amazing machine! do you have the core engine for the back nozzles and the FAn (powered by core engine) for the front nozzles and for charging up the core engine? i would love to look inside this!
Have you ever tried to detect if it experience compressor stall? Cause i think you need to have twin fan to compress more and to stabilize the negative effect of compressor stall or compressor surge.
During the whole demonstration, I was fixated on the lack of heat effect on the background behind where the heat should be ! No Heat ? is this a cold turbine maybe ?
Educated guess: Only the rear outlets have hot exhaust, but the background is just grey low contrast asphalt so it may be that the video compression ignores the subtle effect of heat haze.
I am dubious about this video being authentic. Assuming he used an off the shelf RC jet turbine core, there are none marketed even as of today that I am aware of that feature any bypass. They are pure turbojets rather than turbofans, and also on top of the none I am aware of are even axial flow (all use centrifugal compressor stages). There are off the shelf turboprop and helicopter engines that could use the shaft power to spin a fan but they would not have a lot of residual jet thrust left over once the gas has been used to drive the shaft output, but assuming there was still usable thrust there the hot end would be on the end where the output shaft is, so in this motor the front nozzles (near the fan) would have to be the "hot end" and the back side would be the cold end bypass air. As with a real turboprop the model engines are reverse flow designs which is why the outputs would be reversed. Lastly I doubt a model engine could truly have the fine thrust control to ever hover or vertical land. Even in the real Harrier there was a lot of specific engineering and computer control of power output to make this fine control work "good enough" but it was always problematic. The F-35B solved this with variable vanes in the lift fan to enable very fine control in hover and descent. For a true jet powered model harrier to work I think you would need quite an engineering team and machinists to scratch build an actual high bypass turbofan engine, something on the order of a 50-60% bypass ratio after ducting. The completed model would need at least a 1.1 TWR for any hope of controlled hover, ideally it would actually be closer to 1.4 or more. You would then need to engineer some waste gates into the model, and this is how you would get fine control over hover thrust, by simply dumping some excess through ducts controlled by a butterfly valve that normally sits half open and mixing it with throttle to briefly close when power is added and briefly open when throttle is reduced. This would give very fine, albeit very "hands on" control of power output that would react very quickly. Better still use a micro altitude sensor (tiny radar puck) and an onboard computer like those found in high end drones to augment the pilot commands with valve and engine throttle controls. Again this would all some very tricky, and expensive engineering and a lot of tweaking to get right.
That high pitch whine gets me every time 😍
Same here!
From one Rc vertical lift fan to another (pun intended), well done!
Absolutely beautifully done!
What a beautiful sound..Just awesome!😍
I found a real one for sale. It was only 4.5k but I couldn’t make the wife see the beauty of it.
You should sell these for enthusiasts like me.
With those nozzles facing up you should have sat the thing on a weighing scale to measure the thrust in LBs pressing down on the scale
WELL THAT WAS EXCITING
amazing machine!
do you have the core engine for the back nozzles and the FAn (powered by core engine) for the front nozzles and for charging up the core engine?
i would love to look inside this!
Is it for an miniature AV-8 ?
Have you ever tried to detect if it experience compressor stall? Cause i think you need to have twin fan to compress more and to stabilize the negative effect of compressor stall or compressor surge.
show us how you did it with yours.
O mais legal é o tanque cheio de combustível do lado!!!
During the whole demonstration, I was fixated on the lack of heat effect on the background behind where the heat should be ! No Heat ?
is this a cold turbine maybe ?
Educated guess: Only the rear outlets have hot exhaust, but the background is just grey low contrast asphalt so it may be that the video compression ignores the subtle effect of heat haze.
I am dubious about this video being authentic. Assuming he used an off the shelf RC jet turbine core, there are none marketed even as of today that I am aware of that feature any bypass. They are pure turbojets rather than turbofans, and also on top of the none I am aware of are even axial flow (all use centrifugal compressor stages). There are off the shelf turboprop and helicopter engines that could use the shaft power to spin a fan but they would not have a lot of residual jet thrust left over once the gas has been used to drive the shaft output, but assuming there was still usable thrust there the hot end would be on the end where the output shaft is, so in this motor the front nozzles (near the fan) would have to be the "hot end" and the back side would be the cold end bypass air. As with a real turboprop the model engines are reverse flow designs which is why the outputs would be reversed. Lastly I doubt a model engine could truly have the fine thrust control to ever hover or vertical land. Even in the real Harrier there was a lot of specific engineering and computer control of power output to make this fine control work "good enough" but it was always problematic. The F-35B solved this with variable vanes in the lift fan to enable very fine control in hover and descent. For a true jet powered model harrier to work I think you would need quite an engineering team and machinists to scratch build an actual high bypass turbofan engine, something on the order of a 50-60% bypass ratio after ducting. The completed model would need at least a 1.1 TWR for any hope of controlled hover, ideally it would actually be closer to 1.4 or more. You would then need to engineer some waste gates into the model, and this is how you would get fine control over hover thrust, by simply dumping some excess through ducts controlled by a butterfly valve that normally sits half open and mixing it with throttle to briefly close when power is added and briefly open when throttle is reduced. This would give very fine, albeit very "hands on" control of power output that would react very quickly. Better still use a micro altitude sensor (tiny radar puck) and an onboard computer like those found in high end drones to augment the pilot commands with valve and engine throttle controls. Again this would all some very tricky, and expensive engineering and a lot of tweaking to get right.
Which oil uesd for
You have to mix aviation grade turbine oil into the fuel.
Nice VTOL Awsome
👍👍
14 commentaires : pourquoi il ne bouge pas ça a une force phénomènal...?
VTOL
❤
@@هياالعميري-م4ر ok
وشعشوعسةساشوعشةسعضىس😊
多少钱？