The Ongoing Mystery Aircraft Thread Part Deux.

[wout]

Some hints on the heli. It was built in 1948/1949. According Aerofiles
Igor Sikorsky made at least one flight in it. For travel he could stay on the East Coast and the manufacturer name is still around in aviation and is well-known for major turning parts for aircraft (though I am pretty sure it is not the same company that built this heli.)
Final clue. It was called Model 1 by the manufacturer, so that must be a big help.

[Moses03]

With all the hints ands clues I uncovered your Hamilton Helicopter.

Pressing on with an unusual pusher biplane...

[wout]

Moses03, Bingo. Maybe I gave too many hints.

[Moses03]

I think we needed those hints!

Here is a rear view of the mystery bipe-

[wout]

Moses03, not my territory, but (a long shot) Callaudet?
I know Enzo Callaudet did build a somewhat similar pusher a/c in 1915, albeit this was not a biplane.

[Moses03]

Not familiar with Callaudet. I know of a Gallaudet? Not either though.

This one hails from a cold Eastern country...

[lefty]

'Tis a Kasyanenko 5.

[Moses03]

That would be it. Over to the highlands-

[lefty]

Thanks, Kevin - actually Fife still counts as the Lowlands !

Your hint helped a lot - the A-frame building in one pic had me convinced it was one of yours, and Aerofiles took a hammering......

Anyway, here's a quirky quad for you.

[Moses03]

Savelyev-Zalewski S.Z. Quadruplane No. 1.

[lefty]

You got it - although this is actually #3.

[Moses03]

Thanks. I had conflicting info on that one so I went with the #1.

How about this curious number?

[lefty]

Looks very homebuilt, this one........

[Moses03]

Not homebuilt. This was a post-war concept that didn't pan out.

[wout]

The Aernova AER-1 ""roadable"" of Luigi Pellarini?