DCS: AJS-37 Viggen Discussion

[mambo]

Swedish Air Force Viggen pilot interview

 

1. What is your opinion about the Viggen compared to other fighters from the same era? For example the Tornado, F-15 Eagle, Mig-29 and so on.

Well... Not an easy question to answer. The air-to-air combat arena is very complex and involves factors like; how many are you? Distance? Weapons carried by both the opponent and your own group, etc. It’s not as easy as to say that whoever turns best comes out on top. But to give some kind of answer would be that I, having a choice, would not go into a dogfight with the Fighterviggen versus the F-15 or the MiG-29. Tornado Yes. Basically based on rate-of-turn performance. On the other hand I would consider to face both the F-15, MiG-29 and Tornado if I had enough distance at setup, flying with a wingman who knows what he is doing and my sensors gave me good situation awareness.

2. What makes Viggen such a charming fighter, is there more to it then just brute force?

I would say that the looks and the sound of the aircraft make a big part of the charm. But for the pilot there’s more to it than that. The Fighterviggen was an aircraft that you could really rely upon when flying and felt kind of like an extension of your body and mind. Meaning that you could forget about the aircraft itself, and totally focus on your situation and status in the air. I’m talking about the Fighterviggen now. The AJS37 was another deal...

3. Viggen is supposed to be a defensive fighter, not able to engage in close dogfights. How does that affect the way you fly the plane when training dogfights?

Again, it all depends on the opponent and situation. If you as an example met a F-16 with full armament and external fuel tanks while being light yourself, the difference in performance is close to zero. So you always consider status before entering dogfight. If you find the picture not in favour, we train to engage while keeping distance, avoiding dogfight or outnumber the opponent. Basic fighter tactics since forever.

4. You have flown most of the Viggen versions, how do they differ performance wise?

The difference between old recce/attack/EW and the fighter version is tremendous. Let’s break it down to just engine and manoeuvrability to limit the answer some.

The modified RM8B was paramount for the viggen to be effective in air combat. Not so much the extra power, but the carefree handling the modification allowed. You could yank the throttle from idle to full burner and back, while in high AoA, without complaints from the RM8B. It was also stronger, giving better acceleration. Especially at high altitude, going for high supersonic speed with an unlimited engine that we had a few rare examples of. The extra hydraulic cylinder for the rudders combined with the audio warning system allowed for an easy ride at close to supersonic speed at high G with the JA37. You just couldn’t get yourself into trouble. You were effective in that machine.

The recce/attack/EW was another story... To sum it up it is a brutal and fun ride in an old AJS viggen! But man you had to watch what you were doing...

In air-to-air combat the engine, RM8A, was more than likely to end up in engine stall if you even touched the throttle at some high AoA or altitudes. You could not pull more than 6 G and you had no audio warnings while at the same time the alpha meter and G meter were located ridiculously far away from each other in cockpit. You had to be aware of transonic speeds due to the steering system and so on... So, the AJS was less than a good airplane at air-to-air combat.

But if you were one of the rare old dogs who had done nothing more than been flying the AJS viggen for some twenty years, you could use the lower weight of the aircraft to your benefit. The AJS actually accelerated better than the JA at most altitudes and a good pilot could outturn the JA37. The sensitive steering system also makes it my choice in low level flying, where the AJS really excelled. Still, it had no gun... In air-to-air I would pick the JA37 at any time.

5. The RM8B from Volvo Flygmotor is a powerful engine, how sensitive is it? How did you have to treat it once your in the air?

Not sensitive at all in normal flying, as shows partly in previous answer. I know only one guy who had a minor engine stall after passing jet-wash. You had to watch yourself though while flying at extreme high altitudes for the A/C envelope. You could end up in a high temperature stall, which you normally cured by shutting down the engine and restart it a few thousand meters below!

6. Since we all know that Viggen means raw power, why don't you tease us with describing how it feels to travel from cruise speed to when you engage full afterburners?

Well, some sorties I still remember. Especially flying at supersonic speed at low level. We used to fly at 300 meters above the bay of Bothnia at Mach 0.90, and after picking up radar contact with hostiles started to accelerate.

Giving full afterburner at that speed and altitude slams you back in the seat and within a few seconds you have passed the sound barrier, noticed by some pitch oscillation and transonic warning. Now, here is where the big engine really shows off. The acceleration keeps pressing you back while the speed increases. Soon odd things are starting to show. The roar from outside your aircraft is so loud the radio transmissions are almost unreadable even at max volume. You can actually feel the temperature rising in the cockpit from the friction between the aircraft and the air. I once put my hand at the fuselage next to the throttle and could feel the heat! Finally when the aircraft has reached its maximum allowed speed, close to 1500 km/h, the angle of attack is so low that the roll centre of the aircraft has moved up to your head. So when you roll your body swings away underneath you, while the head remains at the same position. It is at this point you can actually believe that the engine is capable of producing some 100000 horsepower!

