Radial Bi Rotary Balanced Piston Combustion Engine

[frankydevaere]

Radial Bi Rotary Balanced Piston Combustion Engine

http://www.wix.com/devaere/radial-bi-rotary

http://www.youtube.com/watch?v=1ZqCdNU8MlA

 

[patprimmer]

No valve train looks nice.

I am not sure how they hope to maintain the function of a head gasket between moving surfaces especially when the diameter of the head and the length of the cylinders changes due to running at different temperature.

Lubricating the bearings on the limks between the pistons also seems problematic.

Regards
Pat
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[yoshimitsuspeed]

I was wondering about that seal as well. Would they have the whole surface a tight tolerance or maybe use soemthing like the Apex seal in rotaries?
I also wonder how all the rotating mass and extra gearing and moving parts would effect acceleration, efficiency and longevity. I guess though by removing the valve train, power loss from valve springs and things like that it may hold it's own.

 

[patprimmer]

The combustion chamber also has an exceptionally large surface area which would severely reduce thermal efficiency.

Regards
Pat
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[frankydevaere]

those seals or rings , not plates ( apex-seals ) as in a Wankel
if you look carefully, you see 12 ignitions per rotor revolution. A wankel has 3 ignitions. This rotor is therefore rotating 4 times slower slower and the seal-rings do not cause "devils marks " as in a wankel-rotorhouse. They are lubricated without oilconsumption. Nevertheless , this sealing is the most important issue of the engine.

This kind of sealing is not new :
old Mawen Engine :

http://www.enginehistory.org/TM/htm/tmv6n1.htm

recent Jerry Hale :

http://www.youtube.com/watch?v=LgqGvQ1kj0o

The alu-rotor and cylinders are the flywheel, bearing houses are made of torlon ( high temp. resistant plastic ).

Shape of combustion chamber is far better than a wankel.

And above all : it's a compact centrifugal and inertion force balanced drive mechanism.

I still have to translate the dutch white pages on the website.

 

[LionelHutz]

What happened to the solve-all-problems TROPE engine???

 

[BrianPetersen]

Some folks have vivid imaginations, and there's nothing wrong with that. This one will have sealing problems, and efficiency is likely to be poor due to high surface-to-volume ratio, but keep trying.

 

[frankydevaere]

Do you mean mine or Jerry Hale's ?

This one has 12 ignitions per rotorrevolution ,Wankel has 3, Hale has 1.

 

[frankydevaere]

Hale has 4 :

http://www.youtube.com/watch?v=6JaJ6T0T1sk

 

[gruntguru]

"This one will have sealing problems, and efficiency is likely to be poor due to high surface-to-volume ratio, but keep trying."

If the mating surface of the inner to outer rotors was sperical rather than cylindrical, the sealing could be performed by a "piston ring" at the top of each cylinder.

I am not seeing the problem of high surface area to volume ratio. For an engine of this B/S ratio the chamber shape is near optimal. Certainly better than any poppet valve engine. Of course a lower B/S ratio would reduce A/V even further and there do appear to be B/S limitations inherent to the mechanism (and reduced packaging efficiency at lower B/S ratios)

Engineering is the art of creating things you need, from things you can get.

 

[frankydevaere]

hmm...

the Russians, what a similarity

http://www.skyline.ua/DD-3_eng.html