Cheap Motors Cheap Propellers Simple Thrust Comparison




I am comparing the thrust I get from the cheap propellers I take from toys and a few 'real' propellers purchased from eBay. The motor weighs in at 16 grammes with nothing attached to it. The best thrust I achieve is about 20 grammes when I connect 12 volts to the motor bearing in mind it is supposed to be running on 1.5 volts in the item I took it from. I am only connecting the propellers directly to the motor shaft, I am not attempting to use any gearing to allow larger propellers. The propellers will not produce their best because they are relatively close to the piece of wood I have fixed the motor to so I have no doubt results could be improved but I would guess they would need to be doubled to allow the motor to lift the additional weight of batteries, RC gear, and a helicopter frame and body.
My advice to a would-be helicopter builder is don't try to save money with cheap motors. You will be spending good money on your RC gear and LiPo batteries and chargers so you might as well get a decent motor and proper propeller/rotor and matching gearing assembly at the same time.

If you are more interested in powering a plane suggest you have a look at the FliteTest channel as they give advice on that sort of thing. In my video I am simply looking at trying to lift vertically. Flying a plane need much less thrust as the wing airfoil is providing the lift and the motor is just pushing the plane forwards. FliteTest Beginners Series https://www.youtube.com/playlist?list=PL6IuSFWz4ktvupu_gxw1vn-sjBGOkJFHV

If you have a question it is probably worth reading this video description first because the answer may already be here. To help you find my videos I made two search guides https://youtu.be/ceBSOoOHcgw or https://youtu.be/Zj4UgwkwYRk or checkout my playlists page https://www.youtube.com/user/GrandadIsAnOldMan/playlists?flow=grid&view=1

+++++++++++++++++++++++++++++++
Here is a summary I have used to reply to some of the comments I have already received.
At the end of the video I am running the motor with 12 volts when it is expecting 1.5 volts so how long do you think it would last before it overheats? This motor weighed 16 grammes without the prop and it peaked at about 20 grammes thrust. The orange prop shown that gives the best result in these tests is 3 grammes including the adapter so that leaves you 1 gramme for the rest of your helicopter including rc gear and batteries. Does that sound like a practical project?
+++++++++++++++++++++++++++++++

Main components
-
Cheap electric motor probably rated at 1.5 to 3 volts
Selection of propellers collected from toys and a few real ones from eBay

I am not endorsing or recommending this product, I suggest you do your own search and check the product details meet your requirements
5pcs 2.0mm RC Aluminum Bullet Propeller Adapter Holder eBay Link http://www.ebay.co.uk/itm/321697109774
That orange prop that seemed to work quite well 5x3 Direct Drive GWS EP-5030 Propeller 5" Prop Orange Airplane Aircraft eBay Link http://www.ebay.co.uk/itm/261730320728

Main Tools
-
8 AA batteries supposed to give us 12 volts but you will see they start to drop quite quickly and measuring across the motor under load gives us a quite different reading. The voltages I am calling out at based on the number of batteries connected in series NOT the reading on the voltmeter.
Digital Kitchen scales which only give readings in single units of grammes but that is good enough to give us a comparison for the purposes of this video.

Filmed using
FujiFilm FinePix S4800

Edited using
Serif MoviePlus Starter Edition
Low Pass Filter 6500 hz

Here is a selection of related playlists
Simple electronic projects playlist https://www.youtube.com/playlist?list=PLA5a2xPRSrB0qd7Hrqoc3II0OU-bx64TA
Using vibrating toothbrush motors or similar https://www.youtube.com/playlist?list=PLA5a2xPRSrB3jAX4ymLvmoN8OtvQkKuTC

Flite Test : RC Planes for Beginners: Power System - Beginner Series - Ep. 6 https://youtu.be/6r9FUadpLVg

I have thousands of videos on YouTube covering a wide range of subjects. To find them follow my search guides https://youtu.be/ceBSOoOHcgw or https://youtu.be/Zj4UgwkwYRk or see my playlists page https://www.youtube.com/user/GrandadIsAnOldMan/playlists?flow=grid&view=1
Generally my projects are for my grandchildren to enjoy. OK, I enjoy them too. If anybody else likes them, that is a bonus. I like to keep my work as simple and basic as possible so that it can be copied easily and improved by anybody who wants to try themselves. I recycle or repurpose items rather than buy new and when I do buy I like to keep it cheap.
https://www.youtube.com/user/GrandadIsAnOldMan

Flights

Air Charter
#<LinkAnchor:0x00000009b1cf98>

This entry was posted in Trade Flights Australia and tagged , , , , , , , , , , , , . Bookmark the permalink.