There are stiffness testers for motorsticks, and guys on the west coast
maximizing EZB's have been doing it for years.
The idea is not to make one motor stick, but to make a dozen or more, fat,
skinny, high density, low density, and test them all for twist. Some have said
that a 9# MS for a ministick was the best they ever had, on a strength to weight
ratio.
Others use their fingers. I am an engineer.
Plans for one are in the 2002-2004 W.I.D by Palrang. Page attached. Pretty self
explanatory, but I could provide measurements if needed. Make longer for LPP,
shorter for Ministick or PP. The stick is 1" x 1" x 16" basswood, the base is
3/4" x 2 1/2" pine. The dial is mounted on a semicircle of 1/16" hard balsa.
Mine has peg holes for all sizes. I made a set of "calibrated " fishing weights
a while back, exactly 1/4 oz, 1/2 oz, etc. Just use what works.
Mike Palrang rules.
There are no secrets.
Carl Bakay
________________________________
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
>
- application/x-ygp-stripped attachment: stored
Received on Sat Mar 05 2011 - 16:13:02 CET