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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I'm not sure that rule suggestion is well thought out. How
do you enforce the rule? Now you have to have the competitor disassemble
their plane to show it is full of fuel. How much air in the tank constitutes a
full tank? And the weight of fuel changes with temperature. What
temp are you going to keep the plane to check the weight?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>- Robert Beaubien<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>- NSRCA, District 7 Webmaster<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>-<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>"No trees were harmed in the sending of this message,
however a large number of electrons were terribly inconvenienced."</span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <b>On Behalf Of </b>Derek
Koopowitz<br>
<b>Sent:</b> Wednesday, June 03, 2009 9:53 AM<br>
<b>To:</b> General pattern discussion<br>
<b>Subject:</b> Re: [NSRCA-discussion] Weight<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>Verne,<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>When I was at the CIAM meeting in March one of the proposals
which was passed by the helicopter guys (F3C) was to modify the weight
limit for their helicopters effective 1/1/2010. Here is the new wording:<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>a) WEIGHT:
The weight of the model aircraft (<b>with </b>fuel <b>or </b>batteries)
must not exceed <b>6.5 </b>kg.</span><o:p></o:p></p>
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<p><span style='font-family:"Arial","sans-serif"'>Unanimously approved by the
Plenary Meeting. Effective 01/01/10.<o:p></o:p></span></p>
<p class=MsoNormal>I'm going to feel out the rest of the F3A sub-committee
members to see if there is interest in raising the F3A weight limit to
5.5kg. What does everyone think about this?<o:p></o:p></p>
<p>-Derek<o:p></o:p></p>
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<p class=MsoNormal>On Wed, Jun 3, 2009 at 7:51 AM, <<a
href="mailto:verne@twmi.rr.com">verne@twmi.rr.com</a>> wrote:<o:p></o:p></p>
<p class=MsoNormal>Bill,<br>
I've been working up an AMA rules proposal to address that very issue.
Unfortunately, it won't be up for vote by the contest board anytime soon. In
the meantime, there's one area you didn't mention in the glow to electric
comparison and that's that an electric plane doesn't need as much internal
reinforcement because there's virtually no vibrational effects to contend with
that you do with glow. That equates to lighter airframes being acceptable as
well as small, light, lipo packs to power the Rx and servos. An 8 minute
e-flight typically uses about 50 mah. The same flight in glow is typically 200+
mah. All that aside, most electric pilots will tell you that making weight in
electric is generally a pretty expensive proposition with a limited number of 2
meter planes available that are usually vacuum-bagged composite affairs. In
addition, your best chances for making weight will also necessitate the
lightest and generally most expensive motors and batteries. There are exceptio<br>
ns, and I'm sure we're about to hear about most of them, but I'll be able
to point to just as many examples of guys that fly overweight at local contests
where they know they won't be weighed and the only thing they're really guilty
of is not spending the extra money that the lightest batteries and motors cost.
In every other way, the planes they're flying are the same as the ones they're
competing against. The proposal I'm working on is not self-serving because my
planes make weight, but getting there is both too expensive and unreasonable,
in my opinion. My proposal won't be to allow electric planes to weigh more,
it'll require that they weigh less, but without the "fuel". The
proposal will take into account that electric motors are inherently lighter
than their glow counterparts as well as the reduced structural requirements. It
will limit the mah of permissible packs to control that end of the equation and
there's already a voltage limit on the books which is fine as it<br>
stands. I'm currently doing survey work at the contests I go to to see
where everybody is at weight-wise and will post my proposal on this list soon.
After that, it's up to all concerned to voice their opinions to their
respective Contest Board reps.<br>
<br>
Verne Koester<br>
AMA District 7<br>
Contest Board<o:p></o:p></p>
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<p class=MsoNormal>---- Bill's Email <<a href="mailto:wemodels@cox.net">wemodels@cox.net</a>>
wrote:<br>
> I am certain this has been beaten to death while I was off doing
other<br>
> things, but can anyone explain this:<br>
><br>
><br>
> Rule 4.3: Weight and Size. No model may weigh more than five (5)<br>
> kilograms (11 pounds) gross, but excluding fuel, ready for takeoff.<br>
> Electric models are weighed with batteries.<br>
><br>
> Why can't an electric "deduct" the equivalent of 16 ounces of
fuel?? Is<br>
> a plane without fuel rally "ready for takeoff"??<br>
><br>
> I know it is likely a direct copy of the FAI rule, but it makes no<br>
> logical sense. IC powered planes are weighed without fuel and can weigh<br>
> right at 11 pounds. Add fuel and it could add another 10 to 12 ounces of<br>
> weight. That's OK. But if an electric with batteries weight<br>
> 11.0000000000000001 pounds it is overweight by the rules.<br>
><br>
> Put another way, what does a YS and full fuel weigh compared to a<br>
> motor+ESC+batteries?<br>
><br>
> Hacker C50 14XL = 18.2 ounces<br>
> Hacker Spin 99 ESC = 3.7 ounces<br>
> 10S packs = +/- 43 to 46 ounces<br>
><br>
> Weight w/o batteries = 21.9<br>
> AUW w/batteries = 66.9 ounces<br>
><br>
> YS 1.70 = 33.6 ounces (955 grams)<br>
> AUW with tank and fuel = 45 ounces +/-<br>
><br>
> So I can see an argument that the electrics have a weight advantage<br>
> when it comes to just the motor and ESC. But with "fuel"
electric is at<br>
> a 20 ounce disadvantage.<br>
><br>
> So if I build a plane for electric I need to build it 20 plus ounces<br>
> lighter than if I was going to put a nitro motor in it. How does that<br>
> make sense. I know I am missing something important here, so educate me.<br>
><br>
><br>
><br>
> _______________________________________________<br>
> NSRCA-discussion mailing list<br>
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target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><br>
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