Spot the mistake…

Agreed and someofthem are native English speakers. Doesn’t say a lot for our education system does it?

Creaking Door said:

Was the Merlin-engined P-51 fitted with a two-stage supercharger from the outset then?

Yes. Both Rolls Royce and North American Aviation initiated projects to convert P-51A’s from the Allison V1710 to the Merlin 66, as a proof of concept IIRC. The Rolls Royce aircraft flew first. A good book to read on this subject is the Rolls Royce Heritage Trust publication “Rolls Royce and the Mustang”. 🙂

For lst in WWII there were NOT with a Rolls Royce engine & they lacked altitude, to speed. Once the British RR was put in that was the answer.

Probably Packard or some other firm like Allison (I think it was Allison at the start) in the USA built the engine to RR standards. At first they could not even get them to turn over so the Brit engineers came over by boat to notice so many threads were AMERICAN Standard, when the RR not only required British threads, to also some special threads required for a proper RR which allowed higher revs.

Our head m/c mechanic flew the outdated & usless British Fighter Bomber, which I think was called a Beaufort, & then switched to Mosquito that allowed him to carry heavier bomb load to ammo but only so many revs.

That was with an American RR rebuild, then a used British RR that allowed more of both, to finally a true British RR & so max in bombing to rockets, to revs & such. :

Rowley Birkin?

Was the Merlin-engined P-51 fitted with a two-stage supercharger from the outset then?

C-D, the Alison V1710 did have a supercharger…

Oops! Back to the drawing-board! 😮

If I’d thought about it I’d have realised what a ridiculous statement I was making; no aero-engine of the size and power of the Allison V-1710 would be produced without a supercharger. I had in mind that the Allison-engined P-38 (and P-51?) ordered by the British were ordered without turbosuperchargers! Doh! :rolleyes:

Myths again….

C-D, the Alison V1710 did have a supercharger…try Wiki….

Ah yes, the other great myth perpetuated….
The Allison was originally designed to US military specification to be used in conjunction with a turbocharger, as there had been a lot of time and money expended on the development of turbo’s in the US. Yes, the Allison, up to and including the “F” series were built with a single stage, single speed supercharger, which by itself, limited altitude performance. The “G” series Allisons had a two stage, variable speed supercharger that solve the altitude performance problems, but was too late to be placed into mass production instead of the Packard Merlin. The Mustang had already been redesigned for the Merlin and as the “G” series Allison was a few inches longer, the Mustang would’ve required further redesign to accomodate this. Production was already underway and I believe the authorities decided to press on with the Merlin option. Author Dan Whitney has speculated what performance improvements could’ve been made if the “G” series Allison Mustang had ever been produced. The main benefit probably would’ve been better fuel consumption, leading to superior range. Dan’s book “Vee’s For Victory!” is a great read for those interested in this subject.
Remember, of course the F-82 Twin Mustang was produced post war with this very engine.

Western Canada.

Hate to break the news to everyone but here in Western Canada there is no issue with the language…we don’t even say eh.

Tom

C-D, the Alison V1710 did have a supercharger…try Wiki….

Western Canada.

Isn’t that the dialect where every other syllable is “ooot”? :diablo:

:eek::eek:

No, I mean “ah” as in “I see – I was wrong in my original assumption!”:(

oh. 😀

I’m still trying to work out how you apparently lock up a Merlin by *mistakenly* building it with standard US fasteners instead of Whit.

It sounds like the usual mix of half-truths, misconception and myths about US-built Merlin engines!

I have heard that US built Merlin engines always produced more power than British built engines and this was because either they were better made (not ‘hand-built’) or that the metal they were made from was better quality. I’ve also heard that the US had to show the British how to mass-produce Merlin engines also because the British engines were ‘hand-built’. As far as I know there isn’t any truth in any of this…

…however much some may wish there to be! :diablo:

The initial paragraph (if I’ve understood correctly), about the P-51, is pretty-much correct; the P-51 with the original Allison V-1710 engine did lack high-altitude performance, nothing wrong with the engine…..but it had no supercharger! :rolleyes:

No, I mean “ah” as in “I see – I was wrong in my original assumption!”:(

Ah!….

I think you mean “eh” 😉

I’m still trying to work out how you apparently lock up a Merlin by *mistakenly* building it with standard US fasteners instead of Whit.

Western Canada.

Ah!….

The information is all there, But I think maybe he meant Blenhiem. But don’t knock the language. My wife is from Belarus and can communicate in 4 different languages and speaks Russian and English fluently.
She teaches English as a foriegn language to students, and I have to say I admire people who can speak other languages especially as many english speakers(including me) barely manage their own correctly.

I am sure he/she is not a native speaker.

Western Canada.

No apologies necessary; just idle speculation on my part. 🙂

Yes, he did, didn’t he? Apologies..:)

He wrote he ‘thinks’ it was called Beaufort; he also wrote it was a fighter bomber.

While Beaufort was a (torpedo) bomber it was never a fighter.