Dennis
That's a nice looking model! Have you considered using a thrust bearing that would let you remove the prop or use interchangeable props? You can either make a wire bearing that would allow you to do this or use a Harlan Pennyplane bearing. If you use the Harlan bearing you may have to drill out the holes depending on what size prop shaft you use. I use an .020 prop shaft and drill the bearing with an .022 drill. If necessary you can strengthen the front of the bearing by gluing in a tiny wedge of balsa.
----- Original Message -----
From: dennisatyson
To: Indoor_Construction_at_yahoogroups.com
Sent: Monday, November 10, 2008 7:14 AM
Subject: [Indoor_Construction] Re: Science Olympiad Wright Stuff Division B (Middle School) for 2009 ?
I have a design posted over on Indoornews for 2009. It is
called "Parkers Plane." We are getting just over 2 minutes in a 20'
site. Now that Parker has a couple prototypes built we will start
experimenting a little. CG is currently at 90%.
Dennis
--- In Indoor_Construction_at_yahoogroups.com, "Fred or Judy Rash"
<frash_at_...> wrote:
>
> Bill Gowen and All,
>
> Has anyone already designed a Wright Stuff Science Olympiad plane
for Division B or Middle School for this current school year? I can
cobble something up like many of you, but already there may be a good
design available from one or more of you. What is available in plans
or kits for this year's rules? Usually the local middle school that
my kids attended long ago has two kids doing the model aviation event
and usually they are building their first model aircraft.
>
> Wright Stuff seems preferred over Balloon Launch Glider that we did
for two years. The earlier rumor was that Ornithopter would replace
BLG this year.
>
> The specifications that I copied down last week for Wright Stuff
Division B for 2009 were:
>
> 7.0 g minimum airframe weight
>
> 1.5 g maximum rubber weight
>
> 40.0 cm maximum wingspan
>
> 20.0 cm maximum stab span
>
> 6.0 cm maximum stab chord
>
> 20.0 cm maximum prop diameter
>
>
> There is no maximum wing chord but bonus:
>
> +10% if wing chord < 6.5 cm
> +20% if wing chord < 5.5 cm
>
> -10% for incomplete flight log
> -30% for no flight log
>
> I did not copy what constitutes a complete flight log.
>
> Everyone should confirm for themselves that their plane meets all
requirements in case I have copied something incorrectly.
>
> Fred Rash
>
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