Search: Posts Made By: pmullen503
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05-31-2019, 04:01 PM
Replies: 13
Views: 10,731
Posted By pmullen503

A small gas generator (600-1000W) will also work...

A small gas generator (600-1000W) will also work but you'll have the noise. The initial cost is more than a new deep cycle battery but you won't have to worry about recharging or over discharging.
05-01-2019, 09:52 PM
Replies: 6
Views: 379
Posted By pmullen503

The C rating of a battery refers to the...

The C rating of a battery refers to the theoretical current it can put out. So a 20 C 2200 mAh battery can theoretically put out 44 amps, a 40C, 88 amps. But if your motor will only draw 20 amps, as...
05-01-2019, 07:41 PM
Replies: 6
Views: 379
Posted By pmullen503

ESCs don't have a C rating, just amps. If your...

ESCs don't have a C rating, just amps. If your motor/prop combination draws less than the ESC amp rating* you'll be OK regardless of the battery.

*I run an ESC rated 20 to 30% higher than my...
Forum: Foamies
04-06-2019, 02:55 AM
Replies: 8
Views: 370
Posted By pmullen503

I always use solid wood for spars/braces. Plywood...

I always use solid wood for spars/braces. Plywood has half it's plys running in the wrong direction. Solid wood is stronger in the direction you need compared to the same weight of plywood.
Forum: Foamies
04-04-2019, 07:08 PM
Replies: 8
Views: 370
Posted By pmullen503

I see you have a table saw... What I've done in...

I see you have a table saw... What I've done in that situation is glue the cores together with proper dihedral etc. Then prop the wing over the table saw (lots of sand bags etc. so it can't move)...
04-02-2019, 02:44 AM
Replies: 6
Views: 452
Posted By pmullen503

If you are on 3S that should be OK. You are...

If you are on 3S that should be OK. You are obviously drawing too much current for your ESC and/or motor. Are you sure you have a KV1000 motor? Are you trying to run that combo on 4S?
01-06-2019, 03:57 PM
Replies: 9
Views: 1,286
Posted By pmullen503

How about using bicycle disc brake parts? Mount...

How about using bicycle disc brake parts? Mount the disc to the motor and have some type of threaded mechanism to pull the cable to adjust the tension.
https://i.stack.imgur.com/aqqBA.jpg
01-06-2019, 02:59 AM
Replies: 9
Views: 1,286
Posted By pmullen503

What you really want to know is how much voltage...

What you really want to know is how much voltage sag you get a full throttle, right? Why not just test the batteries with the watt meter in the plane they are meant for?

You could set up a test...
01-06-2019, 02:41 AM
Replies: 9
Views: 1,286
Posted By pmullen503

With my Frsky Taranis and an SP-40A...

With my Frsky Taranis and an SP-40A (https://alofthobbies.com/frsky-sp-40a-smart-port-40-amp-sensor.html) sensor on board I get real time voltage and amps. I can log the telemetry in the transmitter...
01-05-2019, 12:02 AM
Replies: 11
Views: 1,128
Posted By pmullen503

Get yourself a watt meter. Then you'll know what...

Get yourself a watt meter. Then you'll know what a particular motor and prop combination is drawing. Makes it much easier to troubleshoot a power system.

Remember, if you have 3V/cell at rest...
01-04-2019, 11:02 PM
Replies: 11
Views: 1,128
Posted By pmullen503

At 3V/cell, a lipo is exhausted. Your ESC hit...

At 3V/cell, a lipo is exhausted. Your ESC hit LVC and shut you down as it should have.
11-25-2018, 04:24 AM
Replies: 9
Views: 1,087
Posted By pmullen503

I had a similar problem, wanted full power for...

I had a similar problem, wanted full power for take off but only needed 10 or 15% for flight. I added a throttle curve that gave me much more stick movement at low levels. 0-75% stick was 0-25%...
Forum: Power Systems
11-04-2018, 02:58 AM
Replies: 20
Views: 1,050
Posted By pmullen503

I assume you know your battery is good; that it...

