This project started in after realizing I could not convert my old IC Dynamax ducted fan because a conversion kit did not exist. Having no desire to throw away a perfectly good ducted fan, I set out to design and produce conversion parts that would meet my needs. Initially, my intentions were to produce something suitable for a lb thrust fan.
Changesun 70mm 12-Blade EDF Unit
However, after some testing, I realized that the Dynamax could be pushed much further. After some good results, I decided to make this kit available to the EDF community.
Considering the length of time the Dynamax had been available on the market, it was natural to assume that there would be others with the need to convert their old glow powered Dynamax jets as well. With ever improving and increasingly affordable battery technology, there is every reason to make the jump from glow to electric. When the Dynamax fan was originally designed and produced by Tom Cook, the only thing available to power it was an O.
Unfortunately, the maximum potential of the Dynamax could never be reached using IC engines due to their RPM and power limits. Thankfully, these limits are no longer a factor. Modern brushless motors and electronic speed controller technology provides a light weight and extremely powerful solution that was not imagined previously.
This combined with 3D printing, product design is limited more by imagination than anything else. So, wether you are looking for a light weight fan to replace a messy glow powered fan or a high power monster to fly 30lb jets with authority, look no further than the Dynamax. Explore all the options by scrolling down to see everything I have available. Click HERE to learn more about my testing methods. Depending on the application and budget, existing fans that are in good conditioncan be converted by the end user with the use of some common HET 50mm in-runner motors.
These motors can be operated from 10s up to 15s based on the motor KV see testing videos for specifics. For those looking to fly sport jets that traditionally have required gas turbines, look no further than my custom built V2 and "CAT" series of plug and play fans that won't break the bank.
Click below to learn more:. Thanks to 3D printing, we now have the ability to design, print, and use very complex shapes. Thanks to this technology, I have been able to expand the operating envelope of the Dynamax significantly.
Whether using a low power setup or a high power setup, it is vital to provide the motors with the maximum amount of cooling possible. Click the link below to see everything that is available. Powered by GoDaddy Website Builder. Dynamax EDF Systems. DIY Conversion Kit. Testing Method.
Buy now. Project History. Product Line. The DIY V1 Conversion Kit lbs of Thrust Depending on the application and budget, existing fans that are in good conditioncan be converted by the end user with the use of some common HET 50mm in-runner motors.
Learn More. Buy now on Shapeways. Contact Us. Drop us a line!It was not so many years ago that electric ducted fan EDF models were a somewhat impractical proposition; whilst they flew, very often they did not have the kind of performance commensurate with their sleek jet appearance.
However, brushless motors and lipo batteries completely changed the EDF landscape; now electric jets commonly have a performance entirely in keeping with their appearance. There are three factors which allowed practical, high performance EDF models to become an every day reality. These are high power brushless motors, high performance lipo batteries, plus improvements in both fan and ducting design. Combined, these factors now allow practical EDF models to enjoy the sort of phenomenally exciting performance that was unimaginable only a few years ago.
Understanding Brushless RC Motor Specifications
An ESC and lipo battery complete the power system, exactly as for a prop driven model. 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. EDF Power Loading The high revving small fan or impeller of EDF models can never be as efficient as a larger propeller rotating at a lower speed, so the inefficiencies inherent in EDF models have to be compensated for by providing for considerably more input power than might be used with a prop driven model.
A power loading power to weight ratio of Watts a pound will generally provide a sprightly performance to any propeller driven sport model, but this would not usually be enough to endow an EDF model with decent performance. Note that the quality of the ducting can make a big difference to the performance of a model. A typical EDF small fan. This one is a 70mm unit click image to return to original size.
The model weighs EDF enthusiast Brian Jones is the builder click image to return to original size. Thsi small EDF Salamander is delightful click image to return to original size. Batteries for EDF models are often split into several packs in order to accommodate them within the available space click image to return to original size. Fan unit - general The heart of any EDF model is its motor and fan.
The size of a fan unit is specified in terms of their internal diameter. There are a wide variety of fan units available in many sizes from tiny 25mm units up to mm or more.Charts will be present that will give more information on the motors that we carry.
There are many combinations and set ups that will work for electric powered aircraft. Here are some formulas that will make it easy for you to determine what the proper set up will be for a jet. These are approximate numbers depending on efficiency, quality of connections, and resistance, but this guide line will help determine what set up to use with electrics. The data below are estimations based on the above formulas and information provided by the manufacturer.
Fan Jets USA is not responsible for changes in the specifications of the motors by the manufacturer. The following are recommended setups for edf units based on fan rpm's. The higher the fan rpm, the faster the jet.
Please note that mm fans are rated up to 50, rpm. Any thing above this, may exceed the manufacturers recommendations. The 90mm edf's are designed to operate from 30, to 47, rpm. Speeds vary based on the weight and aerodynamics of the jet. The mm edf units are designed to operate around 24, to 38, rpm. Be sure to use a watt meter when programming the power system to check watt and amp draw.
This can be limited by adjusting the throttle epa's. Going up in blade count will have an impact on watt and amp draw. Generally a lower kv motor should be used on edf's that have higher blade counts. For more information on how electric power works in r.
