Tomark SD-4 Viper Attack Model Guide
Tomark SD-4 Viper Attack · Model Guide
Overview
The Tomark SD-4 Viper Attack is a single-engine piston light aircraft from Tomark of Prešov, Slovakia. The source flight manuals cover the Viper SD-4 RTC, approved under CS-LSA (EASA.A.606). It has a 100 hp Rotax 912-series engine, a three-blade ground-adjustable Neuform propeller and a 600 kg maximum takeoff weight. It is built for sporting and recreational flying, day VFR only.
- Maximum takeoff weight is 600 kg. Baggage is capped at 15 kg total (7.5 kg per compartment), and minimum crew weight is 55 kg.
- Day VFR only: no IMC, icing, aerobatics or intentional spins. Never-exceed speed is 126 KIAS.
- Rotax 912 S/ULS-series engine, 100 hp takeoff power, 90 litres usable fuel. Approved fuels include MOGAS (min. RON 95) and AVGAS 100 LL.
- The two manual revisions give different maximum empty weights (410 kg and 405 kg). Check which revision matches the aircraft.
Summary written by AI from the source document. Check the original before relying on it. See which parts of Sprinkle are written by AI.
Reference only, not for flight. Use the current approved manual for your aircraft. See terms, section 5.
Document
Source
Copy found at sprinkle.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type ·
- Model Guide
- Year ·
- 2026
- File size ·
- 50 KB
- Copy found at ·
- sprinkle.com
Specifications & performance
Extracted from this document.
Specifications
- Engine power (hp) ·
- 100
- Baggage volume dm3 ·
- 40
- Fuel usable litres ·
- 90
- Wing loading kg m2 ·
- 57.4
- Oil capacity litres ·
- 3.5
- Propeller diameter m ·
- 1.65
- Max continuous power (hp) ·
- 90
- Fuel capacity total litres ·
- 100
Performance
- Max negative g ·
- -2
- Max positive g ·
- 4
- Max tailwind (kt) ·
- 5
- Max crosswind (kt) ·
- 15
V-speeds
- VA_KTS ·
- 88
- VC_KTS ·
- 102
- VFE_KTS ·
- 79
- VNE_KTS ·
- 126
- VS_CLEAN_KTS ·
- 49
- STALL_FLAPS_II_KTS ·
- 43
Weight & balance
- Cg aft pct mac ·
- 32
- Cg forward pct mac ·
- 24
- Min crew weight kg ·
- 55
- Max baggage weight kg ·
- 15
- Max landing weight kg ·
- 600
- Max takeoff weight kg ·
- 600
Can the Tomark SD-4 Viper Attack fly at night or in cloud?
No. The Tomark SD-4 Viper Attack manuals (RTC model) limit it to day VFR in VMC. Flight into IMC and icing is prohibited. The registry lists a Night-VFR variant, so check that variant's own documents.
What fuel does the Tomark SD-4 Viper Attack use?
The Tomark SD-4 Viper Attack manuals list MOGAS (EN 228 Super or Super Plus, min. RON 95), unleaded AVGAS UL91 and AVGAS 100 LL. Total capacity is 100 litres, of which 90 are usable.
Is the Tomark SD-4 Viper Attack approved for aerobatics?
No. The Tomark SD-4 Viper Attack is non-aerobatic, and aerobatics and intentional spins are strictly forbidden. Normal-operation load limits are +4 g and -2 g, reduced to +2 g and 0 g with flaps out.
What is the Tomark SD-4 Viper Attack Model Guide?
The Tomark SD-4 Viper Attack Model Guide is a model guide for the Tomark SD-4 Viper Attack, dated 2026.
What year was the Tomark SD-4 Viper Attack Model Guide published?
The Tomark SD-4 Viper Attack Model Guide — the Tomark SD-4 Viper Attack model guide on file — is dated 2026.
Common. More common than 79% of the aircraft models we track.
Most owners only have the POH. Here's the essential set for the Tomark SD-4 Viper Attack.
- Pilot's Operating Handbook / AFM
- Checklist
- Maintenance Manual
- Parts Catalog (IPC)
- Systems & Wiring
- Service Bulletins on file
- Type Certificate (TCDS)
Tomark SD-4 Viper Attack for sale now
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In this document
Engine, fuel and oil
One BRP-Powertrain Rotax 912 S/ULS (later manual: 912 S2/ULS2): four cylinders, geared 2.43:1, 100 hp (73.5 kW) takeoff power and 90 hp maximum continuous. Engine speed above 5 500 RPM is limited to 5 minutes. Total fuel is 100 litres, 90 usable. Oil is 3.5 litres total, and AeroShell Sport Plus 4 is recommended.
