this is for my LED lamps. they are housed in a 26 mm copper tube that gets to about 50 degree C.

I am looking of a way of fitting a finned heatsink over the tube, a bit like you can get for ransistor cans or exhaust collars on air cooled motorcycles.

Two ideas spring to mind - bend a piece of ali sheet and attach - not sure I can do the bending nor how to ensure there is maximum contact with the tube - top piccy.

Or get some thick aluminum, chain drill and , file down to make fins and big hole in centro to slip over tube - that seems a lot of work - bottom piccy.

so any other ideas?
Rescued attachment hsink.JPG

what do these lamps do? surely not chav blue LEDs lighting up you engine bay? Sound quite big too.

tut tut , who's not been paying attention?

these are mountain bike LED lamps - yep - I realised I'd posted in wrong section.

They use 5 W emitter - photo shows with 3 W driver but I have since got 5 W drivers that make them blinding, literally!!
Rescued attachment lamp.JPG

What about using an Oil filter cooler or a cut down version of one to fit your needs?




[Edited on 22/1/09 by Alfa145]

^^^ yeah - did consider that but oil cooler is about 3 x diameter; alloy would probably break if bent to the smaller radius.

i was just gonna suggest modding an oil cooler wrap

its the best idea and not worth bothering with anying else imho

EDIT
you could anneal it to prevent it breaking, didn't realise the disparity in the dims

[Edited on 22/1/09 by liam.mccaffrey]

[Edited on 22/1/09 by liam.mccaffrey]

Maybe or maybe not with a bit of heat and a hammer?

How about making a few copper washers with a 26mm hole and soldering them on the tube?
Rescued attachment colling.jpg

^^^ interesting - but the air flow would be wrong for the discs, unless there is a strong side wind.

Check out some of the RC car sites, they do heat sinks for the motors, that might be suitable.

Regards

John

^^ exactly right there quite common, also try miniture indoor heli's as the motors tend to be smaller than the cars

type 'electric motor heatsink' into google images



How much are these LED BTW? I need one very bright light for the wing mounted landing light of a large r/c piper cub. This LED seems just perfect for it.



[Edited on 22/1/09 by Mr Whippy]

depends where and what you buy.

the high power LED - emitter - is about £ 5.99

then you need a driver, these wil cost £ 5 - same seller as the linky.

you then need to have a lens and lens holder, maybe a couple of quid. (I got mine from Germany).

and a battery - I am using an RC 7.2 V battery, about a couple of quid + lots for postage; price depends on capacity. "search rc battery 7.2v" on ebay

then you need a charger, about a tenner from maplins or ebay.

then some method to hold it all together, I made lamp holder from copper plumbing tube.

[Edited on 22/1/09 by 02GF74]

Can you do a wiring diagram and parts list, this is something i've always fancied doing.

Regards

John

quote:

---

Originally posted by 02GF74
depends where and what you buy.

the high power LED - emitter - is about £ 5.99

then you need a driver, these wil cost £ 5 - same seller as the linky.

you then need to have a lens and lens holder, maybe a couple of quid. (I got mine from Germany).

and a battery - I am using an RC 7.2 V battery, about a couple of quid + lots for postage; price depends on capacity. "search rc battery 7.2v" on ebay

then you need a charger, about a tenner from maplins or ebay.

then some method to hold it all together, I made lamp holder from copper plumbing tube.

[Edited on 22/1/09 by 02GF74]

---

I gather the discs didn't work then ?

re: discs - I have not run the lamps with the discs yet. plan to do that tonight.

My feeling is that although there is more mass, the cooling will be via radiation/convection from the outside of the tube.

The will be run outside where air is cooler plus there will be air flow so it may not be an issue.

the concern is that I plan to put the driver inside the lamps where it gets quite hot - that may kill the drivers so there may nbe a mk2 version based on a 1 inch alumninium rod.

to give an example:


shows the alloy housing that is the heatsink.

bear in mind that mine will be 2 x brighter hence more heat generated. those cost £ 175, mine probably £ 20 ish.

[Edited on 22/1/09 by 02GF74]

Standard R/C motors are actually name accourding to their diameter

The closest one to yours is a 280 motor.

You can get this

[img]http://shop.avicraft.co.uk/product_thumb.php?img=image/5510329.jpg&w=190&h=122[/img]

for £1.94!!!! It's 280 but the gap at the top should allow some easy modifications...

linky

Bizarre

good find - nice colour 2!!

Cut the oil coler in in half and strap two halves to your light?

Pat...

What you want is one of these

Description


If you can find them let me know. I have a mate in the electronic business who is looking for them for me.

These are from the states

http://www.qats.com/product.asp?prodid=2464


The unit above is from emergency lighting from
http://www.inotec-licht.de/Home.131.0.html

ATB

Moss

[Edited on 22/1/09 by LoMoss]

Try Wakefield Engineering http://www.wakefield.com

The 301/302/303 series look close.
http://www.wakefield.com/products/catalogs/extruded_heat_sinks_45-52.pdf

Farnell supply Wakefield sinks, but they are from the states so P+P is silly money.