Search: Posts Made By: jjw
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02-09-2010, 02:11 PM
Replies: 8
Views: 1,964
Posted By jjw

Can't help you with contacting "Loong-Max", but...

Can't help you with contacting "Loong-Max", but to recover a LiPo battery that has been discharged below the minimum allowable voltage (typically 2.9v - 3.0v per cell) this is what you have to do:
...
Forum: Power Systems
02-06-2010, 08:15 PM
Replies: 9
Views: 1,796
Posted By jjw

I've had a few "singing" set-ups (actually they...

I've had a few "singing" set-ups (actually they all sing to some degree)... One thing I have noticed is that certain combinations of particular ESCs and motors are noisy, and I can change things...
02-06-2010, 05:58 PM
Replies: 4
Views: 1,324
Posted By jjw

They're a little big for what I consider micro,...

They're a little big for what I consider micro, but I can think of lots of uses for the '1600' and '2200'... Thanks for posting...

-Jim.
02-06-2010, 04:59 PM
Replies: 49
Views: 17,527
Posted By jjw

[QUOTE=park;689671]As far as the electronics, I...

[QUOTE=park;689671]As far as the electronics, I don't know? What would be cool is the ESC and motor I have from a Vapor. I know I'll catch an ear fun of how the 150 will be to heavy for that power...
Forum: Power Systems
02-06-2010, 02:34 PM
Replies: 11
Views: 3,715
Posted By jjw

Ready-to-fly weight and wing area... then we can...

Ready-to-fly weight and wing area... then we can start to do some predictive performance modeling...

To get the craft to fly the way you want, you're going to need an adequate amount of thrust...
02-06-2010, 02:14 AM
Replies: 48
Views: 50,197
Posted By jjw

Hi... For the purposes of estimating DC motor...

Hi... For the purposes of estimating DC motor performance, Rm (or terminal resistance) is the motor coil DC resistance... I typically measure this using a constant current source and feeding this...
02-05-2010, 02:22 PM
Replies: 48
Views: 50,197
Posted By jjw

Did anyone think it would have been made in the...

Did anyone think it would have been made in the good old USA?... not likely. Virtually all consumer class electronic manufacturing (and even most "professional" level) has gone offshore. Its a simple...
Forum: Power Systems
02-05-2010, 12:14 AM
Replies: 11
Views: 3,715
Posted By jjw

What are you asking?... more powerful in what...

What are you asking?... more powerful in what way?... thrust?... watts consumed?... What voltage are you going to run them at?... What prop(s) are you going to use?...

Your question, as asked,...
02-04-2010, 05:32 PM
Replies: 48
Views: 50,197
Posted By jjw

Well, my guess is your numbers are correct......

Well, my guess is your numbers are correct... Looks like you're going to have to measure all your own constants for the HobbyCity motors...

Lack of reliable motor constant data (from the...
02-04-2010, 12:37 AM
Replies: 48
Views: 50,197
Posted By jjw

When I measure my own motor constants, it is...

When I measure my own motor constants, it is usual for me to see numbers slightly different from those that are published... however, the difference you saw in resistance is quite large...

What...
02-03-2010, 02:55 AM
Replies: 35
Views: 22,087
Posted By jjw

In my experience it is not necessary to balance...

In my experience it is not necessary to balance every time you charge... however, there's no set rule on this... too many variables. Its something you'll just get a "feel" for based on how you use...
02-02-2010, 02:11 PM
Replies: 35
Views: 22,087
Posted By jjw

Hi... If I understand your question correctly......

Hi... If I understand your question correctly... if you want to "balance" charge, then yes you need to connect both balance jack and the +/- charger ouput connectors to the battery.

You do not...
01-26-2010, 11:33 PM
Replies: 30
Views: 7,341
Posted By jjw

One can somtimes bring a flat LiPo battery back...

One can somtimes bring a flat LiPo battery back to life in the manner you did... The recommended method (very close to what you did) is to to put it on a very low constant current charge (I'm talking...
01-22-2010, 11:07 PM
Replies: 10
Views: 1,392
Posted By jjw

Regarding your questions on the battery... from...

Regarding your questions on the battery... from what you wrote, you have an 11.1 volt (3 LiPo cell) 1300 milli-amp hour battery. The 1300mah is the batteries "capacity". Meaning that, in theory, it...
01-22-2010, 04:15 PM
Replies: 8
Views: 1,015
Posted By jjw

Hi... It wasn't the message, it was the tone... ...

Hi... It wasn't the message, it was the tone...

