[NSRCA-discussion] cost of electric
Del K. Rykert
drykert2 at rochester.rr.com
Mon Sep 18 09:11:35 AKDT 2006
I am guessing that density altitude may have a factor for some also? Don't know but it would make sense to me..
Del
----- Original Message -----
From: DaveL322 at comcast.net
To: NSRCA Mailing List
Sent: Monday, September 18, 2006 12:41 PM
Subject: Re: [NSRCA-discussion] cost of electric
The whole watts per lb idea is a very quick and dirty approximation method - which doesn't mean it can't be useful, but other variables can seriously affect the performance -
- desired vertical / thrust
- desired airspeed / pitchspeed
- drag of airframe
- efficiency of ESC and motor
I've flown F3A on 1600 watts in a 10 lb plane, and the vertical was unlimited, but the top speed of the plane was very slow, and close to full throttle was needed to lock in for rolling maneuvers. Not a practical setup, and not flyable in wind. Trading vertical (thrust) for airspeed (pitchspeed), you can have plenty of power for moderate sized loops, and enough speed to be able to cruise at a reduced power setting.
Regards,
Dave Lockhart
DaveL322 at comcast.net
-------------- Original message --------------
From: "Fred Huber" <fhhuber at clearwire.com>
> Watts per pound is a very good indicator of electric model preformance
> regardless of size.
>
> 100 watts per pound is appx equal to 1:1 power:weight.
>
> Thus, we can be compareing "apples to apples" regardless of the size
> difference.
>
> Intermediate.. I would "reprop" the Quest to appx 1000 watts. (the power
> system is capable of it.. its just a bit harder on the batteries.) I have a
> 13X6.5 on the motor, and its rated for a 14X8 (for appx 1200 watts) on the
> batteries I am using.
>
> I made the prop choice to get 15+ min per charge "sport" flying the model.
> Its closer to 11 min doing the Pattern. Repropping for more power. My
> reading indicates that if you want ! the LiP os to last, you want 15 min
> capacity.
>
> **********
>
> And... the main reason I responded to the topic was...
>
> >>>>> Wow, That is a bit out of my price range!
>
> Maybe the lesser performance of a system that is sized for a bit lower
> power:weight would meet his needs... Entry level (Sportsman) Pattern need
> not cost a couple of thousand $$$$. a common 4 ch basic radio and an ARF
> similar to the Quest is a good plan... for that level. (a much better plan
> than some other planes I tried...)
>
> Being able to get the WHOLE PACKAGE in the air electric powered, with the
> charger and even including the RC system for appx $1000 may make a
> difference.
>
> ********
>
> BTW.. there's a power package (motor, batt and ESC) which would have been
> appropriate to the Quest, (or other .90 size, light, low cos! t Patte rn/3D
> ARF's) For Sportsman level (rated for 900 watts max on the motor and ESC)
> which costs $150 less than the power packge I set up. But.. You can't
> re-prop it up for Intermediate...
>
> ----- Original Message -----
> From: "Scott Anderson"
> To: "NSRCA Mailing List"
> Sent: Sunday, September 17, 2006 8:47 PM
> Subject: Re: [NSRCA-discussion] cost of electric
>
>
> >I believe the Quest is a small plane (Specifications:)
> > Wingspan: 68.5"
> > Wing Area: 1000 sq. in.
> > Ready-to-fly weight: 7.5 - 8.5 lbs.
> > Length: 69"
> >
> > We are not doing a even comparison to a 2 meter plane..
> >
> > I fly intermediate and will be moving to advanced next year and its still
> > nice to have extra power...
> >
> >
> > Scot! t Ander son
> >
> >
> >
> > ----- Original Message -----
> > From: "paul.horan"
> > To: "NSRCA Mailing List"
> > Sent: Sunday, September 17, 2006 9:35 PM
> > Subject: Re: [NSRCA-discussion] cost of electric
> >
> >
> >> Scott,
> >> I have seen Fred's Quest fly - it is electric and it is more than
> >> sufficient for sportsman and the beginning of intermediate.
> >> I believe he is correct in his statement.
> >> Thanks,
> >> Paul
> >>
> >> ----- Original Message -----
> >> From: "Scott Anderson"
> >> To: "NSRCA Mailing List"
> >> Sent: Sunday, September 17, 2006 8:17 PM
> >> Subject: Re: [NSRCA-discussion] cost of electri! c
& gt; >>
> >>
> >>> Fred,
> >>>
> >>> 100 watts per pound is marginal for pattern..
> >>>
> >>> And I don"t fly Masters !
> >>>
> >>> Just my 2 cents..
> >>>
> >>> Scott Anderson
> >>> Team Tanicpacks.com
> >>> Team Castle Creations
> >>>
> >>>
> >>> ----- Original Message -----
> >>> From: "Fred Huber"
> >>> To:
> >>> Sent: Sunday, September 17, 2006 9:12 PM
> >>> Subject: Re: [NSRCA-discussion] cost of electric
> >>>
> >>>
> >>>> The costs they listed are for a plane competitive at Masters or above.
