Vintage Rotary Engine TOO COOL

thevintageaviator.co.nz/projects/oberursel-engine/urii-action


Very Cool

Thanks for posting. That thing is beautifully machined. I have run both of the machines that they show in the videos of the parts being made. No flywheel necessary there. Even the prop is purty.

Youre welcome I like the way they run it.Full throttle.Spark then no spark.Just the way they ran em way back when.
You have 3 options
1 Takeoff
2 fly
3 Land (or control your crash)
Id give er a try
No insurance needed

I had a friend that had an R5 Suzuki Rotary bike in the 70's. Funny sounding bike compared to the inline 4 with a header.

nice, even if these motors are called radials, or aero radials, not rotaries

by rotary you usually mean a wankel as Kawickrice said here

they had the advantage of cooling the motor better by the forced flow over the cyls.

Kawickrice wrote:

I had a friend that had an R5 Suzuki Rotary bike in the 70's. Funny sounding bike compared to the inline 4 with a header.

Those were INTERNAL rotary engines, meaning instead of pistons, the rotary engine has a rotor, or rotors. This aircraft engine has pistons.

turboguzzi wrote:

nice, even if these motors are called radials, or aero radials, not rotaries

by rotary you usually mean a wankel as Kawickrice said here

they had the advantage of cooling the motor better by the forced flow over the cyls.

They are actually called rotary engines in vintage aircraft circles. A radial engine does not spin on it's crankshaft like a rotary does, the cylinders and block remain fixed and the engine functions much as any internal combustion engine.

TerryK wrote:

turboguzzi wrote:

nice, even if these motors are called radials, or aero radials, not rotaries

by rotary you usually mean a wankel as Kawickrice said here

they had the advantage of cooling the motor better by the forced flow over the cyls.

They are actually called rotary engines in vintage aircraft circles. A radial engine does not spin on it's crankshaft like a rotary does, the cylinders and block remain fixed and the engine functions much as any internal combustion engine.

upload.wikimedia.org/wikipedia/commons/a/ab/Radial_engine.gif [/img]

Never knew the difference in the concepts of the different engines. So this would be a radial chopper not a rotary? I am learning here.

The chopper is a radial the crank turns
The one I posted is a rotary the engine turns,the crank is stationary.
Its crazy but its true
Thats the difference

Can you imagine the gyroscopic effect these engines would have had on an airframe I bet they turned one way really easy and the other way was a bear.

They found out the Japanese Zero's weak spots after recovering a crashed Zero and throughly checking it out:

Koga’s Zero
Courtesy of occasional reader pdxjim, the story of a captured Japanese plane that may have helped to change the outcome of the Pacific War:

“The Zero had superior maneuverability only at the lower speeds used in dogfighting, with short turning radius and excellent aileron control at very low speeds. However, immediately apparent was the fact that the ailerons froze up at speeds above two hundred knots, so that rolling maneuvers at those speeds were slow and required much force on the control stick. It rolled to the left much easier than to the right. Also, its engine cut out under negative acceleration [as when nosing into a dive] due to its float-type carburetor.

“We now had an answer for our pilots who were unable to escape a pursuing Zero. We told them to go into a vertical power dive, using negative acceleration, if possible, to open the range quickly and gain advantageous speed while the Zero’s engine was stopped. At about two hundred knots, we instructed them to roll hard right before the Zero pilot could get his sights lined up.

This recommended tactic was radioed to the fleet after my first flight of Koga’s plane, and soon the welcome answer came back: ‘It works!’”
It was June 1942, seven months into the war, the outcome trembling in the balance. Flight Petty Officer Tadayoshi Koga lost oil pressure after a strafing run during the diversionary attack against Dutch Harbor in Alaska. He attempted to ditch his stricken craft on a divert field, but it flipped over in a bog and he was killed. His wingmen circled overhead, wondering whether they ought to strafe the wreck – and possibly kill their injured friend – or hope that he could free himself for a rescue.

On such small decisions can depend the fates of empires.

sometimes i wish i still could do bong hits...this is one of those times...


TerryK wrote:

turboguzzi wrote:

nice, even if these motors are called radials, or aero radials, not rotaries

by rotary you usually mean a wankel as Kawickrice said here

they had the advantage of cooling the motor better by the forced flow over the cyls.

They are actually called rotary engines in vintage aircraft circles. A radial engine does not spin on it's crankshaft like a rotary does, the cylinders and block remain fixed and the engine functions much as any internal combustion engine.