be thousands of blower and fan motors powering model boats, I know of a few in our club that are in boats 20 years old, and that's after the service they provided in the donor vehicle

Nick

Absolutely. I still own a couple of models that are 20 years old & have motors that I freed from the scrap yard crusher. Most of the motors were open so you could see the condition of those lovely big brushes & bearings before purchasing them. 20 years on & they really haven't changed or worn at all. Unfortunately, as I posted in the "brushed motor" section scrap yards here don't seem to welcome visitors any more. I can buy a new one for less than they value their time at to remove a used one for me. £25 used or rather less new is I am afraid a no contest.

£20 for a new blower or fan motor makes most model motors look incredibly overpriced and undesirable if you are building a model that can use one. I can't understand why you would spend £400 on a model that took 500+ hours to build & then fit a poor quality model motor if you have the choice of a good quality industrial motor instead.

Free choice reigns.

Subculture · « **Reply #44 on:** May 16, 2012, 11:17:45 AM »

Most industrial electric motors are designed for lifespans of 60-70 thousand hours of use. As most models are luck to get a couple of hours use a week, they should comfortably outlast the owner!

For a 100mm prop depending on pitch you want 1500-2500 RPM. If you assume 25 per cent slip use the following formula to calculate speed in MPH-

Pitch(in inches) x RPM / 1408

So in this case if we assume 1:1 pitch and take a median RPM- 4 x 2000/1408= 5.68 mph

tt1 · « **Reply #45 on:** May 16, 2012, 04:11:49 PM »

Tyne models recommend car blower motors for use with their tug kits - obviously for sound reasoning I would of thought.

tugmad · « **Reply #46 on:** May 16, 2012, 04:31:50 PM »

Vauxhall Astra mk 11 cooling fan motors perfect job.

Kim · « **Reply #47 on:** May 20, 2012, 09:04:28 PM »

Quote from: john s 2 on May 15, 2012, 06:49:39 PM

They are ok but in my opinion overhyped. The run time is not particuly good. I feel the price is not worth it.John.

Run time ... Is that not dictated by the battery amps?

Like i say best of luck!
Regards
kim

john s 2 · « **Reply #48 on:** May 20, 2012, 10:33:08 PM »

Run time is varyed by many things. A battery is a storage device. It is how the power is used which effects run time. Motor efficiency. Generally the more poles the better. Brushless are more efficient. Revs, hull drag, prop choice etc and the big variable how fast we run the boat. There are also losses in the speed controller etc. So throw this lot in and run tine becomes a difficult thing to work out exactly. Watching and talking to the lads at your local pond gives a good idea of things. John.

Kim · « **Reply #49 on:** May 20, 2012, 11:19:07 PM »

Quote from: john s 2 on May 20, 2012, 10:33:08 PM

Run time is varyed by many things. A battery is a storage device. It is how the power is used which effects run time. Motor efficiency. Generally the more poles the better. Brushless are more efficient. Revs, hull drag, prop choice etc and the big variable how fast we run the boat. There are also losses in the speed controller etc. So throw this lot in and run tine becomes a difficult thing to work out exactly. Watching and talking to the lads at your local pond gives a good idea of things. John.

I'm no ellectrician .. but .. If a motor draws... lets say for easy maths ....1Amp and you have a 5 amp battery then the max you are going to get is ....... Drum rolll ...... 5 hours ... seems simple to me.
Regards,
Kim

Unrecognisable Andy · « **Reply #50 on:** May 20, 2012, 11:22:41 PM »

This is why you need to put what trader you represent in your name....

Kim · « **Reply #51 on:** May 20, 2012, 11:31:00 PM »

Quote from: Andyn on May 20, 2012, 11:22:41 PM

This is why you need to put what trader you represent in your name....

Andy, I confused.. I'm Kim From Clyde Model Boats... I think i said that before on this thread?
Whereas you just changed your mind .. forgive me if i have missed something,,,,
Regards,
Kim

Unrecognisable Andy · « **Reply #52 on:** May 20, 2012, 11:36:17 PM »

I know you are, a select handful of people on here know you are... John obviously doesn't, and as previously said a few times on here by different people going simply by the name Kim doesn't give any indication as to who you actually are...

Doesn't bother me, just an observation

Kim · « **Reply #53 on:** May 20, 2012, 11:47:25 PM »

Andy,
My Name, Password and re instated standing on this forum is all down to Martin not me!
This all came about after batteling my side on a rather one sided ? Truth makes a boring story incident ...
If your interested...
http://www.modelboatmayhem.co.uk/forum/index.php?topic=35826.0

Unrecognisable Andy · « **Reply #54 on:** May 20, 2012, 11:52:07 PM »

It's all alterable by yourself, in the account options section of your profile...

