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RE: Aircraft range and combat radius

 
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RE: Aircraft range and combat radius - 8/1/2019 1:58:10 AM   
engineer

 

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Joined: 9/8/2006
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Going back to the Navy Departments Bureau of Aeronautics data, they give the PBJ-1J (a late model B-25) an operating range of almost 1700 nm with a reduced bomb load and a 215 gallon bomb-bay tank. So with the 40% fair weather combat radius you get 680 nm combat radius, the magic 17 hexes to Paramushiro.

Again, I'll restate the simulation vs. game caveat. This seems to offer the Allies an opportunity to mount at least nuisance raids that could distract or tie down forces that stock AE doesn't replicate. Historically, they took place and that's enough for the modder who is looking to try and closely replicate what happened. However, how that influences as big and complicated an engine as a full bore AE game another matter.

FYI: I've been looking at the F4F and F6F data and coming up with range reductions vs. stock without drop tanks. So source reference data can be a two edged sword. A big part of that is that range formula that the Navy used presumed a 20 minute combat interval at military power.

(in reply to spence)
Post #: 31
RE: Aircraft range and combat radius - 11/16/2019 9:09:57 AM   
Saturn V

 

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quote:

ORIGINAL: engineer


I've been hoping to find a USAAF equivalent with good primary reference material but haven't been successful for a free source. This outfit sells PDF for about $19 a pop: http://www.flight-manuals.com/index.html

For the above, I would suggest the following two sites:

http://www.wwiiaircraftperformance.org/
https://www.avialogs.com/

The first site has a plethora of actual flight testing reports on many WWII aircraft. If you scroll down to the bottom of the page for a given aircraft, you can also find links to additional related materials. The second site contains the actual pilot flight training, flight operating instruction, erection & maintenance manuals, and more for a wide variety of WWII and later aircraft.


quote:

ORIGINAL: engineer


FYI: I've been looking at the F4F and F6F data and coming up with range reductions vs. stock without drop tanks. So source reference data can be a two edged sword. A big part of that is that range formula that the Navy used presumed a 20 minute combat interval at military power.

From the "Aircraft Characteristics & Performance" and "Standard Aircraft Characteristics" publications I've seen, for its calculations of combat radius the USN generally used the following as standard parameters:

20 minute warm-up; 1 minute take-off; 20 minute rendezvous, climb to 15,000 feet; cruise out at 15,000 feet using engine settings for maximum range; release drop tanks upon entering combat; 20 minutes of combat using military power and war emergency power; and cruise back at 1,500 feet. Also included was a reserve of fuel equal to the amount consumed in 60 minutes of cruising using engine settings for maximum range.

That reserve fuel amount inclusion in the combat radius calculation greatly reduces the non-drop tank radius, since that reserve eats up a much larger share of the starting fuel as compared to when a drop tank is in use. From the ACP for the F6F-3, the combat radius on internal fuel only was 120 nautical miles; with a 150 gallon drop tank, the radius was 335 nm. (Carrying a 1,000 lb bomb in addition to the drop tank reduced the radius only slightly, to 310 nm. The radius while carrying six 5" HVAR and a drop tank was 305 nm.)

The ACP for the F4F-4 lists a combat radius of 105 nm on internal fuel; 245 nm with one 58 gallon drop tank; and 325 nm with two 58 gallon drop tanks.

(in reply to engineer)
Post #: 32
RE: Aircraft range and combat radius - 11/28/2019 6:26:01 PM   
el cid again

 

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Joined: 10/10/2005
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One issue that appears to have eluded this discussion is map distortion. In the North, and in particular in
Alaska, ranges are badly distorted by the map projection used. Indeed, the ranges of aircraft in Alaska often
can be 100% greater than could be flown, point to point. Ranges should be designed on the basis of the map scale,
which does pretty well match the map near the center - where most operations occur.

Possibly the greatest map distortion is in the Indian Ocean area. A special version of the PBY - used as an airliner -
flew from Perth to Columbo. It still holds the airline endurance record (in terms of hours) and was nicknamed
"the flight of the two sunrises" because it was deliberately timed to maximize night flying when nearest to Japanese
occupied territories (e.g. Sumatra, Malaya). Even though a realistic game range for this aircraft does not
permit the historical route, it IS a useful aircraft to have, particularly for the Allies with the vast distances
between their bases. Long range isn't as useful as it might seem in game terms: often the planes don't fly
for several days (possibly due to weather considerations). The game system is a compromise and works best with
things near the averages - not near the extremes.

(in reply to spence)
Post #: 33
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