NASA/Army/Garrett turbocompounded V-6 diesel

[GeorgeA]

http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930001160_1993001160.pdf

1000 HP, 133 cu. in., 393 psi BMEP. Not bad.

Nice discussion of the Napier Nomad herein as well.

GeorgeA

 

[J.A.W.]

I note that NASA report comments on their being very impressed by the Nomad,
& how the relatively low fuel costs 60 years ago cruelled its chances.

Never-the-less, if in (a potential) future, & 'green' concerns over the effects of stratospheric turbine use,
come to the crunch, it is possible that we may yet see a Nomad-type (diesel-punk?) comeback..

 

[VTOLicious]

Austro Engine (Diamond Aircraft) is currently developing a V8 diesel to replace the turboshaft of an EC-120. Not a compound cycle engine (as far as I know), but the aim is the same: "low fuel consumption, high power density"

http://www.secretprojects.co.uk/forum/index.php/topic,20851.msg210817.html#msg210817

BR Michael

 

[LowObservable]

The potentially big deal here is the inherent flat rating. Heckuva good UAV motor too.


On the Army helicopter engine: note early in the report that it talks about the logistics of fuel supply. When military people think about engine efficiency they often forget that fuel at the FOB or out of the back end of a KC-135 costs more than it does on contract at O'Hare.

 

[tartle]

Our ex-PM Tony Blair has backed a 'green' opposed piston engine; so has Bill Gates

 

[LowObservable]

The OPOC rides again...


http://www.aviationweek.com/blogs.aspx?plckblogid=blog:27ec4a53-dcc8-42d0-bd3a-01329aef79a7&plckpostid=blog:27ec4a53-dcc8-42d0-bd3a-01329aef79a7post:378cdd1b-858e-43d7-af0e-82c2f60f1a29

http://www.aviationweek.com/Blogs.aspx?plckBlogId=Blog:27ec4a53-dcc8-42d0-bd3a-01329aef79a7&plckPostId=Blog:27ec4a53-dcc8-42d0-bd3a-01329aef79a7Post:e919cfe1-dccd-4a5f-bd47-4824edd08a3b

 

[J.A.W.]

OPOC certainly has some big name support.

This bloke appears to have reason in his claims to a superior design though..

http://www.pattakon.com/pattakonPatOP.htm

 

[Avimimus]

It will be interesting to see weight estimates for these engines.

 

[J.A.W.]

Some of the engines cited do include weight & power-to-weight ratio info, A..

 

[Nicknick]

can anyone please provide the NASA Report, the link doesn t work anymore I would really like to know what they did....

 

[Apophenia]

can anyone please provide the NASA Report, the link doesn t work anymore I would really like to know what they did....

Wayback Machine

 

[Nicknick]

thank you a lot!

Great find, with a lot of information about the Napier Nomad too, very intresting!

Despite that, I believe 1000 HP @6000 rpm was a bit to ambitous for a helicopter Diesel engine...

 

[riggerrob]

thank you a lot!

Great find, with a lot of information about the Napier Nomad too, very intresting!

Despite that, I believe 1000 HP @6000 rpm was a bit to ambitous for a helicopter Diesel engine...

They also need to add a "soft" torque converter to reduce torsional vibration.

 

[Nicknick]

So higher the rpm, so lower the torque fluctuations, this would not be a major problem.

 

[publiusr]

I want the turbocompound to make a comeback.

 

[Nicknick]

the tecnology is not forgotten:

Turbo-compound engines explained

A flow of hot gas contains residual energy and turbo-compounding uses that gas flow to drive a second turbocharger that, in turn, drives a gear-train connected to the output end of the crankshaft.

www.trucksales.com.au