Author Topic: 'Tiny' air cooled hit and miss engine. (Read 10056 times)

gbritnell · « **on:** April 01, 2016, 03:30:00 AM »

As the name implies this is a tiny engine. Designed and drawn by a fellow named Arv, alias PutPutman, on another forum it had a tremendous following and quite a few versions were built.
Another gentleman named Gail added his own variations to the design and came up with a mechanism for making it a hit and miss engine rather than just a constant speed engine.
I really enjoy making miniature engines and models so I jumped into the fray and built my own engine with a few modifications to improve things that other builders found troublesome along the way.
This was a couple of years ago and while I'm waiting for some decent weather to try out the flathead engine I decided I needed to build my own variation of the original. This would be an air cooled version.
I made some changes to the original basic design like threading the cylinder into the base, 1/2-40 thread. Next was to lengthen the base to allow more room for the filler spout at the rear. On this engine I used ball bearings to support the crankshaft rather than plain bearings. I wanted to make it a true hit and miss engine so using a couple of the parts that were donated to me during the first build I came up with my own variation on Gail's design. This one uses more of the traditional link setup found on larger hit and miss engines. To accommodate all the bits and pieces the gears, bolts and brackets needed to be modified to fit into the allotted space.
The engine has a Hall trigger for the ignition. The Hall transistor sits in a small bracket mounted on the side of the base. The 1/8 magnet is pressed into and aluminum disc.
The base and fuel tank are aluminum. The cylinder, head and flywheels are cast iron. The crank is 1144 steel turned from one piece. The rod is aluminum with split bearing inserts.
The spark plug has an 8-36 thread and uses Corian for the insulator.
I only have the fuel line to finish but have to wait on some 1/16 brass tubing for that.
gbritnell

Don1966 · « **Reply #1 on:** April 01, 2016, 03:53:50 AM »

Although I know it's small, I still need to see it next to a reference.

Beautiful work George but you know I have to ask.

Are we going to see some plans for download?

Don

toolznthings · « **Reply #2 on:** April 01, 2016, 04:00:55 AM »

Hi George,

Always amazing work !

Brian

Roger B · « **Reply #3 on:** April 01, 2016, 07:47:56 AM »

Very nice indeed

I eagerly await the first pops

b.lindsey · « **Reply #4 on:** April 01, 2016, 02:56:57 PM »

Beautiful as always George. I do remember that one from the other forum too and it was most impressive!

Bill

gbritnell · « **Reply #5 on:** April 01, 2016, 05:18:14 PM »

Thanks fellows,
Don, here's a shot with a quarter sitting next to it for a size comparison.
gbritnell

putputman · « **Reply #6 on:** April 01, 2016, 05:57:41 PM »

George, thanks for introducing Tiny A C to this forum. I have followed your build on the other forum and am just fascinated at the way you & Gail are able to cram all the governor mechanism into that small area. Looking forward to see this Tiny running.
For anyone wanting to build a Tiny, the original prints are on my web site. They are in a PDF form & can easily be downloaded. I hope to see more builds and more modifications on this site.
Arv

www.putputman.com

Tennessee Whiskey · « **Reply #7 on:** April 01, 2016, 06:57:37 PM »

Now just why do you want to go and tempt me with this kinda build, dammit man

,We'll just have to sip this over at NAMES.

Cletus

crueby · « **Reply #8 on:** April 01, 2016, 09:13:18 PM »

Quote from: gbritnell on April 01, 2016, 05:18:14 PM

Thanks fellows,
Don, here's a shot with a quarter sitting next to it for a size comparison.
gbritnell

Wow! Lot smaller than I thought, should have known seeing that its your build. Very nice!!

After working on the tiny engines, does your brain explode when you open the hood on your car and see that monster big engine?!

crueby · « **Reply #9 on:** April 01, 2016, 09:18:14 PM »

Quote from: putputman on April 01, 2016, 05:57:41 PM

George, thanks for introducing Tiny A C to this forum. I have followed your build on the other forum and am just fascinated at the way you & Gail are able to cram all the governor mechanism into that small area. Looking forward to see this Tiny running.
For anyone wanting to build a Tiny, the original prints are on my web site. They are in a PDF form & can easily be downloaded. I hope to see more builds and more modifications on this site.
Arv

www.putputman.com

Just over checking out your site, some great stuff! Thanks for the link!

Tennessee Whiskey · « **Reply #10 on:** April 01, 2016, 09:21:40 PM »

George is my kinda fellow, now, the ladies might not agree, but, George says size don't matter

I'm just shickled titless that in a few weeks I get to shake his hand

Cletus

Already got his autograph

b.lindsey · « **Reply #11 on:** April 02, 2016, 12:07:45 AM »

Arv, good to see you over here in MEM. Hope you will decide to be an active member. Very nice website by the way!!

