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Unread 23-06-2002, 22:59
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Re: Helicopter propulsion

Posted by Michael Betts at 1/15/2001 9:29 PM EST


Engineer on team #177, Bobcat Robotics, from South Windsor High School and International Fuel Cells.


In Reply to: Re: Helicopter propulsion
Posted by Tom S. on 1/15/2001 6:04 PM EST:



John,

Tom is correct, but this needs further discussion.

First of all, I note that you list your team as a high school with no corporate backing. I assume that this means you have no professional engineers, machinists or mentors on your team.

As mentors, one of our primary jobs is to make sure our students leave the competition with the same number of eyes, fingers and toes as they had at the beginning.

Imagination is wonderful. Think outside of the box and revel in your creativity. BUT, do a reality check before you build!

That said, let's consider your problem.

IF YOU COULD design a helicopter which fits the 30x36x60 package, is made from kit materials and can lift a good payload, a few things need to be true.

1. The blades are hinged and unfold at the beginning.
2. The RPM required would be truly astronomical.

With the possible exception of some frightfully expensive titanium, you lack the space age composite materials to make a strong enough straight blade, much less a hinged one, and when the blades rip loose from your bot, it's not the bot I worry about. It's the hundreds of spectators who will be ripped to shreds.

Regardless of what else might be said, FIRST would never allow anything resembling a helicopter to be used on stage. They would site Rule S6 and never give you the chance to compete.

The reality is that you have less than 2 horsepower of motors available in the kit. You don't have enough power in your motors to airlift your "minimal system" (battery, control, light, et cetera) much less a payload. BUT YOU DO have enough power to cause some major damage to yourself and your friends!

Trust me, if you try and build something on this scale, you, or someone on your team, could be seriously injured.

Mike


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