> >>>> Sportsman simply doesn't require the same p! erforma nce from the model.
> >>>> (each
> >>>> successive level demands more from the plane and pilot)
> >>>>
> >>>> Sportsman (flying the schedule used the past couple of years) level
> >>>> needs
> >>>> appx 100 watts/ lb and you can get a decent e-power plane set up for
> >>>> close
> >>>> to half the cost. (probably less, as prices are comming down)
> >>>>
> >>>> It depends on the performance level you want or need. I believe the
> >>>> setup
> >>>> Nat recommends approaches 200 or 250 watts/lb in an 11 lb plane...
> >>>> Desireable for the HUGE verticals with rolls on up lines at Masters and
> >>>> FAI
> >>>> level.
> >>>>
> >>>> *************
> >>! ;>&g t;
> >>>> BEST is to charge the LiPos at no faster than 1C rate... so it takes 1
> >>>> hr
> >>>> for a fully depleted pack.
> >>>>
> >>>> don't forget to get a cell ballancer, and a Wattmeter. Adds appx $75
> >>>> to
> >>>> the
> >>>> bill. ($25 for Astro Blinkey... and $50 for the wattmeter).. but the
> >>>> ballancer increases the life of the LiPos, (and makes charging safer)
> >>>> and
> >>>> the wattmeter allows you to test the power draw with assorted props, to
> >>>> ensure you aren't overloading something.
> >>>>
> >>>> ----- Original Message -----
> >>>> From: "Kelly Regan"
> >>>> To: "NSRCA Mailing List" > & gt;>>> Sent: Sunday, September 17, 2006 7:44 PM
> >>>> Subject: Re: [NSRCA-discussion] cost of electric
> >>>>
> >>>>
> >>>>> Wow, That is a bit out of my price range!
> >>>>> My Brio on gas idea is looking better! ;)
> >>>>>
> >>>>>
> >>>>>
> >>>>> Nat Penton wrote:
> >>>>>> Kelly
> >>>>>> My experience (from memory):
> >>>>>>
> >>>>>> Plett EVO and ESC About $800
> >>>>>> TP 5300 5S 4P Check Website
> >>>>>> 2 - Astro 109 chargers 280
> >>>>>> 12v Iota power supply 90
> >>>>>>
> >>>>>> If you use 75% capacity it will take 35 to 45 minutes to charge the
&! gt; > ;>>>>> batteries. 2C charging will not hurt the batteries but you cannot get
> >>>>>> more
> >>>>>> than 8amps out of the Astros. I still like the Astros and, when in
> >>>>>> the
> >>>>>> shop,
> >>>>>> charge the batteries in parallel. Balancing is no problem.
> >>>>>>
> >>>>>> The Iota is a great piece of equipmment and will easily handle four
> >>>>>> Astro
> >>>>>> 109s. Nat
> >>>>>>
> >>>>>> ----- Original Message -----
> >>>>>> From: "Kelly Regan"
> >>>>>> To:
> >>>>>> Sent: Saturday, September 16, 2006 5:40 PM
> >>>>>> Subjec! t: [NSR CA-discussion] cost of electric
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>> Can someone post the cost of a 2 meter electric setup.
> >>>>>>>
> >>>>>>> Motor
> >>>>>>>
> >>>>>>> Speed Control
> >>>>>>>
> >>>>>>> Battery size and cost
> >>>>>>>
> >>>>>>> Also how long does it take to charge one battery pack at a
> >>>>>>> reasonable rate, something that won't kill the battery life.
> >>>>>>>
> >>>>>>> Thank you for the help.
> >>>>>>>
> >>>>>>>
> >>>>>>> --
> >>>>>>> Kel! ly Rega n
> >>>>>>> Visit the Georgetown Branch: http://mysite.verizon.net/vze6uror/
> >>>>>>> Freestate Aeromodelers: http://www.freestateaeromodelers.org/
> >>>>>>>
> >>>>>>> _______________________________________________
> >>>>>>> NSRCA-discussion mailing list
> >>>>>>> NSRCA-discussion at lists.nsrca.org
> >>>>>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>> --
> >>>>>>> Internal Virus Database is out-of-date.
> >>>>>>> Checked by AVG Free Edition.
> >>>>>>> Version: 7.1.405 / Virus Database: 268.11.7/437 - Release Date:
> >>>>! ;>&g t;> 9/4/2006
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>
> >>>>> --
> >>>>> Kelly Regan
> >>>>> Visit the Georgetown Branch: http://mysite.verizon.net/vze6uror/
> >>>>> Freestate Aeromodelers: http://www.freestateaeromodelers.org/
> >>>>>
> >>>>> _______________________________________________
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> >>>>>
> >>>>
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