Is this Rolls Royce…..

I guess it’s true, alcohol and keyboards don’t mix. 😀

Could someone please interpret the two words, ‘ everyone’ and ‘crap’. Perhaps ‘powerandpassion’ first would be polite.

Gosh you RR folk! Everybody knows that the Merlin was just an upside down DB600! Never really worked properly until it flew downunder!

Ok so I am wrong on everyuthinhg.

…maybe a Bristol part, they made fine engines…

Hardly refined enough for a Bristol engine…

…it has to be Rolls-Royce…..or maybe it is off a steamroller? :dev2:

Could someone please interpret the two words, ‘ everyone’ and ‘crap’. Perhaps ‘powerandpassion’ first would be polite.

It cannot be a Kestrel or Merlin reduction gear by virtue of its lightweight construction, ie lack of body in centre to take 100% of engine torque.

4. Everybody knows Rolls Royce made crap engines, look at Trent for example, maybe a Bristol part, they made fine engines, generally better lightweighting, more HP per lb of engine weight, however too much metal in the example so back to RR.

The second statement would appear to be at odds with the first……

[ATTACH=CONFIG]217047[/ATTACH]Yes, definitely early Merlin, as has been suggested.

Here’s a later one (as referred to in Merlin Pete’s post) from a Mk.35. Just the same but with 51 teeth and 20 attachment holes/bolts all of the same size.

Anon.

Yes, Hurricane I had that ratio, the MkII had a 0.42 gear.
Could also be Spitfire, Battle, Defiant, Fulmar, Barracuda, possibly others I can’t think of. Unlikely to be multi engined.

Pete

Is it 44teeth? I can’t see very well on the photo.
If it is then it looks like a Merlin 0.477 reduction gear. It is an early type, up to 1941 because the alternate holes are smaller, later ones used twice the number of attachment bolts, so all the holes were the same size.

Pete

It is 44 teeth.

Could this be Hurricane?

Mark

I have something similar – Remote sited reduction gear from a P-39 Airacobra – afraid it is damaged and not easily accessible at the moment, but will try to get a photo.

Is it 44teeth? I can’t see very well on the photo.
If it is then it looks like a Merlin 0.477 reduction gear. It is an early type, up to 1941 because the alternate holes are smaller, later ones used twice the number of attachment bolts, so all the holes were the same size.

Pete

Few guesses

Merlin or Griffon?

Can any of the engine specialists identify 100% this reduction gear by the number of teeth, fixing attachment holes etc.

Indeed is it Rolls Royce?

Mark

Not a specialist but :

1. Rolls Royce Eagle/Falcon planetary reduction gear by visual and the fact it is the last thing you might think of and this is an aviation forum and you are a RR mensch.
2. It cannot be a Kestrel or Merlin reduction gear by virtue of its lightweight construction, ie lack of body in centre to take 100% of engine torque.
3. May be supercharger reduction gear by virtue of its lightweight construction, cannot be Kestrel as sc reduction gears have elliptical holes, maybe part of Merlin hand turning gear don’t have images of Merlin sc reduction gears as no engine made post 1940 is interesting.
4. Everybody knows Rolls Royce made crap engines, look at Trent for example, maybe a Bristol part, they made fine engines, generally better lightweighting, more HP per lb of engine weight, however too much metal in the example so back to RR.
5. No part numbers, so opening it up, not a French reduction gear, Citroen >> made the helical gear which was less noisy, more contact, sexier design, back to RR. Assuming it is not teutonic, gallic, nipponese, Australian :
6. Logic of the design is outer circumference hard steel, inner shaft maybe not hard steel. Light weight but plenty of tooth linear face to face contact to take big forces and pass them on. Lots of attachment holes to cope with lots of torque. Lots of thought in it. Struggling with unreliable/costly metallurgy. The only guy who really cared to the point of obsession was Henry Royce, so :
7. RR Eagle planetary reduction gear. Got the rest of the motor?