Again, merely a friendly observation nothing else

john s 2 · « **Reply #55 on:** May 21, 2012, 12:15:53 AM »

Kim you are correct that current draw is run time. I think i misinterperated your post. What i was saying that run time can be affected by various factors. Sorry . John.

Kim · « **Reply #56 on:** May 21, 2012, 12:29:24 AM »

John, No problems!
Regards,
Kim

Kim · « **Reply #57 on:** May 21, 2012, 12:59:03 AM »

Quote from: Andyn on May 20, 2012, 11:36:17 PM

I and as previously said a few times on here by different people going simply by the name Kim doesn't give any indication as to who you actually are...

Doesn't bother me, just an observation

Andy, substantiate your claim and i will rectify!
Regards,
Kim.

RAAArtyGunner · « **Reply #58 on:** May 21, 2012, 01:45:13 AM »

Quote from: Kim on May 21, 2012, 12:59:03 AM

Andy, substantiate your claim and i will rectify!
Regards,
Kim.

Kim and Andy,

This is a world wide forum and as you will see I and several others are from OZ.

We don't beat around the bush and a spade is a spade. What I am saying is from my perspective it helps me to know that if you both are a manufacturer/supplier/intelligent /whatever, when reading your posts as you may obviously have experience which is beneficial.
When the debate centres on opinions and points of view then I will weigh up the pros and cons, but in general matters, it is prudent to heed words of wisdom.

So who are you????????????????????

Kim · « **Reply #59 on:** May 23, 2012, 12:01:56 AM »

Quote from: raaartygunner on May 21, 2012, 01:45:13 AM

Kim and Andy,

This is a world wide forum and as you will see I and several others are from OZ.

We don't beat around the bush and a spade is a spade. What I am saying is from my perspective it helps me to know that if you both are a manufacturer/supplier/intelligent /whatever, when reading your posts as you may obviously have experience which is beneficial.
When the debate centres on opinions and points of view then I will weigh up the pros and cons, but in general matters, it is prudent to heed words of wisdom.

So who are you????????????????????

My Name is Kim... I like Model boats ... I like them so much I turned a hobby to a income ... I hope the group will help support me & help me recover to a normal state of being!..

Kim

Welcome to Clyde Model boats .. Today's technology. Yesterday's History ...
Damn there i go again... l

RAAArtyGunner · « **Reply #60 on:** May 23, 2012, 10:50:56 AM »

Hi Kim,

Thank you.

Haven't checked, but take it that you have a website, also are you listed in Mayhems trader directory.

ACTion · « **Reply #61 on:** May 23, 2012, 02:19:52 PM »

Quote from: ADIJohn65 on May 11, 2012, 08:24:47 PM

Looks like i will be ordering a MMM T12 or T24 motor would you all think a action electronics set up will work well with this motor?

Regards John.

Yes!
DM

RAAArtyGunner · « **Reply #62 on:** May 23, 2012, 10:40:08 PM »

Quote from: ACTion on May 23, 2012, 02:19:52 PM

Yes!
DM

Are you sure

portside II · « **Reply #63 on:** May 23, 2012, 11:26:24 PM »

Right here is my two penneth (prob spelt incorrect).
but i have a brakengarth and have for some years now , it's one of Brian's prototypes , a one off and has a 90mm prop in a steerable kort .
When i built mine Brian was still supplying the old motors , big black thing's which i believe were also used to power compressors in refrigeration units when running of batterys ,
I may have it wrong but that's what i believe . Now this thing is powered by 2 12v 12ah batterys through an electronize FR30 esc .
So that's my setup in the brakengarth , if you can get hold of one of these motors then do so the run time is , well i have never flattened mine.
But as an alternative i have made a tug with a 90mm prop and kort set-up running on 24v with an ACtion esc and one of those 6-36v motors , the ones from kids scooters.
I have a pic showing the motor fitted but as it's in the bottom of the hull it's not that clear.

I ran this motor off two 12v 7ah batterys and whilst doing a bollard pull i managed to rip the coupling from the motor /shaft , now this was made from fuel pipe the braided type .
Yes there are better motors out there , but for the price these are up there for value as i paid a tenner for mine

.
daz

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Author Topic: 12v motor MMM brackengarth (Read 2190 times)

ACTion