Which country designed the best engines for WWII?

[Glider]

Originally Posted by Denniss

Document says the aircraft/engine is fitted with the same prop as was used on the Spit VI with Merlin 47. It does not say the data is from a Spit VI or Merlin 47.

I did say that I wasn't any good at German, thanks for the correction.

[Kurfürst]

Originally Posted by Juha

BTW
A. C. Lovesey gave as the weight of 2-stage Merlin 1660 lb in his lecture to the De Havilland Aircraft Company Technical Department in Nov 1945.
Source Aircraft Engineering July 1946.

Juha

I wonder Juha how many times you want to repeat a figure you don`t actually what it actually stands for to serve as distraction. I believe the matter has been decided. I see no point to discuss it any further.

[Juha]

Lovesey, who happened to have been one of the engine specialists of R-R, gave the figure in connection when comparing the size and weight of 2-stage Merlin to a hypothetical single stage engine giving same power at 30 000ft. There isn’t much sense to make the comparison without including the superchargers of the both engines and the intercooler of the 2-stage engine. More so because in the profiles of the engines in the comparison the superchargers and the intercooler are clearly attached into engines.

And because I don’t thing it very probable that official P-51 B/C empty, basic and gross weights were weights without superchargers and intercooler, You at least seemed to retract from the claim that they were weights also without the carb, as your oppinion imply, I don’t think the question is settled. We simply disagree.

[Kurfürst]

Lovesley didn`t write anything like that. In any case, you are using his name to give authority to your claims, without Lovesey actually supporting your opinion.

Actual measurements of the Merlin 61 show beyond reasonable doubt that the weight of the engine complete with supercharger and intercooler was 834 kg.

That some here are unreasonable is not my concern.

[Juha]

Kurfürst
if You have the article reread it and especially check the Fig. 10 and compare it with Fgures 13 and 14

Juha

[slaterat]

Well Kurfurst here's some more links for you. Straight from the
WW2aircraft.net forums.

http://www.ww2aircraft.net/forum/showthread.php?t=12036

The first one is a link to the manual for a two stage merlin. In it on chapter one page 3 , it describes the 60 series as having a two speed, two stage supercharger. farther down , you will read the dry weight for a merlin 61 is 1,640lbs. Of course you know this as you have already downloaded the said manual.

http://www.ww2aircraft.net/forum/showthread.php?t=10777

The second link is an article on the merlin XX. Here it states the dry weight for a merlin XX as 1450 lbs, also remarking that the merlin XX is only 75 lbs heavier than a merlin II[ the same block with a single speed supercharger] and has a power to weight ratio of 1.13 lbs /hp. thats 1280 [the power] divided into 1450 lbs[the dry weight of the engine, including the supercharger and carb].

All merlins used the same bore and stroke and 27 liter displacement. The differences in weight are due to the different superchargers/fuel delivery systems that are installed.

Kurfurst ,you said I was making up numbers and called me a liar when you knew I was posting legitimate numbers, what does that make you ?

You have provided nothing, except a scrap of paper that doesn't mention a merlin 61 anywhere. Obviously this document is in error or just a piece of German propaganda embellished to impress the superiors. In either case I'll take the numbers from the manual used by the people who built and serviced these fine engines.

You can't seriuosly tell me that you think the Germans could build a 35 litre engine complete with supercharger , lighter than the British could build a 27 litre engine excluding the supercharger? Let me guess you say yes.

Kurfurst I am forced to conclude that you are nothing more than an agent of propaganda. Why dont you do us all a favor and go and peddle your goods somewhere else, no one here is buying.

slaterat

[Kurfürst]

Mouth mouth mouth.

'Complete Engine (including supercharger and intercooler), but without coolant : 834 kg (1837 lbs)
Engine dry weight 740 kg. (1629 lbs)'

And since when drilling bigger holes in a piece of metal makes it heavier..?
In any case, the French could appearantly make a 36 liter engine at 470 kg.
Hispano-Suiza 12Y - Wikipedia, the free encyclopedia

In any case, none of your claims has factual basis, but we have accustomed to that on other boards already.

[evangilder]

Everyone here needs to stop with the snide comments and focus on the facts. If the personal insults continue, we will close this thread.

[Glider]

This is one of those situations that will probably not be solved.
On one side you have all the various sources mentioned both on line and published including the original manuals on the engine all giving the same basic weight of round 1,650lb.

On the other Kurfurst has his one source which to be fair a) does gointo detail but b) doesn't actually say that it comes from a Spit IX or a Merlin 61 series engine, only that it had the same propeller as the merlin 47 on a Spit VI

This last point could be quite important as the Spit XII with the early Griffon also had a 4 bladed Rotol prop and the weight of the early Griffon was 1800lb which is very similar to the weights on the document that Kurfurst has shown us.

I would suggest that there is a possibility that the Germans are looking at the engine from a Spit XII not a IX

[Kurfürst]

Originally Posted by Glider

but b) doesn't actually say that it comes from a Spit IX or a Merlin 61 series engine

Hmm...

[Glider]

And how do you explain the manuals on the engine?

[slaterat]

Well I did some research and found a good comparison.

A Rolls Royce meteor, sometimes called a rover meteor, was a version of the merlin made for use in tanks. Once again it had the same bore/stroke displacement and aluminum block. The two biggest differences are that the meteor was not certified for air use and it was not equiped with a supercharger. It also used more steel componants as weight saving wasn't as essential in a tank compared to an aircraft.

Well the weight of a meteor is about 1,100 lbs. That would be the weight for a merlin block plus a carb with no supercharger.

Slaterat

[Kurfürst]

Originally Posted by Glider

And how do you explain the manuals on the engine?

Explain what?

The manuals says the engine`s dry weight is 740 kg or so.
The German report says the engine`s dry weight is 740 kg or so.
The German report says the engine`s complete with supercharger and intercooler is 830 kg or so.

Clearly the weight of the supercharger and intercooler is not included in the 740 kg figure, which is the bare engine.

Dance around that fact as long as you like.

Thats the difference you see - you see a figure of 740 kg in a source and claim it includes this and that - but your source does not say that it includes this and that, its a thing you add yourself to the story.

[Juha]

Slaterat
good point that RR Meteor info!

Juha

[Glider]

Originally Posted by Kurfürst

Explain what?

The manuals says the engine`s dry weight is 740 kg or so.
The German report says the engine`s dry weight is 740 kg or so.
The German report says the engine`s complete with supercharger and intercooler is 830 kg or so.

Clearly the weight of the supercharger and intercooler is not included in the 740 kg figure, which is the bare engine.

Dance around that fact as long as you like.

Thats the difference you see - you see a figure of 740 kg in a source and claim it includes this and that - but your source does not say that it includes this and that, its a thing you add yourself to the story.

The interesting thing is that I supplied a number of sources not a source and other people supplied other sources. All of them in agreement. The only exception is yours which is why I said earlier that this is one that is not going to end in agreement.

Look at it the other way, what would be your reaction if there is a report about something German and it went in the face of every piece of evidence you found in Germany. I am sure you would say no problem Glider, I agree that all the German sources, manufacturers data and independent papers published or on the web are wrong and what you have is correct.