Weights and loading
Maximum takeoff and landing weight are both 600 kg. Typical empty weight is 369 kg in the earlier manual (maximum 410 kg) and 378.6 kg in the later one (maximum 405 kg). Each baggage compartment holds 7.5 kg and has a volume of 40 dm3. The CG range is 24 to 32 %MAC. Wing loading is 57.4 kg/m2.
What to check before buying
Confirm the AFM revision and serial number match the aircraft. The later manual's cover shows S/N 30790, but its applicability page names S/N 29019. Check that the exhaust silencer, landing light and dual trim changes are documented. Confirm the ballistic parachute, Dynon SkyView avionics, transponder and ELT are installed and working. The registry also lists a Night-VFR variant, so confirm which variant you are buying.
Summary written by AI from the source document. Check the original before relying on it. See which parts of Sprinkle are written by AI.
Safety notes
- Flap position III (40 deg) is for emergency and precautionary short-field landings only. Full trimmability is not possible at that setting.
- Starter use is limited to 10 seconds, followed by at least 2 minutes of cooling. Outside air temperature limits are +40 °C maximum and -15 °C minimum (at ground).
- Crosswind is demonstrated to 15 kts and tailwind to 5 kts for takeoff and landing. The ballistic parachute is rated for use up to 170 kts.
Summary written by AI from the source document. Check the original before relying on it. See which parts of Sprinkle are written by AI.
Full document text
Tomark SD-4 Viper Attack Model Guide The Tomark SD-4 Viper Attack is a single-engine piston light aircraft from Tomark of Prešov, Slovakia. The source flight manuals cover the Viper SD-4 RTC, approved under CS-LSA (EASA.A.606). It has a 100 hp Rotax 912-series engine, a three-blade ground-adjustable Neuform propeller and a 600 kg maximum takeoff weight. It is built for sporting and recreational flying, day VFR only. • Maximum takeoff weight is 600 kg. Baggage is capped at 15 kg total (7.5 kg per compartment), and minimum crew weight is 55 kg. • Day VFR only: no IMC, icing, aerobatics or intentional spins. Never-exceed speed is 126 KIAS. • Rotax 912 S/ULS-series engine, 100 hp takeoff power, 90 litres usable fuel. Approved fuels include MOGAS (min. RON 95) and AVGAS 100 LL. • The two manual revisions give different maximum empty weights (410 kg and 405 kg). Check which revision matches the aircraft. Engine, fuel and oil One BRP-Powertrain Rotax 912 S/ULS (later manual: 912 S2/ULS2): four cylinders, geared 2.43:1, 100 hp (73.5 kW) takeoff power and 90 hp maximum continuous. Engine speed above 5 500 RPM is limited to 5 minutes. Total fuel is 100 litres, 90 usable. Oil is 3.5 litres total, and AeroShell Sport Plus 4 is recommended. Weights and loading Maximum takeoff and landing weight are both 600 kg. Typical empty weight is 369 kg in the earlier manual (maximum 410 kg) and 378.6 kg in the later one (maximum 405 kg). Each baggage compartment holds 7.5 kg and has a volume of 40 dm3. The CG range is 24 to 32 %MAC. Wing loading is 57.4 kg/m2. What to check before buying Confirm the AFM revision and serial number match the aircraft. The later manual's cover shows S/N 30790, but its applicability page names S/N 29019. Check that the exhaust silencer, landing light and dual trim changes are documented. Confirm the ballistic parachute, Dynon SkyView avionics, transponder and ELT are installed and working. The registry also lists a Night-VFR variant, so confirm which variant you are buying. Safety notes: • Flap position III (40 deg) is for emergency and precautionary short-field landings only. Full trimmability is not possible at that setting. • Starter use is limited to 10 seconds, followed by at least 2 minutes of cooling. Outside air temperature limits are +40 °C maximum and -15 °C minimum (at ground). • Crosswind is demonstrated to 15 kts and tailwind to 5 kts for takeoff and landing. The ballistic parachute is rated for use up to 170 kts.