wind tunnel

[Brian]

ive almost finnish a wind tunnel ive been making, and does anyone have anything they want me to test. im going to test a sharp nose cone, round tip, inward pointing rounded tip and some fin and wing shapes.

and does anyone know how to make a small thick smoke so i can look for vortexes and other things.

[Tim Chen]

ive almost finnish a wind tunnel ive been making, and does anyone have anything they want me to test. im going to test a sharp nose cone, round tip, inward pointing rounded tip and some fin and wing shapes.

and does anyone know how to make a small thick smoke so i can look for vortexes and other things.

You could get some incense sticks that they sell like in a cadle shop. Those born slowly and make a little stream of smoke. You could also find out what the chemical they put into a "smoke machine" like they use at parties and dances. That I think makes white non-toxic smoke.

[da-water]

the incense makes smoke but it disappear with a little bit of wind!! u could use something that makes more smoke....

[Tim Chen]

the incense makes smoke but it disappear with a little bit of wind!! u could use something that makes more smoke....

Okay, forget that suggestion.

What about those things that Bee-Keepers use? When they open up the beehives they shoot smoke inside to keep the bees from attacking. The thing looks like a gun that shoots smoke.

[The Mooseheads]

ive almost finnish a wind tunnel ive been making, and does anyone have anything they want me to test. im going to test a sharp nose cone, round tip, inward pointing rounded tip and some fin and wing shapes.

and does anyone know how to make a small thick smoke so i can look for vortexes and other things.

Did you ever finish your wind tunnel? Can you explain how you made it and how it worked?

[Brian]

well i stuck 3 center sections of some 2L bottles together, put a fan infront, a motor with a propellor at the back and a multimetre to measure the volts from the motor. when you turn a motor by yourself it creats a voltage and the faster you spin it the more voltage is created so instead you can blow on a fan to turn the motor but if you put something inbetween the wind and the motor the voltage lower. but some thing less aerodynamic would slow the wind more the motor makes less voltage.

[Brian]

(i forgot to write this earlier)
thats how you measure the aerodynamics of something. im gonna use smoke aswell soon.

[Tim Chen]

That's a clever idea with the fan used to generate voltage to measure wind speed. You could even calibrate the speed by mounting the fan on a car and driving at known speed and getting the voltage at different speeds.

One thing you can improve on is the fan making the wind is creating a lot of turbulence. You need to straighten the sir flow out for best results. On Mythbusters they did a show where they made a wind tunnel and they used a whole case of drinking straws to make a grate that smoothed the air. All the straws together make the air flow parallel to get through them.

[Drag_Racer408a]

Straws will really help a lot with the turbulance. Mythbusters wind tunnel was pretty cool.

It would be sweet if u would put a scale on the back of the object like what they did on mythbusters on the train turbulance episode. Then ut would messure how much the object pushed on the scale in grams.

[Tim Chen]

Straws will really help a lot with the turbulance. Mythbusters wind tunnel was pretty cool.

It would be sweet if u would put a scale on the back of the object like what they did on mythbusters on the train turbulance episode. Then ut would messure how much the object pushed on the scale in grams.

They did the same thing on "Master Blasters" except they had a guy strapped to the back of a pickup truck and he was holding the fin they were testing against a scale and driving along to get the known wind speed.

I love that show!

[Brian]

thanks. they will help