Re: Re: F1D motor tube twist?

From: <RLBailey_at_care4free.net>
Date: Mon, 24 Aug 2009 11:44:25 +0100

If the stick is too small a diameter (less than about 6mm) or made from poor wood, it will twist excessively even if you've sorted out the other potential problems.

Bob


  ----- Original Message -----
  From: Tapio Linkosalo
  To: Indoor_Construction_at_yahoogroups.com
  Sent: Monday, August 24, 2009 11:07 AM
  Subject: Re: [Indoor_Construction] Re: F1D motor tube twist?


    john_kagan wrote:

> In my experience, excessive wing twist is most likely due to problems
> with the wing posts or related connections. It is possible that it is
> due to the motorstick twisting - it will twist, and when done properly
> that's a good thing for the launch. But too much twist is usually caused
> by something else.
>
> Hold the model by the nose and twist it back and forth while looking at
> the various parts. Look for the wing posts shifting in the motor stick
> (loose at the bottom), wing posts bending (loose boron), tissue tubes
> twisting (loose glue joint or lack of diagonal brace), or broken spars
> or wing posts.

  Ok, indeed some boron in the front wing post was loose. Have to glue
  that back on and try again next Saturday. So maybe the twist of the tube
  that I saw (static load of the wound motor on model held of prop and
  front bearing only) was OK,and only the extra twist due to front post
  bending sent the model to the death spiral...? We'll see.

  Thanks for the comment!

  -Tapio-


  
Received on Mon Aug 24 2009 - 03:45:26 CEST