Bill

gbritnell · « **Reply #12 on:** April 02, 2016, 01:10:21 AM »

Cletus,
I'll certainly be looking forward to it.
I'm working on a set of drawings showing all the changes, and only the changes that I did in making this engine. You would still need Arv's drawings for the basics. I'm also including the bits and pieces for the governor mechanism.
gbritnell

Dave Otto · « **Reply #13 on:** April 02, 2016, 01:29:00 AM »

Beautiful George!

I too am looking forward to being able to see this and all your other spectacular engines later this month at NAMES.
If I can push Eric out of the way I might even be able to shake your hand too.

Dave

rudydubya · « **Reply #14 on:** April 02, 2016, 01:53:59 AM »

Always a fan George. Impressive work as usual.

Regards,
Rudy

Art K · « **Reply #15 on:** April 02, 2016, 04:44:39 AM »

George,
I'm with the rest of the guys the tiny looks great. And I look forward to seeing you and the rest of the guys at NAMES!
Art

fumopuc · « **Reply #16 on:** April 02, 2016, 06:12:19 AM »

Hi George, this Tiny is pure art, I like it.

tvoght · « **Reply #17 on:** April 02, 2016, 01:16:11 PM »

Wow, the two-bit piece does really bring it into perspective. Another stunner.

--Tim

kvom · « **Reply #18 on:** April 02, 2016, 05:50:53 PM »

I've seen other small engines from George. In comparison that one is pretty big.

Dreeves · « **Reply #19 on:** April 03, 2016, 03:48:09 AM »

George, First off great looking engine

second where is the video of it running?

DAVE

zeeprogrammer · « **Reply #20 on:** April 03, 2016, 12:00:51 PM »

Awesome work George.
Simply amazing craftmanship.

gbritnell · « **Reply #21 on:** April 03, 2016, 12:51:09 PM »

Coming soon Dave. I just received the 1/16 brass tubing yesterday so I can make up the fuel line.
gbritnell

90LX_Notch · « **Reply #22 on:** April 03, 2016, 01:23:15 PM »

Very nice George.

Arv- Thanks for posting the link for the drawings. I've always been interested in this engine since you posted it years ago on the other site.

-Bob

gbritnell · « **Reply #23 on:** April 05, 2016, 05:24:28 AM »

As promised here's the video. I have never used the Movie Maker software so I went to Youtube to learn how to do it. I added the title block, threw in some pictures and added a second video at the end.
I initially started the engine with my airplane starter but found out that it would start by hand. I think I'm going to take the original one apart and make a lapped piston for it also.
gbritnell

<a href="https://www.youtube.com/watch?v=mbiM_qRLj8M" target="_blank">http://www.youtube.com/watch?v=mbiM_qRLj8M</a>

sbwhart · « **Reply #24 on:** April 05, 2016, 06:46:58 AM »

That is superb George

Stew

Jo · « **Reply #25 on:** April 05, 2016, 08:00:46 AM »

Very nice George.

Another to add to my build list

Jo

wagnmkr · « **Reply #26 on:** April 05, 2016, 11:08:52 AM »

She purrs like a kitten George ... but then what else would we expect from you.

Inspirational to say the least.

Cheers

Tom

Dave Otto · « **Reply #27 on:** April 05, 2016, 01:39:14 PM »

Very nice George!

Dave

Don1966 · « **Reply #28 on:** April 05, 2016, 03:48:09 PM »

That is amazing George and I expected no less, just some exceptional work all around. Your still my hero buddy.......

Don

b.lindsey · « **Reply #29 on:** April 05, 2016, 06:29:34 PM »

Wonderful George, thanks so much for the video. The hand cranking there at the end really gives a good idea of how tiny this engine is!!

Bill

crueby · « **Reply #30 on:** April 05, 2016, 07:05:17 PM »

Simply spectacular! Till your fingers were in the frame I would have sworn it was several times larger! Another beautiful engine!

Roger B · « **Reply #31 on:** April 08, 2016, 09:13:51 AM »

Splendid

It started remarkably easily by hand

Alan Haisley · « **Reply #32 on:** April 08, 2016, 04:54:19 PM »

Great work, George. I love it.

Alan

fumopuc · « **Reply #33 on:** April 09, 2016, 07:14:54 AM »

Hi George, a very nice tiny engine and very well made, as usual. Seeing it with your finger in the video giving an idea about the real size. After doing two long time engine projects after each other now, the Snow engine is still ongoing, I get a kind of special understanding for such a shorter project. My next project will be definitely a short one too.

gbritnell · « **Reply #34 on:** April 09, 2016, 01:47:48 PM »

Thanks again everyone.
Achim, yes it's good to just get away and do a quick project to clear a person's head. Long projects are nice but tend to get tedious.
gbritnell

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Author Topic: 'Tiny' air cooled hit and miss engine. (Read 10056 times)

toolznthings