[NSRCA-discussion] Electric Pattern

Wed Mar 5 10:14:01 AKST 2008

See what we opened up? LOL

It's just variable and depends on everything....size/weight of the plane, 
drag, speed, desired vertical, power demand of the flight and time, you name 
it...it matters. It's one thing I really love about glow LOL

The 2 meter stuff is fairly well tested and hashed out....fairly well.....

The 110 sized stuff for what we would do with it is still very much "in 
testing".

Yeah I have tested some stuff, some work, some sorta work....and the one I 
settled on was a system that gave me about 2000 watts, 70 amps and is pretty 
comfortable with a 19x12 e prop on 8s. Is it overkill? Yep. but I like 
overkill, that way I am not stressing the packs too much. When weight 
becomes an issue, I just build lighter =)

of course on paper the system I thought would work great ended up with a 
motor temp of about 190 deg F. LMAO!!!!! Plenty of power though....

You just have to pick a direction and jump in there and see if it is what 
you want. Just be prepared to say "that ain't it".

-Mike

----- Original Message ----- 
From: "Ron Van Putte" <vanputte at cox.net>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Wednesday, March 05, 2008 1:57 PM
Subject: Re: [NSRCA-discussion] Electric Pattern

>I must disagree with Mike here.  The "rules of thumb" on the required
> electric motor power versus weight are:  Sport models with virtually
> no aerobatic capability = 50 to 75 watts per pound.  For models with
> some aerobatic capability = 100 to 125 watts per pound.  For models
> with aggressive aerobatic capability = 175 to 200 watts per pound.
> HOWEVER, these "rules of thumb" are for models weighing less than
> about 5 pounds.  There is a scaling factor which most be applied for
> heavier models.  For example, an 11 pound airplane would appear to
> require no more than 2200 watts to be aggressively aerobatic, but the
> actual wattage requirement seems to be about 2400 to 2500 watts.
>
> One of these days I will sit down and develop the scaling factor, but
> for the time being be aware that the "rules of thumb" come up a bit
> short for airplanes weighing about 11 pounds.
>
> Ron Van Putte
>
> On Mar 5, 2008, at 12:09 PM, Mike Hester wrote:
>
>> For pattern a good rule of thumb is 150 watts per pound. A better
>> rule of thumb is closer to 200 watts per pound.
>>
>> It takes a lot of experimentation to find the right combination,
>> sometimes what looks great on paper doesn't work all that well in
>> application.
>>
>> What you're looking for is more than you "need". this way when you
>> push it in bad conditions, you don't burn it all up.
>>
>> I have found some very cheap chinese motors that work as good or
>> better than what we can get over here from the more established
>> companies. Some combinations are really cool, especially in the 110
>> range. You're looking for around 1600-2000 watts, motor weight
>> about 500 grams or less, about 250-300kv, and using 8s packs.
>> Lethal =) And fairly inexpensive.
>>
>> Then you just have to figure out whether you want to turn a large
>> prop slow or a small prop fast. Somewhere in there, you hit the
>> magic for the particular plane.
>>
>> But if you want "established", the E flight power 110 is ok, and
>> the Axi 4130-20 works. Don't get the -16 turn axi as it won't
>> handle 8 cells and won't deliver quite enough power.
>>
>> -Mike
>> ----- Original Message -----
>> From: John Ferrell
>> To: NSRCA Mailing List
>> Sent: Wednesday, March 05, 2008 12:51 PM
>> Subject: Re: [NSRCA-discussion] Electric Pattern
>>
>> I am not picking on Incheon here, the questions are to all:
>>
>> I too, am struggling to understand how to select appropriate power
>> for a given airplane.
>>
>> The specs for the ElectriFly 110 call for up to a 15 pound
>> airplane, It sounds like a lot of Watts for an 8 pounder.
>> A Phoenix 80 controller also sounds like a lot of over kill. Can I
>> assume that the electrics can just be run at a lower power setting
>> and less batteries without overburdening the airframe?
>>
>> Which AXI would be interchangeable with the Electrifly 110?
>>
>> Would the Dualsky XM5060CA be an equivalent? The advertising
>> indicates 1:1 correspondence to a YS 110.
>>
>> Is the following comment True or False?
>> It seems that an over spec motor and speed control are only a
>> financial mistake. Flying at reduced power levels is not a
>> technical flaw and in fact may provide a more reliable power setup.
>>
>> John Ferrell    W8CCW
>>
>> "All that is necessary for the triumph of evil is for good men to
>> do nothing." -- Edmund Burke
>> http://DixieNC.US
>> ----- Original Message -----
>> From: Ihncheol Park
>> To: NSRCA Mailing List
>> Sent: Monday, March 03, 2008 8:57 PM
>> Subject: Re: [NSRCA-discussion] Electric Pattern
>>
>> Jay,
>>
>> Lots of power setups available.  It all depends on how much you
>> want to put in.
>>
>> Hacker A50,  E-Flite 110, Axi,  BPHobbies,  Welgard, Dualsky, Neu,
>> Hyperion, etc.
>>
>> For a reasonable price, E-Flite seems to be a good choice with
>> Castle Phx 80 or E-Flite 60 may also work.  I went with E-Flite 110
>> for Inspire 90 because I couldn't install the YS110 on it.
>> Hacker, Axi are very good, but I was told these make a little noise
>> during the run.  Not sure what that noise is.
>> Hyperion runs really good too.
>> I can look up if I have spec on Focus 110.
>>
>> Ihncheol
>>
>>
>>
>>
>>
>>
>>
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