>You might want to consider increasing the wingrod size.
I am. The 1/4" size was chosen for weight considerations, and at best it
was a "conservative" (read:marginal) choice. I will use 5/16".
On my BoT-to-be, I used a 5/16" wingrod and strengthened the spar with
carbon fiber, end-grain balsa webs and Kevlar wrap. From calculations, I
estimate that these changes increased the winch load from about 20 pounds to
80 pounds.
Thie in my "Phase II" KillerBoT (Phase I being dead stock). Eventually I
will have a Phase X KillerBoT that will take full-pedal zoom launches, float
like a butterfly and sting like a bee, as well as be nice to children and
dogs. Hopefully my flying skills will catch up to the toy... :)
--Bill
>From: [EMAIL PROTECTED]
>To: [EMAIL PROTECTED]
>CC: [EMAIL PROTECTED]
>Subject: Re: [RCSE] spar-sizing calculations
>Date: Wed, 8 Aug 2001 19:26:12 EDT
>
>Bill,
> You might want to consider increasing the wingrod size. With my BOT,
>116"
>with the increased spar buildup, I'm having a lot of trouble with my zoom
>launches. The .25" wingrod just won't take it. I've bent the one that
>come
>with it a few times, (10")and straightened it. I went to a stainless steel
>one 12" long, two launches and it was bent. Now this week I am trying a
>.25"
>music wire rod to see if it will spring back on it own.
>
> Thermals
> Jerry Miller
> SOSS-Medford, OR
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