7. The JA37 version had an automatic cannon, supposed to steer the aircraft for you once its locked on to the target so that every round hit its target. Does it really? And if yes, how much control does the aircraft have during this moment?

It does work. In fact it works extremely well. It often replaced the Sidewinder as weapon of choice because of its 360 degrees capability and explosive force. The aircraft is in control of yaw and pitch. You just make sure to keep the proper roll angle. The aircraft is pretty brutal in its attempts to keep the alignment, so motion sickness was actually a common outcome for some pilots after a sortie!

8. According to several magazines, Viggen could have been updated/modified and carried on for 20 more years. Instead the airforce opted to buy the Gripen. Do you think this is a correct decision and why?

Well, yes I think it is a correct decision. Keep in mind that the potential of the Gripen is better than for the Viggen. The Fighterviggen was at the end a formidable fighting machine with its data-link, AMRAAM capability and integrated jamming systems. But it could not outmanoeuvre a modern light-weight fighter in close combat. And you have to be able to do all these things. The cost to integrate AA-refuelling and a modern even more powerful engine to the Viggen must be huge. Remember that the Viggen is a heavy aircraft, and weight costs money. So... even though I always loved the fighterviggen it is time for the Gripen to carry the legacy of the Viggen into the future!

9. Viggen has its unique thrust reverser but the Gripen lacks such a system. Why do you think they choose to go this way? Which one do you prefer from a pilots point of view?

Actually, the Gripen uses its wheel brakes combined with rudders to create high friction towards the surface. Reason for this is that the reverser-system is very heavy and is seldom used. So, you carry along a lot of weight for little use. On the other hand, you could land a Viggen at short runways on ice and snow conditions. Not too easy with the Gripen, which requires good runway conditions. But then again! We do not use short strips anymore, with our new tasks to be interoperable to NATO /EU, so the answer to what system to prefer would be the system that Gripen has got. It's more weight efficient.

10. In Sweden, during some exercises the air force used our main roads as small bases for refuelling/rearming the Viggen and now Gripen. I have heard that some pilots compare it with carrier landings. Have you ever landed a Viggen on a regular road? If you have, how much harder is it compared to landing on a runway?

To compare it to carrier landing is in my opinion a little exaggerated! After all, the runway is 800 meters and doesn’t move! I have landed on short runways many times, and it is a business that requires some concentration. You need to be fast and precise, because every second you wait with brakes or power the aircraft eats runway. Especially the winter landings were a thrill. To force down 14 tons into a white little strip in 250 km/h seems just... wrong.

11. One thing caused more tragic accidents with the Viggen then any other: The low level flying. To make it clear for our readers, several variables have to meet before any pilot crashes at low altitude. But is it easy as a pilot to loose your bearings in general, or is this common when you fly the Viggen at low altitude?

Low level is a risky business no matter what aircraft you fly. Especially over sea and in winter conditions, where low contrast often is the reason for accidents. The Viggen had extreme low level tactics with the recce and attack versions, so that explains the number of accidents to some extent. But the major reason for low level accidents was the recce/attack-verion's lack of warning systems. You had no audio/visual warning system when you were about to hit the surface. The Fighter version did have such a system, and to my knowledge never had a CFIT. (Controlled Flight Into Terrain)

Remember that the recce/attack Viggen flew at tree top level in up to 4-ship formation at close to supersonic speed. Once again. Risky business.

12. Have you ever had a 'close call' of any kind?

If you fly fighters long enough, sooner or later you will have close calls. It’s part of the job unfortunately. I had my share in both Viggen and other aircraft, but they could have happened in any type of aircraft, so I’m just glad that it was some time ago and hopefully will not happen again in the near future.

13. The new generation fighters can cause some pilots to suffer from 'information overload'. Have you had any experience of this syndrome? How do you think the pilots situation awareness gets affected in the Gripen compared to the Viggen with all this new information to process?

A pilot can only handle a certain amount of information, that is true. You would be surprised how little sometimes!

The big thing with the Gripen is that the aircraft itself is very easy to fly, so you have maybe 90 percent of your capacity to handle the tactical situation! In the Fighterviggen you had 80 percent, in the recce/attack 50 percent while the old 35 Draken pilot had no capacity at all to think about his tactics, while struggling with an aircraft that just loved to be in a superstall!

My own experience is that I had a lot to do sitting in the recce Viggen, just handling the system, while the fighter version was just an immaculate man-machine integration! You were totally focused on the mission, and never worried about the aircraft itself. The Gripen is close to, if not better than the Fighterviggen regarding these matters. But the Viggen has got the looks...

[Stingray87]

What an interesting read! Thank you, Sir! :)

[Guitrz]

Very interesting :)

[Apache600]

Awesome read there mambo. I really liked the description of the speed (point 6)

[RaXha]

Awesome read there mambo. I really liked the description of the speed (point 6)

 

I always had the illusion that things when quieter after passing mach 1, but apparently not! :P

[Goblin]

It was one of the very few times where AJ 37s took off fully armed with

RB 04Es and with pilots aware that hey might very well have to use them.

