What size EDF do I need?
It’s super helpful! As a rule of thumb, the exit diameter should be about 90% of the fan diameter. For the length, a thrust tube should be around 4x longer than the fan diameter.
How is thrust measured in EDF?
Start by using a wattmeter which is a direct measurement of power. It can’t measure efficiency losses but it is a good starting point to know the health of the system, including the battery. I measure my thrust in the plane by simply hooking up a luggage scale on flat ground. It gives good results for me.
How do you increase thrust in EDF?
By decreasing the exhaust exit diameter the airspeed rushing out will increase. This may also increase the maximum speed of your model. By increasing the exhaust exit diameter, additional thrust may be gained.
How do I choose an EDF motor?
Selecting EDF Brushless Motor Size From knowing the EDF unit, motor can diameter can be determined. The diameter of the can is restricted by the fan units maximum allowable diameter. Common values can be found on the EDF unit page for maximum diameter.
What does EDF stand for RC?
Electric duct fans
Electric duct fans (EDF) operate with less noise and more efficiency while still offering RC aeromodellers the potential to experience the thrill of seeing their winged replicas soar through the air. EDF planes run with multi-bladed propellers, taking in air and spinning at high speeds.
How does an EDF fan work?
EDF Power Systems The fan is supplied with air via suitable ducting, and the exhaust air is ducted out to the tail pipe. The principle of the fan is exactly the same as for a propeller driven model; the fan ‘sucks’ air in, and expels it at high speed, the result being that the model is propelled forward.
Are EDFs loud?
EDFs traditionally have had a rotor with four to six blades. These fans can be loud and have a whine that some have compared to the sound of a hair dryer or a leaf blower, especially in the 50mm to 70mm sizes.
What is KV for EDF?
Generally, most EDF units will run between 30000 RPM and 50000 RPM….Selecting EDF Brushless Motor KV.
| LiPo Cell | KV Range |
|---|---|
| 8 cell LiPo | 1000-1700Kv |
| 10 cell LiPo | 800-1350Kv |
| 12 cell LiPo | 675-1120Kv |
What is EDF motor?
Abstract. Electric Ducted Fan (EDF) is an electric propulsion consist of duct, fan and electric motor with main power source is from battery which generates compression air for thrust. EDF is used as an alternative propulsion for high speed UAV especially for target UAV or “bomb” controlled UAV.
What is the fastest EDF Jet?
Havoc Xe 80mm EDF Jet The HAVOC can fly as fast as 140 mph without sacrificing in terms of maneuvering and aerobatics.
How does an EDF work?
An Electric Ducted Fan is exactly what it says on the tin: it’s simply a fan, with multiple blades, that is mounted inside a duct or shrowd. They work by accelerating the air drawn into them creating thrust.
How do you calculate thrust of a ducted fan?
The thrust of a rotor is CT⋅ρ⋅Area⋅tip speed2.
- ρ = air density (1.225 kg m−3 at sea level).
- Area = area of rotor disc (m2)
- tip speed = the linear speed at the tip of the rotor = radial speed * radius.
- CT = coefficient of thrust. ( is usually in the order of 0.02 to 0.05 for small rotors)
What is EDF propulsion?
Are ducted fans more efficient?
The high-bypass turbofan engines used on many modern airliners is an example of a very successful and popular use of ducted fan design. The duct increases thrust efficiency by up to 90% in some cases, in comparison to a similar-sized propeller in free air.
What does EDF stand for in RC?
What is the biggest RC airplane in the world?
In the absence of an official Guinness World Record on the subject, the world’s largest RC airplane appears to be this incredible replica Concorde. Built to a 1:6 scale, the model was designed and built by Steven and Matthew Bishop.
What is EDF score?
CREDIT MEASURES EDF stands for Expected Default Frequency and is a measure of the probability that a firm will default over a specified period of time (typically one year).
What is EDF model?
The EDF model holds that a company is considered to be in default when the market value of its assets decreases below the book value of its liabilities. EDF is a trademarked term for the default probability derived by Moody’s Analytics, Inc.
What is fan thrust?
THE THRUST FORCE CREATED BY A FAN IS A FUNCTION OF THE TOTAL STATIC PRESSURE AND THE. CROSS SECTIONAL AREA OF THE FAN OUTLET. TO ESTIMATE THRUST FORCE, USE THE FOLLOWING. FORMULA: Ft = (PtXL)(W)(5.2)
How fast are EDF Jets?
One of the things which attracted me to RC model planes was the speed they go – it’s really awesome from where we’re standing, on the ground….The Type Of Engine.
| Type of Engine | Speed (MPH) |
|---|---|
| Electric & Electric Ducted Fan (EDF) | 50 – 300+ |
| Jet (turbine) | 150 – 460 |
| Rocket | 200+ |