Are the waypoint speeds TAS.
If so eg B17 cruising at 22,000 at 250mph IAS = 402kph = 579kph waypoint speed.

It's good to understand how IL-2 handles waypoint speeds.

For example, try this test. Set two parallel waypoint paths for two exact (model, fuel, etc.) planes. Make sure the waypoint speeds are the same for both planes.

However, place the waypoint heights of one plane HIGHER than the other. Run the test mission and you will see that the two planes are not traveling at the same speed, although the waypoint speeds are the same.

I guess what I am trying to tell you is that the plane's speed will be determined by the altitude, not the waypoint speed.

To me, it seems like the waypoint speed settings are more like throttle settings, in that you will get different results depending on the altitude of the waypoint.

Aviar

One thing to remember is that waypoint speed settings are determined by the aircraft's performance envelope.

B17 AI don't use super charger stage 2 so cant reach their rated speeds at high altitude.

Waypoint time/speed indicators are an approximation of where the aircraft will be dependant on its environment, payload etc.

IIRC the waypoint speeds are TAS

WP speeds are more like IAS actually, Alpha. When I first tested this it seemed the speed was the IAS at which the AI would try to fly. However, that isn't entirely true either. It's like Aviar said and the actual speed they use depends on... well Oleg might know, but perhaps it is a sort of power setting thing.

I know setting Vals and Kates to the same speed at the same altitude won't make them fly at the same speed. It took a lot of tweaking to get them to stay close enough for the duration of the mission.

FMB treats the speed as a TAS (ground speed strictly speaking) and uses it to calculate ETAs, but a quick test with any aircraft set to fly for 30 mins or so at angels 20 will reveal the FMB ETAs are worthless - save perhaps at low-level.

For most purposes I've found that you can consider the WP speed to be the IAS at which the aircraft will fly. It's generally pretty close - so long as you've set a realistic speed in the first place - even though, as I said, it won't necessarily be exact enough to keep different types in formation.

This amazes me, as I have never had this problem as long as all WPs have the same speed and altitude settings.

quote:

Originally posted by Blindman-:
This amazes me, as I have never had this problem as long as all WPs have the same speed and altitude settings.

Thats right, but as I posted above

quote:

Originally posted by KG26_Alpha:
One thing to remember is that waypoint speed settings are determined by the aircraft's performance envelope.

B17 AI don't use super charger stage 2 so cant reach their rated speeds at high altitude.

Waypoint time/speed indicators are an approximation of where the aircraft will be dependant on its environment, payload etc.

IIRC the waypoint speeds are TAS

I'm trying to say make sure your not putting the aircraft where they are not supposed to be regarding altitude and airspeed with fuel and payloads.