View Full Version : Evil BI-1

12-05-2004, 07:00 PM
This plane is evil! At very high speeds the thing stats to angle down and cannot be recovered. Can this be fixed?

12-05-2004, 07:05 PM
"There were seven flights by March 1943 on the second and third airplanes. In those flights the maximum parameters were reached for the interceptor: max altitude - 4000 m, max speed - 675 km/h, max climbing speed - 82m/s, time of flight - 6 minutes 22 seconds, time of engine's work - 84 seconds. In the seventh flight on March 27th, 1943, the pilot tried to reach the speed over 800 km/h on the altitude 2000 meters. But after the engine was shutdown (on the 78th second of flight), the plane began diving and crashed. The test pilot Bakhchivandzhi perished. The commission, which examined the causes of accident decided, that the course of that was the phenomena of the uncontrolled diving, that appeared during the flight near the sound barrier. "

12-05-2004, 07:17 PM
as soon as the nose starts tipping down, roll inverted and your dive will turn into a climb...

12-05-2004, 07:41 PM
The phenomenom is called "Mach Tuck," and its caused by the aerodynamic center of the wing shifting aft when the wing is in transonic flight.

In game, this is modeled correctly, and shows how unknown the concepts of transonic and supersonic flight were to aircraft designers in the early 40s.

This is related to the effects known as "compressiblity" at the time, but propeller-powered planes were unable to accelerate far enough into the transonic range to see this effect in level flight. The rocket-powered BI-1 doesn't have that limitation.

The best way to deal with the Mach tuck of the BI-1 is to determine what speed the phenomenom begins to occur at, and consider that speed the absolute speed limit for the plane. Cycle the engine fully on and off for the best results at maintaining speed in the BI-1.

12-05-2004, 08:41 PM

12-06-2004, 12:03 AM
Ya, keep to 700km/hr max or below and no problem. If too fast, climb a bit. Altitude is always friendly. Like the engine cut~out on some early planes, this nose down Feature adds to the Challenge. Even more challenge is the low ammo, about 4 seconds of trigger time. http://forums.ubi.com/groupee_common/emoticons/icon_frown.gif Also, Bi~1 and J8A are the only FB planes that have winter map skis -- retractable skis in the case of BI~1.

12-06-2004, 02:47 AM
Well, I haven't tried this in the BI-1, but in the He-162, try climbing up to around 6000m, and then flooring the throttle (careful not to light up yer engine, hehe), and you will eventually get to transonic speeds.

As your nose begins to dip, and you begin to dive, do nothing but keep your aircraft straight. You will do a perfect inverted loop!! It's great fun!! Just make sure you have enough height before you do it.