Re: model weight calculation

From: Yuan Kang Lee <ykleetx_at_gmail.com>
Date: Mon, 12 Dec 2011 04:15:43 -0000

I looked into this earlier this year because my model was a little underweight, and I wannted to know if my o-rings could count as part of the model weight.

I think the rules are not clear on this, but the accepted practice is that o-rings do not count toward the model weight. I think this is the right way and we should continue this practice.

Kang

--- In Indoor_Construction_at_yahoogroups.com, Nick Ray <lasray@...> wrote:
>toward
> Wire spacers, when used on a F1D are considered to be part of the model
> weight. As for O-rings, they are normally counted towards the rubber
> weight. However, they can be cut off the motor as needed after the flight
> to meet a maximum motor weight.
>
> I would personally define anything that stays affixed to the model as part
> of the model weight and anything that is not left on the model when the
> rubber is removed as part of the rubber weight. I would think the tubbing
> sleeves would fall into the same category as o-rings because they help
> handle the rubber. However, I could see an argument for calling them a
> structural element since they are a mechanism for preventing the rubber
> from bunching at the hooks.
>
> It will be interesting to hear what the list has to say because if tubing
> sleeves are ruled a rubber control mechanism then they would be illegal for
> Ministick, A-6 and LPP.
>
> Nicholas Ray
>
> On Sun, Dec 11, 2011 at 10:07 PM, Segundo Zarate
> <segundo.zarate_at_...>wrote:
>
> > **
> >
> >
> > Clearly the "O" rings and sleeves do not contribute to the energy from
> > the wound rubber and should be therefore be part of the model dry
> > weight IMO. However in P-30 and other outdoor events the rubber lube
> > is part of the maximum allowed motor weight (?).
> >
> > Ding Zarate
> >
> >
> > On 12/11/11, Warthodson_at_... <Warthodson@...> wrote:
> > >
> > > When a model classification has a minimum weight limitation can devices
> > that
> > > are attached to the rubber motor but do not provide any actual power
> > such as
> > > "O" rings that are used to connect the motor to the prop hook or rear
> > hook
> > > be included in the models total weight? This question would also apply to
> > > devices such as "tubes" or short pieces of plastic straws that are slid
> > over
> > > the motor to prevent the motor from bunching up at the front or rear
> > hook. I
> > > know this has been discussed before but I don't recall the consensus.
> > > If they can be counted in the total weight, can identical "O" rings be
> > used
> > > for weight purposes or do they need to be cut off the motor & weighed?
> > > Gary Hodson
> > >
> >
> > --
> > *Long live Free Flight!*
> > *
> > *
> > *Ding Zarate*
> >
> >
> >
>
Received on Sun Dec 11 2011 - 20:15:45 CET