Home Made Glowplug Conversion...Standard Cox Glowhead

nitroairplane wrote:Good results Kim!

Thanks !!! It'll suit a Redneck...

Love that picture. Although that is a little low on the RPM.

microflitedude wrote:Love that picture - what prop did you run?

I quote Kim "Prop is a cox 6-3"

nitroairplane wrote:

microflitedude wrote:Love that picture - what prop did you run?

I quote Kim "Prop is a cox 6-3"

Oops, missed it.

microflitedude wrote:

nitroairplane wrote:

microflitedude wrote:Love that picture - what prop did you run?

I quote Kim "Prop is a cox 6-3"

Oops, missed it.

It's OK we all do that from time to time.

Hey Kim, how long did it take you? How hard was it?

microflitedude wrote:Hey Kim, how long did it take you? How hard was it?

we are in live chat discussing it, come and join.

microflitedude wrote:Love that picture. Although that is a little low on the RPM.

It'll still drag my stuff through the sky as long as it's there...

microflitedude wrote:Hey Kim, how long did it take you? How hard was it?

Spent about three hours, but I was also chatting, making chili, and trying to give the dog his pills, so it wasn't exactly a focused effort!

The dog was good for 20 minutes of it...

I drilled out the center.
Tapped the whole length.
Ground a large bit flat on the end to make it a bottoming bit.
Kept working it deeper 'till the coil of the plug looked about even with the inside top of the chamber.

Kim wrote:

microflitedude wrote:Hey Kim, how long did it take you? How hard was it?

Spent about three hours, but I was also chatting, making chili, and trying to give the dog his pills, so it wasn't exactly a focused effort!

The dog was good for 20 minutes of it...

lol, I reckon with practise you could do this in 30 mins.

nitroairplane wrote:

Kim wrote:

microflitedude wrote:Hey Kim, how long did it take you? How hard was it?

Spent about three hours, but I was also chatting, making chili, and trying to give the dog his pills, so it wasn't exactly a focused effort!

The dog was good for 20 minutes of it...

lol, I reckon with practise you could do this in 30 mins.

Yeah...blindfolded, tied in a chair, upside-down, in a tank of starving Piranha !

Great post! I love it. Now to do it..... If you don't mind me asking, What size did you drill the head for tapping, also what size bit did you grind flat to get things deeper, and how did you grind it flat. This is a project I want to do as well. Thank you.

NEW222 wrote:Great post! I love it. Now to do it..... If you don't mind me asking, What size did you drill the head for tapping, also what size bit did you grind flat to get things deeper, and how did you grind it flat. This is a project I want to do as well. Thank you.

Hey 222,

Here's the stuff I used and what I did with it.

I'd gotten a 1/4 X 32 tap from Micro Fasteners. The Tap specifies a 7/32 bit, and this is what I used to just drill the whole thing through, from the bottom up, with the head stuck in wooden block.

I put the head in an old cylinder/case assembley to give me a way to hang onto it, and tapped the threads into it, holding the case with vise grips.

I then clamped it all in my drill-press, squaring up everything as close as I could get it.

I used a 5/16th drill bit to make a "crater" in the top of the head, going just deep enough for the flutes to contact and make a "rim".

Then, I used another 5/16th bit I'd hand-ground flat on the end to make a bottoming bit, and give the plug gasket as flat a surface as possible to seal.

I gradually worked the bit down through the head, stopping several times to clean the threads with the tap, and check the plug's depth.

When I got it pretty close, I cleaned up everything, and put a Fox bar-less Short Plug in it. As I'd mentioned, one of the fins broke off when I tightened the head onto the Black Widow, so a slightly smaller bit might be needed to leave a little more "meat" to keep the fins on.

That's about it. The Black Widow started right up and used all of it's fuel, with good-sounding RPM's hovering right in the 12 and-a-half range on a Cox 6-3. This would easily pull around any of my sailplanes or trainers, so I was pretty happy, and had fun making the silly thing.

Hope this helps!

It helps immensely! Thank you very much.

NEW222 wrote:It helps immensely! Thank you very much.

You're very welcome ! Glad to know my spent morning might actually help someone with their project !!!!!

SUPER INFO - THANK YOU - I AM IN THE MIDDLE OF THIS DILEMMA MYSELF - but I have to ask - you say the bernie or matt could sell you the part? ANY idea which adapter would work - I was on line with bernie yesterday - he said he could not tell me since he did not have a testors plug or engine to match up. I would rather buy one and bolt it on than try more experimenting - those efforts for me generally result in a lot of frustration. MUCH EASIER TO GIVE MY DOG A PILL!!!! THANKS- J

jeffle wrote:SUPER INFO - THANK YOU - I AM IN THE MIDDLE OF THIS DILEMMA MYSELF - but I have to ask - you say the bernie or matt could sell you the part? ANY idea which adapter would work - I was on line with bernie yesterday - he said he could not tell me since he did not have a testors plug or engine to match up. I would rather buy one and bolt it on than try more experimenting - those efforts for me generally result in a lot of frustration. MUCH EASIER TO GIVE MY DOG A PILL!!!! THANKS- J

I'm sorry, I was thinking about Cox engines when I typed that. While I think Bernie and Matt's glowplug adapters are all oriented toward Cox engines, this outfit has adapters for Testors...not sure if it's the model you've got, but might be worth a look-see.

Hope this helps.

http://www.mecoa.com/acc/adaptors/index.htm

http://www.mecoa.com/acc/adaptors/index.htm

scroll to the end... i think you might like what you find.

nice link kim

Cool!
I never imagined that MECOA would be selling them.

Ok. Now I have just finished my adapter. Thank you very much for your help. Will take and post pictures tomorrow or this weekend when time permits. Not sure when I will try running it though. Possibly this weekend as well, but realistically this spring.

I am happy you got it done and cannot wait for the pictures
Indra

Now make one for a Turbo plug instead and you might not loose all that rpm...