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  #121  
Old 02-09-2014, 01:38 PM
ron sterba ron sterba is offline
 
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Location: salem Oregon
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Hey Mike are you using a airframe ground? I was told to start running a ground wire back to the buss and put in 7-9 twists of the light/taxi wires in bundle per foot. This should reduce induced noise thru the wiring. I used this in my professional line of work. Can't see why it shouldn't work here. Worth a try. Let know if it works.
Ron in Oregon
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  #122  
Old 02-09-2014, 02:09 PM
Dorfie Dorfie is offline
 
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Location: Lexington, KY
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[quote=Omega232Devils;850943]Just a quick teaser, I plan to do a better write up later. For now, here are the cliff notes:

After talking to Rocket Bob, I purchased 4 of these LEDs ($26 total):

http://www.kaidomain.com/Product/Details.S009985

QUOTE]

Dan,
I bought the same LEDs after a posting from Rocket Bob some time ago. The first set I got looked like the picture in the link, specifically with the red ring at the back. A second order shipped LED's, some with red and some with black ring at the back. They look exactly the same apart from the red vs black ring. The ones with the black ring blew right off the bat when connected to 12V battery.. The red ones would light up, stay on for about 30 sec then start flashing. They also got VERY hot, to the point that it will burn your fingers. Too hot too handle. I have tried a variety of in line resistors, 5 - 100 ohm, in which case the resistor got too hot to touch. I used resistors up to 100W. I eventually gave up. I made a mount that held three of the small LED's you've got, plus one of the three LED CREE from Dealextreme, ones that Rocket Bob mentioned as well. I now have two of the 3 LED CREEs (as landing lights) as well as the 75W VANS Halogen (wider angle for taxi) installed in the wingtip in a home made bracket. I am feeding power to the LEDs through a 5 ohm resistor, and no excessive heat anywhere. Not flying yet, but had them on for hours, and seems to work well. Very little heat palpable through wingtip.

So, I was wondering how hot does yours get? Did you drive them through a resistor? Would like to know more about the setup please.

Keep an eye out for the ones with the black ring at the back.

Johan
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  #123  
Old 02-09-2014, 02:56 PM
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Toobuilder Toobuilder is offline
 
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Quote:
Originally Posted by ron sterba View Post
Hey Mike are you using a airframe ground?
Local ground on the tip rib only.

Another interesting thing is the fact that these things sing externally now. Meaning, they make audible noise when you are standing next to them. They chirp, beep and click, depending on their mode. Weird.
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  #124  
Old 02-09-2014, 03:07 PM
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catmandu catmandu is offline
 
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Quote:
Originally Posted by Toobuilder View Post
Another interesting thing is the fact that these things sing externally now. Meaning, they make audible noise when you are standing next to them. They chirp, beep and click, depending on their mode. Weird.
Chinese nanobot mating call?
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  #125  
Old 02-09-2014, 03:42 PM
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rocketbob rocketbob is offline
 
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Quote:
Originally Posted by Toobuilder View Post
I have about 20 turns through a big ferrite and I think it actually increased the noise! There will definitely be some tuning involved, but this installation seems to be worth the trouble.

More to follow.
Entirely possible. Inductive reactance. Are both the power and ground looped thru the ferrite? Mine are.
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  #126  
Old 02-09-2014, 06:45 PM
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Toobuilder Toobuilder is offline
 
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Thumbs up FIXED!

Took the wingtip off today, disconnected the ferrite lead and went straight to the battery. They got quiet externally, but still showed up on the comm. OK, let's make less turns though the ferrite and see where it starts to sing. Turns out, ONE 360 loop makes them squawk.... OK, how about just running the wire straight through the ferrite with no turns? That did it. Just flew it, and yep, they are dead silent now.

Happy days!

The ferrite I'm using came with my flat screen TV. They are about an inch in diameter and a little more than an inch in length. They are supposed to snap over the various cables in the TV.

Planning on getting some movies of the airplane on YouTube soon so you all can see the various modes in action and the comparison to the 100w GE bulb on the other side.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.

Michael Robinson
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RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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  #127  
Old 02-09-2014, 08:46 PM
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Omega232Devils Omega232Devils is offline
 
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Sorry it has taken me awhile to get back to you guys, I took the RV on a snowboarding trip to Mammoth, CA.


Quote:
Originally Posted by scootwoot View Post
Dan, did you add any additional heatsinks to these bulbs? love to see how you mounted them.
- I did not add any additional heatsink. I did mount them in .04 aluminum attached to the standard duckworks mount in the leading edge.

Quote:
So, I was wondering how hot does yours get? Did you drive them through a resistor? Would like to know more about the setup please.
- I had them on a bench running off and one for over an hour. Most continuous was 30 mins. They did get warm to the touch, you wouldn't hold them in your hands, but they weren't "HOT". I have borrowed a laser thermometer and will take measurements as part of my write up.
- I am not driving them through a resistor, just unpluged the HID lights and plug in LEDs.
- The four lights I have all have the red rings on the back like you mentioned. I will keep an eye out for the black ring lights. I did have one light, that after 20 mins of run time began to flash. I will be replacing that one soon. I believe I received one of the 3 mode LED lights by error and accidentally put it in a flashing mode.

I have ordered 4 more of the LEDs with different reflectors. I will take more pictures and do a better write up in a few weeks. (Lights take a couple weeks to arrive from Hong Kong)

Dan
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  #128  
Old 02-12-2014, 10:41 AM
Canadian_JOY Canadian_JOY is offline
 
Join Date: Aug 2007
Location: Ontario, Canada
Posts: 2,291
Default Trustfire more like TrustPffffffft!

Bought a pair of the 3-led Trustfire lights as recommended way back in this post. They are the "other" version with the additional heatsink fin and no spring for the negative (-) power connection, only a single spring for the positive (+) power connection.

Connected the first one to a bench power supply and immediately drove the power supply into current limit mode. Yup, the light was a dead short, straight from the factory. ****.

Second light is NOT a dead short, so at least I'll have one to play with.

At this rate, it will likely be cheaper in the long run for me to either stick with my original plan of using an LED Maglight head or go with the Baja Designs lights. One can't keep dropping 25 bucks at a time for very long before the additional cost of a Baja light is covered!
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  #129  
Old 02-12-2014, 10:49 AM
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Toobuilder Toobuilder is offline
 
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Fortunately, Amazon has a very liberal return policy.... Knowing these lights have questionable quality, I test them all before I start modification. I'll also likely buy a 5th unit to keep around as a spare.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.

Michael Robinson
______________
Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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  #130  
Old 02-13-2014, 12:10 AM
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Bob Ellis Bob Ellis is offline
 
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Mike/Michael/Catmandu

Thank you all for your great write ups and carrying out the pioneering work that will help others who follow and to Rocket Bob for supporting them.

Like many I have the Vans MR16 light cluster and the ideal solution would be drop in MR16's. I tried this but I had RF issues above 126.0 and ferrites actually reduced that to above 125.0 (see my post)

Michael you say no RF issues with the wire running through the clamp-on ferrite but can I ask have you tested the radio over the full frequency range?
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Last edited by Bob Ellis : 02-13-2014 at 12:34 AM.
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