>>>>>Promo pic for McLaren P1 (see attached)
>>>>>
>>>>>The aircraft in the background has at least 4 turbofan engines, in twin-pod configuration. That configuration is not commonly used. There are some examples such as B-36 and B-47 but those use twin turbojet, not turbofan, engines.
>>>>>
>>>>>I'm 99% sure it's not a B-52H, you can Google images for those engines, the inlet looks significantly different.
>>>>>
>>>>>It's defeated my Google-fu so far ...
>>>>
>>>>I don't see why you think its not a B52. Maybe the photoshopped it a bit to bring the fans forward.
>>>
>>>There's another McLaren image taken from a slightly different angle. They might both be Photoshop jobs, but why bother if you can just use an actual aircraft of some kind?
>>>
>>>Also a B-52H T33 engine dual pylon looks significantly different, and the nacelles as well (look at the joint between them). Images attached.
>>>
>>>Walter: the B-52 TF33 engines have 28 visible blades in the turbines, the engines in the McLaren pics have 32 blades.
>>
>>I'm not an expert, but are you sure they have 28 blades? I ask that because in the pictures, you are not directly looking at the blades, but rather at some kind of roster placed directly in front of the blades. See http://upload.wikimedia.org/wikipedia/commons/5/56/Pratt_%26_Whitney_J58_Turbojet.jpg
>>
>>You can see more clearly from http://www.enginehistory.org/G&jJBrossett/English%20Field/P&w%20tf33.jpg, which has 34 blades.
>>
>>That roster seems to be missing from the mclaren picture, perhaps from an estetic motivation.
>>
>>Still I think the aircraft is a B52. How many aircrafts are out there with twin pair engines with a fuel tank at the end of the wing?
>
>Not a lot - that's why this is perplexing :)
>
>Not sure what you mean by "roster", maybe "rotor"? Actually it seems some turbofans have fixed inlet guide vanes, which is what I counted on the TF33, rather than the fan blades themselves.
>
>If you look at the first attached image, the B-52H engine size is not that large, only 1.31m diameter to the tips of the fan blades. The engines in the McLaren pics look larger. Also in the McLaren pics the pylon has a ridge down the leading edge, I've not seen that in any pics of B-52 engines.
>
>So your guess is a B-52H with some sort of dual inlet guide vane removed from the twin pod? Possible, but if I were designing nacelles, for weight and ease of maintenance I wouldn't do it that way.

Actually, I think I go for viv's suggestion that the interior of the engine has been Photoshopped. It looks too perfect and clean.

Walter,