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aeronca65t
07-19-2007, 09:55 PM
One of my college kids sent this to me this week.

If you like planes and bikes (as I do), you will probably find this at least interesting.
(but part of me says it would have been smarter to put this engine in an airplane....oh well).

https://img.photobucket.com/albums/v170/aeronca65t/ccm_mech_projects/radial-engine-bike.jpg

Steve
07-19-2007, 10:13 PM
A lot of work went into that didn't it? I agree, radial engines are better suited to aircraft, motorcycles need the low centre of gravity that a conventional engine would provide.

tony barnhill
07-19-2007, 10:26 PM
I'll bet that's a "hummer" to ride...firing all way around that circle!

davelgee
07-20-2007, 10:31 PM
Mergola did it better, but still, it didn't work all that well! All that spinning mass would lead to "interesting" handling effects! At least Harley had the good sense to cut these engines into slices, but the wiley Italians did that better too and got a 90deg twin with a bit of balance.

Cheers!
Dave G.

aeronca65t
07-21-2007, 05:43 AM
I didn't have a clue what a "Mergola" was, so I googled it.

Turns out that a "Megola" is an old German bike with a radial five in the front wheel (with no clutch...direct drive). Interesting!

The red bike below is a Megola

Also, below that, another "radial chopper"

https://www.vintagebike.co.uk/Bike%20Directories/OthersItoM/images/Megola-1922-25-1.jpg


https://thekneeslider.com/images/radialmotorcycle.jpg

Steve
07-21-2007, 08:14 AM
That radial chopper would be even worse to ride! Can you imagine the effect that the torque has on the handling in that configuration?

Aaaack!

malice
07-21-2007, 09:45 AM
Yeah but how does it fire? One cyl at a time? If not it could be set to offset itself? Maybe im only making sense to myself. I am tired.

aeronca65t
07-22-2007, 04:14 AM
OH yeah, speaking of aviation and bikes...and since this is supposed to be a section on British bikes, here's a bike with a "slice" of a Merlin V-12

https://www.geocities.com/b0b_e/merlinvtwin.jpg

tony barnhill
07-22-2007, 01:50 PM
With NOS to less!!

lawguy
07-23-2007, 11:19 AM
Trying to evaluiate the radial chopper as a long distance cruiser misses the point. It is a matter of kinetic art and unmitigated cool. On those points, it scores well.

Steve
07-23-2007, 11:38 AM
Trying to evaluiate the radial chopper as a long distance cruiser misses the point. It is a matter of kinetic art and unmitigated cool. On those points, it scores well.

I would agree that as a work of art, it is nothing short of amazing, but I always felt that the point of building a motorcycle would be to make it at least rideable. I don't know about a long-distance cruiser, I think that you would be in mortal danger just riding it to the local gas station! /bcforum/images/%%GRAEMLIN_URL%%/wink.gif

MikeP
07-27-2007, 11:24 AM
I wonder if you could even ride it on anything but the smoothest pavement. Looks to me like it would hit the lowest rockers if you hit a bump or small hole. Still, impressive engineering.

Twosheds
08-03-2007, 07:00 PM
Yeah but how does it fire? One cyl at a time?

Yes. The crank has only one throw. You are really taxing my poor old brain, but if I recall correctly, the firing order for a seven cylinder radial is 1 - 3 - 5 - 7 - 2 - 4 - 6.

Bugeye58
08-04-2007, 05:09 PM
Sheds, now let's confuse 'em with how everything rotates without getting tangled up! /bcforum/images/%%GRAEMLIN_URL%%/devilgrin.gif
Jeff

aeronca65t
08-05-2007, 05:41 AM
I looked inside one once....it looks like it could make it around just once before everything would turn into spaghetti.

And of course then, there's ~The Gnome~ (https://www.youtube.com/watch?v=P_-HhEfH1XQ)

Bugeye58
08-05-2007, 10:53 AM
Here's one that may be a little too large for a bike. All 4360 cubic inches of it!
Jeff

SilentUnicorn
08-05-2007, 05:38 PM
https://www.youtube.com/watch?v=Z2ChXmMiXjY&mode=related&search=

Bugeye58
08-05-2007, 05:55 PM
Mark, that looks like an old R1820. Ya gotta love the sound of those inertia starters. /bcforum/images/%%GRAEMLIN_URL%%/thumbsup.gif
Jeff

Twosheds
08-05-2007, 06:26 PM
Sheds, now let's confuse 'em with how everything rotates without getting tangled up! /bcforum/images/%%GRAEMLIN_URL%%/devilgrin.gif
Jeff

I wonder if you can still get the Visible Radial model. We had one at the school. It was like the Visible V-8 or Visible Man.

We also has a Kinner 5 cylinder radial cut-away that rotated at 2 RPM by an electric motor. It's in the Hagerstown Aviation Museum now. Hypnotic.

The Udvar-Hazy Facility has an R-985 (I think) that rotates and opens up when you push a button. Cool.

lawguy
08-08-2007, 03:22 PM
A radial, I understand...impressive engineering, but I understand it.

A rotary (not to be confused with a Wankel), on the other hand, is voodoo.

https://www.youtube.com/watch?v=A16EW19oR6k&mode=related&search=

aeronca65t
08-08-2007, 03:53 PM
If you like old rotary engines, you have to go to Rhinebeck and see ~THIS~ (https://www.oldrhinebeck.org/collection/airplanes/Bleriot%20XI%20X-country.htm) Gnome-powered Bleroit running.

I've seen it....they only do short "hops" with it, but still pretty cool.

They have another rotary "display" engine that's missing a jug. It flew off in the air!

racingenglishcars
11-09-2007, 03:10 PM
The Sopwith Camel (from beagle fame) had a rotary.
It isn't voodoo, just the block and cylinders are mounted to the prop. the crankshaft is mounted to the airplane. They use a slipring arrangement for inlet air. Exhaust just blows out from the head. Ignition is magneto on the block.

aeronca65t
11-10-2007, 06:41 AM
By the way, those old rotary engines did not have a carb or throttle. They ran full speed all the time (fuel was sprayed into the "manifold". The hollw crank shaft served as part of this manifold).

To "throttle" the engine, the pilot shut the igniton on and off....."blipping" the engine for landing.

These engines had a total-loss lubrication system that used castor oil mixed with the gasoline. The choking exhaust fumes covered the pilot with oil and often lead to persistent diarrhoea as well!