The BI will reach them with a speed and alt advantage far before they have time to accelerate, and can just start tearing them apart.
This is true with regards to jets like the Horten, the Meteor Mk. 3, and the J21/A21. Those are always the easy targets. They’re not very common in my experience, with most jets I face being airspawning F-84s, F3D, F2H-2, the airspawning Jabo, the SK-60B, F-89B, and the occasional Kikka. Then you have some mandatory B-29s throw into the mix.
By far the most annoying one to fight is the F2H-2, with a boom n zooming 262 or F-89B at altitude right behind.
I think from this position at altitude over the combat area, the BI should conserve its fuel by throttling down to maintain ~300-350 mph, and dive opportunistically on anyone who gets too slow.
The BI is not a boom n zoomer. You’re not gaining anything by resorting to dive tactics in a plane that can’t break 434 mph without compressing. At least not against planes that are faster than you on the deck.
Maximize your opportunities by staying just high enough that the enemies cant reach you without exposing themselves for you to attack, but not so high that you accelerate uncontrollably when diving in and/or they have time to dive/accelerate away.
I’m not sure what this scenario would be. If you have to withhold energy in a dive, it doesn’t matter if you’re 2,5 km away or 5 km away. It depends on whether they’re slow in the first place, and if they’re aware of you as you approach. If they are aware of you, and they’re one of the enemy jets that are difficult to catch, it’s just more effective to bait them in with the false hope of superiority in numbers, and see if they’ll try tag-teaming you with a dogfight.
The BI would suffer from BR compression at 7.0/7.3, but it would still be in a better position than many 7.0 or 7.3 jets.
This is why I argue for BR decompression instead. The performance gap in this BR range is pretty big, especially when you consider the enemies you’ll be up against in an uptier.
Due to being a rocket the BI benefits massively in fuel economy at high altitude, since drag decreases with increasing altitude, but unlike a prop or jet, thrust actually increases. This makes the BI’s physics-defyingly efficient rocket engine even more insane.
The biggest gain is actually the weight reduction once you get below 50 seconds of fuel. It’s preferable to burn away a good chunk of your first minute early game to set yourself up at around 4km alt and cruise around 18-24% on your approach to the enemy. That leaves you with some 30-35 seconds of 100% throttle usage for actual fighting, while you keep about 15 seconds handy for returning to the airfield. Below 5 seconds of fuel, I’ve made it across the map on 3% throttle (very slowly, though).