HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Feb 04, 2005, 10:05 PM
in persuit of low wing loading
Gordon Johnson's Avatar
Boston, Mass
Joined May 2001
6,426 Posts
Micro Brushless Motor Test Results

The past several weeks or more I've been testing the almost available commercial micro BL motors. These are the Gary Jones MiniDisc BL sold by BSDmicroRC.com, which weighs 7.7g complete with wires and plugs and the integrated motor mount. The Mighty Midget family of outrunners by Uttam and his father, which weigh 3.5g, and 5.9g for an upcoming longer version of the motor. And, the RS-Motoren 11g LRK (14g for the prop saver version I tested.

I have not had time to put these up on my web site yet. But, here they are. The complete article will be in the March RCMF.

Gordon
Gordon Johnson is offline Find More Posts by Gordon Johnson
Last edited by Gordon Johnson; Feb 22, 2005 at 07:43 AM.
Reply With Quote
Sign up now
to remove ads between posts
Old Feb 04, 2005, 11:24 PM
Time wounds all heels.
Phoenix, AZ
Joined Jul 2001
832 Posts
wow.

These are going to open up a whole new ballgame.

I have on my desk a beautiful Matchbox collectable P-51, 6" ws. Everytime I look at it I want it to fly. Within 2 years I bet it can.

http://www.matchboxtoys.com/us/image...7473_00_lg.jpg
watersharer is offline Find More Posts by watersharer
Reply With Quote
Old Feb 05, 2005, 06:39 PM
Team30 Micro EDF
NitroCharged's Avatar
Adelaide, Australia
Joined Apr 2004
11,191 Posts
You lucky guy, Gordon - oh the joy of being able to play with these before they are on the market

Uttam has really teased us for a while now on the release of his Mighty Midget. I can't wait!
NitroCharged is offline Find More Posts by NitroCharged
Reply With Quote
Old Feb 05, 2005, 07:53 PM
To many projects
66tbird's Avatar
USA, AZ, Litchfield Park
Joined Aug 2004
1,055 Posts
Thanks, I know I've had a spot open on my workbench for months now while waiting on the MiniDisk BL. Just have to the chin up and wait for any bugs to be worked out I guess.
66tbird is offline Find More Posts by 66tbird
Reply With Quote
Old Feb 05, 2005, 08:24 PM
in persuit of low wing loading
Gordon Johnson's Avatar
Boston, Mass
Joined May 2001
6,426 Posts
Well, with these results you can begin planning planes to use these. I'll post more details in the next few days when I get a chance.

Gordon
Gordon Johnson is offline Find More Posts by Gordon Johnson
Reply With Quote
Old Feb 05, 2005, 09:50 PM
Registered User
NYC, NY
Joined Jan 2005
125 Posts
Sorry for being late to the party on this, but from reading around; none of these are market ready yet? Is there an ETA? These would solve my weight/thrust problem on my pitts.
WarpdSpazm is offline Find More Posts by WarpdSpazm
Reply With Quote
Old Feb 05, 2005, 10:26 PM
del
Registered User
del's Avatar
north of Chicago
Joined Feb 2003
1,827 Posts
Fun for the future? Most likely.
Thrust to weight ratio? Looks good...
But efficiency?

Compared to other motors in Gordon's reports, no so good.
What's with that?
--del
del is offline Find More Posts by del
Last edited by Gordon Johnson; Feb 07, 2005 at 03:41 PM.
Reply With Quote
Old Feb 06, 2005, 02:30 PM
in persuit of low wing loading
Gordon Johnson's Avatar
Boston, Mass
Joined May 2001
6,426 Posts
Del,

If it is efficiency you are after in motors this small then outrunners are probably not the answer. I don't know if this is due to outrunners this small having lower efficiencies, or that motors developed by individuals don't have the resources of, say, Mabuchi. Probably it is due to being more concerned with obtaining power than efficiency.

However, the theoretical max efficiency when the motor is running at max power rpm is 50%. When looking at this figure rather than the max efficiency figure these motors don't look too bad. It's different for duration planes. But, I told Bob Wilder micro outrunners were not the direction I would suggest going for duration planes. These motors are best for taking more amps or more volts than comparably sized micro brushed motors can. And, there is the alure of quiet no-gearbox flight.

