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EDF for about 4kg thrust using low cost motors

Old 02-08-2020, 03:34 PM
  #1  
Shantz
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Post EDF for about 4kg thrust using low cost motors

I need to design an EDF for a project which requires around 4kg thrust for a VTOL Hopper/Lander vehicle which utilises thrust vectoring.

Buying a EDF unit for this much thrust would cost way too much for my budget.

Instead I can build the props and the frame on my own and buy the brushless motor separately. Can you provide some suggestions for purchasing a motor (or motors) for under $35?

Last edited by Shantz; 02-08-2020 at 04:10 PM.
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Old 02-09-2020, 11:03 AM
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solentlife
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Suggest looking at eCalc .... and try combos of motors and EDF / ducted props.

4kg is a lot of thrust and would require a serious EDF .... most likely a ducted prop would be better ...

To get that sort of thrust - I have 48 to 50 size brushless motor and anything from 14" prop upwards !
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Old 02-09-2020, 03:13 PM
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quorneng
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Shantz
It would help if you describe what the 4 kg of thrust is for and how it is to be used in VTOL For instance one motor or many?
All VTOL requires specific control and stability features that are likely to make the required thrust not the most difficult element to achieve.
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Old 02-09-2020, 06:19 PM
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ron_van_sommeren
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The better the questions, the more info, the better the answers can be.
E.g. you would not be the first one to mistakenly assume that prop thrust must be higher than plane mass in order for a plane to be able to fly at all.

As Nigel suggested in post #2 e-calculators such as www.ecalc.ch (18 languages) can get you in the ball park (software: garbage in, garbage out).
A watt-meter is a must, it will let you check/refine/debug your new/changed power system, and watt-meter will pay for itself several times over.

Forum usage: entering country and/or region and/or location in your profile makes it possible for us to refer your to help, shops, events, people, clubs, ...
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Old Today, 05:52 AM
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Shantz
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Originally Posted by quorneng View Post
Shantz
It would help if you describe what the 4 kg of thrust is for and how it is to be used in VTOL For instance one motor or many?
All VTOL requires specific control and stability features that are likely to make the required thrust not the most difficult element to achieve.
I am trying to design a rocket style body with 4 thrust vectoring vanes/fins in 'plus' configuration. Because the motor and prop will be seated inside the rocket body tube, I did not opt for a ready-made EDF. I think it will be more beneficial if I use a stand-alone motor and prop.
I will probably have a inner diameter of 8 inches with the body made of PVC. I can use one or two motors in opposite directions to counter torque. most of the weight would be of the 4 batteries (3S 3300mAh) and a payload of 500gm near the top. I can reduce the body weight to 2.5 kgs
It will have a rocket style launch and therefore requires high acceleration. I also want to hover. This is my current design.
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