Mailing List flyrotary@lancaironline.net Message #63622
From: Patrick <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: Cheap strobe
Date: Fri, 11 Aug 2017 10:32:44 -0500
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>

You might want to look into a pulse width modulator.  Running a high-wattage LED at low wattage output will extend its life, but some PWMs may introduce high frequency noise.  Trade-offs…

 

Patrick

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Thursday, August 10, 2017 5:29 PM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Cheap strobe

 

Or, use less powerful LEDs, with no need to block or dim them...

;-)

On 8/10/2017 4:15 PM, Ernest Christley wrote:

Oops! You're right.  No 5W.  They were available a few years ago.

 

I see where you're going with the brightness.  I was looking at the regs, which don't point out a maximum brightness.  I don't guess regulators would have suspected that this much light would become so easy to install.  Reading the regs, it feels like they say, "This is what you have to do, because this is what we're doing."  But, now we're to the point where we have a constant glowing marker light that is as bright as the flash!!

 

You could be an aluminum shield in front of the markers to block some of the light, or paint the inside of some of the housing?

 

 

On Thursday, August 10, 2017 2:07 PM, Finn Lassen <flyrotary@lancaironline.net> wrote:

 

Well, if 10W LEDs are bright enough as strobes, then I would assume that you'd want less intensity for marker lights.
I would think that strobes normally are more then three times as bright as marker lights.

Where did you see 5W LEDs?

Perhaps 1W LEDs would be sufficient for marker lights, but only saw surface mount for the 1W red LED.

Finn

On 8/10/2017 9:48 AM, Ernest Christley wrote:

Finn, why would you dim marker lights?  Is there an upper limit on how bright the markers can be?  

There ARE limits on what area each can cover.  I handled this by designing the mount to block light from where it isn't supposed to be.

You could also use the 5W LEDs for markers.  That's what I have, because the 10W weren't there when I put the markers together.

But, I'd really like to know why you want to dim them.  I'm wondering if I'm missing something.

 

 

On Thursday, August 10, 2017 8:02 AM, Finn Lassen <flyrotary@lancaironline.net> wrote:

 

Great, but the while point is cheap!

Three strobes (wings and tail) plus position lights and possibly landing/taxi lights for less than $100.

If I could just figure out how to dim these LEDs for position lights.

[ ]

1
Update

   31516 OP

600 Lumen 10 Watt Super Bright, Green LED

$3.95  

$3.95  

[ ]

1
Update

   31515 OP

350 Lumen 10 Watt Super Bright, Red LED

$3.95  

$3.95  

[ ]

4
Update

   31539 PS

LED Driver, 30W DC Output, 110-260VAC Input

$8.95  

$35.80  

[ ]

8
Update

   31325 OP

1000 Lumen 10 Watt Super Bright, Cool White LED Module

$2.95  

$23.60  

[ ]

1
Update

   31557 PS

LED Driver, 10W Output, 12-24VAC/DC Input

$3.95  

$3.95  



Finn

On 8/9/2017 6:21 PM, Rogers, Bob J. wrote:

I use these in my plane. They work great.  Spruce part number is 11-14934 ...  http://www.aircraftspruce.com/catalog/elpages/navstrobesextant40.php

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Wednesday, August 09, 2017 3:36 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Cheap strobe

 

Not to burst your bubble Ernest but for those less likely to put something like that together ... when at Oshkosh this year, I went to Aircraft Spruce booth and a guy there was selling his own design of Nav/Srobe bulbs: a set includes one Red, Green White. All you do is remove the existing Grimes bulbs and replace the coloured Red/Green lenses with clear ones and insert his custom LED bulbs. No power supply required; no extra wiring required – use the existing circuit at much less current ~1.2A Vs 6-8A for a standard set.  They aren’t cheap: $318 normal price but I was very impressed and bought them at the show special of $286.  When you first turn them ON they are normal NAV lights; turn them OFF for 1-2 seconds then back ON and they begin to strobe.  Spruce part number is 11-14934 ...  http://www.aircraftspruce.com/catalog/elpages/navstrobesextant40.php

 

Jeff Whaley

Chubby Cubby, C-FJWW, 13B

 

From: Ernest Christley [mailto:flyrotary@lancaironline.net]
Sent: August-06-17 5:54 PM
Subject: Re: [FlyRotary] Re: Cheap strobe

 

Too much typing.  Try the youtube video I made.  Linked below.  Everything is put together with A3 pulled rivets.

 

 

 

 

LED Beacon Light

 

 

On Saturday, August 5, 2017 7:06 PM, Finn Lassen <flyrotary@lancaironline.net> wrote:

 

31325 OP and 31559 PS?

Pictures please. Having a hard time visualizing three LEDs creating a 180 degree dome mounting them in a triangle.

Is it possible to dim them to use for landing lights?

Finn

On 8/4/2017 11:04 PM, Ernest Christley wrote:

For nearly 15 years, this list has been invaluable to me, and it has been very seldom that I've been able to give anything back.  But, I hope this helps.

 

mpja.com has 10W LEDs for $2.95 each.  Each strobe takes three of them.  You also need the 30W power supply for each strobe.  Another $8.95.  I've put a scope on the input and output.  It doesn't generate much in the way of noise.  Just a constant current.

 

There is a seller on Ebay selling "Grimes wingtip light".  You can get two for $16 or one for $6.

 

In America, any of the chain auto parts stores carries the EP36 flasher from Novita.  Takes one for more strobes than you'll want to run.

 

Battery -> Strobe switch -> EP36 -> Input to each of the power supplies -> three LEDs in series -> back to power supply -> back to EP36 -> ground

 

Once set up, connect to a battery, but do not look directly at this beast.

 

For my first pass, I cut a strip of aluminum, 1"x3.5".  Folded into a triangle with 1" sides.  Rivet an LED to each side.

 

To fit it in the wingtip light, I'm cutting a piece of aluminum sheet to replace the bulb and rivet to the housing.  Where the light was, I'm cutting the aluminum and letting it fold up from the center to form three mounting faces where I'll rivet the LEDs.

 

 

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