Search: Posts Made By: pmullen503
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03-01-2021, 10:47 PM
Replies: 32
Views: 655
Posted By pmullen503

Or if the mains are too far behind the CG. I had...

Or if the mains are too far behind the CG. I had that problem on my Vulcan.
02-23-2021, 03:19 PM
Replies: 32
Views: 655
Posted By pmullen503

Do you have a watt meter? EDFs are amp hungry and...

Do you have a watt meter? EDFs are amp hungry and batteries lose the ability to deliver high amps long before they lose capacity. I have batteries that where once good in EDFs but are now only good...
02-12-2021, 04:00 PM
Replies: 1
Views: 200
Posted By pmullen503

When I do 3D printed horns and linkage the layer...

When I do 3D printed horns and linkage the layer orientation is usually bad for the linkage connection. I'll use a clevis-like connection to the horn (like a wish bone that straddles the horn) with...
Replies: 6
Views: 381
Posted By pmullen503

Most HV ESCs are OPTO. A battery or a UBEC is...

Most HV ESCs are OPTO. A battery or a UBEC is what's needed. Plug it in to any open servo slot on the receiver if the receiver doesn't have a dedicated batt slot.
Forum: Beginners
01-04-2021, 06:12 PM
Replies: 15
Views: 943
Posted By pmullen503

That's not that large. You might be able to get...

That's not that large. You might be able to get by with smaller EDFs and lighter batteries. It depends on the performance you are looking for.
Forum: Beginners
12-31-2020, 10:33 PM
Replies: 15
Views: 943
Posted By pmullen503

There is a common 5v bus inside the receiver, so...

There is a common 5v bus inside the receiver, so plugging in both ESCs connects their 5v outputs. The problem is that with a switched BEC (built in to your ESCs) the 5v output is not smooth like a...
Forum: Beginners
12-31-2020, 07:22 PM
Replies: 15
Views: 943
Posted By pmullen503

The red wire is the center wire on the small 3...

The red wire is the center wire on the small 3 wire lead. It provides 5v (typically) for the receiver and servos. If you have two ESCs you typically disconnect one of the red wires.

#1 Those...
Forum: Beginners
12-31-2020, 06:03 PM
Replies: 15
Views: 943
Posted By pmullen503

Welcome. A single 3500 mAh battery for two...

Welcome.

A single 3500 mAh battery for two 70mm fans is asking a lot from one battery. Theoretical maximum current for a 30C, 3500 mAh is 105 Amp for the battery and your two fans could draw more...
11-27-2020, 10:25 PM
Replies: 7
Views: 1,157
Posted By pmullen503

I have buddies who want a plan they downloaded...

I have buddies who want a plan they downloaded cut for them. I explain the process of loading the file and tracing the parts vectors....It's not something I'll do for them for free unless I want that...
11-27-2020, 06:28 PM
Replies: 7
Views: 1,157
Posted By pmullen503

I have a 40w Epilog laser which I cut 1/4" ply on...

I have a 40w Epilog laser which I cut 1/4" ply on all the time. I runs just like a printer in Windows. 12 x 24" bed. It was expensive but very easy to use and reliable.

There are Chinese water...
11-23-2020, 06:04 PM
Replies: 8
Views: 1,753
Posted By pmullen503

A chunk of foam to protect the tail cone during...

A chunk of foam to protect the tail cone during transport?
Forum: Beginners
10-24-2020, 09:59 PM
Replies: 2
Views: 1,505
Posted By pmullen503

I've ordered many items from Value Hobby. The...

I've ordered many items from Value Hobby. The products are good, prices good, and they are close to me so shipping is quick. Customer service is not great as others have said. But no worse than...
Forum: 3D Printing
10-15-2020, 04:59 PM
Replies: 7
Views: 791
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, 08:09 PM
Replies: 20
Views: 3,035
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, 05:02 PM
Replies: 8
Views: 2,359
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, 10:05 PM
Replies: 8
Views: 2,359
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, 06:29 PM
Replies: 4
Views: 3,164
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, 10:04 PM
Replies: 4
Views: 3,206
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, 07:20 PM
Replies: 17
Views: 3,706
Posted By pmullen503

What software do you use to vectorise?

What software do you use to vectorise?
02-29-2020, 06:00 PM
Replies: 3
Views: 4,042
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, 10:42 PM
Replies: 5
Views: 2,427
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, 05:01 PM
Replies: 13
Views: 16,693
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, 10:52 PM
Replies: 6
Views: 1,040
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, 08:41 PM
Replies: 6
Views: 1,040
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, 03:55 AM
Replies: 8
Views: 1,249
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, 08:08 PM
Replies: 8
Views: 1,249
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, 03:44 AM
Replies: 6
Views: 998
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, 04:57 PM
Replies: 9
Views: 1,985
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, 03:59 AM
Replies: 9
Views: 1,985
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, 03:41 AM
Replies: 9
Views: 1,985
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...
Showing results 1 to 30 of 500
 


 
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