GURPS Traveller: SHip Airspeed Question

gjs777 · 10-29-2020, 04:57 PM

Hello Everybody

This is an obscure question but I hope someone can help me. In GT159 a formula is given for calculating a ship's airspeed. IN GT130-146 various example ships given are with their air speeds - however, if you calculate the speed of the ships according to the formula there is a huge discrepancy - the speeds given are ~ 15-20 x greater than thosederived from the formula!

Is the formula wrong or are the ships' speeds wrong?

Any help would be much appreciated.

Imion · 10-29-2020, 05:52 PM

I wasn't able to reproduce such a margin of error.

Code:

Ship	Total Surface Area	Thrust	Air Speed calculated	Air Speed given
Sulieman	10800	800	2357.022604	2357
Beowulf	16600	640	1700.460604	1700
Empress Marava	16600	600	1646.4639	1646
Animal	15800	440	1445.201576	1445
Rampart	2000	500	4330.127019	4330
Iramda	2000	240	3000	3000
10-ton Launch	2000	40	1224.744871	1225
10-ton-Lifeboat	2000	40	1224.744871	1225
20-ton Gig	3000	160	2000	2000
30-ton Ship's Boat	4000	160	1732.050808	1732
40-ton Fuel Skimmer	5000	440	2569.046516	2569
40-ton Pinnace	5000	640	3098.386677	3098
100-ton Shuttle	10000	1200	3000	3000
100-ton Interplanetary Shuttle	10000	680	2258.317958	2258
50-ton Modular Cutter	6500	480	2353.393622	2353
Dragon	28200	11360	5496.614045	5497
Akkigish	28200	1360	1901.846807	1902

Could you walk us through your calculations?

gjs777 · 10-29-2020, 11:15 PM

I have worked out the problem. I was using the ship's final G rating as the Thrust but instead I should have calculated it the following way: Thrust = Number of Manoeuvre drives x Thrust rating as found in Starships138.

Your worked examples allowed me to solve the problem so thank you for providing those and thank you for your quick response, it is much appreciated.

10-29-2020, 04:57 PM	#1
gjs777 Join Date: Oct 2020	GURPS Traveller: SHip Airspeed Question Hello Everybody This is an obscure question but I hope someone can help me. In GT159 a formula is given for calculating a ship's airspeed. IN GT130-146 various example ships given are with their air speeds - however, if you calculate the speed of the ships according to the formula there is a huge discrepancy - the speeds given are ~ 15-20 x greater than thosederived from the formula! Is the formula wrong or are the ships' speeds wrong? Any help would be much appreciated.

10-29-2020, 11:15 PM	#3
gjs777 Join Date: Oct 2020	Re: GURPS Traveller: SHip Airspeed Question I have worked out the problem. I was using the ship's final G rating as the Thrust but instead I should have calculated it the following way: Thrust = Number of Manoeuvre drives x Thrust rating as found in Starships138. Your worked examples allowed me to solve the problem so thank you for providing those and thank you for your quick response, it is much appreciated.