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Old 11-29-2017, 05:49 AM   #1
chonebone42
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Default 4 yellow Bee motors on a scale B 24

Hi, I'm a new guy on this forum, and I'm fairly new at E flight, but a long -term glider and powered flight veteran. Also a committed experimenter and home builder. I need some advice on my project.
I have a bunch of parts from Harbor Freight Yellow Bees, including brushed motors. I'm building a scale B 24 D with 4 motors from the Yellow Bees.
I tested a Yellow Bee motor at WOT with a prop on 5VDC, and it pulled 3.06 amps.
So, my questions are:
1. would a 15amp brushed ESC with BEC run all 4 motors?
2. what size wires between the Lipo and the ESC, or between the motors and the ESC?

The B 24 has the same wingspan as the Yellow Bee (31"), and it will weigh a little more, but not much.
I really appreciate your advice and expertise.
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Old 11-29-2017, 10:55 AM   #2
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Originally Posted by chonebone42 View Post
Hi, I'm a new guy on this forum, and I'm fairly new at E flight, but a long -term glider and powered flight veteran. Also a committed experimenter and home builder. I need some advice on my project.
I have a bunch of parts from Harbor Freight Yellow Bees, including brushed motors. I'm building a scale B 24 D with 4 motors from the Yellow Bees.
I tested a Yellow Bee motor at WOT with a prop on 5VDC, and it pulled 3.06 amps.
So, my questions are:
1. would a 15amp brushed ESC with BEC run all 4 motors?
2. what size wires between the Lipo and the ESC, or between the motors and the ESC?

The B 24 has the same wingspan as the Yellow Bee (31"), and it will weigh a little more, but not much.
I really appreciate your advice and expertise.
It wont be worth the hassle to use the Cheap yellow bee power system, not enough power for the B 24, use brush less motors.

I may be getting Older, But I Refuse to grow Up I am Having to much Fun to Grow Up LOL
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Old 11-29-2017, 03:32 PM   #3
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Well, you may be right, but I'm almost all the way there anyway. If it doesn't work, I may switch to brushless. Thanks for your viewpoint.
BTW, I went out to Hesperia 18 or 19 years ago to buy a garage full of RC stuff. An old man had died and his wife sold the whole bunch.
There was a Giant ugly Stik, a couple of 8ft.WS biplanes, a Skymaster, and tons of various parts. She kept two or three large biplanes herself.
I'm still digging into the boxes of parts I got back then. Thanks again, but what about that 15A brushed ESC with BEC?
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Old 11-29-2017, 09:07 PM   #4
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Originally Posted by chonebone42 View Post
Well, you may be right, but I'm almost all the way there anyway. If it doesn't work, I may switch to brushless. Thanks for your viewpoint.
BTW, I went out to Hesperia 18 or 19 years ago to buy a garage full of RC stuff. An old man had died and his wife sold the whole bunch.
There was a Giant ugly Stik, a couple of 8ft.WS biplanes, a Skymaster, and tons of various parts. She kept two or three large biplanes herself.
I'm still digging into the boxes of parts I got back then. Thanks again, but what about that 15A brushed ESC with BEC?
The Motors on the Yellow bee are a pusher Motors and props, you may be able switch the wires around to get the motor to turn in the opposite direction but then the props are pushers and may not give you enough thrust, the 15 amp esc may work, you can use the same wire size that the motors came with, you will need to use 2 of the yellow bee batteries in parallel for enough amps or a single lipo of enough amp capability, I have never ever had any luck using brush motors in my builds, my brushed motor planes would roll on the ground real fast but never take off LOL switched to brush less motors, and problem resolved.

here are a few of my scratch built planes Enjoy, Chellie

https://www.wattflyer.com/forums/showthread.php?t=55444

I may be getting Older, But I Refuse to grow Up I am Having to much Fun to Grow Up LOL
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Old 11-29-2017, 11:07 PM   #5
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I played around with the props and the motors. I can get the motors to run the way I want them to, and I cut the prop hubs off, so I can run them either way. Thanks for the advice and the build photos. I'll add some of my homemade stuff here when I get a moment
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Old 11-30-2017, 12:10 AM   #6
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chinebone42
Success of your B24 will all come down to its weight and its wing loading.
Weight and sink rate (a function of its flying speed) determines the power required to fly.
The Yellow Bee has very simple controls, throttle and differential thrust. It would be hard to make a lighter control system. Will your B24 retain this form of control?

I built this twin (all 2mm Depron) that uses miniature brushed motors that have tiny contra rotating 2.5" diam props.
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Rudder, elevator and throttle with a 500mAh 2s LiPo it flies remarkably well but only in really calm conditions.


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Old 11-30-2017, 01:04 AM   #7
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I plan to use a small Lipo 2s and a lightweight ESC with BEC. I anticipate throttle, ailerons, and elevator as controls. Probably counter-rotating props, too. Two 9g servos
The Yellow Bee RTF weighs 220g.
Most of my weight savings will be in the fuse, which is super light foam.
Wing and tail feathers are balsa
Any idea what your Lipo weighed in your micro twin?
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Old 11-30-2017, 02:19 PM   #8
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chonebone42
My 500mAh 2s weighs 31.3 g (1.1 oz)

I would suggest that you certainly don't need 9g servos.
With such a light plane 3.7 g would be quite adequate as long as the control surfaces and linkages are really free moving.

I have no fear using 3.7 g servos, particularly on the ailerons in quite large but relatively light planes. Where speed, weight or particularly big control surfaces are a concern I do go up to 5g!

This 52" (1320 mm) span Bombardier Dash 8 weighs nearly 2 lbs (900g) but flies quite happily using 3.7g servos for the ailerons and rudder. More for 'just in case' then necessity it has a 5g servo for the elevator.
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What is the wing span of your B24 and do you know what its final weight is likely to be?


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Old 11-30-2017, 03:36 PM   #9
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Originally Posted by chonebone42 View Post
... would a 15amp brushed ESC with BEC run all 4 motors? ...
It is a good practice to have some headroom built in.
Lucien Miller (Scorpion USA) about derating motors, controllers, batteries, electronics in general:
Originally Posted by chonebone42 View Post
... I'm fairly new at E flight ...
Some well-structured reading and handy e-tools for rainy/windy days. Will save you, and us , a lot of questions. Notably the 'what went wrong?' kind of questions
Will also prevent you from burning up several controllers and/or motors and/or battery:
E-flight primer and tools

And please, do your RC equipment, wallet, ego, battery, controller, motor, house/garage/car a big favour ... get a watt-meter. It will more than pay for itself, will save you at least one fried motor and one fried controller. Will also help you finding the best setup.

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Old 11-30-2017, 07:07 PM   #10
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Thanks, Quorneng
Until your post, I didn't realize there were servos lighter than 9g. I appreciate your mentioning that the little ones were adequate on a pretty sizable Dash 8.
So I looked up some sub-micro servos, and plan to get some.
Meanwhile, I weighed all the components of the B-24.
Its wingspan is 31", and the total weight is expected to be around 260g.
Nice job on the Dash8, BTW
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