View Full Version : 5 cylinder radial with a proper propeller

05-28-2013, 07:37 AM
My project from 2011-2012 was a 5 cylinder radial aircraft engine. Here is the thread that I posted. http://bbs.homeshopmachinist.net/threads/59215-5-cylinder-radial-running
My initial attempts at running the engine with the 3 blade plastic propeller weren't very successful due to the lack of mass in the prop. Centrifugal force in miniature engines is one of the elements that can't be scaled down. To help out with the running and tuning I made up a brass flywheel for the engine. This would allow the carburetion and ignition settings to be played with at lower rpm's. Once I was close it was time to make up an aluminum propeller to replace the brass flywheel. The prop is 13.5 inches in diameter. It's made from 6061 aluminum. The hub is 2 pieces and clamps onto the blades which have a large boss on the bottom to secure the blades in place. The blades have an airfoil shape to them although they were left a little thicker for added mass. The pitch has been initially set to about 6.

05-28-2013, 08:46 AM
That is cool.
Your work never ceases to amaze me.

Paul Alciatore
05-28-2013, 12:36 PM
Purrs like a kitten! Beautiful! A work of art!

So when do you start on the plane. That sucker deserves to fly.

Norman Bain
05-29-2013, 05:45 PM
Super impressive work. Love the sound ... seems tourqie (if that a word spelt correctly) as well.

05-29-2013, 09:15 PM
Thanks for the great video Geo, much appreciated. Another fine piece of work.