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FCS disengage safe airspeed?


jackmckay

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400 kph iirc

 

 

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AWAITING ED NEW DAMAGE MODEL IMPLEMENTATION FOR WW2 BIRDS

 

Fat T is above, thin T is below. Long T is faster, Short T is slower. Open triangle is AWACS, closed triangle is your own sensors. Double dash is friendly, Single dash is enemy. Circle is friendly. Strobe is jammer. Strobe to dash is under 35 km. HDD is 7 times range key. Radar to 160 km, IRST to 10 km. Stay low, but never slow.

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Dear ED.

 

What is maximum safe IAS for FCS disengagement levels 1 and 2 without wing structural failures on max AoA. How Su27 wing accumulates structural damage and at what IAS and AoA?

 

Thank you.

 

Stage 1 & 2 of the ACS aren't modelled in the DCS Su-27, it's either in full automatic or full direct mode. IIRC as Wild Bill said the maximum disengagement speed is 400 Km/h, though I'd be very careful disengaging it at anything over about 350.

System Spec: Cooler Master Cosmos C700P Black Edition case. | AMD 5950X CPU | MSI RTX-3090 GPU | 32GB HyperX Predator PC4000 RAM | | TM Warthog stick & throttle | TrackIR 5 | Samsung 980 Pro NVMe 4 SSD 1TB (boot) | Samsung 870 QVO SSD 4TB (games) | Windows 10 Pro 64-bit.

 

Personal wish list: DCS: Su-27SM & DCS: Avro Vulcan.

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That means that DCS safe "Cobra" can only be done below 400km/h?

- Question: At what fuel fraction and 2xR73 configuration Su27 have P/W ratio over 1?

 

Not sure what the maximum safe speed is, but I've never tried it above 400 Km/h.

 

As for the T:W ratio:

 

Su-27 empty weight = 16,380Kg

Weight of R73 = 105 so 2 = 210Kg

AL-31F thrust = 7,575Kg dry, 12,500Kg full reheat.

2 engine thrust: 15,160Kg dry, 25,000Kg full reheat.

Empty weight + 2 x R-73 = 16,590Kg

 

So, at 100% RPM with no afterburner your T:W ratio will never be above 1:1. With full afterburner your T:W will be 1:1 at 89% fuel load, with only 2 x R-73 missiles loaded.

System Spec: Cooler Master Cosmos C700P Black Edition case. | AMD 5950X CPU | MSI RTX-3090 GPU | 32GB HyperX Predator PC4000 RAM | | TM Warthog stick & throttle | TrackIR 5 | Samsung 980 Pro NVMe 4 SSD 1TB (boot) | Samsung 870 QVO SSD 4TB (games) | Windows 10 Pro 64-bit.

 

Personal wish list: DCS: Su-27SM & DCS: Avro Vulcan.

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As for the T:W ratio:

 

Su-27 empty weight = 16,380Kg

Weight of R73 = 105 so 2 = 210Kg

AL-31F thrust = 7,575Kg dry, 12,500Kg full reheat.

2 engine thrust: 15,160Kg dry, 25,000Kg full reheat.

Empty weight + 2 x R-73 = 16,590Kg

 

So, at 100% RPM with no afterburner your T:W ratio will never be above 1:1. With full afterburner your T:W will be 1:1 at 89% fuel load, with only 2 x R-73 missiles loaded.

 

Its on wiki

https://en.m.wikipedia.org/wiki/Sukhoi_Su-27#Specifications_.28Su-27SK.29

 

56% internal fuel

AWAITING ED NEW DAMAGE MODEL IMPLEMENTATION FOR WW2 BIRDS

 

Fat T is above, thin T is below. Long T is faster, Short T is slower. Open triangle is AWACS, closed triangle is your own sensors. Double dash is friendly, Single dash is enemy. Circle is friendly. Strobe is jammer. Strobe to dash is under 35 km. HDD is 7 times range key. Radar to 160 km, IRST to 10 km. Stay low, but never slow.

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