Interesting how your F16 set up made about 2.9kg. My Stock Sirius made 2.3kg. I then opened up the cheater holes on the sides by 200% and a couple of small holes under the front landing gear and the extra intake area made 2.6kg of thrust. With the canopy off it made 2.7kg.
What is the exhaust diameter on the Sirius? I used a thrust cone reducing to 72mm diameter for the F-16 which is around 100% FSA. Also I cheated a bit. I moved the Xfly motor and rotor into a FMS 80mm shroud. Xfly motor is only 32mm diameter but the made the shroud for 36mm motors, strange. But the rotor hub is 34mm. FMS shroud is for 32mm motors so has higher FSA so probably a bit higher thrust. These high blade count fans usually don’t like much less than 100% fsa exhaust area to max out their static thrust. However if more dynamic thrust is needed for max top speed then its ok to lose a bit of static thrust as long as efflux is higher in flight.
@@r00kiepilot the Sirius diameter Exhaust is 75mm. The BAE hawk 2100kv / 2.9kg of thrust has a 72mm exhaust and L39 2100kv / 3kg thrust has a 66mm exhaust. Both the intakes and cheater intakes on the hawk and L39 are much bigger than the Sirius. Would you say the length of the exhaust has anything to do with it? End of stator to exit of exhaust for Sirius 27cm whilst the L39 is 24cm.
hello, i am not familiar with the RC hobby but i have a personal project i am interested in building that would be using this 80mm EDF. i am wondering if it would be possible to power 3 of them off of one battery . i would only need to maintain full thrust potential on all three, for about a minute and a half tops, even one minute could work....how would i go about determining if this is possible and what is the smallest sized batter capable of achieving this? thanks
Yes of course it is possible. A battery doesn't care how many consumers (motors in this case) it is powering. All you have to do is match the battery max discharge rate with the max load. In this case the max load of one fan at 6s (22.2V nominal) is 108A, so 3 fans would have a peak draw of 324A. Now you need to pick the right battery. Usually the lightest/smallest battery that can handle such a high current would be a high discharge lipo (lithium polymer) battery. LiPO4 or lithium ion would have to be much bigger and heavier to cope with such high currents. The best Lipo batteries can usually cope with a 30C (30 times capacity) discharge rate without getting damaged. So to work out capacity needed to sustain 324A at 30C, divide 324/30 = 10.8Ah. So you would need a 10.8Ah capacity 6s (6 in series) lipo battery. To find out the best battery brands which actually deliver the promised discharge rate, check out MCSGUY battery testing thread on rcgroup. I have myself tested one battery from his thread, the Admiral 5Ah (or 5000mah) 6s 50C lipo. I can confirm it is capable of 30C discharge without sagging too much therefore maintaining good thrust of the fans. So in this case, because they don't make an Admiral 10Ah 50C battery, in this case you would be best to buy two Admiral 5000mah 50C 6s batteries and wire them in parallel. Another excellent brand according to the MCSGUY is SMC racing. Their batteries may be even more powerful and have even less voltage sag than Admiral. Again you may have to buy two 6s batteries of around 5000mah and wire them in parallel to obtain a 10Ah capacity needed to run three 80mm 6 fans like the ones above. The 90mm fans draw a bit more current so if you want to use 90mm instead you may be better off getting two 6000mah 6s batteries. Although I think the 5000mah Admiral would survive as the discharge rate of three 90mm fans would only be at around 35C.
I prefer the FMS, the Xrp gives a little more thrust at higher amps. The Xrp motor is actually lower KV than the FMS despite Xrp claiming 2200kV (I tested both swapping their rotors over). A better upgrade might be to put the Xrp rotor on the FMS motor for even higher thrust.
Hi, you bought the Xfly 80mm fan? First step, read the user manual for your ESC and go through the full throttle calibration procedure. If you still only get 2400g thrust, step 2 get an amp meter and volt meter and measure peak amps and volts when you first hit full throttle. If your amps and volts are close to mine in the video, step 3 measure thrust on different scales your scales could be inaccurate. However if your amps are lower, lets say under 100A, and your peak volts are under 22.8V then your battery is probably too weak.
Thrust always drops when installing a fan, due to fuselage ducting losses, friction, etc. 0.85 of fan-only thrust is actually quite good, I have seen as low as 0.6 in some models. I bought the ARF version so using my own esc, YGE 120A (old version)
Interesting how your F16 set up made about 2.9kg. My Stock Sirius made 2.3kg. I then opened up the cheater holes on the sides by 200% and a couple of small holes under the front landing gear and the extra intake area made 2.6kg of thrust. With the canopy off it made 2.7kg.