Gordon
Gordon Johnson is offline Find More Posts by Gordon Johnson
Last edited by Gordon Johnson; Feb 07, 2005 at 03:41 PM.
Reply With Quote
Old Feb 06, 2005, 08:37 PM
Registered User
NYC, NY
Joined Jan 2005
125 Posts
Gordon,

As Im new to micro flight... well E-flight in general, I've never really taken eff. into consideration. I'm assuming by duration flying you mean contest level? At our gym, we only get 2-5 minute openings at a time to fly RC (got to give way for the rubber guys). Is it safe to say that these motors on an average battery (say the 145mah lipos) will last 4 or so minutes??

I'm not quite sure whats an acceptable flight time in the general E-world.

Thx
WarpdSpazm is offline Find More Posts by WarpdSpazm
Reply With Quote
Old Feb 06, 2005, 09:40 PM
in persuit of low wing loading
Gordon Johnson's Avatar
Boston, Mass
Joined May 2001
6,426 Posts
I was referring to the indoor RC duration competition category, which I know Del is interested in. Yes, no problem with obtaining the flight times you are talking about. The amp draw of the Micro Midget is not much different from many M20 setups. Look at the static tests on my site and compare those amp draws to the ones for the micro BL motors.

Gordon
Gordon Johnson is offline Find More Posts by Gordon Johnson
Reply With Quote
Old Feb 06, 2005, 10:01 PM
Micro Brushless crazy
Uttam1's Avatar
India, Bangalore
Joined Jul 2002
1,009 Posts
Depending on your plane setup, and weight, you'll definitely get more than
4mins! For example, for a single cell motor powering a plane with an AUW of
lets say 28gms, you'll probably be cruising at the 500ma range. For the 2
cell wind, lets say you have a plane that weighs 40gms, you'll probably be
doing most of the flying in the 500-600ma range, and using higher bursts
occasionally to get higher quicker, or to get out of trouble. IMHO, you
should be getting around 12-15mins with some throttle mgnt with the 145's,
more with the 170's.

Uttam
Uttam1 is offline Find More Posts by Uttam1
Reply With Quote
Old Feb 06, 2005, 10:04 PM
Registered User
NYC, NY
Joined Jan 2005
125 Posts
That's wonderful Uttam... It means I can fly three rounds on 1 charge.... Now when you gonna start shipping those babies?
WarpdSpazm is offline Find More Posts by WarpdSpazm
Reply With Quote
Old Feb 06, 2005, 10:10 PM
Micro Brushless crazy
Uttam1's Avatar
India, Bangalore
Joined Jul 2002
1,009 Posts
WarpdSpazm, you should be looking at about a month or so, they will be available thru major dealers

-Uttam
Uttam1 is offline Find More Posts by Uttam1
Reply With Quote
Old Feb 07, 2005, 02:00 AM
Team30 Micro EDF
NitroCharged's Avatar
Adelaide, Australia
Joined Apr 2004
11,191 Posts
yippee!!!
NitroCharged is offline Find More Posts by NitroCharged
Reply With Quote
Old Feb 07, 2005, 02:50 PM
del
Registered User
del's Avatar
north of Chicago
Joined Feb 2003
1,827 Posts
Thanks for the info Gordon,
--del
del is offline Find More Posts by del
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Help me decide on brushless motor test protocol ScienceGuy Power Systems 7 Apr 25, 2004 11:39 AM
Survey- New Micro Brushless motor fill Parkflyers 70 Jan 10, 2003 12:51 PM
Survey- New Micro Brushless motor fill Scratchbuilt Indoor and Micro Models 0 Jan 31, 2002 11:52 AM
Pager motor test results epilot Scratchbuilt Indoor and Micro Models 3 Dec 29, 2001 01:49 PM
mighty micro brushless motor and 2 escs F/S misskimo Aircraft - Electric - Airplanes (FS/W) 1 Nov 30, 2001 07:24 PM