-Original Message-
From: Vivian Meazza
Sent: 04 May 2004 7:38 pm
To: 'FlightGear developers discussions'
Subject: RE: [Flightgear-devel] Spitfire Propeller vs. YASim
Richard Bytheway wrote
Sent: 04 May 2004 10:42
To: FlightGear developers discussions
Subject: RE
I had already shown by some pretty simple math that at 2850
rmp the tips of
a 1.65m radius propeller would be supersonic and therefore highly
improbable, but we now know that the data of hp, gear ratio,
rpm etc all tie
together.
Thanks
Vivian Meazza
I have a memory from years back
Richard Bytheway wrote:
I have a memory from years back of being told that the reason the Spitfire had such a distinctive sound was that the propellor tips _were_ supersonic. Maybe it was just heresay.
That probably was for the Harvard.
Erik
___
Richard Bytheway wrote:
I have a memory from years back of being told that the reason the
Spitfire had such a distinctive sound was that the propellor tips _were_
supersonic. Maybe it was just heresay.
I don't know about the Spitfire, but I understand that's the case with many
floatplanes -- you
Richard Bytheway said:
I had already shown by some pretty simple math that at 2850
rmp the tips of
a 1.65m radius propeller would be supersonic and therefore highly
improbable, but we now know that the data of hp, gear ratio,
rpm etc all tie
together.
At higher altitudes? IIRC
Richard Bytheway wrote
Sent: 04 May 2004 10:42
To: FlightGear developers discussions
Subject: RE: [Flightgear-devel] Spitfire Propeller vs. YASim
I had already shown by some pretty simple math that at 2850
rmp the tips of
a 1.65m radius propeller would be supersonic and therefore
Wolfram Kuss
Spitfire Mk IIA
Ah - surprising!
Here is an email Rick Fuelcock sent me a short while ago. I
hope it helps. Sorry for the poor formating.
--- snip -
Rather than send you the GBE code , I will direct you to the
site where I got
Spitfire Mk IIA
Ah - surprising!
Here is an email Rick Fuelcock sent me a short while ago. I
hope it helps. Sorry for the poor formating.
--- snip -
Rather than send you the GBE code , I will direct you to the site
where I got
it:
Andy Ross said:
Vivian Meazza wrote:
Here are some calculations on propeller rpm.
[...]
We can see that 2850 is unlikely to be the rpm of a 10.75 diameter
propeller
Yeah, you're right. This is a real bug. I was playing with it this
morning, and we're hitting an edge case in the
Wolfram Kuss asked
I did not see the original thread. What Spitfire version are
you speaking about?
Spitfire Mk IIA
Regards
Vivian
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I did not see the original thread. What Spitfire version are you
speaking about?
Bye bye,
Wolfram.
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Andy Ross
[Starting a new thread. The reply nesting level in my
mozilla window was getting freaky.]
Vivian Meazza wrote:
The engine I'm trying to specify developed 1140 HP at engine
revolutions of 2850 rpm at a boost pressure of 9 psi. It was fitted
with 1:0.477 reduction
Vivian Meazza wrote
Andy Ross
[Starting a new thread. The reply nesting level in my
mozilla window was getting freaky.]
Vivian Meazza wrote:
The engine I'm trying to specify developed 1140 HP at engine
revolutions of 2850 rpm at a boost pressure of 9 psi. It
was fitted
Vivian Meazza wrote:
Here are some calculations on propeller rpm.
[...]
We can see that 2850 is unlikely to be the rpm of a 10.75 diameter
propeller
Yeah, you're right. This is a real bug. I was playing with it this
morning, and we're hitting an edge case in the propeller solver.
The
[Starting a new thread. The reply nesting level in my mozilla window
was getting freaky.]
Vivian Meazza wrote:
The engine I'm trying to specify developed 1140 HP at engine
revolutions of 2850 rpm at a boost pressure of 9 psi. It was fitted
with 1:0.477 reduction gearing, which I think means
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