P-51 Cruise Speed = 395 mph TAS

[Anonymous]

Actually, there is some reasonable evidence that the P-51 was actually faster than normally quoted. The P-51B's official top speed is 440 mph, but there were NACA tests giving 453 mph level speed performance. The conditions of the test often had a lot to do with the results.

=S=

Lunatic

 

[RDB]

Hey everybody..i urgently need help..i'm studying aeronautical engineering and need some help with a project regarding aircraft cooling systems..I just wanted to know the various positions in which radiators can be placed, examples of aircrafts with a particular radiator placement and advantages and disadvantages of each type of radiator placement...please help..

Thanks..

 

[FLYBOYJ]

Hey everybody..i urgently need help..i'm studying aeronautical engineering and need some help with a project regarding aircraft cooling systems..I just wanted to know the various positions in which radiators can be placed, examples of aircrafts with a particular radiator placement and advantages and disadvantages of each type of radiator placement...please help..

Thanks..

Hi RDB;

I would first recommend starting a new thread on this rather then resurrecting an old thread that really isn't relevant to what you're looking for. But to begin to answer your question, what type of aircraft are we talking about, single engine or multi engine aircraft.

 

[Snautzer01]

for a start ut i suggest you open another thread.

 

[mhuxt]

I've always thought the difference between the cooling systems of the dH Mosquito vs the Westland Whirlwind would make an interesting discussion - advantage to the Mossie of course, old boy.

Couple 3-views should give you a start.

 

[RDB]

Sorry guys, i didn't really know how to start a new thread since i'm new to this..

i was looking at mainly unlimited racing aircrafts..eg Dago Red, September Fury etc..

Thanks Snautzer01 that helped..

 

[red admiral]

Aerodynamics of Propulsion by Küchemann and Weber has lots of details if you can lay your hands on a copy. It covers all the points you've raised.

 

[RDB]

thanks guys..that certainly helped..by any chance does anybody know any books i can refer to for aircraft coolants?

sorry again i don't wanna be rude by interrupting the forum, i just really don't know how to start a new one, i'll delete my comments as soon as possible..

 

[FLYBOYJ]

thanks guys..that certainly helped..by any chance does anybody know any books i can refer to for aircraft coolants?

There isn't a whole lot out there because only a hand full of aircraft these days have cooling systems. Try the rotax website as I think they are one of the only production aircraft engines that use a coolant.

Rotax-Owner.com

Here a link for AC-65-12A that has some info about air cooling and lubrication;

http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/614bd958f4d610df862569ee0077e5f0/$FILE/Chapter%206.pdf

sorry again i don't wanna be rude by interrupting the forum, i just really don't know how to start a new one, i'll delete my comments as soon as possible..

No worries and no need to delete anything - just want to make sure you get an answer to your questions.

 

[Zipper730]

And yes I know this is a thread that started over 13.5 years ago, and hasn't been responded to for over 8.5, but I remember something about the P-51 being able to do 395 mph @ 25000 feet and I did a search here first before I searched elsewhere and found it.

Anonymous, who presumably left the forum did produce some interesting information

The aircraft in the described configuration has

• Both internal wing-tanks full (2 x 92 gallons) and center-tank filled to 56 gallons (out of a maximum of 85)
• No factoring in for warm-up, take-off, climb, combat, and reserve

From what was stated

• It takes 36 minutes to climb a clean aircraft to 25,000 feet
• For practical reserve for loitering, 25 gallons would be available, and 179 gallons available for cruise

I would assume that clean means no-bombs or drop-tanks, and the traditional 6 x 0.50" (it might sound stupid, but the devil is often in the details). I'm curious about the following

• 36 minutes to simply reach 25000 feet at normal climb speed, or to actually get to 25000 @ 395 mph?
• How much fuel is generally spent taxiing and warming up for interception missions, medium-ranged, and long-ranged escort flights?
• How much fuel would be generally factored in for combat?

 

[mad_max]

1. - 36 minutes to simply reach 25000 feet at normal climb speed, or to actually get to 25000 @ 395 mph?

That's the speed you can expect at 25,000 ft. There's no climb information on that data sheet.

2. - How much fuel is generally spent taxiing and warming up for interception missions, medium-ranged, and long-ranged escort flights?

From the Pilot's manual at 11,000 lbs adding warm-up, T/O and climbing; fuel used to climb to 25,000 ft, would be estimated at 44 gals. and take 18.5 min.
I can't find the Fig. 53 they say to look at for the warm-up and T/O.

Clean means a combat ready aircraft with no bombs or drop tanks. Usually it means no racks for those also.

Hope that helps you.

 

[Zipper730]

That's the speed you can expect at 25,000 ft. There's no climb information on that data sheet.

Understood -- I wonder where he got the 36 minute figure from...

From the Pilot's manual at 11,000 lbs adding warm-up, T/O and climbing; fuel used to climb to 25,000 ft, would be estimated at 44 gals. and take 18.5 min.
I can't find the Fig. 53 they say to look at for the warm-up and T/O.

Okay so that leaves you with 196 gallons at takeoff...

Clean means a combat ready aircraft with no bombs or drop tanks.

Thanks!

 

[mad_max]

Tank/Bomb racks would cost; if I remember right, was said to be around 10-12 mph on the Pony and Jug.

FWIW