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Testors/McCoy .049 Pipe Bomb

Cox Engines Forum  :: Engines :: Non-Cox Engines :: Glow Engines

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Testors/McCoy .049 Pipe Bomb Empty Testors/McCoy .049 Pipe Bomb

Post  microflitedude Mon Nov 14, 2011 8:39 pm

Not sure if this one get's the same name as the nylon case as it's the cast (iron?) one. If I recall correctly, pipe bombs are made with PVC. Shocked lol!

The cylinder is not burred as I originally thought. Compression is good. Runs for a couple seconds on primes, needle valve was closed when it broke off. Somebody might have a spare back plug/NV. I made a new reed from floppy material which passes the suck-and-blow test.

Testors/McCoy .049 Pipe Bomb Hpim8717

Testors/McCoy .049 Pipe Bomb Hpim8718

Testors/McCoy .049 Pipe Bomb Hpim8719
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Testors/McCoy .049 Pipe Bomb Empty Re: Testors/McCoy .049 Pipe Bomb

Post  Kim Mon Nov 14, 2011 9:04 pm

That Poor Thing !
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Testors/McCoy .049 Pipe Bomb Empty Re: Testors/McCoy .049 Pipe Bomb

Post  RknRusty Mon Nov 14, 2011 10:37 pm

That looks like a high compression Cox head on the inside. Will a Cox fit it? What retains the reed?

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Post  microflitedude Tue Nov 15, 2011 6:46 am

This thing went through a serious beating. Very Happy

All the parts are a little bigger than an .049. The reed has no retainer - just slips under a lip on the back plug.
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Post  nitroairplane Tue Nov 15, 2011 7:36 am

This thing should be called the fugly duckling Smile
How does it run(if it does)
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Testors/McCoy .049 Pipe Bomb Empty She runs!

Post  microflitedude Tue Nov 15, 2011 2:25 pm

It shouldn't run, but it does. Smile

As described, the needle valve is broken inside the insert all the way screwed in - no fuel can get in through the nipple. I also removed the overweight broken spring starter.

I decided 2 second primed runs weren't satisfying enough, so here's what I came up with. Look anything like Soviet engineering? Popcorn It runs for about 15 seconds; I could do longer with the bigger syringe. Cranked it up, dropped the igniter and slowly pushed fuel in. It wasn't just put-puting, it was turning some good RPMS.
You might say I hand fed it. lol!

Testors/McCoy .049 Pipe Bomb Hpim8720

Testors/McCoy .049 Pipe Bomb Hpim8721
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Post  nitroairplane Tue Nov 15, 2011 2:28 pm

Thats clever!
I also know where that syringe came from!
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Post  microflitedude Tue Nov 15, 2011 2:29 pm

nitroairplane wrote:Thats clever!
I also know where that syringe came from!

Where? I know. Very Happy
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Post  nitroairplane Tue Nov 15, 2011 2:30 pm

Well i got one from a friend after finding it in his tooth whitening kit!
Watch out the rubber of the plunger breaks down over time.
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Post  microflitedude Tue Nov 15, 2011 2:32 pm

nitroairplane wrote:Well i got one from a friend after finding it in his tooth whitening kit!
Watch out the rubber of the plunger breaks down over time.

Haha, you get a thumbs up for that.
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Post  shell shock Tue Nov 15, 2011 2:35 pm

good show man!
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Testors/McCoy .049 Pipe Bomb Empty Re: Testors/McCoy .049 Pipe Bomb

Post  ideeman1994 Tue Nov 15, 2011 2:51 pm

Nice way to run a nearly-dead engine! Very Happy

You can always try to find a medallion-like spray bar, and use it as a replacement, so he'll be autonomous...
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Post  nitroairplane Tue Nov 15, 2011 2:52 pm

Yes or a spraybar from an average English diesel like i used in my "custom SS"
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Post  ideeman1994 Tue Nov 15, 2011 2:54 pm

Yeah, I've got one of those, but installed in a control line plane... I never actually got the engine in my hands, but it's a screamer for sure! Very Happy
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Post  nitroairplane Tue Nov 15, 2011 2:56 pm

ideeman1994 wrote:Yeah, I've got one of those, but installed in a control line plane... I never actually got the engine in my hands, but it's a screamer for sure! Very Happy

What engine?
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Post  ideeman1994 Tue Nov 15, 2011 2:57 pm

A McCoy engine, maybe a Pipe Bomb...
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Post  nitroairplane Tue Nov 15, 2011 2:59 pm

ideeman1994 wrote:A McCoy engine, maybe a Pipe Bomb...

oh cool run good?
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Post  ideeman1994 Tue Nov 15, 2011 3:00 pm

Yeah, it starts up nearly without priming, and I'm sure it peaks a 19k
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Post  nitroairplane Tue Nov 15, 2011 3:02 pm

wow thats better than most cox reedies.
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Post  microflitedude Tue Nov 15, 2011 3:05 pm

nitroairplane wrote:wow thats better than most cox reedies.

Kim got 15K with a 5x3.
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Post  microflitedude Tue Nov 15, 2011 3:07 pm

I forgot to mention the first time I cranked it I hadn't tightened the prop screw.

BRAAAAAAAAAAAAAAAAAA!!!!!! Shocked

I'm lucky I still have my hand in one piece.
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Post  nitroairplane Tue Nov 15, 2011 3:09 pm

that is about what a babe bee will do so that is about what i expect.
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