The problem is this. My battery has 500mAh capacity, which, at a voltage of 7.4V, give a capacity of 0.5*7.4 = 3.7 Watt-hours. If my motor only draws 0.5W, then the battery should last for 7.4 hours! Something must be wrong here. Am I calculating my battery capacity wrong?
I'll give you all of the specs for the plane in question. It's scratch-built, so you won't find it online anywhere.
I've been using approximations up until now, but no approximation should knock my power required out by 100x...
Mass: 23g(motor) + 36g (battery) + 10g(airframe) + 20g(All other...
There was a typo in my formula, sorry. It's supposed to be:
Preq,min = 4/3*W*√(W/S*2/ρ*√(3*CD0/(π*ε*A)3)), which is equivalent to what you are using.
The reason I'm confused is that a power drain of 0.051W would take 70.8 hours to deplete the battery I'm using (500mAh or 13 000 J), whereas...
Hi all,
I'm having trouble with the power required formula for steady level flight.
Here's the formula:
Preq = 4/3*W*sqrt(W/S*2/ρ*sqrt(3*CD0/(π*ε*A)))
I'm using this for a small indoor RC fixed wing. The values I'm using are as follows:
Weight, W = 0.3924N
Wing Area, S = 0.073 m^2
Density, ρ...
Oic. I was under the impression that low Earth orbit was getting cluttered up with sattelites, discarded retrorockets, waste, dropped spanners etc. After all, we have been messing around up there for the last 50 years. Plus you might have trouble tracking the smaller annoying stuff.
Hey there,
The other day i was solving a simple curvilinear motion problem that used a sattelite in orbit around the Earth as an example and it got me thinking.
If a geostationary sattelite is always above the same region of the Earth (and can only occupy an orbit of a certain altitude) it...
Hello,
I have been reading up on ionizing air guns, such as those used in silicon valley cleanrooms, and as i understand it they are used to remove static charge from circuits and such. This would imply that the gun is creating positive ions, and thus it is somehow dislodging electrons.
What...
I've come to understand that the moon has, beneath its surface, mass concentrations (masscons) that cause an orbiting craft to take a rather irregular orbit, and 'dip' when it passes over these areas.
Do we know what these masscons are comprised of?
If not, what are the most feasible...
I have been informed that such devices can produce large voltage sparks from low voltage power supplies, but i was always under the impression that capacitors discharge in a manner that is simply the opposite of the charge graph.
1)So how do these circuits work?
and
2)Are the US navy using...
Zz, when you say 'particle accelerator', are you referring to an electron gun or equivalent?
I've always wondered how capacitor-discharge ignition circuits work. I'll start a new thread on it, please contribute.
Can you use them to produce short bursts of high energy photons?
What are the effects of Spacetime "Drag"?
I have learned that general relativity predicts that a rotating body (such as earth) produces not only a curve in the spacetime continuum, but it also 'drags' spacetime in the direction of rotation.
1) How is this possible?
2) What effects does...
Thank you very much.
It would appear that producing x-rays is an energy intensive process that requires a lot of specialised equipment.
I have heard of oil molecules being ionised by x-rays, and you have pointed out that individual isolated atoms can be ionised, but that they will not need...
Hello,
I am fascinated by the properties of x-rays and their many uses, but i need to clarify a few things:
1) Can x-rays eject electrons from non-metals and possibly even gases, or is compton scattering constrained to metals only? (ie. photoelectric effect)
2) How do you synthesize...