Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

The Regular Stuff: Chat, Buy, Sell, Off Topic, etc. => General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc => Topic started by: Hero on March 10, 2019, 02:37:22 pm

Title: 5-cyl Radial
Post by: Hero on March 10, 2019, 02:37:22 pm

Just to help populate this area of the forum, here's a model radial aircraft engine. I can't take credit for building it, but I do congratulate myself for finding it in a basement last summer.

Title: Re: 5-cyl Radial
Post by: Hero on March 10, 2019, 02:38:15 pm

Oops! No attachment! I'll try again...

Title: Re: 5-cyl Radial
Post by: Hero on March 10, 2019, 02:40:42 pm

If I ever figure out the attachments. I'll add one😂

All right, here it is, I think.[attach=1]

Title: Re: 5-cyl Radial
Post by: crazydoug on March 10, 2019, 10:51:40 pm

Would love too see a video of that running!
crazydoug

Title: Re: 5-cyl Radial
Post by: St Paul Steam on March 11, 2019, 08:43:42 pm

Quote from: crazydoug on March 10, 2019, 10:51:40 pm

Would love too see a video of that running!
c the value of 25%
Ditto , that is lovely 😊

Title: Re: 5-cyl Radial
Post by: Hero on March 11, 2019, 08:50:30 pm

I hope to give it a try this summer. I am worried about the danger inherent in the propeller, though (I have a full-size one for it).

Title: Re: 5-cyl Radial
Post by: Adirondack Jack on November 26, 2020, 05:57:11 pm

Oddly enough, the big RC airplane props aren’t usually a problem.  It’s the little nylon ones that can cut the hell out of you.
For. The big ones, up to and including four to six horse engines, most guys just wear a work glove in case the prop comes around and smacks the back of their hands. But physics and geometry being rather inflexible, it takes a moment for the bigger, heavier props with a larger swept area to come around that first time.  You learn to do just as the fliers up to and including piper Cubs did.  You flip the prop while standing back away from it just a tad, so as you follow through with your arm swing, your hand naturally arcs out of the plane of prop rotation. 
All that said, flipping a 24 inch prop on a six horse motor with a hot battery ignition and timing fully retarded is no time to be napping.  They come alive almost invariably on the first flip, and are fully capable of breaking metacarpals.  I’ve been bit on a gloved hand, but never seriously injured.

Just make sure the engine is firmly secured so it can’t move, and flip the prop like you mean it, follow through so your hand approaches your leg after it leaves the prop, and don’t get stupid and reach through a running prop.   

Title: Re: 5-cyl Radial
Post by: Hero on November 26, 2020, 07:11:57 pm

I'm ashamed to admit that I chickened out last summer, so I will have to wait until this winter's snow has gone before I try again.