5 cylinder Radial Engine

[DavidR8]

Wow, just wow. Amazing work Ray. And done in just two months.

 

[Ben17484]

Thanks francist

Video of the first run of my radial engine.

The electric motor is used to spin the crank shaft for starting before the prop is installed.
The engine is actually running on 4 cylinders in the video as one cylinder has a exhaust valve problem that needs to be sorted out.

Thanks for looking
Ray

Now that is extremely cool. Thanks for sharing with us all.


Sent from my iPhone using Tapatalk

 

[rdean]

I want to thank everyone who commented and left likes on this build. It does make a difference.

The engine is firing on all 5 cylinders now just some trash in the valves of head number 3. I think I may have a vacuum leak in one or several of the intake runners so the Tygon tubing will be here tomorrow and I will replace all of the runners.
I still need to make the prop peg/key to secure the prop and spinner to the crank. I don't want it to unscrew when by turning it via the spinner.

Still some work to do and then a nice longer video with the prop.

Thanks for looking

Ray

 

[rwm]

Sweet!

 

[rdean]

I have been concerned for some time that when I installed the prop and tried to start the engine that the prop would unscrew itself from the crankshaft. I came up with this solution to drill a blind hole in the magnet ring that matches the prop and the spinner and insert a steel pin to lock all three together. The magnet ring is keyed to the shaft so the torque on the spinner is transferred directly to the crank shaft via the pin.


The rest of the parts.


My good friend Chris offered to loan me his flexible plastic starting cup to spin the prop over. I made a housing for the cup that would also fit in my battery drill.




This is the moment I have been working for.

I will be doing some more tuning on the engine in the coming days but I proclaim this build
COMPLETE

Thanks again to everyone
Ray

 

[francist]

Way cool, Ray! Just super

 

[DavidR8]

So awesome Ray. I’m completely envious of your skills.
One day, one day!

 

[savarin]

As your not into R/C planes Ray maybe it should go into something like this

or this

 

[rwm]

What RPM is it running at in the video? How is the throttle response? I wonder if there is any way to estimate the HP?

Well there's this idea:

Fuel Flow Calculations for Horsepower – performancedevelopments.com

Assume an efficiency of 30% and measure fuel consumption and you will likely be close.

 

[rdean]

David, Francist thank you again.
Savarin I am just trying to imagine riding one of those bikes. They look like a good way to hurt yourself.

Robert I am not totally happy with the way the engine is running so I will be doing some more tuning in the future. I usually put 3/4oz of fuel in the tank and it lasts about 3 minutes of running but I don't know the rpm during that time.

Ray