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Search: Posts Made By: jdetray
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02-24-2009, 02:57 PM
Replies: 9
Views: 1,362
Posted By jdetray

The "C" rating lets you determine how much...

The "C" rating lets you determine how much current a battery is capable of providing.

The maximum current a battery can provide is simply the "C" rating times the capacity of the battery.
...
02-23-2009, 06:15 AM
Replies: 9
Views: 1,362
Posted By jdetray

jtc - Formula for Run Time run time...

jtc -

Formula for Run Time

run time in minutes = (Battery Capacity in Ah/Motor Current in A) x 60

This is just a rough guide, and it requires that you know approximately how much current...
02-16-2009, 04:01 PM
Replies: 20
Views: 3,887
Posted By jdetray

Capt. - Here's one tool that will allow you...

Capt. -

Here's one tool that will allow you to determine the capacity of a battery:
Computerized Battery Analyzer (CBA) (http://www.westmountainradio.com/CBA.htm)

- Jeff
Forum: Power Systems
02-04-2009, 11:44 PM
Replies: 40
Views: 9,146
Posted By jdetray

How about AstroFlight's web site...

How about AstroFlight's web site (http://www.astroflight.com/)?

- Jeff
01-28-2009, 10:34 PM
Replies: 20
Views: 14,551
Posted By jdetray

Rodneh beat me to it. For some reason, the...

Rodneh beat me to it. For some reason, the saltwater bath mis-information just will not die!

Rodneh's advice is the way to go for safely discharging a lipo prior to disposal. A cheap automotive...
01-17-2009, 03:30 AM
Replies: 5
Views: 1,622
Posted By jdetray

Rodney - There are a couple of things to...

Rodney -

There are a couple of things to keep in mind when bench testing power systems.

1. Don't run at full throttle for more than a few seconds at a time -- just long enough to make whatever...
01-16-2009, 11:47 PM
Replies: 5
Views: 1,622
Posted By jdetray

Bench testing the power system of a completely...

Bench testing the power system of a completely assembled plane is pretty unwieldy. I don't know of any really good way of securing the plane.

Bench testing of motors and props can be done with a...
Forum: Foamies
12-16-2008, 04:27 PM
Replies: 36
Views: 30,278
Posted By jdetray

I don't think Big Floyd has flown. On its one and...

I don't think Big Floyd has flown. On its one and only takeoff run in 2005, Big Floyd was about to lift off when its gearbox failed. As far as I know, no further attempts have been made.

Big Floyd...
Forum: Foamies
12-16-2008, 03:49 AM
Replies: 14
Views: 3,880
Posted By jdetray

Looks fantastic! What are the specs? - Jeff

Looks fantastic! What are the specs?

- Jeff
Forum: Foamies
12-16-2008, 03:46 AM
Replies: 36
Views: 30,278
Posted By jdetray

I've always used the Dow blue fanfold foam...

I've always used the Dow blue fanfold foam myself, but the largest foam R/C planes I know about were built with the pink stuff.

24-foot Pink Floyd:...
12-09-2008, 02:59 AM
Replies: 12
Views: 4,206
Posted By jdetray

Even though the Sky Fly itself is a "cheapy," I...

Even though the Sky Fly itself is a "cheapy," I don't necessarily recommend buying the cheapest available radio gear, unless you think it unlikely that you'll eventually own more advanced planes.
...
12-08-2008, 11:46 PM
Replies: 12
Views: 4,206
Posted By jdetray

cfp - Below is a hookup diagram for a...

cfp -

Below is a hookup diagram for a typical electric plane using standard, off-the-shelf parts. If you change to a brushless motor and standard 3-wire servos, you'll need to replace everything,...
12-04-2008, 10:31 PM
Replies: 10
Views: 1,578
Posted By jdetray

Hi Don - Here's a thread with links to...

Hi Don -

Here's a thread with links to dozens of electric flight calculators.
http://www.rcgroups.com/forums/showthread.php?t=606703

- Jeff
Forum: Power Systems
11-29-2008, 06:09 PM
Replies: 6
Views: 1,725
Posted By jdetray

If you always use the recommended equipment, you...

If you always use the recommended equipment, you will usually be OK. But when you start experimenting -- especially changing props -- it is important to measure before you fly.

Current is not the...
Forum: Power Systems
11-28-2008, 05:39 AM
Replies: 6
Views: 1,725
Posted By jdetray

Sorry about your loss. That's never fun. In...

Sorry about your loss. That's never fun.

