RE: Best thrust to weight ratio ducted fan jet? They only need to be simplistic just like propellers, got a .40 well stick a 10x6 on it is the rule of thumb but not set in stone. Use our magazine locator link to find your nearest stockist!By continuing to use this site, you agree to our use of cookies. I bet you will be miles away from 7.5 kilo thrust with that crap looking intake. In contrast to the thrust/weight ratio this also considers exhaust speed (all calculations refer to max.
Cookies make it easier for us to provide you with our services. Running on a 4s - and its pulling a 58Amps so 974W electrical -W/lb its going to be around the 220w/lb when its finished - sp from that perspective it should have bags of powerYet when I weight the fuselage with a lipo but the fan off then power up the fan to full I get an extra 660g of extra weight (which is what I am calling thrust)If we assume you testing method itself does not impeded the air flow only getting 660 g thrust is a bit of a concern.Your electrical power figures are reasonably close to the specification (maximum 1000W) at which they claim no less than 1.4 kg of thrust.I am always a bit suspicious of claimed figures (like the claimed hp with IC!) Yes Mark, I have been flying one for years. Figure 9 shows a section of the performance chart for a Cobra CM 2217-20 drone motor. for $2-300 you wont find much . TWR or T/W ratio = (Max Thrust of Engine / (Empty Weight + (3.505 Tonnes of Fuel & Weapons, or only Internal Fuel))) 1.30 - Su-35BM 1.29 - F-15K 1.26 - Su-27S 1.25 - Eurofighter 1.24 - Mig-35 1.23 - Su-27SK & J-11A 1.19 - Rafale C 1.19 - Mig-29M/M2 1.19 - F-15C 1.18 - F-22 (T/W = 1.37 with Round nozzles) 1.16 - Su-30MKK 1.15 - F/A-18E/F 1.15 - Mig-29B (9-12) 1.14 - Su-30MKI 1.13 - Rafale … This is determinable with a scale or can be calculated after having chosen the fan system. I would like to see it updated to view how EDF's improved over the years. So for 974W you should have about 11N or about 1,1 Kg thrust.So it's change of direction within the duct that loses thrust? Best wishes to all, Ron. I ca ntell you that a byron fan puts out about 13-15 lbs of thrust but they arent usually found in aerodynamically clean setups.....but they do fly larger jets ERHHH, Hold your plumbs big plums. For longer flight, we will use a 3:1 ratio. Drop the 14B rotor to start with, its pointless, the 12B is enough, the 10b is the best but with no alloy spinners available (I had to get my CNC guy to make a batch for me) its harder to balance up nicely. The thrust to weight ratio is an efficiency factor for total aircraft propulsion. So Simon's point about low pressure in front of the fan causing a drop in output pressure may well be an answerThe fan duct runs about 14" and goes from 68mm ID down to 50ID - its relatively smooth inside but as it was build around a chuck away mandrel the amount of sanding possible is very limited!So Simon point about low pressure in front of the fan causing a drop in output pressure may well be an answerSurely the air throughout the whole duct starts at atmospheric pressure, it's just the resistance to the air movement of the ducting causing the fan to create lower than atmospheric pressure in front & the resistance to air movement in the rear ducting causing higher pressure behind the fan ?Maybe repeat the test without the top hatch fitted. New to RC flying? It has a high value of excess thrust which results in a high rate of climb. Totally over fetched, you will never get those figures out of your F-16 model.
as the fan has to do work just to restore the pressure back to atmospheric before even beginning to do work to force the air out the back!How can that be if it's located in the atmosphere ?The model in question was tested with the wings and top hatch fitted, so air intake was via the two (over scale) cheek inlet ports.... when static running there is considerable suction on the top hatch (which opens up into the void in front of the midships fitted EDF). & was that to test different EDF fans rather than duct loses?Ducted fan theory and practice from Richard Sharman. - Hi, what is the best ducted fan jet in terms of thrust to weight ratio, limited by a budget of around $100-200? With the usage of our services you permit us to use cookies. dental floss might be less damaging to the good cell of course it depends on the weight of the plane itself. BTW, why are you mixing kilos with pounds? Case Study: Minijets Stinger with DS-51-AXI HDS and HET 700-68-1125kVIn order to avoid a disappointment due to unexpected flight behaviour or insufficient performance of the planned model, we would like to take the opportunity to present some substantiated criteria enabling the realisation of the favoured characteristics for the model.An important point when choosing the right fan unit for the model is the power/weight ratio.
The set up works fine & to me less work to get it as smooth and tight fitting as possible. RC Jets - Best thrust to weight ratio ducted fan jet? Thrust-to-weight ratio is a dimensionless ratio of thrust to weight of a rocket, jet engine, propeller engine, or a vehicle propelled by such an engine that is an indicator of the performance of the engine or vehicle.. An important point when choosing the right fan unit for the model is the power/weight ratio. So got a 2lb EDF then....well I don't know. By searching various aircraft and engine sites on the Internet, fill … It costs about 20% of the EDF's 'free air' thrust.The whole of the duct including the actual inlets themselves are 125% of the fan swept area so duct losses should be recovered by 'ram effect' as the air speed increases.If we assume you testing method itself does not impeded the air flow only getting 660 g thrust is a bit of a concern.Indeed. A moderator felt this post violated the following I ca ntell you that a byron fan puts out about 13-15 lbs of thrust but they arent usually found in aerodynamically clean setups.....but they do fly larger jets battery voltage).\(P_{abges}\) refers to the output power, \(m_{ges}\) refers to the overall model weight.
fast & reliable simulation - no more guessing most comprehensive motor database ☆ over 1 million calculations per month eCalc - fanCalc - the most reliable electric ducted fan Jet Calculator on the Web all het motors for 70mm are 28mm in diameter. My small (32" span) DH Venom flies very nicely with a maximum thrust to weight of just 50%.
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