Glow Engine Vs. Electric Engine for 2 m' pattern plane
Ron Van Putte
vanputte at cox.net
Tue May 31 09:20:32 AKDT 2005
This subject looks like a perfect candidate for a K-Factor article.
Ron Van Putte
On May 31, 2005, at 12:03 PM, Richard Strickland wrote:
> My knowledge of controllers is VERY limited. I DID suggest to FMA that
> regeneration would be a potential project for them down the road--Why
> waste
> all that energy! Apparently, there were (maybe are) some brushed type
> controllers that did a little of that--but since I only jumped into
> the E
> side of things last fall--I don't know much history. The battery
> set-up
> weighs about 2lbs., 5oz. including the discharge protection modules.
> Greg
> Covey has an Icepoint E evaluation coming out soon on RCU that shows
> the
> config. with some smaller batteries. At 67 amps usage, I'm getting
> about a
> 57 degree average rise and Orland at 62-4 amps is getting about 10-15
> degrees ave. rise cooler--and he's getting through the pattern with
> decent
> performance and reserve. Both airplanes have solid CF nose ring
> mounts
> with end grain reinforced balsa rear containing mounts with as little
> material as possible remaining. The motors and controllers seem to be
> handling the amperage OK--HackerXL50/14s 6.7:1 and Master 90 Acro
> Controllers. We went for 3:1 ventilation--not quite there but almost.
> COOLING IS A BIG DEAL--Get as much as you can through the fuse! I
> suggest
> having a least one exit close to the batteries. BTW, the canopy is
> still
> tighter after 45 flights than after a couple with the same airplane
> with IC
> and soft mount. Pretty amazing.
>
> Sorry, I get started on this stuff and I can't quit.
>
> Richard
>
>
> Original Message -----
> From: "Bob Richards" <bob at toprudder.com>
> To: <discussion at nsrca.org>
> Sent: Tuesday, May 31, 2005 10:01 AM
> Subject: Re: Glow Engine Vs. Electric Engine for 2 m' pattern plane
>
>
>> Richard,
>>
>> You mentioned braking in the downline, do any of the
>> electric controllers have regenerative braking?
>>
>> Bob R.
>>
>>
>> --- Richard Strickland <richard.s at allied-callaway.com>
>> wrote:
>>
>>> Tom,
>>>
>>> As of yesterday, 45 complete flights-P05 in an
>>> all-up converted 10lb.-15.5oz.Temptation, Hacker
>>> with a 22/12, FMA/Kokam 10s1ps 3200s with cell
>>> protection modules. We are experimenting with using
>>> a little less amperage to extend battery flight time
>>> (and to stop abusing the eq.)--but I have made it
>>> through all flights in any wind and landed with
>>> power. It uses more power in a calm day than
>>> windy--I've got some thoughts on that--but it'll
>>> take more evaluation. It's about equivalent to a
>>> Bully 145 with a 16oz. tank flight time. Wide open
>>> power is a little more than we need. Flying is a
>>> little different--torque comes on differently and I
>>> haven't mastered the correct way to handle downline
>>> braking and spins as far as where to have the idle
>>> set. Flys like a pattern airplane.
>>>
>>> I have an Impact ready to go and got it JUST under
>>> the max. wt. I suspect I'll be able to fly it a
>>> little slower and extend flight times. Orland McKee
>>> and I have been working with FMA helping with the
>>> battery evaluations. They will have some nice
>>> features soon that will hopefully extend battery
>>> life and battery available power for flight time. I
>>> have been chatting mostly via e-mail with Jerry
>>> Budd, Tony Frakowiack, and Jason Schulman and each
>>> guy has been very helpful and encouraging. The guys
>>> at FMA have some great ideas also and are working at
>>> having some very competitive battery systems and
>>> chargers. Yes, we are getting a break on
>>> batteries--but not free--and we are purchasing
>>> everything else at street prices. One very cool
>>> item they have is we can charge up both 5 cell packs
>>> with one charger--but you only get a few charges out
>>> of one deep discharge 12v battery. But it is rare
>>> that I get the time to fly more than 4-5 flights so
>>> I'm not impacted as of yet. A second charger and
>>> another deep-discharge batt. would be needed. You
>>> need three sets of flight batteries. Don't go nuts
>>> buying batteries as they are changing all the time.
>>> There is some VERY cool stuff coming down the pike!
>>> I charge on a power supply at home. I'm becoming
>>> an expert with Velcro. Good luck.
>>>
>>> Richard
>>> ----- Original Message -----
>>> From: Koenig, Tom
>>> To: discussion at nsrca.org
>>> Sent: Sunday, May 29, 2005 5:54 PM
>>> Subject: Glow Engine Vs. Electric Engine for 2 m'
>>> pattern plane
>>>
>>>
>>> Ed and others
>>>
>>> I'm not so sure it is such a silly comparison for
>>> people outside of the US, where costs can be
>>> considerable in the fuel department. Our figures
>>> indicate that at we would be at 'break even' point
>>> if we get 100 flights a pack. Anything more and its
>>> gravy. We are not including things like I/C engine
>>> rebuilds etc either. We simply treated the packs as
>>> 'fuel' in our estimations. Like anything,
>>> maintenance and correct installation is an
>>> issue/learning curve...and done properly I can see
>>> Electric making economic rationale.
>>>
>>> Now if anyone can just give us more info on how it
>>> actually 'feels' to fly the FAI pattern?
>>>
>>> Anyone...please????
>>>
>>> best regards
>>>
>>> Tom
>>> -----Original Message-----
>>> From: discussion-request at nsrca.org
>>> [mailto:discussion-request at nsrca.org]On Behalf Of Ed
>>> Alt
>>> Sent: Monday, 30 May 2005 8:39 AM
>>> To: discussion at nsrca.org
>>> Subject: [SPAM] Re: [SPAM] Re: [SPAM] Re: [SPAM]
>>> Re: Glow Engine Vs. Electric Engine for 2 m' pattern
>>> plane
>>>
>>>
>>> Yes and you need to figure out the jump in your
>>> electric bill. Getting silly isn't it? It's a 2:1
>>> comparison, assuming the batteries last, which
>>> apparently, they don't.
>>>
>>> Ed
>>> ----- Original Message -----
>>> From: Nat Penton
>>>
>>>
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