Brushless Motors - power

[wayne frey]

While lurking around in a hobbie shop the other day, I overheard one of the guys there talking about brushless motors.A few minutes ago, I was looking at the Multiplex site and saw a link to them.Clicking there, I read they claim to have up to 3 times the power output.
I also seem to remember overhearing one gets longer run times from a brushless motor also.
Kind of odd I have not seen any mention of it on this site.
Sure would like to see some feedback on the advantages and disadvantages(if any) of using these motors. If they are more powerful,can someone give a conversion rule as far as comparison to a,say standard pittman 500.Like is a 400 brushless got more beans than a 500 pitman, or 600 brushless have the punch of a 900 pittman,etc..Of course,longer run times would be benifical also. If the only disadvantage is initail cost, I would do that.
Lets hear from you guys!

[novagator]

I was talking to a

I was talking to a guy at the hobby shop about this for a brushless motor for a a piclo helicopter. The motor with brushes $10. Brushless $250.



Take out the brushes and the cost goes through the roof. The only resistant in a brushless motor is the bearings. You get a lot more power and longer run time as well. But an extra battery is much cheaper.

[bo@ti]

Also recuired a special speed-control.

http://www.finedesignrc.com/

Also recuired a special speed-control.

http://www.finedesignrc.com/

[Guest]

Hi bo@ti,

I wonder do you

Hi bo@ti,

I wonder do you want your sub running 120mph under water with these BL motor? just kidding....

[bigdave]

Good morning, Well at least

Good morning, Well at least it is for me. Morning anyway. I feel brushless motors are the wave of the future in the R/C world. I use them in my R/C helicopters and love them. I don't think they have a place in the model sub world as yet. It is kind of overkill. Plus the main thing we are looking for is more time in (or under) the water. Although they are very powerful and efficient they also burn up a lot of amps. Which would make a very fast short duration submarine. Plus I do not believe there ESC's out there yet that have reverse capability. A thing we kind of need. Just my opinion, Dave.

[Guest]

Dave,
For sure, there were several

Dave,
For sure, there were several ESC for BL motor did have reverse function from Hacker, kontronik... etc

707HK

[scott t]

Motors from computer drives are

Motors from computer drives are brushless and free from some old computer. Figuring out the controler is the tricky part.
Forward, reverse, fast, slow. No gear reduction.
Here is a site for converting them to a robot.Floppy the Robot
Who will be the first to convert them to a submarine?
If I was the inventor type I would have come up with something already.

Hope this gets some of you more ambitious types digging into this idea.

Scott

[bigdave]

Thats cool! I will have

Thats cool! I will have to check that out. I know the motors will run in either direction. But I did not know anyone had a ESC that you could do it from the radio. Thanks, Dave.

[Guest]

Hmm.... That will be the

Hmm.... That will be the problem because all BL motor require 3 wires which mean you got to get a BL type ESC.

I did have 2 BL motor and ESC. Both installed in FE boat. Few months ago, I also damaged 1 ESC after the boat sink and cost me alot (Include buying a new one, I can get a Seawolf hull from Thor with this cost!)

Dave, for running both direction, you got to get a ESC which have revrse funchion. for detail, check up here: http://www.schulze-elektronik-gmbh.de/index_uk.htm
and click 3.2 for car, then you can see the ESC with revrse funchion.

707HK

707hk

[bigdave]

??? WOOH! That is one

??? WOOH! That is one expensive ESC. Talk about sticker shock! Dave.

[Guest]

BINGO~~~! http://www.subcommittee.com/forum/icon_razz.gif as I said,

BINGO~~~! as I said, youcan buy a new hull which it but just play for 10 to 15 mins maxium running time.....

[captain nemo12]

I have two of these

I have two of these motors and they are really working well, I use mine on standard 9v power but testings proved that less power could be usable too. I have one on my Nautilus and am incorporating the other one on the Alfa.

[petn7]

luckily this hobby doesn't suffer

luckily this hobby doesn't suffer from 4 min run times like micro helicopters used to before BL motors and lithium batteries.

[marco]

A merit of brushless is

A merit of brushless is just the absence of brushes that cause high frequency noise. this allow you to eliminate anti-disturb filters. Besides brushless motors dosen't need maintenance (brushes substitution).
Bye

Marco

[petn7]

you forgot to mention the

you forgot to mention the most imporant difference - increased power