my 3d printed plane

[drgilo1973]

and now that i have finished printing my 3d concorde i want to share it with u guys its a plane of 2 m long
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[Tarek Hassoune]

Cool Gilbert is this the new version

[drgilo1973]

yes this one is weightless than the first one

[Mezri]

Oh ...Very nice ...dont forget the FMS 50mm EDF...depend on the wheigt you can put 2... or even 4 like the real one...
How much weight and wing surface ?

[Andrew Fernie]

Cool! Is that your own design?

Now we just need to get clearance to fly.

Andrew

[Florin]

Wow, looking at picture I can remark that's a fast one, tricky CG and your are a tall guy ;)

[Dwight Macdonald]

I can't wait to hear it break the sound barrier!

Sent from my Pixel 2 XL using Tapatalk

[drgilo1973]

yes its my own design , actually i wanna put 2*64 mm ducted fan , the plane weight only 1,4kg the lenght is 2m and the wing spam is almost 90 cm , i have to try to fly the boeing 777 before then ill do the concorde , dwight before i brake the sound barrier i wanna be sure that the plane wont break lol

[MichaelLevy]

yes its my own design , actually i wanna put 2*64 mm ducted fan , the plane weight only 1,4kg the lenght is 2m and the wing spam is almost 90 cm , i have to try to fly the boeing 777 before then ill do the concorde , dwight before i brake the sound barrier i wanna be sure that the plane wont break lol

I have a 4S, 64 mm twin powered SR-71. It's 1.16 m long and has a 73 cm wingspan. With your dimensions, you'll be needing two 70 mm fan units.

[drgilo1973]

ok ur right

[Ricardo]

Or 4x50mm... More scale!

[MichaelLevy]

It may be more scale but there is a downside. I doubt 4 50mm fans will give you as much thrust as two 70mm. I don't rely on the manufacturers' data, they don't reflect actual "in plane" performance. I tested both the Freewing and Powerfun 70 mm units in plane and get around 1400 to 1500 gm static thrust on 6S. You'll be lucky to get 500gm from a 50 mm fan unit. They also sound a lot better than 50mm units...unless you like the sound of a dentist's drill :). They are also factory dynamically balanced which is a huge advantage over doing it yourself. Also smaller fans are more inefficient which means your battery won't last as long in flight,and there's also the complexity. The thrust tube can be flattened toward the exhaust end so as not to affect the scale look. That's what I did in one of my planes. It doesn't affect the thrust.

[drgilo1973]

here also 2 more planes
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[Michael O'Bree]

Very impressive.

Does your printer ever rest?!

Air France or BA colours for the Concorde?

[drgilo1973]

my printer is on full action , actually i changed filament coz i didint have enough white so i switched to red , but soon i ll came back to white

[Mezri]

It may be more scale but there is a downside. I doubt 4 50mm fans will give you as much thrust as two 70mm. I don't rely on the manufacturers' data, they don't reflect actual "in plane" performance. I tested both the Freewing and Powerfun 70 mm units in plane and get around 1400 to 1500 gm static thrust on 6S. You'll be lucky to get 500gm from a 50 mm fan unit. They also sound a lot better than 50mm units...unless you like the sound of a dentist's drill :). They are also factory dynamically balanced which is a huge advantage over doing it yourself. Also smaller fans are more inefficient which means your battery won't last as long in flight,and there's also the complexity. The thrust tube can be flattened toward the exhaust end so as not to affect the scale look. That's what I did in one of my planes. It doesn't affect the thrust.

Yes Michael, you are right, the sound is quite differente,...I have A 50mm FMS 3S version, with 3S 850mAhLipo(75C), it gives me 720g thrust first seconds, than around 680gr on 32 Amps...Quite interesting looking in Wheight to thrust ratio...(EDF+ESC+LIPO=200gr)
And my test was just blowingair on the scale...my be more with a real thrust mesurements device.

[MichaelLevy]

Yes Michael, you are right, the sound is quite differente,...I have A 50mm FMS 3S version, with 3S 850mAhLipo(75C), it gives me 720g thrust first seconds, than around 680gr on 32 Amps...Quite interesting looking in Wheight to thrust ratio...(EDF+ESC+LIPO=200gr)
And my test was just blowingair on the scale...my be more with a real thrust mesurements device.
Correct. I get similar results, but the rule of thumb is that you lose about one third of thrust once the unit is in the plane (see link below). So that means 680gm becomes 453 gm in real life! As far as sound, my pre-balanced 6S 70 mm Powerfun Fan motor combo unit sounds the closest to a jet turbine than anything I have ever had before. Light weight, lots of power, no vibrations at all no motor sound.

https://www.rcgroups.com/forums/showthread.php?3138889-Powerfun-12-blade-70mm-fan/page2

[Florin]

This video shows the easy way to measure the thrust
https://youtu.be/okpUOxTpLb8?t=800