Thought we could do with one for Chinooks, but might as well expand it to Sea Knights, Belvederes, Yak-24s etc..., so here you go, a place for all your twin egg-whisk ideas. :)
What prompted me were a couple of things that led to a couple more things:
1. Has there ever been a proposal for a skinny-fuselage flying crane version of the Chook, a la CH-54 Tarhe? if not, then this is something whiffdom could recify.....
EDIT: yes there was - see here:
http://www.secretprojects.co.uk/forum/index.php/topic,565.15.html2. Whilst looking up point 1, I found this, which looks very doable:
from here: http://aviationtrivia.blogspot.co.uk/2009/11/first-flying-on-27-may-1970-boeing.html
First flying on 27 May 1970, the Boeing Vertol 347 testbed was a modified CH-47A Chinook (aircraft 65-07992) used for Boeing's HLH (Heavy Lift Helicopter) program. The helicopter featured just over 9 foot extension of the forward fuselage cabin, a raised aft rotor pylon, four bladed rotors that were two feet longer than a standard Chinook blade, fly-by-wire controls and retractable landing gear.
But the most unique feature of the Model 347 was a variable-incidence wing that created extra lift to offload the main rotors. There was also a retractable gondola in the forward fuselage that had a full set of flying controls during flying crane operations. As the twin rotors no longer overlapped, some degree of noise reduction was also achieved. The Model 347's performance was greater than that of the standard Chinook, but flight testing ended in 1975 with the cancellation of the HLH program.
Excellent page about it here:
http://www.chinook-helicopter.com/history/aircraft/A_Models/65-07992/65-07992.html3. I also found this:
4. And, of course, this:
from here:
http://www.diseno-art.com/news_content/2012/11/boeing-vertol-xch-62/
