Electric Weight: with or without batteries at US Nationals

[Jim_Woodward at beaerospace.com]

Hi Richard,

I will be maidening it tomorrow, or Sunday depending the weather here 
(tropical storm).  I set the speed controller with the brake off.  On the 
Futaba 9WCII, I set the idle on the left slider.  I'm anticipating moving 
the slider up for flight, I was thinking around 300-500 rpms for idle. I'm 
looking forward to flying it this weekend.  The Hacker C50 14 XL produces 
tons of power on the ground. 

Jim





"Richard Strickland" <richard.s at allied-callaway.com> 
Sent by: discussion-request at nsrca.org
06/10/2005 11:30 AM
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Re: Electric Weight: with or without batteries at US Nationals






Jim, I'm at 11-2.5+/-(gotta get a better scale) using pretty standard 
stuff--but Kokam 3200s(not quite enough capacity--but close), I can gain a 
bit with a ni-mah? or lipo rec. pack and I've got an ancient Fut. pcm rec. 
in it that could be upgraded--plus the items you mentioned.  But as I've 
mentioned--the wing panels weigh a ton--they were like 14.5 oz out of the 
box ea.   9151s all around and seem to work well--thrown my timing off a 
little as they are even a little slower than the 9150s and quite a bit 
slower than the 9154s in the Temp.  Got about 15 flights and sorting 
rates, throws, expo, cg, rigging, etc.--probably NOT the thing to do two 
weeks before our local contest!   It seems a little 'dancy' in rough air 
(that's all I've had since flt. 1), but I'm hesitant to mess with it TOO 
much as it knife-edged with no coupling(s) right off both ways.  The 
torquey? servos might account for some of it as I may have been getting a 
little blow-back--absorbing some of my input(s) on others--or possibly I'm 
chasing things a bit.  More time needed.   Where are you setting your 
idle?--if I set it where it will staying running all the way through the 
flight--then it's too fast for downlines--too low and it stops altogether 
at times.  Does that match your experience--or do we turn off the brake? I 
know it's a 'wide-body'--but it's clean!
 
Richard
----- Original Message ----- 
From: Jim_Woodward at beaerospace.com 
To: discussion at nsrca.org 
Sent: Friday, June 10, 2005 8:48 AM
Subject: Re: Electric Weight: with or without batteries at US Nationals


RS - Although I have taken GREAT care with the airframe weight of the 
Impact, I have used a non-exotic equipment list, so I am at 11 lbs, 4.5 oz 
with 6000 mah TP packs (2, 5S,3P).  I did not use aluminum wheel axles, 
nor replace the wheel pants, nor replace the heavy wing tube.  Also, I 
used the Futaba 9152 monster servo for the rudder.  Also, I'm using the 
stock steel prop nut and spinner jam nut.  So, I used very standard 
equipment, and still came close to making the weight.  A quick solution is 
to purchase (if available), the 5300 mah packs, which in itself drops 4-5 
oz I've heard.  Dropping even 5 oz may be possible just with some 
equipment changes.  The airframe really not going to get any lighter, 
except some more trimming of the chin cowl flanges.  I'm happy with the 
build and got close to the weight limit with a very standard equipment 
set.  Also, using the 2 cell Li-ion, 2200 mah battery. 

I've heard that they may change the electric weighing procedures such that 
the battery is removed at this years nats, but looking for confirmation 
before I spend a bunch more cash. 

Thanks, 
Jim 

James Woodward
Program Manager
B/E Aerospace Business Jet Group - Miami
9100 N.W. 105th Circle
Miami, FL 33178
(305) 459-7155  Office
(305) 459-7185  Fax
(954) 319-0873  Cellular 


"Richard Strickland" <richard.s at allied-callaway.com> 
Sent by: discussion-request at nsrca.org 
06/10/2005 09:31 AM 

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ALUMINUM servo screws?  Man, you must REALLY be close!?! 
  
RS 
----- Original Message ----- 
From: Jim_Woodward at beaerospace.com 
To: discussion at nsrca.org 
Sent: Friday, June 10, 2005 7:56 AM 
Subject: Electric Weight: with or without batteries at UN Nationals 


Hi All, 

Does anyone happen to know what the weighing policy will be for electric 
planes at the nats (with or without batteries)? 

Also - does anyone know the source for aluminum servo screws? 

Thanks, 
Jim W. 

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