UpForce

[Frank(Aflak)]

Originally Posted by gc02

There's a rule of thumb that says you need 1 hp to produce 2.5 lb of thrust, so you'd need at least 52 hp to lift 130 lb.

You might get that out of an extremely strecthed elastic tubing for a few seconds. Long enough to get to the bar.

And you might get added boost from the ground effect, also.

[Guyute]

i think in 2 or 3 weeks we will have pictures and cad designs for people to see...

[fox46]

I'm into model helicopters and airplanes- think of this a standard model helicopter with a .30ci engine weighs about 5lbs, with a 1060mm diameter rotor. The .30ci glow engine produces at peak output, 2hp. The two drill motors combined produce 720Watts. There is 750 Watts in one horsepower. Now to compensate for the differences in electric power ratings vs gas power ratings, let's give the drill motors the benefit of the doubt, and multiply their power output by three. So to recap, the 5lb helicopter produces 2hp to lift itself, and the robot can produce a little less than 3 hp with two drill motors. So the chances that the robot could even come close to lifting it's 15lb batter is very slim (impossible).

[Frank(Aflak)]

Originally Posted by fox46

I'm into model helicopters and airplanes- think of this a standard model helicopter with a .30ci engine weighs about 5lbs, with a 1060mm diameter rotor. The .30ci glow engine produces at peak output, 2hp. The two drill motors combined produce 720Watts. There is 750 Watts in one horsepower. Now to compensate for the differences in electric power ratings vs gas power ratings, let's give the drill motors the benefit of the doubt, and multiply their power output by three. So to recap, the 5lb helicopter produces 2hp to lift itself, and the robot can produce a little less than 3 hp with two drill motors. So the chances that the robot could even come close to lifting it's 15lb batter is very slim (impossible).

Yes, but as mentioned above if you start the match with a rotor all wound up with the elastic tubing to near-breaking amounts, say four independant starnds of it so you have max tension of the elastic tubingx4 driving your rotor, at least for a few seconds, you may be able to get off the ground.


I'm just doubting whether or not you could control yourself well enough to get to the bar.

[maxgebhardt]

well I belive they removed the restriction on springs this year, so maybe elastic tubing is ok, but a custom spring could be wound before hand. the problem is
#1, winding it. you'd need a big lever, a sturdy frame, something to hold the robot in place (drill into the georgia dome floor?) and some strong kids.
#2 stopping it from going off instantly, so some sort of arresting mecanism.
#3some type of counter rotation mechanism, like the boom on a helocopter.
#4 a really good driver to get it in place perfectly.
#5 a light system.
also have you thought of using a compressor to hold air, then to turn a turbine, thus turning a shaft? also they mention "safe" alot, and a robot which when broken could litter the crowd with metal spinning at high velocity could be impounded, not by the inpectors, but by the government as some type of deadly flying bomb...

and while I'm dreaming... what about orienting the robot to start on its nose and let it fall down, leaving 60" for the boom and prop, while making it be 36" high.