Re: DT-III aboard USS America
Posted: 23 Nov 2016, 19:26
sferrin wrote:spazsinbad wrote:Sadly the F-35B has been bashed with that 1,700 degree undefined 'wotisit' quote since 2010. I suspect but cannot prove it is the afterburner exhaust temperature for the A/C variants.
Unless that's °C I'd be surprised if it was that low. The F110-129 is around 2000°F with the F100-229 being 3200°F. Seems unlikely that the F135 would have cooler exhaust than the -229. (See attached doc. pages 49 & 51).
sferrin wrote:Well in the case I was commenting on you'd be looking for exhaust temps. on the pages I mentioned. They'd show the figures I gave. And since it was in response to a comment regarding full afterburner temps were talking apples and oranges.
Here is the attachment (again): R11 Segment 11.pdf
I found pp.49-51 of the attachment and created the following JPG of Military thrust exhaust temperatues below for comparison.
Exhaust temperatures immediately behind the engine:
- F110-GE-100/129 - 900°F Mil (2000°F A/B)
- F100-PW-200/220 - 800°FMil (3000°F A/B)
- F100-PW-229 - 1000°FMil (3200°F A/B)
Again, with a stated reduction in exhaust temperature of around 300°F due to low-pressure turbine power extraction for liftfan operation, and with a bypass ratio stated as 0.57, it seems reasonable that the exhaust temperature of the F-135 in full military thrust is on the order of 800°F, so in STOVL mode, the main engine exhaust is around 500°F which is consistent with the video spaz posted and which I re-referenced.
I included the exhaust temperatures of the F-16 engines in full reheat above because that seems to be what "sferrin" is referring, but I don't understand the relevance of discussing A/B temperatures since the F-135 does not operate with reheat in STOVL (mode four) operation.