In fact, the wrong prop can result in overheating the ESC. The larger the prop, the more current the motor will draw. The more current the motor draws,...
Forum: Beginners
11-18-2008, 05:34 AM
Replies: 6
Views: 1,845
Posted By jdetray

I might as well contribute my diagram. -...

I might as well contribute my diagram.

- Jeff
11-11-2008, 09:42 PM
Replies: 11
Views: 1,894
Posted By jdetray

Dave - You are making it much more...

Dave -

You are making it much more complicated than it needs to be!

The writing on the prop always faces forward, in the direction of flight. That's it.

- Jeff
11-02-2008, 07:46 PM
Replies: 26
Views: 5,828
Posted By jdetray

Watts and horsepower are both measures of power....

Watts and horsepower are both measures of power. 1 HP = 746 W.

Torque is not the same as power. Therefore, torque is not the same as watts. It is possible for a motor to consume a great deal of...
10-31-2008, 04:57 PM
Replies: 26
Views: 5,828
Posted By jdetray

Unfortunately, my flying isn't as good as my...

Unfortunately, my flying isn't as good as my writing!

- Jeff
10-31-2008, 04:47 PM
Replies: 26
Views: 5,828
Posted By jdetray

One correction. In a brushed motor, the brushes...

One correction. In a brushed motor, the brushes do NOT rub against the magnets.

In a brushed motor, it is the brushes that are connected to the electronic speed controller (ESC). The brushes rub...
10-28-2008, 03:43 AM
Replies: 26
Views: 5,828
Posted By jdetray

The motors used in robots are most often stepper...

The motors used in robots are most often stepper motors, not brushless motors. Stepper motors are ideal where relatively high precision is required but high speed is not required. Also, controllers...
Forum: Beginners
10-09-2008, 06:38 AM
Replies: 2
Views: 1,007
Posted By jdetray

Steve -- That is outstanding....

Steve --

That is outstanding. Congratulations. It is a great feeling when you finally have your first successful flight!

- Jeff
Forum: Foamies
10-05-2008, 08:38 PM
Replies: 36
Views: 21,930
Posted By jdetray

Ray - That is a GREAT looking airplane! ...

Ray -

That is a GREAT looking airplane!

- Jeff
10-01-2008, 05:39 AM
Replies: 20
Views: 6,918
Posted By jdetray

Hi Wingman - I believe all of the power...

Hi Wingman -

I believe all of the power supplies recommended in this thread are regulated. That is indeed an important point, and it's why most of the "wall-plug" type power supplies are not...
09-27-2008, 06:09 AM
Replies: 4
Views: 1,027
Posted By jdetray

Here's a chart I found a few years ago. It's a...

Here's a chart I found a few years ago. It's a bit different from yours. I don't recall who devised this chart.



Translating into 3-cell voltages, this would be:

12.6v = 100%
12.09v =...
09-26-2008, 05:58 AM
Replies: 20
Views: 6,918
Posted By jdetray

You need a so-called 12V power supply. In fact,...

You need a so-called 12V power supply. In fact, the actual voltage of such a supply will be 13.8V, which is the nominal voltage of a fully-charged automobile battery.

One popular line of power...
09-24-2008, 02:41 PM
Replies: 21
Views: 2,677
Posted By jdetray

To find the actual RPM, you measure it with a...

To find the actual RPM, you measure it with a tachometer, such as this one (http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXPX81&P=ML).

As Paul said, for a given motor the RPM will vary with...
09-24-2008, 04:44 AM
Replies: 21
Views: 2,677
Posted By jdetray

It's mainly the GWS slow flyer props (the RS or...

It's mainly the GWS slow flyer props (the RS or "Reduction Series") that have a reputation for being flimsy, though they are fine for their intended use as slow flyer props. I've never had a GWS prop...
09-24-2008, 04:28 AM
Replies: 5
Views: 3,296
Posted By jdetray

The brushless outrunner motors in CD-ROM drives...

The brushless outrunner motors in CD-ROM drives use Hall sensors (see below). Perhaps you could learn something about orienting the Hall sensors by examining a CD-ROM motor.

- Jeff
Forum: Foamies
09-23-2008, 05:36 PM
Replies: 36
Views: 21,930
Posted By jdetray

The "Floyd" series of planes were all built from...

The "Floyd" series of planes were all built from pink Owens Corning fanfold foam insulation. They were built in a college dorm at the University of Wisconsin by an engineering student, Hans (whose...
Showing results 1 to 30 of 330
 


 
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