Best battery choice? + Current Draw used per flight

Wed Apr 16 06:34:45 AKDT 2003

Hi John,
Linking the ailerons on a plug-in ship will be tough without funnies due to wing wiggle.
You're right, running the linkage close to the tube will help, but it still won't be easy.
Let us know if you come up with somnething.
Dean

-----Original Message-----
From: John Gayer [mailto:jgghome at earthlink.net]
Sent: Tuesday, April 15, 2003 11:46 PM
To: discussion at nsrca.org
Subject: Re: Best battery choice? + Current Draw used per flight

Thanks, Dean, for the explanation.
I was thinking of the vertical force from the piston rather than the 
rotational impulse.
One of the problems we always had trying to use a single servo was 
getting a solid slop-free linkage. Perhaps if the linkage were run 
adjacent to the wing tube the wiggle would be reduced.
John

Dean Pappas wrote:
> Hi John,
> The dominant vibration impulses from the engine are in roll. That's the direction

  your soft-mounted engine shakes in. Every time the engine fires, the 
right wingtip

  "bangs" upward and the left downward. You'll remember a day or three 
ago that Eric

  noted that the right aileron servo gets beaten up worse than the left 
one.

That's gravity's fault.
> Coupling the ailerons would still be a great idea because the air loads 

are in phase from side to side. One piece wings might be a necessity, 
because

  plug-ins wiggle with respect to each other.
> Regards,
> 	Dean
> 
> -----Original Message-----
> From: John Gayer [mailto:jgghome at earthlink.net]
> Sent: Monday, April 14, 2003 10:18 PM
> To: discussion at nsrca.org
> Subject: Re: Best battery choice? + Current Draw used per flight
> 
> 
> I would think the driving function on each aileron would be in phase. If 
> that is so, then coupling the ailerons together would help a lot. Seems 
> like it might be worth a try.
> 
> John Gayer
> 
> Dean Pappas wrote:
> 
>>Hi Jim,
>>I like that! Frack and I discussed this back when the S9303 came out, 'cause we figured that finally we had one servo with adequate torque to do the job. It still does nothing for the vibration problem: one wing shakes up as the other goes down, but the "G" related load problem evaporates. That one will require second-moment balancing.
>>Dean
>>
>>-----Original Message-----
>>From: JOddino [mailto:JOddino at socal.rr.com]
>>Sent: Monday, April 14, 2003 2:52 PM
>>To: discussion at nsrca.org
>>Subject: Re: Best battery choice? + Current Draw used per flight
>>
>>
>>How about Hanson's idea of going back to connecting the ailerons together
>>through bellcranks like we did in the old days?
>>Jim
>>----- Original Message -----
>>From: "Dean Pappas" <d.pappas at kodeos.com>
>>To: <discussion at nsrca.org>
>>Sent: Monday, April 14, 2003 11:06 AM
>>Subject: RE: Best battery choice? + Current Draw used per flight
>>
>>
>>Yes, I have considered mass balances on the ailerons.
>>I just refuse to leave dangly-things under the wing, in order to do it.
>>If i ever come up with a set of mechanics I really like, you will see it.
>>Regards to all,
>>Dean
>>
>>-----Original Message-----
>>From: GREEN, DOUG [mailto:doug.green at bell.ca]
>>Sent: Monday, April 14, 2003 1:36 PM
>>To: discussion at nsrca.org
>>Subject: Re: Best battery choice? + Current Draw used per flight
>>
>>
>>Have you considered weight balancing your control surfaces to reduce the
>>punishment being inflicted on the servos?
>>
>>Doug
>>
>>Dean Pappas wrote:
>>
>>
>>>Hi Brian,
>>>3 Amps while the mount and possibly airframe are in sesonance is not out
>>
>>of the question.
>>
>>
>>>What is the W.O.T. current draw? By the way, at idle-shake, the ailerons
>>
>>are the big draw culprits.
>>
>>
>>>Dean
>>>
>>>-----Original Message-----
>>>From: Brian Young [mailto:b4598070 at yahoo.com]
>>>Sent: Monday, April 14, 2003 9:10 AM
>>>To: discussion at nsrca.org
>>>Subject: RE: Best battery choice? + Current Draw used per flight
>>>
>>>I found I wasnt getting the capacity I thought I
>>>should w/ my 1800 mah 6 cell flight pack. After two
>>>masters sequences I recharged and put back in 600mah
>>>(triton charger), pack was topped up prior to flight.
>>>
>>>So back home, I put a current meter between the
>>>battery and receiver. I draw about 90 mA with all
>>>servos connected, each servo unplugged the total drops
