View Full Version : Flyers...Meet Bikers...

Nicholas Carey
06-20-2006, 11:33 AM
From The Kneeslider (http://thekneeslider.com/archives/2006/05/10/radial-engine-powered-motorcycle/) comes word of this little number powered by a 110hp x 7cyl radial engine. The engine is Australian and comes from Rotec Engineering (http://www.rotecradialengines.com/). The bike was built by JRL Cycles (http://jrlcycles.com/) in Black Hawk, South Dakota, who is also a distributor for the Rotec engines.

More information on these bikes and its builder at





Phillip Allen
06-20-2006, 11:53 AM
how about doing one with a rotory engine...? :) (that ought to look like the rath of God coming down the road)

Phillip Allen
06-20-2006, 11:56 AM
looks like the chain might grab a pant leg

Nicholas Carey
06-20-2006, 12:14 PM
looks like the chain might grab a pant leg

What I want to know is why they didn't do a shaft drive? It's a perfect setup for it.

06-20-2006, 12:26 PM
Not much ground clearance for this bike.

An especially appealing thing about using a rotary (a Gnome, not a Wankel) is the lack of throttle control. Imagine blipping the kill switch to stay with traffic, blowing Castor oil smoke behind you all the way. The torque might make steering interesting, too.

John Bell
06-20-2006, 12:42 PM
99% of the current chopper craze leave me cold. But this is the coolest chopper ever! Thanks for sharing.

Phillip Allen
06-20-2006, 12:44 PM
"Castor oil smoke behind you all the way"

that oughta keep the trips short! (the old dog fights involved short trips too)

John of Phoenix
06-20-2006, 12:55 PM
Clearly built for tough guys.
Check out the seat. Groan...

06-20-2006, 01:00 PM
Shouldn't the speed ring go in front of the engine?

06-20-2006, 01:21 PM
I think the thing that looks like a speed ring just behind the engine might be an exhause pipe shield to keep the rider from burning his legs on the 7 exhaust headers.

Speaking of headers, do they come together somewhere, or are they just short pipes that end behind the cylinder heads? I don't see any headers except the twisty ones in the lower photo, and it isn't clear where they end.

Nicholas Carey
06-20-2006, 01:29 PM
I like this one:


BTW, from the pictures, it looks like the exhaust headers are routed around the ring aft of the engine and maybe exhaust below the bike.

Phillip Allen
06-20-2006, 01:35 PM
Now THERE is where a rotory will work!

06-20-2006, 01:48 PM
Put a rubber tire around the whole rotary engine and use it like a drive wheel! Hard to get moving from a full stop, though.

Paul Pless
06-20-2006, 03:41 PM
how about doing one with a rotory engine...? :) (that ought to look like the rath of God coming down the road)

Egads, think of the gyroscopic/torque effects on handling!

Phillip Allen
06-20-2006, 05:55 PM
I occasionally have to operate a gasoline powered cutoff saw with 14 inch blade...ya gotta know how to handle them things because they have a mind of their own!

Bob Adams
06-20-2006, 10:21 PM
Egads, think of the gyroscopic/torque effects on handling!

I was thinking the same thing. Prolly be an OK dragster though.

P.I. Stazzer-Newt
06-21-2006, 04:54 AM
The chop pillocks often think they're ahead of the game.

Five Cyl rotary 640 cc

Been done. in 1925 by the Japanese - and front wheel drive.


John Meachen
06-21-2006, 02:52 PM
Can we safely assume that you might not be a great fan of this form of hobby?

P.I. Stazzer-Newt
06-21-2006, 04:36 PM
Can we safely assume that you might not be a great fan of this form of hobby?

Aye, you could say that - while it's true that bikes are not really about practical transport - as Royce Creasey said "The Gold Wing does nothing you couldn't do better, cheaper and warmer with a secondhand Anglia van" I can't help feeling that a bike should work as some sort of transport.
You should be able to look at the bike an know the road it fits - or some of the roads where it will raise a grin.

I've seen;
Ballaugh to the Bungalow (both ways).
Hardknot and Wrynose in high summer.
The A12 in rush hour in November.
Hartside in freezing fog.
Newcastle to Surrey in continuous rain.
Lomondside to Campbeltown starting at 3am on the summer solstice.

And there's not one of those bikes I'd want to repeat any of those journeys on.
Too often these are nothing more than sculpture and far too often it is from the "Welding torch and uncorrected astigmatism" school.

Someday I'll settle down and be a grumpy old man.