Electric Setup Guide. To calculate your fan rpm's. To calculate what KV motor you need. To calculate what battery you need.Login or Sign Up. Posts Latest Activity.Ikarus electric "rocket" - Thrust-vectored flying ducted fan
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I like to gain some knowledge of EDF fans and ducting. My FW A has no ductwork to speak of and of course, my F-4 does. I will be purchasing the FA when offered. The differences in my observation are A has no ducts so efficient is as good as is possible, Fhas bifurcated ducting so a smooth duct interior would be relevant, FA presumably has bifurcated ducting and an additional vent cheater if I am reading the forum correctly.
So my question: Is there a formula used in design to determine duct opening sizes and lengths related to fan size? Does anyone mod these as a rule? I get it, in that, if it ain't broke don't fix it, though I would like to know how it all works and if there are things I can do to increase efficiency.
Inquisitively, LB. Captain: Got any ideas? Tags: None. Apr 15th,AM. Hi Elbee! Great question, and one that we could discuss ad nauseum. I'll try to summarize as best I can. First, it's important to establish a few parameters: 1 We're dealing with models here.
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Our models scale down, but air doesn't. We could say the same for wings, fuselages, etc, but in the context of your question let's just focus on air interacting with a model aircraft's duct and the EDF inside that duct. With those points established, we can state that the more efficiently airflow can enter and transit through your model's 'ducting and then be accelerated out of it, the better. You can also begin to envision what factors negatively impact that entrance, transit, and exit.
These negative factors include: 1 Anything that interrupts the airflow's external, pre-entrance state. This can be a physical barrier, or even the surface tension of the ducting material we'll talk about boundary layers later. These transitions cause turbulence which slows the air down.
Imagine a straight straw of consistent inner diameter, and then imagine a straw with an alternating inner diameter from large to small to large to small. It's easy to imagine that a liquid will pass through the first straw more easily than the second.
Resistance begets turbulence which begets slower exiting airspeed for a given amount of watts consumed in an EDF system. For example, trying to sneeze throw a coffee stirring straw.
This creates pressure between the EDF and the exhaust outlet because the fan can't get the air out fast enough. This creates drag as turbulent air spins in front of the fan because the fan can't ingest it fast enough. With these negative factors identified, you probably can fill in the blanks for positive factors that avoid these negative factors, such as: 1 Smooth inlets 2 Smooth ducting surface 3 Consistent total area of the duct 4 Minimal if any changes to the direction of the airflow within the duct 5 Sensible amount of airflow brought in and sensible sized outlet to let that air out with the least resistance and with the targeted amount of velocity for a given watts consumed.
The remaining donut is the area swept by the impeller's blades, hence the term Fan Swept Area.Skip to main content EDF Motor.
Only 1 left in stock - order soon. Amazing product. Works as advertised. Add to cart. Currently unavailable. As expected, I'm very pleased with it. Nice un it and not expensive! See All Buying Options. In Stock. This is the edf housing and rotor only.
It allows you to choose between the original kv motor and the new kv motor. We used this and the kv motor for a ducted fan "outlaw" pinewood derby car.
The system performed well and was only outdone by a 54 mm fan. We plan to use it next for an e. Only 4 left in stock more on the way. It made my stinger 64 a rocket. Highly recommend.
Only 2 left in stock - order soon. Besides being cool looking, as a new rc airplane hobbyist it would be nice for there to be instructions on how to use,and mine didn't come or is missing a screw. Awesome EDF works great. Best if bought together as one unit. It has very tight tolerances. For that reason, would recommend spending the money for the one that comes with the motor.
Very very used and beat up product that took 2 months to ship.
SHOP HACKER STREAMFAN UNITS
Works verywell lots of power. Shipped quickly and was packed well. What a fabulous seller product as described arrived way ahead of time would highly recommend and use again.
Fantastic communication as well pleasure to do business with you. There's a problem loading this menu right now. Learn more about Amazon Prime. Get free delivery with Amazon Prime.Jetfan mm Pro, EDF unit. Not to be confused with the earlier discontinued Jetfan "ECO". It's very smooth running and has a pleasant "whoosh" sound, while maintaining lower amp draw, and higher efflux velocity than many other high blade count fans.
We are the Jetfan specialists in the USA. Please call us with any questions you might have regarding this product. We stock a variety of the popular, resonably priced HET motors. We can also perform airframe specific or, per your specifications wire mods, as well as provide a full PNP set up for you. Our orders "in stock" items, not requiring labor usually ship within 24hrs!
We ship everything USPS Priority mail. In most cases, you will receive your order in days cont. Jetfan Pro EDF unit. Specifications: Rotor dia: Shaft adaptor: accepts 8 mm motor shafts Weight: g with motor screws and washers Length: 80 mm Housing O. As with all our EDFs, professional assy and dynamic balancing is available at an added cost. Click To Enlarge. Related Items. Quick Search Advanced Search.
All rights reserved.Your 1 Source for RC Models. Live chat. Your current wishlist is not saved. Please Log in to save it. Originally equipped motor in L has failed after aprox. MotionRC sent me a new one immediately - thank you a lot! It works well nevertheless it is more noisy then the original one. It is a wonder to get 2 kW from such us small motor! Airplanes "Close Cart". Helicopters "Close Cart".
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