>>>by 15 mA, except for the throttle which drops 10 mA.
>>>Wiggle the sticks and I can occasionally get over 300
>>>mah. This didnt seem unusual to me, anyone disagree?
>>>
>>>So I left the meter in place and started the plane, at
>>>idle the meter was reading 3 Amps, yep 3. Has anyone
>>>else done this?
>>>
>>>I move the trottle off idle a little and the current
>>>drops to about 2-2.5 Amps, so my throttle servo is
>>>bottoming a bit.
>>>
>>>3 Amps in this gauge wire seems like it should be
>>>getting something hot, but I hooked the multimeter up
>>>in series with my battery just like I learned in
>>>school.
>>>
>>>The servos are all digital JRs with over one season
>>>use, except I did replace the Aileron servos w/ new
>>>yesterday but havent had a chance to repeat my test.
>>>All thoughts on what could be causing this are
>>>appreciated. Otherwise a 4000 mah flight pack is
>>>looking good to me. Is there any reason a worn servo
>>>would draw more current?
>>>
>>>Thanks.,
>>>
>>>--- Dean Pappas <d.pappas at kodeos.com> wrote:
>>>
>>>
>>>>There are plenty of us nicad stalwarts!
>>>>Mark, I agree with your reliability/convenience
>>>>assessment.
>>>>My 5-cell SR 1000 mAH is good for better than 5
>>>>flights, as I have
>>>>repeatedly measured the consumption of a
>>>>all-digitals practice flight at 145 mAH.
>>>>I'm considering going to a 500 pack and after every
>>>>flight top-ups with the Sirius.
>>>>That gets the weight to the point where any
>>>>disadvantage to the nicad is, in my opinion,
>>>>greatly outweighed by their reliability.
>>>>
>>>>Dean pappas
>>>>
>>>>-----Original Message-----
>>>>From: Atwood, Mark [mailto:atwoodm at paragon-inc.com]
>>>>Sent: Friday, April 11, 2003 10:22 AM
>>>>To: discussion at nsrca.org
>>>>Subject: RE: Best battery choice?
>>>>
>>>>
>>>>Lol....ok Anthony...then there's two of us flying
>>>>Nicads.  I use some of the newer technologies for my
>>>>electrics, but with regard to Pattern, the new
>>>>batteries appear to fix problems I don't have.  I
>>>>run a 5cell 6v 1400mah nicad pack.  I personally
>>>>haven't heard an argument that even comes close to
>>>>making me want to change.
>>>>Cost/reliability/convenience all seem to favor
>>>>Nicads.  The only one against it is weight.  And
>>>
>>>>from my perspective, if I need that ounce...I have
>>>
>>>>bigger problems.   Just my .02...I'd love to hear
>>>>others opinions on the subject...
>>>>
>>>>mark
>>>>
>>>>-----Original Message-----
>>>>From:         AAbdu at aol.com [mailto:AAbdu at aol.com]
>>>>Sent: Friday, April 11, 2003 10:00 AM
>>>>To:   discussion at nsrca.org
>>>>Subject:      Best battery choice?
>>>>
>>>>It seems like every month a new battery technology
>>>>is introduced. NiMh, Lithium ion, NiCad etc. Each
>>>>one claiming to be better than the last. It seems
>>>>like I am the last pattern flyer still using old
>>>>familiar, heavy, memory burdoned NiCads. I am
>>>>considering investing in updated batteries and all
>>>>of the other things needed to maintain them. I have
>>>>accepted that I will need not only the battery, but
>>>>a new charger, regulator, and all the other fixins.
>>>>Given that condition, what is the latest info pro
>>>>and con on the new battery technology. I know there
>>>>was an availability issue with the duralites that
>>>>has seemed to be resolved, then I remembered hearing
>>>>something about them overheating or blowing up or
>>>>spontaneously combusting or something. My point is,
>>>>there is a lot of misinformation out there and I am
>>>>trying to find out what works best from those who
>>>>use it.
>>>>In order of importance of features:
>>>>1. Reliability
>>>>2. Weight (lighter is better)
>>>>3. Capacity, can I get 5 flights on them, can they
>>>>be quick  charged?
>>>>4. Durability / margin of error / expected life
>>>>span. If I leave the RX on do I have to replace
>>>>them?
>>>>5. Price
>>>>6. Availibility
>>>>
>>>>I appreciate any information you guys can provide.
>>>>Thank you.
>>>>Anthony
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>>>
>>>=====
>>>Brian Young
>>>Tulsa
>>>b4598070 at yahoo.com
>>>918-745-6046h
>>>918-838-0900w
>>>
>>>__________________________________________________
>>>Do you Yahoo!?
>>>Yahoo! Tax Center - File online, calculators, forms, and more
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