 

Tensions were indeed high during this incident.

The AJ37:s were armed and towtrucks hooked up. However, they never deployed to their war bases out of fear of alarming the Soviet Union. They didn't even pull the Viggens out of the hangars, the first day, fearing satellites (and spies) would spot them being armed... But all personell slept on the base, essential personell in sleeping bags on the hangar floor.

[Einherjer]

@cobra

The viggen seems to be metric, do you plan to implement a imperial option?

[EasyEB]

Did the AJ(S) ever get the imperial instrument addition? I think the JA got it at some point.

[Goblin]

Since SAAB tried to sell the AJ abroad, I guess they had a Imperial option for external customers. But I don't think it ever flew...

[Einherjer]

DCS: AJS-37 Viggen Discussion

 

Don't know I thought about a gameplay option like in the L-39

 

If I only fly metric planes , then it's not a problem but if I fly multiple modules it can get a little tricky

 

Also flying with other western jets together- constantly calculating high and speed

Edited December 1, 2016 by Einherjer

[Reflected]

Took this picture yesterday in Madrid. I have to admit, it does look bad@ss. And it's HUGE!

[Agremont]

Took this picture yesterday in Madrid. I have to admit, it does look bad@ss. And it's HUGE!

 

Looks very well looked after and shiny!

 

Yeah they're bigger than you think. It's hard to get a sense of scale from photographs.

 

The cockpit is quite roomy too, at least in comparison to the Draken's cockpit.

[QuiGon]

@cobra

The viggen seems to be metric, do you plan to implement a imperial option?

 

There was non for the MiG-21 (pls correct me if I'm wrong), so I don't think there will be one for the Viggen, as it never had one. Sure, in theory export-Viggens probably would have been converted to the imperial system, but that is just a theory. It never happened. So I don't see a reason to implement it, as it would just be an unrealistic game helper. Real Viggen pilots needed to cope with their metric system when they flew together with other air forces. It should be the same for us :)

[Einherjer]

There was non for the MiG-21 (pls correct me if I'm wrong), so I don't think there will be one for the Viggen, as it never had one. Sure, in theory export-Viggens probably would have been converted to the imperial system, but that is just a theory. It never happened. So I don't see a reason to implement it, as it would just be an unrealistic game helper. Real Viggen pilots needed to cope with their metric system when they flew together with other air forces. It should be the same for us :)

 

 

 

L-39 from ED has this option, so thought it would be nice to have here too

[QuiGon]

L-39 from ED has this option, so thought it would be nice to have here too

 

I don't know if there are imperial variants of the L-39 IRL, but there are't any imperial variants of the AJS-37, as it has never been exported unlike the L-39.

And LNS is not ED ;)

[NeilWillis]

A lot of other modules have had mods giving the option of imperial gauges. I have no doubt, regardless of real-world application, that one will appear for the Viggen too.

 

It may just take a while to materialize.

[Goblin]

Looks very well looked after and shiny!

 

It has been repainted, with the wrong colors, and wrong markings. And, no Viggen was ever this shiny, not even straight from the paintshop. It had a very dull sheen.

[Agremont]

It has been repainted, with the wrong colors, and wrong markings. And, no Viggen was ever this shiny, not even straight from the paintshop. It had a very dull sheen.

 

I thought it looked a bit odd.

[Snail]

The AJSH37 in Lelystad (Aviodrome) has this metric-imperial table below the HUD: Viggen pilots also had to do some conversion ;-)

 

Btw, this Viggen also had a repaint in shiny, wrong colors.

 

Edited December 1, 2016 by Snail

[Agremont]

Yeah that doesn't look great.

[drPhibes]

Nice to have when talking to civilian ATC. For military use you just have to remember to fly below 150m, above 30m over land and 20m over sea :P

[QuiGon]

The AJSH37 in Lelystad (Aviodrome) has this metric-imperial table below the HUD: Viggen pilots also had to do some conversion ;-)

 

 

That would be a nice thing to have instead of unrealistic imperial instruments. :)

[Dahlbeck]

Actually, there is a similar table in LNS' Viggen cockpit. :-)

[sydost]

Nice to have when talking to civilian ATC.

 

Don't know how swedes did it but at least in Finland ATC (military and civilian) did the conversions. So military pilots just used whatever units they had on the instruments for speed / altitude or height when communicating with ATC.

[Goblin]

Don't know how swedes did it but at least in Finland ATC (military and civilian) did the conversions. So military pilots just used whatever units they had on the instruments for speed / altitude or height when communicating with ATC.

 

Same in Sweden. But when SwAF went abroad, they had to use feet for altitude.

I'm a civilian instrument rated commercial pilot. I've flown the Viggen simulators at F15 museum (at an abandoned airbase) and at Novelair. It was very hard to get used to the altimeter, showing meters, and having 0 at the 6 o'clock position..! :)