Re: Re: Possibly interesting balsa test

From: Bill Gowen <b.gowen_at_earthlink.net>
Date: Thu, 29 Jun 2006 23:43:07 -0400

Yes and Mark has made similar statements in the past. The interesting idea to me is to use a round MS for a low ceiling model. This could give more tailplane deflection for controlling the rate of climb without getting more stab and wing twist.

For low ceiling models I usually use rectangular prop spars with the taller side perpendicular to the blade. this allows more flaring. Larry Coslick describes this in his Micro B article.

  ----- Original Message -----
  From: izgo
  To: Indoor_Construction_at_yahoogroups.com
  Sent: Thursday, June 29, 2006 10:58 PM
  Subject: [Indoor_Construction] Re: Possibly interesting balsa test



  Hello Bill.

  Thanks for sharing tests

> I rotated the piece a number of times to see if it
> was stronger depending on the grain orientation.
> The maximum difference in deflection from the best
> position to the worst position was about 1/16".
> This was also unexpected.

  A few days ago I was asking about this, to know if the rounded prop
  spars has to be oriented in some particular grain orientation. Akihiro
  Danjo said: "I think there will be NO difference, though I use A-grain."

  So your test is in concordance with Akihiro thougts, because flexion
  will be almost the same regardless the grain orientation.

  Ignacio.



   

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Received on Thu Jun 29 2006 - 20:43:13 CEST