what is more efficient?> tail sitting VTOL like xbat > horizontal VTOL like f35/harriertail sitting VTOL looks like it uses more fuel (idk why just assuming) but it saves weight by only having 1 nozzle
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>F-35B VTO MTOW 41,000lb>F-35B STO MTOW 60,000lbThat should answer your question. It's a lot more efficient to get aerodynamic lift than pure thrust.
>>64493147interesting stats, but im more curious about vertical (horizontal) vs vertical (tail)
>>64493021tail sitters simply bc less weight and complexity, also thrust and intake are better aligned. A helicopter is 100 times more efficient hovering though...
>>64493648harrier or f35 have a ton of components to redirect thrust down. This is heavy and requires a lot of maintenance. A tail sitter has traditionally been too hard to fly. That's why they didn't do it in the 60s
>>64493797that makes sense >>64493794true desu RATO seems like the way to go since everything is unmanned now
>>64493021>>64493797I would guess tail sitters are probably more efficient based on this chart. Probably similar to tilt-wing?The F-35 uses both a lift fan and direct thrust so it's presumably somewhere in the middle of those two.
>>64493874but wouldnt a jet and a lift fan have more disk area than one single disk in a tail sitter?
>>64493916no, not even close. Tail sitters need pretty big props for a given weight, see >>64493797
>>64493931He mentioned the xbat, not the vbat.The F100 of the xbat is a low BPR TF.
>>64493797>>64493931are counter rotating props considered one disk or two disks?
>>64493974sorry just googled, AI says its 2
>>64493988counter rotating props count as 1 disk because the second propeller is not interacting with static air.>>64493916Comparing specific designs may yield an answer one way or another, but a tail sitter can probably extend its disk area by simpler means.
>>64494246how can you extend your disk?
>>64493021The F-35/Yak-whatever method of running a ducted fan via turboshaft is more efficient. At hover speeds you need to move a large volume of air with a very large intake because you do not have forward speed to increase intake pressure/mass flow.Also tailsitters can't STOL. STOL is better than hovering because you can get some lift assistance from the wings and flaps.
>>64494285Make the engine bigger or run a shaft from the engine into a large propeller or something.
>>64494360but then how is that simpler than the f35?
>>64494364You don't have to redirect thrust.
>>64494297All Yaks used lifter jets. The MDD/N pre-JSF VTOL too. That configuration has a thermal problem but it's more efficient weight-wise.
>>64494381I get what you mean but im trying to picture this and keep imagining a thick asf bulbous looking plane. on the other hand the sideways lift fan in the f35 keeps the body streamlined
>>64493874it's just for take off and landing. Probably doesn't have to be very efficient
