SM.91
Contents
Description
The SM.91 is a rank II Italian attacker with a battle rating of 3.7 (AB/RB) and 4.0 (SB). It was introduced in Update 1.85 "Supersonic".
General info
Flight performance
The SM.91 fulfils a similar role to the P-38 when flown as an interceptor: a twin-engined fighter that is surprisingly capable as a dogfighter due to its good turn rate, especially when spaded. The twin Piaggio P.XI RC.40 12 cylinder inline engines, which happen to be a pair of the powerful DB 605 Inverted V12 engines, are placed away from the cockpit, meaning its hard to take them out in a head-on. However, the heavy nature of the plane means that its acceleration is quite sluggish at low altitudes. The aircraft also sports leading edge wing slats that shorten the turning circle and has airbrakes that can help it slow down in a dive and help when landing on an airfield, which is already fairly easy due to its tri landing gear.
| Characteristics | Max Speed (km/h at 7,010 m) |
Max altitude (metres) |
Turn time (seconds) |
Rate of climb (metres/second) |
Take-off run (metres) | |||
|---|---|---|---|---|---|---|---|---|
| AB | RB | AB | RB | AB | RB | |||
| Stock | 561 | 546 | 9500 | 21.1 | 21.9 | 9.3 | 9.3 | 300 |
| Upgraded | 610 | 585 | 19.0 | 20.0 | 15.3 | 12.0 | ||
Details
| Features | ||||
|---|---|---|---|---|
| Combat flaps | Take-off flaps | Landing flaps | Air brakes | Arrestor gear |
| ✓ | ✓ | ✓ | ✓ | X |
| Limits | ||||||
|---|---|---|---|---|---|---|
| Wings (km/h) | Gear (km/h) | Flaps (km/h) | Max Static G | |||
| Combat | Take-off | Landing | + | - | ||
| 845 | 300 | 535 | 450 | 260 | ~10 | ~5 |
| Optimal velocities (km/h) | |||
|---|---|---|---|
| Ailerons | Rudder | Elevators | Radiator |
| < 280 | < 200 | < 450 | > 380 |
| Compressor (RB/SB) | ||
|---|---|---|
| Setting 1 | ||
| Optimal altitude | 100% Engine power | WEP Engine power |
| 5,800 m | 1,232 hp | 1,387 hp |
Survivability and armour
The SM.91 has a good survivability, being able to take multiple 12.7 mm hits before going down; however, be careful when the enemy has 20mm cannons or higher since they will cause serious damage to your aircraft fuselage and engines.
One DB 605 Inverted V12 engine is powerful enough to keep the aircraft flying in case of losing the other one, however; use of Manual Engine Controls is vital in this situation. Detailed explanation below.
Modifications and economy
| Flight performance | Survivability | Weaponry | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Armaments
Offensive armament
The SM.91 is armed with:
- 3 x 20 mm MG 151/20 cannons, nose-mounted (300 rpg = 900 total)
- 1 x 20 mm MG 151/20 cannons, chin-mounted (300 rpg)
- 2 x 20 mm MG 151/20 cannons, wing-mounted (300 rpg = 600 total)
The SM.91 has 6 of the powerful MG 151/20's mounted in the centre of the aircraft and can utilise the minengeschoss round. Use "Stealth" or "Air targets" belts for best effectiveness.
Suspended armament
The SM.91 can be outfitted with the following ordnance:
- Without load
- 6 x 50 kg GP 50 bombs (300 kg total)
- 6 x 100 kg GP 100 bombs (600 kg total)
The SM.91 can carry up to 6 x 100 kg bombs, which makes it useable in ground forces battles. Due to the rather small size of the bombs, you have to be extra accurate when dropping bombs.
Defensive armament
The SM.91 is defended by:
- 1 x 20 mm MG 151/20 cannon, dorsal turret (350 rpg)
The SM.91 can defend itself very well from any tailing aircraft. Use "Universal" belts for the most effective defensive fire.
Usage in battles
When flying it as an interceptor, it can shred bombers apart with its powerful armament and can ward off escorts who try to tail it with its single 20 mm cannon. However, it is paramount that you come in from oblique angles when attacking bombers, as their gunners can easily take out your pilot due to your lack of armour and bulletproof glass.
When flying it as a ground attacker, be wary that carrying the max payload will significantly decrease performance and you will be a prime target for low flying fighters like Yak's and Spitfires. However the maximum payload is rather weak, only 6 x 100 kg bombs with a max armour pen value of 91 mm and a blast radius of 4 meters. This means that you must land a near perfect or direct hit on medium and heavy tanks in order to destroy them.
On Simulation Mode
While flying on simulation mode you can take your time to reach a safe altitude around 3500m - 5000m climbing within ally air space. Keep in mind that you should use this aircraft with a Boom and Run mindset, that being the case, you should dive on your target while remaining hidden for your enemy as long as possible. Remember that in order to concentrate your burst mass in one zone, and hence having a greater chance to destroy the enemy plane (module; i.e., wings, tail) in one pass, you should open fire according to the gun targeting distance you are using, being a good setup from 300m to 500m.
With your 6 x 20 mm MG 151/20 cannons you will be able to shoot down almost every enemy aircraft on your gunsight. However, always check the surroundings before attacking, you dont want to get swarmed after engaging with an enemy. You have to remember that most enemy aircrafts, save bombers, are faster and turn better than you. Therefore, you need to choose your targets wisely.
