Self-only Jump Engines ?

[Lure (OP)]

Hi everyone,

I need some explanations about how jump engine work, especially self-only jump engines.

As the ship's size is used for the calculations of standart transit, why do you use a bigger self-jump engine on your ship ?
As far as i have played, i see no difference between a 1HS self-jump engine and a 15 HS self-jump engine, as the mass of the ship increased proportionally. 

Thanks.

[swarm_sadist]

Besides a 15 HS JD would be fitted to a 15x larger ship? The jump drive only takes a % of the ship mass, which allows for a % for weapons, engines and fuel. Larger ships will still have the same % for jump drives, but will have more overall mass available for other things as well.

A self-only jump drive is a game mechanic to prevent a small gunboat from being able to jump multiple other gunboats, and to put a limit on squadron jump drives in early game. With better tech, a smaller ship could house a squadron jump drive as opposed to a self-only one, which is usually what you want. The only time you make a jump drive so small that it is self-only is when you really want a small ship to be jump capable without assistance.

[MarcAFK]

I should clarify something, jump engines have a rating which is the maximum weight of ship that engine can jump, your 15 HS engine presumably can jump a ship 15 times the size.

[swarm_sadist]

I should clarify something, jump engines have a rating which is the maximum weight of ship that engine can jump, your 15 HS engine presumably can jump a ship 15 times the size.

I was thinking a 15 HS Jump Drive in comparison to a 1 HS Jump Drive, but clarification always helps when the responder takes ~6 hours to respond to questions. The internet is not the best place to understand someone else.

[Lure (OP)]

For example this ship is jump-able for a standart transit jump :

Prince of Wales MkI class Cruiser    10 000 tons     239 Crew     1644. 82 BP      TCS 200  TH 225  EM 0
2250 km/s    JR 1-50     Armour 5-41     Shields 0-0     Sensors 20/20/0/0     Damage Control Rating 18     PPV 29. 42
Maint Life 3. 51 Years     MSP 822    AFR 100%    IFR 1. 4%    1YR 102    5YR 1537    Max Repair 337. 5 MSP
Intended Deployment Time: 26 months    Spare Berths 0   
Magazine 314   

J200(1-50) Military Jump Drive     Max Ship Size 200 tons    Distance 50k km     Squadron Size 1
450 EP Ion Drive (1)    Power 450    Fuel Use 85. 6%    Signature 225    Exp 12%
Fuel Capacity 2 000 000 Litres    Range 42. 1 billion km   (216 days at full power)

Twin Gauss Cannon R2-100 Turret (1x4)    Range 20 000km     TS: 12000 km/s     Power 0-0     RM 2    ROF 5        1 1 0 0 0 0 0 0 0 0
Fire Control S04 48-12000 H70 (1)    Max Range: 96 000 km   TS: 12000 km/s     90 79 69 58 48 38 27 17 6 0

Size 3 Missile Launcher RoF30 (4)    Missile Size 3    Rate of Fire 30
Size 1 Missile Launcher RoF10 (2)    Missile Size 1    Rate of Fire 10
Missile Fire Control FC54-R50 (70%) (1)     Range 54. 3m km    Resolution 50
Missile Fire Control FC4-R1 (70%) (1)     Range 4. 6m km    Resolution 1
Whasp MkII (80)  Speed: 28 000 km/s   End: 29. 3m    Range: 49. 3m km   WH: 4    Size: 3    TH: 205/123/61
Mosquito MkIII (74)  Speed: 30 800 km/s   End: 1. 3m    Range: 2. 5m km   WH: 1    Size: 1    TH: 267/160/80

Active Search Sensor MR54-R50 (70%) (1)     GPS 4800     Range 54. 3m km    Resolution 50
Active Search Sensor MR4-R1 (70%) (1)     GPS 52     Range 4. 2m km    MCR 453k km    Resolution 1
Thermal Sensor TH2. 5-20 (70%) (1)     Sensitivity 20     Detect Sig Strength 1000:  20m km
EM Detection Sensor EM2. 5-20 (70%) (1)     Sensitivity 20     Detect Sig Strength 1000:  20m km

ECCM-1 (1)         ECM 10

Missile to hit chances are vs targets moving at 3000 km/s, 5000 km/s and 10,000 km/s

This design is classed as a Military Vessel for maintenance purposes

I was thinking that the "Max Ship Size 200 tons" was for squadron escort jump, but the total size of the ship + the size of the engine was used for self-jump.

[Erik L]

For example this ship is jump-able for a standart transit jump :

I was thinking that the "Max Ship Size 200 tons" was for squadron escort jump, but the total size of the ship + the size of the engine was used for self-jump.

That ship shouldn't be able to jump at all. Unless I'm misremembering the self only engines. If it does, I'd suspect a bug.

[Beersatron]

You need to use the "Squadron" jump command, that will give you a message saying that the installed jump drive is too small. "Standard" jumps are for jump gates.

[MarcAFK]

Aha, the jump drive bug is still alive it seems.

[Lure (OP)]

I do futher testing and it probably doesn't work as intended.

In my first question, i was thinking that "max ship size" of jump engine was used for escort squadron calculation, so i wondered why enhance that number on a self-jump-engine that doesn't allow squadron jump.

The ship i had posted in example can effectively jump, but i haven't seen the error message in ship windows design telling that the jump engine is too small.

Question moved to bug report ?

[83athom]

This is a big bug. Please don't continue to use this as this is not what is supposed to happen.

[MarcAFK]

Haha, I had 50 ton fighter jump engines on my 40 million ton harvesters back when it worked ages ago....