Team 2526 - Propeller Propulsion Prototype.

[zrop]

Vid:

http://uk.youtube.com/watch?v=Dbi4zbcp3wE

Tell me if you want some specs. or whatnot.

[spc295]

try a condensor fan from an airconditioner, works great

[Nuttyman54]

Have you tested to see if it (or 4 of them) can generate enough force to move your robot?

[GUI]

Have you measured the thrust this produces?

[zrop]

Originally Posted by spc295

try a condensor fan from an airconditioner, works great

If you noticed, those fans remain stationary. Their high pitch allows them to push a lot of air, yet have minimal thrust because of all the stalling. I'm pretty sure it wouldn't be a good idea. We're currently running 12.25 - 3.75 plane props which at meant for maximum thurst.

[zrop]

Originally Posted by GUI

Have you measured the thrust this produces?

Not yet, we haven't had time to make a rig to measure it, or obtain a newton meter for that matter =/

[zrop]

Originally Posted by Akash Rastogi

Can some other team argue that this interferes with their robot's movement? Just curious.

If it has enough thrust to have any effect on your robot, then why not on the robot in front of you?

Anyone?

If you say that, then perhaps bumping into other robots should be illegal?

Anyone?

=P

[Akash Rastogi]

Originally Posted by zrop

If you say that, then perhaps bumping into other robots should be illegal?

Anyone?

=P

Umm that wasn't a hit at your design


It was a serious question.

[zrop]

Originally Posted by Akash Rastogi

Umm that wasn't a hit at your design


It was a serious question.

Yeah i know, but i don't see why it would be any different from physical contact such as bumping and throwing balls at each other.

I mean, it is part of our plan to abuse the fact that we might be able to blow balls away from our trailer, but really, nothings stopping any other team from making a fan, right? =)

[zrop]

Originally Posted by Akash Rastogi

Watch how you respond to posts.....

-.-

Wrong tone? Do i sound bitter or sarcastic or something? Sorry XD

[Neo97]

Originally Posted by zrop

Wrong tone? Do i sound bitter or sarcastic or something? Sorry XD

I think he's mainly referring to the word "abuse." So in other words yeah... I think it's you're tone. In other news your "sorry" seemed pretty much sarcastic with your XD at the end of it lol.

[Akash Rastogi]

Can some other team argue that this interferes with their robot's movement? Just curious.

If it has enough thrust to have any effect on your robot, then why not on the robot in front of you?

Anyone?

[NoahTheBoa]

Originally Posted by Akash Rastogi

Can some other team argue that this interferes with their robot's movement? Just curious.

If it has enough thrust to have any effect on your robot, then why not on the robot in front of you?

Anyone?

You probably could argue that it interferes with your robots movement, but IIRC there's no rule that says interfering with another robots movement is illegal. So, arguing that it interferes with you would be irrelevant.

[Koosley]

Here is the calculator we used to calculate the maximum thrust and size of engine required:
http://personal.osi.hu/fuzesisz/strc_eng/index.htm

As others have said the pitch of the props have no effect on static thrust, only the maximum speed at which the craft will be traveling it, and the pitch have enormous effect on the engine. To other teams attempting this method of propulsion, use the smallest pitch you can find (12.25x3.75 was the smallest we found). It will provide the same thrust and require less power.

Due to a loose belt during our first test run, we couldn't run the prop up to full speed Spinning that blade at 10k rpm according to our calculator (from above) we will get about 6lb of thrust (12lbs total with 2 of them). Is 12 lbs of thrust enough to move the robots?

Our other possibilities for props are using a 28x4 (still havn't found a low pitch prop this big) spinning at much lower speeds to get more thrust. and one more question if anyone knows this, besides requiring more power, is there a reason to use a 2 prop vs a 4prop blade? Using a 4 blade 28x4 prop spinning at 3500 r, according to this calculator (above) would provide nearly 35lbs of thrust

[Racer26]

I seem to recall some theoretical math stating the CIMs driving a wheel on the floor could only generate 9 lbs of thrust, so it might be feasible.