Alt-BEAM Archive
Message #10442
To: beam@sgiblab.sgi.com
From: "Timothy Flytch" flytch@hotmail.com
Date: Fri, 18 Feb 2000 22:38:56 PST
Subject: [alt-beam] Re: solarbotics pager mtr+fan
>At 07:18 PM 2/18/00 , Timothy Flytch wrote:
>>The main reason for opposite spin on a two rotor helicopter is blade
>>interference... if they are spinning the same direction than you can't
>>overlap them... for fear of blade strike... but other wise it does not
>>matter...
>>Timothy...
>
>The 2nd benefit is that the torque (twisting force) cancels out, hence no
>need for a tail rotor.
>
>-Dave
Only if the axels or coaxial... if you separate the blades then you do not
have to use counter rotating blades to counter act tork... you use an
offset or tilt of the blade disk to counter tork...
Timothy...
______________________________________________________
10443 Saturday, 19 February 2000 5:29 Re: electric helicopters are getting close... beam@sgiblab.sgi.com Jean auBois
>At 05:01 PM 2/18/00 -0800, Timothy wrote:
>>Take a look at this sight... I have recently read were an electric R/C
>>helicopter has flown non stop for over one hour!!! and they just keep
>>getting smaller...
>>http://www.micro-flight.com/
>
>The kit looks very nice and the price seems within reason... but it doesn't
>include a lot of things. For example:
>
>>REQUIRES (See Note)
>>
>>4-Channel Transmitter
>>
>>Micro Receiver
>> 2
>> Micro Servos
>>
>>Micro Piezo Gyro
>
>The first three items aren't ghastly expensive, but how many "micro piezo
>gyros" have you seen for sale? In any case, one must remember that
>helicopters are difficult beasts to fly under the best of circumstances --
>I'm not sure that BEAM technology would be "smart" enough (unless it was
>one of Mr. Rigter's circuits... )
>
>However... the gyro itself might be a Really Neat Thing for BEAM work if
>they didn't cost from 56 to 298 pounds (say $90 to $475 American) and,
>although quite sophisticated, are only good for one axis (yaw for the
>helicopter case). Awfully pricey, but interesting.
>
>
>jab
>
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