Re: Re: Per the '10-'11 AMA rules for LPP

From: Carl Bakay <carl.bakay_at_yahoo.com>
Date: Sat, 5 Mar 2011 17:59:49 -0800 (PST)

I would say the Pro/Am was the best thing to happen to Indoor since Jim Clem and
his Condor P-24, Slusarczyk and his profile models, and McGillivary with his WW
I scale models.


We had ten teams in 2010, and all of the amateurs had nothing but praise for the
event. Not only did it advance their LPP winding, flying and trimming skills a
few years in a single day, but taught skills that apply to all events. So many
said, "I'll be back." If you read Kagan in his Model Airplane News column, his
enthusiasm is infectious. It also doesn't hurt to have a world-class backround
to bring to the writing and teaching.

I feel that often we hear about VP and VD props, unobtanium bracing materials,
dollar-a-gram rubber, and forget about the fun of gluing sticks together,
winding it up, and letting it go.

Carl




________________________________
From: leop12345 <leop_at_lyradev.com>
To: Indoor_Construction_at_yahoogroups.com
Sent: Sat, March 5, 2011 12:49:56 PM
Subject: [Indoor_Construction] Re: Per the '10-'11 AMA rules for LPP

  
The LPP class has become more sophisicated as the years roll by and even more so
lately with the Pro/Am event at the USIC. To build an LPP capable of over 16
minutes Johnson City and over 18 minutes at LH takes some careful design and
serious consideration of the weight budget.

With full wind torques often well over 1.0 oz-in, there are great stresses on
the motorstick. And the resulting motorstick twist puts great stresses on the
wingposts and the wing spars. The best LPP's have litte or no ballast because
the builders use all the weight allowed to build stiffer parts as they develop
their initial designs and determine the optimum cg location, etc.

A 5/16" by 1/4" solid motorstick may look like part off of a battleship but even
a motorstick of that size can bend too much if not well built out of good balsa.
Even wing spars fabricated from super stiff carbon rods or out of balsa with
boron fiber reinforcement can flex enough to cause a wing to tuck after a high
torque launch or in a dive (after a ceiling or girder bump) if the design of the
spar and wing is not correct.

So, even though many people consider LPP's to be big fat ugly ducks, they can be
quite beautiful swans.

Leo
Bloomington IN

--- In Indoor_Construction_at_yahoogroups.com, "Don DeLoach" <ddeloach_at_...> wrote:
>
> A battleship.that's an excellent analog!
>
>
>
> Don D
>
>
>
> _____
>
> From: Indoor_Construction_at_yahoogroups.com
> [mailto:Indoor_Construction_at_yahoogroups.com] On Behalf Of Ed
> Sent: Saturday, March 05, 2011 7:29 AM
> To: Indoor_Construction_at_yahoogroups.com
> Subject: RE: [Indoor_Construction] Per the '10-'11 AMA rules for LPP
>
>
>
>
>
>
> Don, Thanks again. I think it was a stupid question to start with. LPP's are
> built like a battleship!
>
> Ed
>
>
>
> -------Original Message-------
>
>
>
> From: Don <mailto:ddeloach_at_...> DeLoach
>
> Date: 3/4/2011 9:12:18 PM
>
> To: Indoor_Construction_at_yahoogroups.com
>
> Subject: RE: [Indoor_Construction] Per the '10-'11 AMA rules for LPP
>
>
>
> Ed
>
> LPP does not allow anything but a solid piece of wood for the motorstick. No
> bracing, boron, carbon, or rolled tubes.
>
>
>
> Don DeLoach
>
> Editor, NFFS Free Flight Digest
>
>
>
>
>
> _____
>
> From: Indoor_Construction_at_yahoogroups.com
> [mailto:Indoor_Construction_at_yahoogroups.com] On Behalf Of Edward
> Sent: Friday, March 04, 2011 3:05 PM
> To: Indoor_Construction_at_yahoogroups.com
> Subject: [Indoor_Construction] Per the '10-'11 AMA rules for LPP
>
>
>
>
>
> Sec; 21.3.6; "No gadgets of any kind are permitted on the model" Does this
> mean no boron or bracing wires? Rules only mention VP props etc. There is NO
> mention of Boron or Bracing wires. Does this mean it's of to use them OR
> does NO GADGETS mean NOTHING BUT WOOD !!!
> Ed Berton
> Brevard,NC
>


 


      
Received on Sat Mar 05 2011 - 17:59:50 CET