Re: Team 2526 - Propeller Propulsion Prototype.
 

The maximum tractive force on the wheels is a little over 9 lbs at mu = 0.06. Surface and wheel conditions will alter this somewhat.

If you can provide additional propulsion from thrusters with performance on the order of 3 to 6 pounds, you can have significantly more propulsive force than other bots.

Thrust can be vectored, and control can come from driven wheels. So yes, maybe you're still inside the box. That being said, there are many difficulties as usual but FIRST teams have a way of overcoming those.

This year may provide more than the usual benefit to teams who do the math, validate with prototyping, and take a little more time designing their bot as long as they leave enough time for driver training and testing which will be even more important this year.

Yes, there's no air on the moon but there's no hydrazine thrusters allowed by the rules. So they offset each other ;)

Re: Team 2526 - Propeller Propulsion Prototype.
 

One of the main disadvantages I see to the propeller system is it operates the best on a light robot, but the lighter a robot is the easier it is pushed around. This is especially important in this years competition.

Re: Team 2526 - Propeller Propulsion Prototype.
 

But i think that propellers should give it pretty good handling if they can be turned quickly enough. Perhaps we would be able to avoid collisions? =D

Re: Team 2526 - Propeller Propulsion Prototype.
 

Enough talk, let's see it driving a robot around! :)

Re: Team 2526 - Propeller Propulsion Prototype.
 

Them*

This is just the prototype, we'll need to fix this up and then.. build a whole new one...after that get them linked and make them rotate. Oh and our chassis still doesn't even have wheels.

So maybe we'll get a video of that by the end of week 2 at best.

Re: Team 2526 - Propeller Propulsion Prototype.
 

Here is one
no power except props


http://www.youtube.com/watch?v=FYdPk6jX2n4&eurl=http://www.youtube.com/my_videos_edit2?ns=1&video_id=FYdPk6jX2n4&next=%2F my_videos2%3Fpi%3D0%26ps%3D20iurl=http://i3.ytimg.com/vi/FYdPk6jX2n4/hqdefault.jpg&feature=player_embedded

http://www.youtube.com/watch?v=kQLHfJATBTA&eurl=http://www.youtube.com/my_videos_edit2?ns=1&video_id=kQLHfJATBTA&next=%2F my_videos2%3Fpi%3D0%26ps%3D20iurl=http://i4.ytimg.com/vi/kQLHfJATBTA/hqdefault.jpg&feature=player_embedded


this is just the kit bot chassis with unpowered rover wheels and fans

Re: Team 2526 - Propeller Propulsion Prototype.
 

Now that looks really appealing. What props are you using and what motors and gear ratios?

How do you plan to turn, or was this just a little test?

Re: Team 2526 - Propeller Propulsion Prototype.
 

just a test

Re: Team 2526 - Propeller Propulsion Prototype.
 

??

Re: Team 2526 - Propeller Propulsion Prototype.
 

sry

FP direct drive and prop is 10 x 4.7.

Re: Team 2526 - Propeller Propulsion Prototype.
 

Well that's impressive for being so simple. I'd say you should try a bigger prop and a smaller pitch, because you'll increase thrust and decrease stalling.

Technically, a prop with a pitch of 2 would be ideal, seeing as how it's ideal speed is about 10 mph.. and i don't think you'd want to go faster than that.

Re: Team 2526 - Propeller Propulsion Prototype.
 

I guess 1771 just isnt ready to give away that Xerox Creativity award in Atlanta, are they? Hehe

Very nice job guys, you make the EWCP proud. :cool:

Btw, how much power is that sucking out of your battery? Test it out for 2+ minute runs and let us know..

Re: Team 2526 - Propeller Propulsion Prototype.
 

we did all our testing today on one battery and it never droped below 12 volts

Re: Team 2526 - Propeller Propulsion Prototype.
 

We that makes sense, because running propellers doesn't need that much resistance, making the work load fairly easy on the motors. The trick is gearing it so that you get maximum rpm on the prop while getting the max power output out of the motors. XD

Re: Team 2526 - Propeller Propulsion Prototype.
 

Cool idea but does it have enough force to pull the trailer behind you?