Search: Posts Made By: pmullen503
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Forum: 3D Printing
10-15-2020, 03:59 PM
Replies: 7
Views: 129
Posted By pmullen503

I feel your pain. I had a 22 hr print become...

I feel your pain. I had a 22 hr print become unstuck from the build plate around the 20 hr mark. Of course, I wasn't there when it happened. What a mess!
10-08-2020, 07:09 PM
Replies: 20
Views: 493
Posted By pmullen503

I have a Hobbyking servo tester that won't...

I have a Hobbyking servo tester that won't reliably operate retracts. Was ready to toss the retracts till I tried it on a receiver with an old esc and lipo; worked perfectly.

Had some larger...
Forum: Power Systems
09-21-2020, 04:02 PM
Replies: 8
Views: 457
Posted By pmullen503

It will if the failure mode doesn't result in a...

It will if the failure mode doesn't result in a short. It that case, it can take out both. If you isolate the two BECs with diodes you can get redundancy albeit with some voltage drop from the...
Forum: Power Systems
09-17-2020, 09:05 PM
Replies: 8
Views: 457
Posted By pmullen503

Generally, if you have ESC with BEC circuits you...

Generally, if you have ESC with BEC circuits you should remove one red lead if they are switching type BECs. Smaller (up to 3s) ESCs can have linear BECs which are less problematic. A linear BEC is...
08-24-2020, 05:29 PM
Replies: 4
Views: 835
Posted By pmullen503

You could match the dihedral of the real plane. ...

You could match the dihedral of the real plane. Can you find a scale drawing?
08-10-2020, 09:04 PM
Replies: 4
Views: 950
Posted By pmullen503

Your RX could have a bad antenna. If no one else...

Your RX could have a bad antenna. If no one else has ever had that problem, and you only had this problem with this rx, twice in a row. I would suspect the RX. Maybe an antenna broke and the one...
06-24-2020, 06:20 PM
Replies: 17
Views: 1,879
Posted By pmullen503

What software do you use to vectorise?

What software do you use to vectorise?
02-29-2020, 05:00 PM
Replies: 3
Views: 2,228
Posted By pmullen503

I had this happen on some rubber coated...

I had this happen on some rubber coated binoculars I have. It required a solvent and lots rubbing to get it off. Basically had to rub down to "clean" rubber. I think the solvent may have been...
12-02-2019, 09:42 PM
Replies: 5
Views: 1,627
Posted By pmullen503

Weight of the terminal tackle shouldn't be a...

Weight of the terminal tackle shouldn't be a problem but what it the drag on that line? It would be hard to keep the line from dragging in the water. What about an RC boat?
05-31-2019, 04:01 PM
Replies: 13
Views: 14,706
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: 801
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: 801
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: 936
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: 936
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: 767
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: 1,746
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: 1,746
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: 1,746
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: 1,415
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: 1,415
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: 1,773
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: 1,760
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: 3,771
Posted By pmullen503

Fantastic!

Fantastic!
03-12-2018, 05:55 PM
Replies: 16
Views: 1,815
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: 8,438
Posted By pmullen503

[popcorn][popcorn][popcorn]

[popcorn][popcorn][popcorn]
10-21-2017, 02:43 AM
Replies: 62
Views: 8,438
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: 4,517
Posted By pmullen503

Nice! Well done.

Nice! Well done.
09-25-2017, 03:26 PM
Replies: 23
Views: 4,517
Posted By pmullen503

Beautiful work!

Beautiful work!
09-17-2017, 01:13 AM
Replies: 23
Views: 4,517
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: 4,517
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...
Showing results 1 to 30 of 500
 


 
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