What is the exhaust diameter on the Sirius? I used a thrust cone reducing to 72mm diameter for the F-16 which is around 100% FSA. Also I cheated a bit. I moved the Xfly motor and rotor into a FMS 80mm shroud. Xfly motor is only 32mm diameter but the made the shroud for 36mm motors, strange. But the rotor hub is 34mm. FMS shroud is for 32mm motors so has higher FSA so probably a bit higher thrust.
These high blade count fans usually don’t like much less than 100% fsa exhaust area to max out their static thrust. However if more dynamic thrust is needed for max top speed then its ok to lose a bit of static thrust as long as efflux is higher in flight.
@@r00kiepilot the Sirius diameter Exhaust is 75mm. The BAE hawk 2100kv / 2.9kg of thrust has a 72mm exhaust and L39 2100kv / 3kg thrust has a 66mm exhaust. Both the intakes and cheater intakes on the hawk and L39 are much bigger than the Sirius. Would you say the length of the exhaust has anything to do with it? End of stator to exit of exhaust for Sirius 27cm whilst the L39 is 24cm.
hello, i am not familiar with the RC hobby but i have a personal project i am interested in building that would be using this 80mm EDF. i am wondering if it would be possible to power 3 of them off of one battery . i would only need to maintain full thrust potential on all three, for about a minute and a half tops, even one minute could work....how would i go about determining if this is possible and what is the smallest sized batter capable of achieving this? thanks
Yes of course it is possible. A battery doesn't care how many consumers (motors in this case) it is powering. All you have to do is match the battery max discharge rate with the max load. In this case the max load of one fan at 6s (22.2V nominal) is 108A, so 3 fans would have a peak draw of 324A. Now you need to pick the right battery. Usually the lightest/smallest battery that can handle such a high current would be a high discharge lipo (lithium polymer) battery. LiPO4 or lithium ion would have to be much bigger and heavier to cope with such high currents.
The best Lipo batteries can usually cope with a 30C (30 times capacity) discharge rate without getting damaged. So to work out capacity needed to sustain 324A at 30C, divide 324/30 = 10.8Ah. So you would need a 10.8Ah capacity 6s (6 in series) lipo battery. To find out the best battery brands which actually deliver the promised discharge rate, check out MCSGUY battery testing thread on rcgroup. I have myself tested one battery from his thread, the Admiral 5Ah (or 5000mah) 6s 50C lipo. I can confirm it is capable of 30C discharge without sagging too much therefore maintaining good thrust of the fans. So in this case, because they don't make an Admiral 10Ah 50C battery, in this case you would be best to buy two Admiral 5000mah 50C 6s batteries and wire them in parallel. Another excellent brand according to the MCSGUY is SMC racing. Their batteries may be even more powerful and have even less voltage sag than Admiral. Again you may have to buy two 6s batteries of around 5000mah and wire them in parallel to obtain a 10Ah capacity needed to run three 80mm 6 fans like the ones above. The 90mm fans draw a bit more current so if you want to use 90mm instead you may be better off getting two 6000mah 6s batteries. Although I think the 5000mah Admiral would survive as the discharge rate of three 90mm fans would only be at around 35C.
your response exceeded my expectations!! thank you so much for taking the time to help me! @@r00kiepilot
so XFly combo is better than the FMS 80mm?
I prefer the FMS, the Xrp gives a little more thrust at higher amps. The Xrp motor is actually lower KV than the FMS despite Xrp claiming 2200kV (I tested both swapping their rotors over). A better upgrade might be to put the Xrp rotor on the FMS motor for even higher thrust.
hi, I bought an 80 mm ducted fan, which unfortunately did not cost more than 2400 grams, I wanted some advice.
ductedfan 80 mm xfly
120 amp speed controller and 5200 mAh 70C battery
please guide me🙏🏻
Hi, you bought the Xfly 80mm fan?
First step, read the user manual for your ESC and go through the full throttle calibration procedure. If you still only get 2400g thrust, step 2 get an amp meter and volt meter and measure peak amps and volts when you first hit full throttle. If your amps and volts are close to mine in the video, step 3 measure thrust on different scales your scales could be inaccurate.
However if your amps are lower, lets say under 100A, and your peak volts are under 22.8V then your battery is probably too weak.
How come there's a drop in thrust when u install it into the fuselage? Do you still use the stock 100A ESC?
Thrust always drops when installing a fan, due to fuselage ducting losses, friction, etc. 0.85 of fan-only thrust is actually quite good, I have seen as low as 0.6 in some models.
I bought the ARF version so using my own esc, YGE 120A (old version)