You came off sounding like you had just a little too much coffee... ;-)

-Jim.
01-22-2010, 04:10 PM
Replies: 10
Views: 1,392
Posted By jjw

1. If your next flying session is going to be the...

1. If your next flying session is going to be the next day, or the next weekend, then it really doesn't matter. However, if its not going to be for a month then I would not leave them in either a...
01-19-2010, 01:43 AM
Replies: 4
Views: 1,412
Posted By jjw

Yup... taking a trip to Harbor Freight is one of...

Yup... taking a trip to Harbor Freight is one of my guilty pleasures... Some of their stuff is actually pretty good... especially for the week-end warrior type... but some is total junk.

As an...
01-18-2010, 01:56 PM
Replies: 7
Views: 2,151
Posted By jjw

Curious what you're looking for in a "LiPo...

Curious what you're looking for in a "LiPo guide"... the link provided in post number #2 (here again, http://www.revolectrix.com/resource.php) has an awful lot of information...

If you can be a...
01-17-2010, 07:37 PM
Replies: 18
Views: 2,819
Posted By jjw

If your requirements are 60 watts or lower this...

If your requirements are 60 watts or lower this one is a good deal...

http://www.hobbypartz.com/60p-dyc-1003.html

I have the DC only version of this one... works fantastic... required...
01-16-2010, 07:57 PM
Replies: 7
Views: 2,151
Posted By jjw

First, if it is a 2 cell LiPo battery then it is...

First, if it is a 2 cell LiPo battery then it is 7.4 volt and not 11.1...

Regarding charge rates... typically LiPos are charged at a 1C rate (1 times the capacity rating)... so in the case of...
01-15-2010, 02:45 PM
Replies: 16
Views: 2,556
Posted By jjw

FWIW, I would be much more concerned with how the...

FWIW, I would be much more concerned with how the batteries were used than how old they are (within reason)... The biggest factors affecting LiPo cell life are charge and dis-charge rates... Industry...
Forum: Power Systems
01-14-2010, 07:31 PM
Replies: 5
Views: 1,288
Posted By jjw

To get a useful answer to your question, you'll...

To get a useful answer to your question, you'll need to supply a bit more information...

Are you happy with the way your craft flys now?... or are you looking to change its performance...
01-13-2010, 08:25 PM
Replies: 17
Views: 3,174
Posted By jjw

I don't know the specifics of the Hyperion...

I don't know the specifics of the Hyperion product, but the general improvements in lithium cells are coming from improved electrode materials (either from processing or material selection) which...
01-13-2010, 05:05 AM
Replies: 17
Views: 3,174
Posted By jjw

First... the advertised "C" rates of most lithium...

First... the advertised "C" rates of most lithium cells sold to the hobby industry are wildly optimistic...

However... a quick answer to your charging question is... because the charging...
01-12-2010, 04:14 PM
Replies: 17
Views: 2,981
Posted By jjw

Here you go... ...

Here you go...

http://cgi.ebay.com/12V-30A-DC-Universal-Regulated-Switching-Power-Supply_W0QQitemZ280445116350QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item414bd4dfbe

-Jim.
01-10-2010, 11:41 PM
Replies: 8
Views: 1,468
Posted By jjw

Steve's got it right... It all depends on what...

Steve's got it right... It all depends on what battery chemistry you're talking about. LiPos are pretty much a charge and go. NiCd and NiMH cells typically will benefit from a few moderate...
01-08-2010, 03:38 PM
Replies: 16
Views: 2,534
Posted By jjw

My original 1958 "Chatterbox" plans... ...

My original 1958 "Chatterbox" plans...

http://img64.imageshack.us/img64/4779/pdr0694large.jpg

-Jim.
01-07-2010, 03:33 PM
Replies: 16
Views: 2,534
Posted By jjw

Thanks!... any info will be appreciated... ...

Thanks!... any info will be appreciated...

-Jim.
01-07-2010, 02:47 PM
Replies: 16
Views: 2,534
Posted By jjw

Hey!... that's the design I have the 1950's plans...

Hey!... that's the design I have the 1950's plans for... very interesting that its being kitted 50+ years later.

Does anyone know where I can purchase a copy of the plans for the latest version...
01-07-2010, 02:21 PM
Replies: 16
Views: 2,534
Posted By jjw

Barry... I'm not familiar with the...

Barry...

I'm not familiar with the properties of "sign-writing vinyl", but I'd be concerned about its shrink rate... and making sure that it won't warp or collapse the framework when you go to...
Showing results 1 to 30 of 124
 


 
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