Helicopter Trial Event

carneyf1d
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Helicopter Trial Event

Post by carneyf1d » July 8th, 2009, 2:31 pm

since helicopter is gonna be a trial event next year, thought id post a new topic for it
anybody got some tips or tricks to get a well flying helicopter?

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Re: Helicopter Trial Event

Post by fmtiger124 » July 8th, 2009, 2:32 pm

I thought it was a Pilot event.....at least thats what it is in New York State
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Re: Helicopter Trial Event

Post by blue cobra » July 8th, 2009, 3:11 pm

I built a "helicopter" yesterday in about fifteen minutes out of some WS parts. COMPLETE FAILURE! Moral of the story: a single puller prop on the top of the MS isn't going to cut it ;)
I do look forward to building some 'copters over the summer and hopefully next season (if my coach lets me do both WS and this [can more than one pair from the same team enter a pilot event?]). Either way I have high hopes for this event and can't wait to see what is made of it! :D
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Re: Helicopter Trial Event

Post by carneyf1d » July 8th, 2009, 6:44 pm

yea. strapping a prop on top of a motor stick wont fly too great lol. you need something to balance out the torque caused by the propeller. I'm gonna build something next week most likely, and ill post some picture/ construction notes from it.

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Re: Helicopter Trial Event

Post by smartkid222 » July 9th, 2009, 2:27 am

fmtiger124 wrote:I thought it was a Pilot event.....at least thats what it is in New York State
it is a pilot event; just excuse carney he's not from NY so it's ok.
blue cobra wrote:I do look forward to building some 'copters over the summer and hopefully next season (if my coach lets me do both WS and this [can more than one pair from the same team enter a pilot event?]). Either way I have high hopes for this event and can't wait to see what is made of it! :D
I look forward to this event too :D
i really do not understand the question. for each team 2 people can enter the event. the people can be from the 15 team members but don't have to.
is this what you were saying?
carneyf1d wrote: I'm gonna build something next week most likely, and ill post some picture/ construction notes from it.
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Re: Helicopter Trial Event

Post by jander14indoor » July 9th, 2009, 3:44 am

Whatever NY is calling it, Helicopter was piloted by OH, MI and I think IN last year. In the SO scheme of things that makes it a national trial event for 2010.

But none of that makes any difference to the rules or competitors unless your state makes a distinction.

As to competitors, rules are like WS, a team of two from your overall team of 15 competes. Doesn't matter which other events they participate in. But at many tournaments (since the scores don't count to team standing), the organizers open Trial/Pilot events to alternates from outside the competitive 15 to allow wider participation. At MI last year we allowed as many two person teams as a school wanted to send.

As to designs, a single rotor can work, but you need something to slow the counter rotation of the motor stick. Look up Wright Bat for one idea.

I suspect, but don't know, that a counter-rotating twin rotor design will be optimum. Max diameter rotors. Build to minimum weight. Look up Jimmy Walker Ceiling Walker for a crude version of this concept.

I've heard many arguments on numbers of blades, but I'm not convinced by theory presented so far on what's best. Gut feel, more blade area is better than less. High aspect ratio (narrow) blades are better than low aspect ratio (wide) blades. So multiple narrow blades on each rotor seems attractive. But I've seen very nice flying designs with twin rotors, two blades each, and they are certainly easy to build.

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Livonia, MI

Have to take some pictures of ideas I've tried and post I guess.

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Re: Helicopter Trial Event

Post by carneyf1d » July 9th, 2009, 12:12 pm

Although im not gonna try this on the first build. do you think this design has a higher potential than most others?
http://picasaweb.google.com/jeffrey.hoo ... 7835332994

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Re: Helicopter Trial Event

Post by jander14indoor » July 9th, 2009, 7:21 pm

Such designs are certainly proven as to basic flight capability, they should be capable of exceeding a minute and a half under SO rules. But...

Ultimately...

I have NO idea. Helicopter is no where near as established an event in AMA indoor free flight as something like Wright Stuff. And that's kind of what makes it interesting.

All us 'experts' can do is point in directions we'd explore. We can get you started with proven, basic concepts that work. Maybe help on methods and practices. Help trouble shoot problems, etc. But I'm not sure we really know what will work best.

Example, most AMA helicopters are double rotor designs like the one in your link and fly in hover mode all the time. But I'm well aware that for full size helicopters hover is a very inefficient mode. Takes much less power to fly while moving horizontally, and that's true even if no horizontal flight surfaces. Is there a way to exploit this for SO size helicopters? Darned if I know, but I look forward to seeing what the students try.

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Re: Helicopter Trial Event

Post by 49ers » July 10th, 2009, 5:57 pm

does it cost much to buy a kit for a helicopter?
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Re: Helicopter Trial Event

Post by jander14indoor » July 11th, 2009, 4:09 am

Not a lot of kits out there, none to SO rules yet. But generally around $20 or less.

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