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Hi I edited the message, its a lot longer now, might want to maybe check again. point is: aerodynamics stop working at one point when there is no material to spin- You must go to rocket based propulsion if theres no atmosphere at that point.
originally posted by: SpaceBoyOnEarth
a reply to: neutronflux
If 750g test chopper can fly in 9mbar (like nasa claims), it should also be able to fly:
7.5kg at 90mbar.
75kg at 900mbar.
But obviously it will not.
High altitude rotors at sea level
inspirepilots.com...-146239
High altitude 1360x prop question FINALLY answered...
inspirepilots.com...-135194
6 Drones That Can Reach High Altitude 2019
www.droneguru.net...
The Inspire 2 is rated for an astounding 16500 feet above sea level. In order to reach that height and operate in such thin air, you do however need the special high-altitude props. This means you can use this drone to film in locations with thin air without worrying that your baby will fall out of the sky.
originally posted by: SpaceBoyOnEarth
a reply to: galadofwarthethird
Not in one day, but one day. Meaning, one say in the future.
It is only calculated in millions of kilometers not longer. It is basically a void, just go fast enough.
originally posted by: SpaceBoyOnEarth
a reply to: neutronflux
lift is equal to density if rotor is same and rpm and gravity.
originally posted by: neutronflux
originally posted by: SpaceBoyOnEarth
a reply to: neutronflux
lift is equal to density if rotor is same and rpm and gravity.
Ok? Then how is the NASA Mars helicoptered rotors the same as anything preceding it?
originally posted by: SpaceBoyOnEarth
originally posted by: neutronflux
originally posted by: SpaceBoyOnEarth
a reply to: neutronflux
lift is equal to density if rotor is same and rpm and gravity.
Ok? Then how is the NASA Mars helicoptered rotors the same as anything preceding it?
I did a reverse calculation. Nasa didnt expect that someone would do it.
Chopper could lift itself at a stripped weight of 750g in 9mbar chamber (supposedly 9, more like 100-300, my view).
Then it should lift 7.5kg at 90 mbar. 75kg at 900 mbar.
But it aint doing it. Obviously.
Helicopter Flight Physics
www.intechopen.com...
Vertical climb
Considering the helicopter in climb, one can see that the flow enters the stream tube far upstream of the rotor and then passes through the rotor itself, finally passing away from the rotor forming the wake ( Figure 6 ). When the helicopter leaves the hovering condition and moves in a vertical direction, the flow remains symmetrical about the thrust force line, which is normal to the rotor disk. The flow becomes very complex in a medium descent rate condition, but in climb, the mathematical approach is close to that used in the hover conditions.
The air enters the stream tube with velocity Vc and then acquires an additional velocity vi as it passes through the helicopter rotor disk, and finally, it forms the wake with a velocity Vc + vi . Applying the principles of conservation for mass, momentum, and energy like in the hover we get:
ṁ =ρA(VC+vi);T=ṁ w;w=2vi
m
̇
=
ρA
V
C
+
v
i
;
T
=
m
̇
w
;
w
=
2
v
i
E17
Therefore, T=ṁ w=ρA(VC+vi)⋅2vi
T
=
m
̇
w
=
ρA
V
C
+
v
i
⋅
2
v
i
and dividing by 2ρA it follows that
T2ρA=(VC+vi)vi=VC⋅vi+v2i
T
2
ρA
=
V
C
+
v
i
v
i
=
V
C
⋅
v
i
+
v
i
2
E18
The left part of the above equation represents the square of induced velocity in hover, v2h
v
h
2
, and replacing it, we get
v2h=VC⋅vi+v2ior(vivh)2+VCvh⋅(vivh)−1=0
v
h
2
=
V
C
⋅
v
i
+
v
i
2
or
(
v
i
v
h
)
2
+
V
C
v
h
⋅
(
v
i
v
h
)
−
1
=
0
E19
The ratio vi /vh must always be positive in the climb, so the valid solution is
vivh=−12VCvh+14(VCvh)2+1‾‾‾‾‾‾‾‾‾‾‾‾√
v
i
v
h
=
−
1
2
V
C
v
h
+
1
4
V
C
v
h
2
+
1
E20
The power consumed is given by the product of the thrust and the total velocity through the rotor disk, that is
P=T(Vc+vi)=T⋅VC+T⋅vi=Pclimb+Pi
P
=
T
V
c
+
v
i
=
T
⋅
V
C
+
T
⋅
v
i
=
P
c
lim
b
+
P
i
originally posted by: SpaceBoyOnEarth
a reply to: OneBigMonkeyToo
Sorry its the truth. (My opinion)
We didnt come from monkeys is for sure.
Yea do i have evidence? Well if i had a time machine and could take a videocamera with me then maybe.
This sounds crazy i know, but what can i do, this is what i saw.