Re: model weight calculation

From: Yuan Kang Lee <ykleetx_at_gmail.com>
Date: Tue, 13 Dec 2011 01:52:36 -0000

Gary,

I looked into discussions that took place on the Yahoo list back in 2003 (the previous one run by Don S.). The discussion dealt with F1D, o-rings, and spacers. Recall that F1D has a 1.2g minimum model weight and a 0.6g maximum rubber weight.

There were two general agreements:

- metal "spacers" that are removable may be considered part of the model weight

- o-rings may be removed from the rubber motor after flight (by cutting the o-rings off or by cutting the cubber), then weighed against the 0.6g limit

However, there was no agreement that o-rings should count as the model weight (even though o-rings do the same thing as a spacer).

Here is a post by Steve Brown, who included a quote by Jim Richmond on this topic:

=============================================
Message: 13060
Date: 08/12/2003 | 09:59:00 AM
From: Steve Brown
Subject: Jim Richmond''s response to the wire spacer question

"The precedent is in outdoor rubber as in F1B. Here, loose metal
parts are always used at the front or back or both to attach/hold the
rubber, and they are weighed as part of the plane, not the motor-
because they are removable. Bobbins and crocket hooks are often used,
and in F!D, you might say the wire spacer is an indoor crocket hook.
As for "O" rings, this was discussed between Doig and Andras Ree and
Ree said "if it's removable, it gets weighed with the plane. If not,
it's weighed with the motor. End of story". I have that in writing
somewhere.

That still doesn't address cutting off "O" rings for after flight
weight check. We need to decide if that will be allowed. Did anyone
actually see this being done in Slanic? Also, my view is that "O"
rings are not part of the plane wieght unless they are removable so
they can be weighed with the plane."

------

So, according to this logic, o-rings are not part of the model weight.

However, most folks (but not all) felt that the o-rings do not have to count toward the motor weight.

From the standpoint of the accepted practice, I have never witnessed nor heard of any instance where any model has been weighed with o-rings to meet the minimum model weight requirement.

===

In terms of motor sleeves -- using the logic from Jim, if the motor sleeve is removable, it can be weighed with the model. But I believe the same logic also requires that one use the exact same two (or one) sleeves on every flight.

Now, from the standpoint of accepted practice, I have also never heard of any instance where the motor sleeve is weighed with the model to meet the minimum model weight requirement.

My *opinion* is that sleeves should not be weighed with the model. It may not be logical, but it is more in line with accepted practice. Again, just my opinion.

===

I hope this helps!

-Kang

--- In Indoor_Construction_at_yahoogroups.com, Warthodson@... wrote:
>
>
> Kang,
> From a practical point of view, perhaps I would agree with you. I am not so sure I agree from a rules interpretation point of view. Who did you check with? What about tube sleeves that slip over the motor? They can be more easily weighed with the model.
> Gary
>
>
>
> -----Original Message-----
> From: Yuan Kang Lee <ykleetx_at_...>
> To: Indoor_Construction <Indoor_Construction_at_yahoogroups.com>
> Sent: Sun, Dec 11, 2011 10:15 pm
> Subject: [Indoor_Construction] Re: model weight calculation
>
>
>
>
> 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
>
Received on Mon Dec 12 2011 - 17:52:37 CET