If everything mentioned before goes wrong and you end up with an enemy, or in the worst case, multiple of them going after you, you still have one chance to get out of that situation alive and it is your dorsal turret. The plane is equipped with a 20 mm MG 151/20 cannon and, when used correctly, it can pose a serious threat to most enemy fighters tailing you.
It is recommended to perform evasive maneouvers and wait until the enemy behind you gets in a range of <500m, practically point blank. Therefore you will have an easier time leading your bullets in the enemy direction; when succesfully hitting an enemy at this range it will just take a couple of direct hits to set the bandit on fire, or if you get a good shot at his wings, send him down immediately.
Counter-tactics
Do not head-on this plane, the 6 x 20 mm cannons will most likely destroy your plane and do not underestimate the defensive cannon. Armed with minengeschoß belts, the nose mounted cannons can easily cut your wings or set you on fire.
It is best to attack this plane from below since the deffensive 20 mm MG 151/20 cannon won't be able to aim lower than just a few degrees below the tail. Keep also in mind that even a P-47 can outturn it, so if an SM.91 gets behind you, force him to turn and make it lose energy.
If you are flying an aircraft with decent performance in vertical maneuvers, force the SM.91 to fight on the vertical. Due to the deficient acceleration capacity combined with a bad performance when going vertical, you will most likely get guns on target rather easily with this tactic.
Manual Engine Control
| MEC elements | ||||||
|---|---|---|---|---|---|---|
| Mixer | Pitch | Radiator | Supercharger | Turbocharger | ||
| Oil | Water | Type | ||||
| Not controllable | Controllable Not auto controlled |
Controllable Not auto controlled |
Controllable Not auto controlled |
Separate | Not controllable 1 gear |
Not controllable |
The SM.91 has a very forgivable MEC, therefore don't worry about killing your engine and try differente settings according to the map's conditions.
As a general setting you can: set the water and oil radiator at 30%, it will be a long time before cooling off is needed if using 100% throttle, however if WEP is engaged then you will need to open both radiators up to 45%; propeller pitch set at 100% when climbing and lower it to 85%-90% when going horizontal.
If the engines take damage, it will usually be only one of them. That said, the SM.91 is able to fly with only one of its engines working. However, try to extend its life span or even keep the engine alive until you are back at the airfield to repair.
In order to do this, set the damaged engine (or both, if that's the case) as follows: water and oil radiator at a 100%, propeller pitch at 0% to 30% depending if you really need a boost to, for example, get over a hill; and throttle to 50%.
Pros and cons
Pros:
- Great for Head ons
- 6 x 20 mm MG 151 in the centre of the aircraft
- Main armament has an insane ammo capacity
- Gets an attacker spawn (AB/RB)
- 20 mm MG 151 turret in the back
- Surprisingly good turn rate
- Can act as a powerful interceptor
- Made entirely out of metal, so it can take some punishment.
- Fuel tanks are self-sealing
Cons:
- Tail is prone to snapping when under fire
- No armour protection
- Big target
- Lack of bulletproof glass means pilot is susceptible to getting knocked out, especially in head-ons
- Wings are littered with fuel tanks
- Carrying the largest payload has a noticeable effect on performance
History
In 1942, Regia Aeronautica requested a new, long range aircraft that was to be powered by the German DB 601 Inline Inverted V12, carry an 800 kg bomb load, have 6 x 20 mm main armament and a single 20 mm rear cannon. Savoia-Marchetti had previously worked on the SM.88 heavy fighter and the request for a long range fighter disqualified the 88, as it only had a 1,250 L fuel capacity. SM started to work on a new fighter named the SM.91 that was made entirely out of metal, had 6 x 20 mm MG 151 cannons (7 if you count the rear gunner) provided by Germany, was powered by two DB 605 engines and had a range of 1,600 km with a 1,600 L fuel capacity that could be enlarged to 1,800 L with auxiliary tanks.
The two prototypes that were produced made their maiden flight on the 11th of May, 1943 and logged 27 hours at Vergiate. However, it was never entered into the official trials, mainly due to it still being in testing. The first prototype was captured and sent to Germany, and the second prototype was presumed to have been destroyed by bombers.
Media
Excellent additions to the article would be video guides, screenshots from the game, and photos.
See also
Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:
- reference to the series of the aircraft;
- links to approximate analogues of other nations and research trees.
External links
| Savoia-Marchetti | |
|---|---|
| Bombers | S.M.79 serie 1 · S.M.79 serie 8 · S.M.79 AS · S.M.79 bis/T.M |
| S.81 | |
| Attackers | SM.91 · SM.92 |
| Export | S.M.79 B |
| Captured | ▀S.M.79 serie 1 · ▀S.M.79 serie 4 · ▀S.M.79 serie 8 |
| ▀S.M.79 AS · ▀S.M.79 bis/N · ▀S.M.79 bis/T.M · ▀S.M.79 B | |
| Italy strike aircraft | |
|---|---|
| Ba.65 (K.14) L · Breda 88 (P.XI) · F.C.20 Bis · P.108A serie 2 | |
| Ro.57 Quadriarma · SM.91 · SM.92 | |
| Hungary | ◐Bf 110 G-4 · ◔IL-10 |
| Romania | Hs 129 B-2 (Romania) |
