Aces High Bulletin Board

General Forums => Aircraft and Vehicles => Topic started by: MiloMorai on February 11, 2005, 07:45:20 AM

Title: Utterly fantastic aero engines
Post by: MiloMorai on February 11, 2005, 07:45:20 AM: Rolls-Royce Eagle 22
- by Barry Hares

The main details of the full-size engine are as follows:
Type of engine: Geared, pressure liquid cooled, flat H, sleeve valve engine with two-speed, two-stage liquid cooled supercharger, driving contra-rotating propellers through reduction gearing.
Bore 5.4”
Stroke 5.125”
Swept volume 2,816 cu in (46 litres)
Compression ratio 6.5:1
Supercharger ratios 3.0:1 & 3.67:1
Reduction gear ratio 0.298:1
Maximum power 3,200 HP at 18 psi boost
Carburetor indirect fuel injection

For a 1/5th-size engine, this gave a total capacity of 22.53 cu in (370 cc).

(http://www.enginehistory.org/photogallery/photo1095/rimg00614.jpg)
A larger pic is at the website.

"Inside a 1/5th Scale Rolls-Royce Merlin XX, Completed in the Early 1980s. Took him 6000+ hours of work

(http://www.enginehistory.org/ModelEngines/Hares/Merlin%20XX/2m.JPG)

Take the time and look at the craftmanship,

http://www.enginehistory.org/merlin_xx.htm

The short jpg of the Merlin running is a must view.
Title: Utterly fantastic aero engines
Post by: mars01 on February 11, 2005, 09:58:50 AM: That is a beautiful work of art.

Great write up of what happend in 1 second in the merlin too.

Very cool. Thanks Milo.
Title: Utterly fantastic aero engines
Post by: Bodhi on February 11, 2005, 10:10:38 AM: WOW :eek:

Amazing work.
Title: Utterly fantastic aero engines
Post by: Charge on February 11, 2005, 12:39:29 PM: Great looking piece of craftsmanship!

BTW

"flat H, sleeve valve engine"

The model engine is a V with normal valves. Napier Sabre was an H and had sleeve valves.

-C+
Title: Utterly fantastic aero engines
Post by: MiloMorai on February 11, 2005, 04:47:47 PM: charge, look at the pics here, http://www.enginehistory.org/eagle_22.htm

The RR Eagle was also a sleeve valve H-24.

The site is a wealth of info, such as this 1940 Japanese 24 cylinder X engine, YE3.

(http://www.enginehistory.org/Japanese/YE3-1.jpg)
Title: Utterly fantastic aero engines
Post by: Charge on February 11, 2005, 08:57:43 PM: Eh, sry Milo I didn' notice that. I stand corrected.

That picture of assembled cylinder bank of an H engine looks great! Good details of an exotic valve/cylinder combination.

:)

-C+
Title: Utterly fantastic aero engines
Post by: Angus on February 13, 2005, 05:33:40 AM: Duhhh, it's RR.
Why hasn't anybody posted a pic of the DB :D :D
Title: Utterly fantastic aero engines
Post by: Charge on February 13, 2005, 07:28:35 AM: Nobody makes those small DBs?

Or what do you think Angus?

-C+
Title: Utterly fantastic aero engines
Post by: Angus on February 13, 2005, 10:15:18 AM: I think, why not :D
Title: Utterly fantastic aero engines
Post by: Charge on February 14, 2005, 05:23:03 AM: Maybe because it is a matter of perfection? Resemblance is not good enough, it has to be exactly like the original?

Some ideas why there is no DB: The DB was a solid block engine ie. The cylinder pipes and the cylinder block was not removable from the crankcase. Thus it is harder to manufacture with CNC machinery as the whole block should be cast, and then machined.

The supercharger was not mechanical as in RR but hydraulic and that could be problematic to manufacture. (It could be made mechanical of course...)

The RR-type is still quite common engine and thus its structure is well known and documented whereas the DB is hard to find, at least in dismantled condition, for inspection.

Does anybody have any dismantled pictures of a DB? It would be interesting to see how it was different to RR.

Cheers,

-C+
Title: Utterly fantastic aero engines
Post by: MiloMorai on February 14, 2005, 06:00:02 AM: A BMW 801 should be possible though.

Charge you can get engine drawings (iso) from here, http://aviationshoppe.com/catalog/default.php?cPath=21

DB601
(http://aviationshoppe.com/catalog/images/Daimler-Benz-DB-601.jpg)
Title: Utterly fantastic aero engines
Post by: Angus on February 14, 2005, 05:54:21 PM: Re-manufacturing a DB, staying with the princip should not be that hard in 2005?

Or was it more quirky than you'd think?
Title: Utterly fantastic aero engines
Post by: Charge on February 14, 2005, 07:01:31 PM: "Or was it more quirky than you'd think?"

You care to explain Angus, I really can't stay with you on this one..?

Quirky?

-C+
Title: Utterly fantastic aero engines
Post by: GRUNHERZ on February 14, 2005, 08:53:09 PM: Quote
Originally posted by Angus
Re-manufacturing a DB, staying with the princip should not be that hard in 2005?

Or was it more quirky than you'd think?

Rolls Royce told the Bf109G2 "Black 6" restoration team to not break the original DB605 crankshaft because they could not make a replacement...

:)
Title: Utterly fantastic aero engines
Post by: MiloMorai on February 14, 2005, 09:14:46 PM: Oops

(http://frhewww.physik.uni-freiburg.de/~jaensch/104/r/r007.jpg)
Title: Utterly fantastic aero engines
Post by: Bodhi on February 14, 2005, 10:09:13 PM: Quote
Originally posted by GRUNHERZ
Rolls Royce told the Bf109G2 "Black 6" restoration team to not break the original DB605 crankshaft because they could not make a replacement...

:)

Rolls Royce will not make it because of liability issues.

It is the same with propellors, if we want new Curtiss Electric blades made for the p38 or p40 we will have to go to an independent maunfacturer, as no major corporation will touch it owing to liability issues.

As for crank shafts, why do you suppose Rolls Royce is not making new crank shafts for Merlins? There are a hell of a lot of them out there. It's all liability.

Sorry folks, but liability will ground the warbirds and most likely affordable private aviation.
Title: Utterly fantastic aero engines
Post by: Glasses on February 15, 2005, 06:36:12 PM: Don't they have Pro E to make a new one :D
Title: Utterly fantastic aero engines
Post by: hawker238 on February 15, 2005, 06:58:31 PM: Bodhi, is it possible to produce without liability? Like having a contract with a waiver, the whole thing written in stone?