I assume you know your battery is good; that it is capable of putting out more amps with little or no voltage sag.

Then I would recalibrate your ESC. Many ESCs will recalibrate by powering the...
04-02-2018, 10:20 PM
Replies: 20
Views: 2,959
Posted By pmullen503

Fantastic!

Fantastic!
03-12-2018, 05:55 PM
Replies: 16
Views: 1,373
Posted By pmullen503

Performance will be fine depending on the prop. ...

Performance will be fine depending on the prop. Flight times of 5-7 minutes.
11-11-2017, 01:47 PM
Replies: 62
Views: 6,026
Posted By pmullen503

[popcorn][popcorn][popcorn]

[popcorn][popcorn][popcorn]
10-21-2017, 02:43 AM
Replies: 62
Views: 6,026
Posted By pmullen503

Watching with interest. I've been thinking about...

Watching with interest. I've been thinking about doing an old school pattern ship in electric.
10-09-2017, 12:22 AM
Replies: 23
Views: 3,952
Posted By pmullen503

Nice! Well done.

Nice! Well done.
09-25-2017, 03:26 PM
Replies: 23
Views: 3,952
Posted By pmullen503

Beautiful work!

Beautiful work!
09-17-2017, 01:13 AM
Replies: 23
Views: 3,952
Posted By pmullen503

6 into one was pretty impressive. Was the area...

6 into one was pretty impressive. Was the area small enough to maintain the eflux velocity?
09-16-2017, 12:01 AM
Replies: 23
Views: 3,952
Posted By pmullen503

I know with my CAD skills the bifurcated ducts...

I know with my CAD skills the bifurcated ducts would be a challenge but it could surely be done. I'm working on a BV-215 using a single, larger EDF instead of two smaller units. In that case, the...
09-15-2017, 01:57 PM
Replies: 23
Views: 3,952
Posted By pmullen503

Impressive, as usual. Did you consider a...

Impressive, as usual.

Did you consider a single larger fan and bifurcated ducts?
Forum: Power Systems
09-12-2017, 01:22 PM
Replies: 48
Views: 4,276
Posted By pmullen503

I run that motor on a glider. 20-30 seconds of...

I run that motor on a glider. 20-30 seconds of power and then off for a few minutes. I run either a 8x4 or a 7x5 prop which is really the limit for this motor on 3s. A 7x4 is a good match. A 9x6 was...
09-09-2017, 02:31 AM
Replies: 2
Views: 504
Posted By pmullen503

Thanks! Those ruined thread pix we're really...

Thanks! Those ruined thread pix we're really annoying.
Forum: Foamies
08-24-2017, 12:18 PM
Replies: 7
Views: 2,073
Posted By pmullen503

It does look either tail heavy or maybe the...

It does look either tail heavy or maybe the elevator throw needs to be reduced.
08-13-2017, 02:14 AM
Replies: 7
Views: 827
Posted By pmullen503

Can you glue a scrap of plywood behind the...

Can you glue a scrap of plywood behind the stripped hole and screw into that?
Replies: 2
Views: 2,194
Posted By pmullen503

Try the TX and rx with different, known good...

Try the TX and rx with different, known good servos. Then swap out each servo in the boat one at a time to verify that it is a bad servo. It's likely a dirty pot on the bad servo. If it's a winch...
Replies: 65
Views: 7,262
Posted By pmullen503

One word: telemetry. Once you've used it,...

One word: telemetry.

Once you've used it, you'll never want another radio without it. Frsky has good inexpensive telemetry so I've gone to Taranis and X6R receivers that use a cheap sender for...
Replies: 1
Views: 1,243
Posted By pmullen503

Short answer is no. A DHT-U will show it on it's...

Short answer is no. A DHT-U will show it on it's screen. For the money you are better off going to a Frsky QX-7 or Taranis.
Forum: Foamies
04-25-2017, 11:43 PM
Replies: 55
Views: 7,609
Posted By pmullen503

Why would the TX sound an alarm? TX battery too...

Why would the TX sound an alarm? TX battery too low?
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