Re: Electric for large Planes

"H Davis" <hdavis@[EMAIL PROTECTED]
> wrote in message 
news:17Hlk.1128$gs6.344@[EMAIL PROTECTED]
> Ok, Ted (or anyone else for that matter), I've looked around the web and

> can't find an explanation for the 4S, 7S,2S terms used to describe 
> batteries. I've checked Red's Battery Clinic and other such sites with
no 
> luck. As is obvious, I'm just starting to get interested in electrics.
So 
> what does this mean?
>
> Is there a really good place on the web to try to cram all this 
> information into my brain? For that matter is there anyplace that would 
> make some sense out of electric motor sizes for electric airplanes? It 
> can't be all that much of a dark science,can it?
>
> Harlan
>
>
> "Ted Campanelli" <tcamp@[EMAIL PROTECTED]
> wrote in message 
> news:XCtlk.7151$cn7.536@[EMAIL PROTECTED]
>> Ted shuffled out of his cave and grunted these great (and sometimes not

>> so great) words of knowledge:
>>> Contact Vision Hobbies in Phoenix. They fly a big stearman on the
Storm 
>>> 6374 motor with great success.  They may even have some videos of it
on 
>>> their website at www.visionhobbies.com
>>>
>>>
>>> "Glenn Jacobs" <jakeinhartsel@[EMAIL PROTECTED]
> wrote in message 
>>> news:xP6dnaM9No7nDanVnZ2dnUVZ_umdnZ2d@[EMAIL PROTECTED]
>>>>I plan to start a 1/4 scale Stearman (Boeing Kadet) this Fall or
Winter. 
>>>>I
>>>> intend to model the plane flown by Johnny Vasey in the 1949 National
>>>> Acrobatic Champion****ps. I will use the Barron plans for the basic 
>>>> plane.
>>>>
>>>> My question is the practicality of using electric power for this 
>>>> airplane. To
>>>> make it even more complicated as I live at 9,750 feet (2972 meters) 
>>>> which
>>>> requires significantly more power.
>>>>
>>>> Is there a conversion formula for Electric Versus Gas? How about 
>>>> relative
>>>> expense? Certainly not having to clean up the plane after flights is
a 
>>>> plus,
>>>> but a negative is the time to recharge batteries.
>>>>
>>>> Any thoughts?
>>>>
>>>> JakeInHartsel
>>>
>>>
>>
>> I would investigate the A123 batteries.  They are heavier than lipos,
but 
>> they can be "quick" charged (if I remember correctly) in about 15 
>> minutes.
>>
>> It is practical and feasable to do the plane as an electric.  The only 
>> "problem" I can see is the battery expense.  I suggest checking out the

>> lipos (and also the motors and ESC) at Hobby City
>>
>> http://www.hobbycity.com/hobbycity/store/uh_index.asp
>>
>> Their prices are NOTICEABLY less than stateside.  In 3 years I have had

>> no problems with their 4s lipos and their motors and ESC (Turnigy and 
>> HXT) are at least equal to what is available here.  I do not push my 
>> lipos and I charge them at 1C.  For the difference in battery cost you 
>> can get 2 battery sets for the price of 1 battery set here.
>
>

--------------

You're not alone, Harlan. I forget what the designations mean too.

I "think" I saw a description of LiPo terminology on one of the commercial

forums a few years ago, but I can't remember which one it was. It might
have 
been the one that Anne Marie Cross owns, Wattflyer?

Ed Cregger