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Re: old picture

Posted: Fri Jan 07, 2011 1:48 pm
by vanzen
robtg wrote:
Streamlining, similar to the fairings on the fork legs in the first photo.
I would have assumed the space to be hollow and flow gasses ... but who knows ?
Interesting scenario in either case (flow or aerodynamics),
but unless the pipe is at hand to scrutinize ...

Re: old picture

Posted: Fri Jan 07, 2011 3:48 pm
by robtg
vanzen@rockerboxer.com wrote:
robtg wrote:
Streamlining, similar to the fairings on the fork legs in the first photo.
I would have assumed the space to be hollow and flow gasses ... but who knows ?
Interesting scenario in either case (flow or aerodynamics),
but unless the pipe is at hand to scrutinize ...
Another thought--- Blowdown during overlap on a supergharged motor eliminates the need for exhaust scavenging
of the cylinders. Most blown motors just dump the exhaust overboard with short pipes, Auto Union comes to mind. Even with the pipe at hand to scrutinize , it may not be obvious---German engineering being a little
odd in that era. :)

Re: old picture

Posted: Sun Jan 09, 2011 2:14 pm
by melville
Who is the old(er) man in the first pic? Could it be Ernst Henne himself? If so, the bike is a good 30+ years old by then and all sortsa stuff could have changed from the period record pics. Perhaps the bike had undergone a "restoration" with parts that were readily at hand (megaphones). Perhaps the bike was part of other ongoing R&D and the megas were a later change.

Re: old picture

Posted: Sun Jan 09, 2011 10:28 pm
by Deleted User 62
melville wrote:Who is the old(er) man in the first pic? Could it be Ernst Henne himself? If so, the bike is a good 30+ years old by then and all sortsa stuff could have changed from the period record pics. Perhaps the bike had undergone a "restoration" with parts that were readily at hand (megaphones). Perhaps the bike was part of other ongoing R&D and the megas were a later change.
You're right, it is ol' Ernst himself. The bike with the modifications shown: Image and Ernst himself: Image Image Also, I'd be willing to bet the added metal on the header was for streamlining. I read a book called "Shape and Flow" many years ago. A circular cross section has way more drag than the teardrop shape, something on the order of 16:1, so a 1/16" wire will have the same drag as a 1" thick symmetrical airfoil.

Re: old picture

Posted: Tue Jan 11, 2011 1:14 am
by Chuey
Airfoil sounds right to me. Next........the spokes!

Chuey

Re: old picture

Posted: Wed Jan 12, 2011 6:41 pm
by Flatwins
Wicked googly! Thought that might be Henne.

Re: old picture

Posted: Wed Jan 12, 2011 10:47 pm
by Deleted User 62
Flatwins wrote:Wicked googly! Thought that might be Henne.
Yep, just do a search of Ernst Henne in Google images, lots of cool photos pop up!